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NSYSU
1.
Chen, Ting-Yu.
Defect Chemistry and Microstructure of SrTiO3.
Degree: Master, Materials and Optoelectronic Science, 2010, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806110-143433 
► Abstract SrTiO3 is cubic at room temperature, and retains cubic until the phase transition to tetragonal at 105K (-168 °C). It is a wide-band-gap semiconductor…
(more)
▼ Abstract SrTiO3 is cubic at room temperature, and retains cubic until the phase transition to tetragonal at 105K (-168 °C). It is a wide-band-gap semiconductor having an energy gap Eg ≈ 3.0 eV, when its semiconductivity is greatly improved by doping with donor oxides, e.g.Nb2O5 or heat treatment in low oxygen partial pressures (Po2). Donor oxides in solid solution with SrTiO3 forming substitutional defects create electron or cation vacancies as the principal charge compensation defect. In-gap levels are also modified by the oxygen partial pressure (Po2) adopted in sintering, which generates oxygen vacancies in order to maintain the overall charge neutrality in the ceramic. In this research, donor-doping and Po2 used in sintering are investigated for the in-gap-level modification using the cathodoluminescence (CL) spectrometry equipped with a scanning electron microscope (SEM). Other analytical techniques, e.g. transmission electron microscopy (TEM) will be used for characterizing the defect structure. Preliminary results suggest that the in-gap levels are registered at 3.10 eV and 2.69 eV, representing the intrinsic Eg and a donor-level created by oxygen vacancies, respectively.
Advisors/Committee Members: Wei-Lin Wang (chair), Hong-Yang Lu (committee member), Bing-Hwai Hwang (chair).
Subjects/Keywords: Nb2O5; TEM; SEM; XRD; SrTiO3
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APA (6th Edition):
Chen, T. (2010). Defect Chemistry and Microstructure of SrTiO3. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806110-143433
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Ting-Yu. “Defect Chemistry and Microstructure of SrTiO3.” 2010. Thesis, NSYSU. Accessed February 26, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806110-143433.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Ting-Yu. “Defect Chemistry and Microstructure of SrTiO3.” 2010. Web. 26 Feb 2021.
Vancouver:
Chen T. Defect Chemistry and Microstructure of SrTiO3. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Feb 26].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806110-143433.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen T. Defect Chemistry and Microstructure of SrTiO3. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0806110-143433
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
2.
Lee, Yu-Ju.
The physical properties of chromium-doped indium oxide thin films.
Degree: Master, Physics, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-144754
► Diluted magnetic oxides (DMO) are one of the new materials for the new generation spintronic devices. In2O3 series materials are the most used one in…
(more)
▼ Diluted magnetic oxides (DMO) are one of the new materials for the new generation spintronic devices. In2O3 series materials are the most used one in transparent conducting devices and can be stabilized in amorphous, nano-crystalline and single crystalline, have great potential application in the future. However, comparison with other DMOs, such as ZnO and GaMnAs, research in In2O3 DMO is rare. This study aims at the physical properties of the pure In2O3 and ITO by doping of Co.
It is found that films grown on Si substrates exhibit poor crystalline structure than those on Al2O3, such that has weaker ferromagnetic coupling. A clear resistance transition at high temperature is observed while only a simple semiconducting like resistance curve, as expectation, is found for films grown on Al2O3. For Cr doped In2O3 samples, ferromagnetic coupling is proportional to Cr dopants. However, the mechanism for this coupling is still unknown. For Cr doped ITO samples, due to the degenerate conduction band, the magnetic moment of Cr is highly possible mediated by RKKY mechanism. This study has discovered a few properties of In2O3 series diluted magnetic oxides. Because of these materials exhibits high stability in film growth and to environment, their future application can be realized if more research can be employed.
Advisors/Committee Members: Shih-Jye Sun (chair), Chun-Yu Hsu (chair), Hsiung Chou (committee member).
Subjects/Keywords: spin; RKKY; CIO; XRD; ITO
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APA (6th Edition):
Lee, Y. (2013). The physical properties of chromium-doped indium oxide thin films. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-144754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lee, Yu-Ju. “The physical properties of chromium-doped indium oxide thin films.” 2013. Thesis, NSYSU. Accessed February 26, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-144754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lee, Yu-Ju. “The physical properties of chromium-doped indium oxide thin films.” 2013. Web. 26 Feb 2021.
Vancouver:
Lee Y. The physical properties of chromium-doped indium oxide thin films. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Feb 26].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-144754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lee Y. The physical properties of chromium-doped indium oxide thin films. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-144754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
UCLA
3.
Wong, Christine Megan.
Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire.
Degree: Materials Science and Engineering, 2017, UCLA
URL: http://www.escholarship.org/uc/item/5rr1307x
► Exfoliation is a technique used to remove a thin, uniform layer of material from the bulk that involves the annealing of hydrogen ion-implanted materials in…
(more)
▼ Exfoliation is a technique used to remove a thin, uniform layer of material from the bulk that involves the annealing of hydrogen ion-implanted materials in order to initiate defect nucleation and growth leading to guided crack propagation. This study presents an investigation into the annealing process required to initiate blistering (an essential precursor to exfoliation) in (0001) sapphire implanted at room temperature with hydrogen ions.Triple axis x-ray diffraction was used to characterize the evolution of the implanted layer for single crystal (0001) sapphire substrates implanted at room temperature at 360 keV with either a 5x1016 cm-2 or 8x1016 cm-2 dose of hydrogen ions. A simulation of the ion distribution in TRIM estimated that the projected range and thickness of the implanted layer for both doses was approximately 2.2 �m. Following implantation, the implanted sapphire was annealed using a two-step annealing procedure. The first step was performed at a lower temperature, ideally to nucleate and coarsen defects. Temperatures investigated ranged from 550 – 650 �C. The second step was performed at a higher temperature (800 �C) to induce further defect coarsening and surface blistering. After all annealing steps, triple axis ω/2θ and ω scans were taken to observe any changes in the diffraction profile – namely, any reduction in the amplitude and shift in the location of the fringes associated with strain in the crystal – which would correlate with defect growth and nucleation. It was found that significant strain fringe reduction first occurred after annealing at 650 �C for 8 hours for both doses; however, it was not clear whether or not this strain reduction was due primarily to hydrogen diffusion or to recovery of other defects induced during the ion implantation. The ω/2θ curves were then fit using Bede RADS in order to quantify the strain within the crystal and confirm the reduction of the strained layer within the crystal. Finally, Nomarski optical images of the sample surfaces were taken after each step to observe any visual changes or blistering that might have occurred. These optical images showed that the strain reduction observed using XRD did not correlate to blistering, as no blisters were observed in any of the optical images. Experimental results showed that at temperatures below 650 �C, no significant strain reduction occurs in hydrogen ion implanted (0001) sapphire. It has also been determined that for (0001) sapphire implanted at room temperature, it was not possible to produce surface blistering after a two-step annealing process at 650 �C and 800 �C, although significant strain reduction did occur, and ω scans showed peak broadening with subsequent annealing, indicating increasing mosaicity and potential defect nucleation. This was in contrast to previous findings that asserted that for sapphire annealed at 650 �C, surface blistering was observable.[7] As previous findings were based on sapphire implanted at elevated temperatures, this may imply that the sapphire substrate…
Subjects/Keywords: Materials Science; exfoliation; sapphire; xrd
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APA (6th Edition):
Wong, C. M. (2017). Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/5rr1307x
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wong, Christine Megan. “Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire.” 2017. Thesis, UCLA. Accessed February 26, 2021.
http://www.escholarship.org/uc/item/5rr1307x.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wong, Christine Megan. “Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire.” 2017. Web. 26 Feb 2021.
Vancouver:
Wong CM. Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire. [Internet] [Thesis]. UCLA; 2017. [cited 2021 Feb 26].
Available from: http://www.escholarship.org/uc/item/5rr1307x.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wong CM. Strain Evolution of Annealed Hydrogen-Implanted (0001) Sapphire. [Thesis]. UCLA; 2017. Available from: http://www.escholarship.org/uc/item/5rr1307x
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
UCLA
4.
Zhang, Teng.
Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure.
Degree: Materials Science and Engineering, 2018, UCLA
URL: http://www.escholarship.org/uc/item/68r3b1ww
► AlGaN/GaN heterostructure is one of the most important materials in applications like High Electron Mobility Transistors (HEMT) and other high speed high power devices. Harsh…
(more)
▼ AlGaN/GaN heterostructure is one of the most important materials in applications like High Electron Mobility Transistors (HEMT) and other high speed high power devices. Harsh environment is often encountered for these devices so the thermal stability of the AlGaN/GaN heterostructure is essential. Despite large efforts spent in the last decades, the reliability of GaN HEMT and GaN related devices still represent an issue. The role of high temperature in the degradation of AlGaN/GaN heterostructure is controversial and multiple process occur simultaneously upon thermal activation. This work presents a study of thermal stability of AlGaN/GaN heterostructure in various temperature and different atmosphere. X-ray diffraction and Raman spectroscopy were utilized to characterize the structure degradation. For N2 atmosphere annealing, crystal structure can be maintained up to 1000C, with better crystallinity due to recrystallization. The FWHM drop for N2 annealed sample is up to 38.9%. Significant degradation is observed when annealed in air: (i) irreversible lattice relaxation; (ii) oxidation and defect propagation; (iii) phase separation of AlGaN. Starting from 750C, no crystal structure of AlGaN can be detected. Possible failure mechanism is discussed, and these results may be instructive for future device fabrication and optimization.
Subjects/Keywords: Engineering; GaN; HEMT; Heterostructure; XRD
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APA (6th Edition):
Zhang, T. (2018). Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/68r3b1ww
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Teng. “Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure.” 2018. Thesis, UCLA. Accessed February 26, 2021.
http://www.escholarship.org/uc/item/68r3b1ww.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Teng. “Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure.” 2018. Web. 26 Feb 2021.
Vancouver:
Zhang T. Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure. [Internet] [Thesis]. UCLA; 2018. [cited 2021 Feb 26].
Available from: http://www.escholarship.org/uc/item/68r3b1ww.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang T. Thermal Stability and Degradation Analysis of GaN/AlGaN Heterostructure. [Thesis]. UCLA; 2018. Available from: http://www.escholarship.org/uc/item/68r3b1ww
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
Laranjeira, Pedro Miguel Freire de Carvalho Pimentel e.
Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X.
Degree: 2014, Instituto Superior de Ciências da Saúde Egas Moniz
URL: https://www.rcaap.pt/detail.jsp?id=oai:comum.rcaap.pt:10400.26/6261
► Dissertação para obtenção de grau de Mestre em Dentisteria Restauradora e Estética
Em Medicina Dentária, o interesse por restaurações cerâmicas tem sido crescente. As inovações…
(more)
▼ Dissertação para obtenção de grau de Mestre em Dentisteria Restauradora e Estética
Em Medicina Dentária, o interesse por restaurações cerâmicas tem sido crescente. As
inovações têm sido constantes, tanto nos materiais como nas técnicas. A sua elevada
resistência, aliada a uma estética imbativel, estão no centro deste interesse. Os materiais
à base de zircónia lideram esta tendência. A sua natureza refractária, estabilidade
química, dureza elevada e estética superior, tornam estes materiais muito apelativos
para a confecção de restaurações duradouras e estéticas.
Este projecto pretendeu caracterizar e avaliar as propriedades mecânicas de três
materiais à base de zircónia, antes e após serem submetidos a processos de envelhecimento acelerado.
Dos materiais utilizados neste estudo, dois são óxidos de zircónia estabilizados por Ítria, o material Lava (3M ESPE, St Paul, MN, EUA) e o material IPS e.max® ZirCAD (Ivoclar Vivadent, Schaan, Liechtenstein). O terceiro material é o NanoZr (Matsushita Electric Works Co., Shinbashi, Toquio, Japão), um óxido de zircónia estabilizado por Céria.
Todos os materiais utilizados são comercializados para uso em Medicina Dentária. Os materiais foram submetidos a três tipos de envelhecimento artificial: durante 5 horas a 2 bar e 134ºC; durante 30000 ciclos em solução de saliva artificial, em ciclos de 5ºC e 55ºC; e durante 30000 ciclos em solução de saliva artificial e flúor, em ciclos de 5ºC e 55ºC.
As amostras foram testadas à resistência flexural bi-axial, e avaliadas por difracção de raios-X e fluorescência de raios-X. O envelhecimento acelerado causou aumento significativo de fracção monoclínica nos
materiais Y-TZP, não tendo causado alteração significativa no material Ce-TZP. O envelhecimento acelerado não causou alteração da composição elementar dos materiais estudados. O envelhecimento acelerado apenas causou alterações significativas nos valores de resistência flexural bi-axial no material Lava termociclado em Saliva e Flúor.
Advisors/Committee Members: Perdigão, Jorge, Fernandes, Braz.
Subjects/Keywords: Envelhecimento acelerado; Zircónia; XRD; BFT
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APA (6th Edition):
Laranjeira, P. M. F. d. C. P. e. (2014). Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X. (Thesis). Instituto Superior de Ciências da Saúde Egas Moniz. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:comum.rcaap.pt:10400.26/6261
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Laranjeira, Pedro Miguel Freire de Carvalho Pimentel e. “Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X.” 2014. Thesis, Instituto Superior de Ciências da Saúde Egas Moniz. Accessed February 26, 2021.
https://www.rcaap.pt/detail.jsp?id=oai:comum.rcaap.pt:10400.26/6261.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Laranjeira, Pedro Miguel Freire de Carvalho Pimentel e. “Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X.” 2014. Web. 26 Feb 2021.
Vancouver:
Laranjeira PMFdCPe. Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X. [Internet] [Thesis]. Instituto Superior de Ciências da Saúde Egas Moniz; 2014. [cited 2021 Feb 26].
Available from: https://www.rcaap.pt/detail.jsp?id=oai:comum.rcaap.pt:10400.26/6261.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Laranjeira PMFdCPe. Efeito do envelhecimento acelerado em materiais à base de zircónia: resistência flexural bi-axial, difracção de raios X e fluorescência de raios X. [Thesis]. Instituto Superior de Ciências da Saúde Egas Moniz; 2014. Available from: https://www.rcaap.pt/detail.jsp?id=oai:comum.rcaap.pt:10400.26/6261
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Santos, Priscila Ribeiro dos.
A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio.
Degree: Mestrado, Física, 2008, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02032009-163100/
;
► Esta dissertação de mestrado descreve o estudo realizado sobre como a oferta de estrôncio afeta a razão Sr/Ca em hidroxiapatita formada in vitro. Este trabalho…
(more)
▼ Esta dissertação de mestrado descreve o estudo realizado sobre como a oferta de estrôncio afeta a razão Sr/Ca em hidroxiapatita formada in vitro. Este trabalho pretende dar subsídios para que posteriormente seja possível fazer um estudo da razão Sr/Ca em função da temperatura também em hidroxiapatita formada in vitro. Foram utilizadas células osteoblásticas da linhagem MG-63 com concentrações de estrôncio no meio de cultura que variaram de 0,0 até 33,0 microgramas por mL de meio. Os nódulos ósseos formados pelas células foram caracterizados pelas técnicas Absorção de Infravermelho por Transformada de Fourier (FT-IR), que foi utilizada com o objetivo de identificar ligações de fosfato nas amostras, e Difração de Raios-X (XRD), que teve como objetivo confirmar a presença de hidroxiapatita nos minerais formados e comparar a cristalinidade do material com e sem estrôncio. A quantificação da razão Sr/Ca foi feita utilizando as técnicas Retro-espalhamento Rutherford (RBS) e Emissão de Raios-X por Indução de Partículas (PIXE), que são capazes de fazer a identificação e quantificação elementar. Os resultados obtidos mostram que os nódulos formados são compostos por hidroxiapatita. Com relação à quantificação, mostrou-se que não foi possível substituir mais de 10% do íons de cálcio por íons de estrôncio, o que está de acordo com previsões teóricas. Além disso, para altas concentrações de estrôncio no meio a mineralização do cálcio diminuiu duas ordens de grandeza e as medidas da razão Sr/Ca obtiveram resultados bastante dispersos, indicando uma possível mudança metabólica das células que parece inviabilizar o bom funcionamento fisiológico das mesmas.
This Masters dissertation describes the study of how the availability of strontium affects Sr/Ca ratio of in vitro hydroxyapatite. This work intends to provide the basic understanding needed to a future study of how temperature changes Sr/Ca ratio in this material. MG-63 cells were grown in the culture medium doped with 0.0, 1.0, 2.0, 4.1, 8.2, 16.4, 22.9 and 33.0 micrograms of Sr/mL. The nodules formed by osteoblastic cells were characterized by Fourier Transform Infrared Spectroscopy (FT-IR) technique, used to identify phosphate domain, and X-Ray Diffraction (XRD) technique, which was used to verify the presence of crystallized hydroxyapatite in the mineral composition with and without strontium. Quantification of Sr/Ca ratio was made using the Rutherford Backscattering (RBS) and Particle Induced X-Ray Emission (PIXE) techniques, which are used to do elementary identification and quantification. The results of characterization confirmed the presence of hydroxyapatite in the cultivated MG-63 cells. The experiments have shown that it was not possible to replace more than 10% of the calcium ions by strontium, which is consistent with theoretical predictions. In addition, high concentrations of strontium in the growing solution, reduced the mineralization yield and also the Sr/Ca ratio, indicating a possible change in the metabolism of the cells.
Advisors/Committee Members: Added, Nemitala.
Subjects/Keywords: hidroxiapatita; hydroxyapatite; PIXE; PIXE; Sr/Ca; Sr/Ca; XRD; XRD
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APA (6th Edition):
Santos, P. R. d. (2008). A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02032009-163100/ ;
Chicago Manual of Style (16th Edition):
Santos, Priscila Ribeiro dos. “A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio.” 2008. Masters Thesis, University of São Paulo. Accessed February 26, 2021.
http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02032009-163100/ ;.
MLA Handbook (7th Edition):
Santos, Priscila Ribeiro dos. “A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio.” 2008. Web. 26 Feb 2021.
Vancouver:
Santos PRd. A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio. [Internet] [Masters thesis]. University of São Paulo; 2008. [cited 2021 Feb 26].
Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02032009-163100/ ;.
Council of Science Editors:
Santos PRd. A razão Sr/Ca em hidroxiapatita produzida a partir de células ósseas humanas em ambientes com diferentes concentrações de estrôncio. [Masters Thesis]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02032009-163100/ ;
Vilnius University
7.
Bagdzevičienė, Jurga.
Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds.
Degree: PhD, Chemistry, 2012, Vilnius University
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665
;
► In this dissertation, the results of detailed investigation of the seven unique art objects are presented. The presented results show that complex apllying of the…
(more)
▼ In this dissertation, the results of
detailed investigation of the seven unique art objects are
presented. The presented results show that complex apllying of the
instrumental analytical methods of OM, FTIR, SEM/EDX, XRD, μXRD and
µRS is accurate and efficient way to identify composition of works
of art and archaeological finds of glass, pigments or describe
their technology. IR spectroscopy has been successfully applied to
determine pigments and some pigment mixtures in painting‘s ground,
paint layers, and destruction products in archaeological glass. The
SEM/EDX analysis successfully can be used in determining the main
elements of the paint samples at different cross-section points
perform a qualitative analysis of the pigments (cinnabar, lead
white, chalk, smalt et. al. ), in some cases, to discuss the
features of the production of pigments. The SEM/EDX provided a
possibility to examine three archaeological glass beads. According
to the elemental composition, microstructure, and the specific
features in different areas of the glass was defined nature of the
destruction of glass. XRD and μXRD analysis successfully can be
used in determining the crystalline phases in the paint and
archaeological glass samples. Identify following pigments and their
mixtures: calcite CaCO3, carbon, lead tin yellow type I Pb2SnO4,
lead tin yellow type II PbSn03, hydrocerussite 2PbCO3 ∙ Pb (OH)2,
cerussite PbCO3, Egyptian blue CaCuSi4O10, gypsum CaSO4 ∙ 2H2O,
anhydrite CaSO4, huntite Mg3Ca(CO3)4... [to full
text]
Septynių unikalių, didelę istorinę ir meninę
vertę turinčių objektų – trijų XVII ir XVIII a. paveikslų, Senovės
Egipto sarkofago bei trijų archeologinių stiklo karolių iš
Kernavės-Kriveikiškių kapinyno – tyrimams sėkmingai pritaikyti OM,
FTIR, SEM/EDX, XRD, μXRD ir µRS analizės metodai. Konstatuota, kad
taikant kompleksinius tyrimus galima tiksliai ir efektyviai
identifikuoti kūrinių medžiagas, charakterizuoti jų sandarą,
apibūdinti technologijas. IR spektroskopija sėkmingai panaudota
identifikuojant tapybos grunto ir dažų sluoksnių neorganinius
tapybos pigmentus ir jų mišinius bei stiklo korozijos produktus.
Parodyta, kad IR spektroskopija gali būti sėkmingai panaudota
identifikuojant istorines restauravimo medžiagas. SEM/EDX analizės
metodu nustatyta tapybos elementinė sudėtis, identifikuoti
cinoberio, švino baltojo, kreidos, smaltos, suriko ir kt.
pigmentai. SEM/EDX analizės metodu ištirti trys archeologiniai
stiklo karoliai. Pagal elementinės sudėties skirtumus ir
specifinius mikrostruktūros bruožus nustatytas stiklo destrukcijos
pobūdis. XRD ir μXRD analizės metodais sėkmingai identifikuoti šie
pigmentai ir/ar jų mišiniai: kalcitas CaCO3, anglis, I tipo Pb–Sn
geltonasis Pb2SnO4, II tipo Pb–Sn geltonasis PbSn03, hidrocerusitas
2PbCO3∙Pb(OH)2, cerusitas PbCO3, Egipto mėlynasis CaCuSi4O10,
gipsas CaSO4∙2H2O, anhidritas CaSO4, huntitas Mg3Ca(CO3)4,
dolomitas CaMg(CO3)2. Pirmą kartą μRS metodu identifikuotas II tipo
švino alavo geltonasis pigmentas, archeologiniam stiklui... [toliau
žr. visą tekstą]
Advisors/Committee Members: Padarauskas, Audrius (Doctoral dissertation committee chair), Jurkonienė, Sigita (Doctoral dissertation committee member), Lujanienė, Galina (Doctoral dissertation committee member), Norkus, Eugenijus (Doctoral dissertation committee member), Vičkačkaitė, Vida (Doctoral dissertation committee member), Kareiva, Aivaras (Doctoral dissertation opponent), Lukšienė, Benedikta (Doctoral dissertation opponent), Tautkus, Stasys (Doctoral dissertation supervisor).
Subjects/Keywords: Pigments; SEM/EDX; XRD; FTIR; Pigmentai; SEM/EDX; XRD; FTIR
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Bagdzevičienė, J. (2012). Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds. (Doctoral Dissertation). Vilnius University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665 ;
Chicago Manual of Style (16th Edition):
Bagdzevičienė, Jurga. “Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds.” 2012. Doctoral Dissertation, Vilnius University. Accessed February 26, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665 ;.
MLA Handbook (7th Edition):
Bagdzevičienė, Jurga. “Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds.” 2012. Web. 26 Feb 2021.
Vancouver:
Bagdzevičienė J. Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds. [Internet] [Doctoral dissertation]. Vilnius University; 2012. [cited 2021 Feb 26].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665 ;.
Council of Science Editors:
Bagdzevičienė J. Investigation and Description of Ancient Pigments
in Paintings and Archaeological Glass Finds. [Doctoral Dissertation]. Vilnius University; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665 ;
Vilnius University
8.
Bagdzevičienė, Jurga.
Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas.
Degree: Dissertation, Chemistry, 2012, Vilnius University
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394
;
► Septynių unikalių, didelę istorinę ir meninę vertę turinčių objektų – trijų XVII ir XVIII a. paveikslų, Senovės Egipto sarkofago bei trijų archeologinių stiklo karolių iš…
(more)
▼ Septynių unikalių, didelę istorinę ir meninę
vertę turinčių objektų – trijų XVII ir XVIII a. paveikslų, Senovės
Egipto sarkofago bei trijų archeologinių stiklo karolių iš
Kernavės-Kriveikiškių kapinyno – tyrimams sėkmingai pritaikyti OM,
FTIR, SEM/EDX, XRD, μXRD ir µRS analizės metodai. Konstatuota, kad
taikant kompleksinius tyrimus galima tiksliai ir efektyviai
identifikuoti kūrinių medžiagas, charakterizuoti jų sandarą,
apibūdinti technologijas. IR spektroskopija sėkmingai panaudota
identifikuojant tapybos grunto ir dažų sluoksnių neorganinius
tapybos pigmentus ir jų mišinius bei stiklo korozijos produktus.
Parodyta, kad IR spektroskopija gali būti sėkmingai panaudota
identifikuojant istorines restauravimo medžiagas. SEM/EDX analizės
metodu nustatyta tapybos elementinė sudėtis, identifikuoti
cinoberio, švino baltojo, kreidos, smaltos, suriko ir kt.
pigmentai. SEM/EDX analizės metodu ištirti trys archeologiniai
stiklo karoliai. Pagal elementinės sudėties skirtumus ir
specifinius mikrostruktūros bruožus nustatytas stiklo destrukcijos
pobūdis. XRD ir μXRD analizės metodais sėkmingai identifikuoti šie
pigmentai ir/ar jų mišiniai: kalcitas CaCO3, anglis, I tipo Pb–Sn
geltonasis Pb2SnO4, II tipo Pb–Sn geltonasis PbSn03, hidrocerusitas
2PbCO3∙Pb(OH)2, cerusitas PbCO3, Egipto mėlynasis CaCuSi4O10,
gipsas CaSO4∙2H2O, anhidritas CaSO4, huntitas Mg3Ca(CO3)4,
dolomitas CaMg(CO3)2. Pirmą kartą μRS metodu identifikuotas II tipo
švino alavo geltonasis pigmentas, archeologiniam stiklui... [toliau
žr. visą tekstą]
In this dissertation, the results of
detailed investigation of the seven unique art objects are
presented. The presented results show that complex apllying of the
instrumental analytical methods of OM, FTIR, SEM/EDX, XRD, μXRD and
µRS is accurate and efficient way to identify composition of works
of art and archaeological finds of glass, pigments or describe
their technology. IR spectroscopy has been successfully applied to
determine pigments and some pigment mixtures in painting‘s ground,
paint layers, and destruction products in archaeological glass. The
SEM/EDX analysis successfully can be used in determining the main
elements of the paint samples at different cross-section points
perform a qualitative analysis of the pigments (cinnabar, lead
white, chalk, smalt et. al. ), in some cases, to discuss the
features of the production of pigments. The SEM/EDX provided a
possibility to examine three archaeological glass beads. According
to the elemental composition, microstructure, and the specific
features in different areas of the glass was defined nature of the
destruction of glass. XRD and μXRD analysis successfully can be
used in determining the crystalline phases in the paint and
archaeological glass samples. Identify following pigments and their
mixtures: calcite CaCO3, carbon, lead tin yellow type I Pb2SnO4,
lead tin yellow type II PbSn03, hydrocerussite 2PbCO3 ∙ Pb (OH)2,
cerussite PbCO3, Egyptian blue CaCuSi4O10, gypsum CaSO4 ∙ 2H2O,
anhydrite CaSO4, huntite Mg3Ca(CO3)4... [to full
text]
Advisors/Committee Members: Padarauskas, Audrius (Doctoral dissertation committee chair), Jurkonienė, Sigita (Doctoral dissertation committee member), Lujanienė, Galina (Doctoral dissertation committee member), Norkus, Eugenijus (Doctoral dissertation committee member), Vičkačkaitė, Vida (Doctoral dissertation committee member), Kareiva, Aivaras (Doctoral dissertation opponent), Lukšienė, Benedikta (Doctoral dissertation opponent), Tautkus, Stasys (Doctoral dissertation supervisor).
Subjects/Keywords: Pigmentai; SEM/EDX; XRD; FTIR; Pigments; SEM/EDX; XRD; FTIR
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bagdzevičienė, J. (2012). Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas. (Doctoral Dissertation). Vilnius University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394 ;
Chicago Manual of Style (16th Edition):
Bagdzevičienė, Jurga. “Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas.” 2012. Doctoral Dissertation, Vilnius University. Accessed February 26, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394 ;.
MLA Handbook (7th Edition):
Bagdzevičienė, Jurga. “Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas.” 2012. Web. 26 Feb 2021.
Vancouver:
Bagdzevičienė J. Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas. [Internet] [Doctoral dissertation]. Vilnius University; 2012. [cited 2021 Feb 26].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394 ;.
Council of Science Editors:
Bagdzevičienė J. Senovinių pigmentų tapybos kūriniuose ir
archeologinio stiklo radiniuose tyrimas ir
apibūdinimas. [Doctoral Dissertation]. Vilnius University; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394 ;
Vilnius University
9.
Krapukaitytė, Aušra.
Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas.
Degree: Dissertation, Chemistry, 2009, Vilnius University
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154423-80221
;
► Šioje daktaro disertacijoje pirmoje dalyje nustatyta šiuolaikinės, o antroje dalyje – archeologinės keramikos gaminių elementinė ir fazinė sudėtis, bei ištirta morfologija. Šiuolaikinės ir archeologinės keramikos…
(more)
▼ Šioje daktaro disertacijoje pirmoje dalyje
nustatyta šiuolaikinės, o antroje dalyje – archeologinės keramikos
gaminių elementinė ir fazinė sudėtis, bei ištirta morfologija.
Šiuolaikinės ir archeologinės keramikos pavyzdžių elementinė
sudėtis nustatyta Rentgeno spindulių dispersinės analizės (EDX),
liepsnos atominės absorbcinės spektrometrijos (LAAS), titrimetrinės
ir spektrofotometrinės analizės metodais. Parodyta, kad visų
keraminių pavyzdžių kokybinė bei kiekybinė sudėtis yra skirtinga
Nustatyta, kad visuose keramikos mėginiuose pagrindiniai elementai
yra silicis ir aliuminis. SiO2 sudaro 46 – 60% keramikos sudėties,
Al2O3 – apie 17 – 33%. Fe, Na, Mg, K, Ca ir Ti mėginiuose rasta
kelis kartus mažiau. EDX analizė gali būti sėkmingai naudojama
nustatant pagrindinius elementus, kurių kiekiai viršija 0,5 %
bendros elementinės sudėties. Norint nustatyti tikslią keramikos
sudėtį ir pėdsakinius elementus reikia naudoti LAAS analizės
metodą. Aliuminio kiekį keramikoje patikimai galima nustatyti
titrimetriniu, o silicio ir titano kiekį – spektrofotometriniais
metodais. Ištyrus šiuolaikę ir archeologinę keramiką Rentgeno
spindulių difrakcine analize (XRD), nustatyta, kad visų keramikų
pagrindinė fazė yra vienoda – silicio dioksidas SiO2, tačiau jų
bendra fazinė sudėtis skiriasi. Skirtinguose kermikos pavyzdžiuose
buvo aptikos šios fazės: kvarcas, dolomitas, kaolinas, albitas,
mikroklinas, muskovitas, mulitas, hematitas, rutilas, diopsidas,
korundas, titanitas, natrio anortitas.... [toliau žr. visą
tekstą]
The elemental composition of the samples of
modern and archaeological ceramics was determined using the energy
dispersive X-ray analysis, flame atomic absorption spectrometry,
titrimetric and spectrophotometric analysis methods. It has been
shown that the qualitative and quantitative composition of all the
samples is different. It has been established that silicon and
aluminium are the main elements in all the samples. SiO2 accounts
for 46–60 % of the composition of the ceramics, Al2O3 – for some
17–33%. The amounts of Fe, Na, Mg, K, Ca and Ti discovered in the
samples are several times lesser. EDX analysis can successfully be
used in determining the main elements whose amounts exceed 0.5% of
the overall elemental composition. In order to determine the exact
composition of ceramics one has to employ the FAAS analysis method.
To determine in a credible manner the amount of aluminium in
ceramics, one can use the titrimetric method, and the amount of
silicon and titanium – spectrophotometric methods. Upon examination
of the modern and archaeological ceramics by diffraction analysis
it has been established that the main phase of all the samples is
the same – quartz SiO2, however their phase composition varies. In
different samples the following phases have been discovered:
calcite, dolomite, kaolinite, albite, microcline, muscovite,
mullite, hematite, rutile, diopside, corundum, titanite, and sodium
anorthite. Being aware of the phase composition, it has been
established that the... [to full text]
Advisors/Committee Members: Padarauskas, Audrius (Doctoral dissertation committee chair), Barkauskas, Jurgis (Doctoral dissertation committee member), Ramanauskas, Rimantas (Doctoral dissertation committee member), Jurkonienė, Sigita (Doctoral dissertation committee member), Lukšienė, Benedikta (Doctoral dissertation committee member), Vičkačkaitė, Vida (Doctoral dissertation opponent), Naujalis, Evaldas (Doctoral dissertation opponent), Tautkus, Stasys (Doctoral dissertation supervisor), Tautkus, Stasys (Doctoral dissertation advisor).
Subjects/Keywords: Keramika; XRD; SEM; IR;
Termogravimetrija; Ceramics; XRD; SEM; IR; Thermogravimetric
analysis
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Krapukaitytė, A. (2009). Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas. (Doctoral Dissertation). Vilnius University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154423-80221 ;
Chicago Manual of Style (16th Edition):
Krapukaitytė, Aušra. “Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas.” 2009. Doctoral Dissertation, Vilnius University. Accessed February 26, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154423-80221 ;.
MLA Handbook (7th Edition):
Krapukaitytė, Aušra. “Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas.” 2009. Web. 26 Feb 2021.
Vancouver:
Krapukaitytė A. Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas. [Internet] [Doctoral dissertation]. Vilnius University; 2009. [cited 2021 Feb 26].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154423-80221 ;.
Council of Science Editors:
Krapukaitytė A. Šiuolaikinės ir archeologinės keramikos tyrimas ir
apibūdinimas. [Doctoral Dissertation]. Vilnius University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154423-80221 ;
10.
Singh, Rajiv Kumar.
Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates.
Degree: MS, Chemistry, 2012, University of North Dakota
URL: https://commons.und.edu/theses/1321
► Recent decades have witnessed the discovery of a wide variety of nanomaterials. These nanomaterials vary from zero-dimensional nanodots to three-dimensional nanoflowers. However the properties…
(more)
▼ Recent decades have witnessed the discovery of a wide variety of nanomaterials. These nanomaterials vary from zero-dimensional nanodots to three-dimensional nanoflowers. However the properties of these nanomaterials have not been fully explored. A majority of the nonmaterials discovered so far are inorganic. There is little information about nanomaterials which are entirely based on organic compounds. Therefore this thesis focuses on the synthesis of two-dimensional nanosheets based on organic frameworks.
In this study, a number of two-armed and three-armed carboxamides and carbamates have been synthesized, characterized and self-assembly process was studied. The self-assembly of these amides and carbamates were studied in a large number of single solvents as well as combination of solvents. Two-armed amides and carbamates having aromatic cores are found to have poor solubility in all but DMF and DMSO. The two-armed amides and carbamates having linker alkyl chain are found to have good solubility and crystal formation in a few solvents, but the quality of the crystal is not good enough for the
XRD analysis.
The polar solvents along with a trace amount of water are found to be more effective in getting perfect crystals of three-armed carbamates for X-ray crystallography. Carbamates with side-arms of three carbons and a cyclohexyl ring form perfect quality
crystals in EtOAc, MeCN, and THF:H2O. In the process of growing single crystal several crystallization techniques were used. Slow evaporation process is found to be more efficient in getting good quality crystal.
The crystal structures of carbamates have been determined as a part of the project .The morphology of the nanosheets was also studied by the transmission electron microscope (TEM). The TEM image of the carbamates reveals that its morphology is two-dimensional sheet. Additionally, data from powdered
XRD have also revealed the formation of same or similar crystalline isoform from a variety of conditions.
Advisors/Committee Members: Qianli Chu.
Subjects/Keywords: Carbamates; Crystal Structure; Powdered XRD; Self-assembly; TEM; XRD
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APA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Singh, R. K. (2012). Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1321
Chicago Manual of Style (16th Edition):
Singh, Rajiv Kumar. “Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates.” 2012. Masters Thesis, University of North Dakota. Accessed February 26, 2021.
https://commons.und.edu/theses/1321.
MLA Handbook (7th Edition):
Singh, Rajiv Kumar. “Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates.” 2012. Web. 26 Feb 2021.
Vancouver:
Singh RK. Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates. [Internet] [Masters thesis]. University of North Dakota; 2012. [cited 2021 Feb 26].
Available from: https://commons.und.edu/theses/1321.
Council of Science Editors:
Singh RK. Synthesis, Characterization, And Self-Assembly Of Bi-Carbamates And Tri-Carbamates. [Masters Thesis]. University of North Dakota; 2012. Available from: https://commons.und.edu/theses/1321
NSYSU
11.
Zhou , Jing-Wei.
Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices.
Degree: Master, Physics, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713115-100614
► RF magnetron sputtering has been used to deposit thin films of TiO2/HfO2 superlattices in alternating sequence on c-oriented sapphire substrates using titanium, or titanium dioxide,…
(more)
▼ RF magnetron sputtering has been used to deposit thin films of TiO2/HfO2 superlattices
in alternating sequence on c-oriented sapphire substrates using titanium, or titanium
dioxide, and Hafnium dioxide targets. The thin films thus obtained have higher
dielectric constants and better insulation properties. The dielectric characteristics were
studied on samples of different numbers of cycles and thickness ratios of the two oxides.
Two series of samples, classified as series-A for [(TiO21nm/HfO21nm)10cycles and
(TiO23nm/HfO21nm)10cycles], and as series-B for [(TiO21nm/HfO21nm)5cycles and
(TiO23nm/HfO21nm)5cycles]. X-ray diffractometry (
XRD) and transmission electron
microscopy (TEM) have been conducted to examine the structural properties of the
samples in relation to the dielectric properties, and lock-in amplifier used to measure
the internal impedance of the samples from 0.1 Hz to 100kHz. Change of voltage as a
function of frequency was used to calculate the values the frequency dependence of
involved capacitance and inductance.
TEM electron diffraction patterns showed that the HfO2 layers are of a few
nanometer thick and grow epitaxially on the TiO2 thin film by assuming the same
crystal structure of the underlying TiO2 layer. Traditional wisdom suggests that TiO2
thin films grown on c-sapphire should at best be twinned, if epitaxial at all. However,
in this work, the structure of the obtained TiO2 was found to be epitaxial and twin-free.
This is interpreted as associated with the overall chemical bonding forces among the Ti,
O, and Al atoms of the TiO2 (011)-plane on sapphire (0001)-plane. This led to an ideal
epitaxy with orientation relations of (TiO2)(011)//Al2O3(0001), TiO2[010]// Al2O3
[1120] and TiO2[001]// Al2O3 [1010].
Advisors/Committee Members: Den -Jun Jang (chair), Quark Chen (committee member), Chih-hsiung Liao (chair), Li-Wei Tu (chair).
Subjects/Keywords: Dielectric Constant; XRD; TEM; HfO2; Superlattice; TiO2
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Zhou , J. (2015). Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713115-100614
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhou , Jing-Wei. “Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices.” 2015. Thesis, NSYSU. Accessed February 26, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713115-100614.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhou , Jing-Wei. “Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices.” 2015. Web. 26 Feb 2021.
Vancouver:
Zhou J. Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Feb 26].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713115-100614.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhou J. Structures and dielectrics of sputtered epitaxial TiO2/HfO2 superlattices. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713115-100614
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
12.
Mettilda M.
Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;.
Degree: Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/41936
► newline After reviewing past work into the enzymatic treatment of cotton newlineyarns and composites an account is given of the cellulase treatment of cotton newlineyarns…
(more)
▼ newline After reviewing past work into the
enzymatic treatment of cotton newlineyarns and composites an
account is given of the cellulase treatment of cotton newlineyarns
produced from two different spinning technologies and hybrid fibre
newlinecomposites and nano composites which represent one of the
major problems newlinein finishing The shortcomings of the
knowledge are shown to be that newlinealthough a large number of
papers have been published on the enzymatic newlinetreatments of
cotton yarns there have been no systematic studies on the
newlineresponse of regular and compact yarns and there have been
virtually no newlineattempt to characterise the substrates in terms
of their structures newlineFour yarns which comprised of 60 Ne and
80 Ne regular and newlinecompact yarns were subjected to cellulase
treatment under the same newlinecondition and their tenacity
elongation wickability minimum twist of newlinecohesion and bending
rigidity were examined Short staple natural fibres newlinesuch as
sisal jute banana reinforced thermoplastic composites are
newlineincreasingly gaining attention for their emerging
applications in the field newlineof aerospace automotives
construction textiles etc For producing hybrid newlinecomposites
mercerised cotton cellulase treated cotton and sisal fibres were
newlineused The mechanical thermal and morphological
characteristics of hybrid newlinecomposites and nano composites
were studied PP composites were prepared newlineby HAAKE Rheomixer
followed by compression moulding Cloisite 25A was newlineused to
improve the hybrid fibre composites Mechanical tests showed
newlineconsiderable improvements The morphology of hybrid
composites and newlinenanocomposites were examined by SEM Scanning
Electron Microscopy and newlineXRD X ray diffraction
newline
reference p168-188.
Advisors/Committee Members: Kothandaraman B.
Subjects/Keywords: Scanning Electron Microscopy; XRD X ray diffraction
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APA (6th Edition):
M, M. (2015). Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/41936
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
M, Mettilda. “Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;.” 2015. Thesis, Anna University. Accessed February 26, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/41936.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
M, Mettilda. “Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;.” 2015. Web. 26 Feb 2021.
Vancouver:
M M. Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Feb 26].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/41936.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
M M. Studies on cellulase treated Cotton yarns and
polypropylene Cotton sisal fibre hybrid composites;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/41936
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
13.
Hooshiar Fard, Mohammad Ali.
Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes.
Degree: PhD, Department of Chemical and Materials
Engineering, 2011, University of Alberta
URL: https://era.library.ualberta.ca/files/ft848r44g
► Production of oil from the second largest oil deposit in the world, i.e., the Alberta oil sands containing approximately 13% of total proven oil reserves…
(more)
▼ Production of oil from the second largest oil deposit
in the world, i.e., the Alberta oil sands containing approximately
13% of total proven oil reserves in the world (169.9 billion
barrels), has been shown to be significantly influenced by clay
minerals. Clay minerals in particular play a key role in the
settling behaviour of massive amounts of aqueous tailings resulting
from water-based bitumen extraction. A nonaqueous extraction
process is of special interest to extract bitumen from oil sands
due to its potential advantages, such as high bitumen recovery even
from low grade oil sands ores and the elimination of slow settling,
sludge tailings ponds with stable suspensions. While clay minerals
have been characterized in water-based bitumen extraction from the
oil sands to some extent, the gap of knowledge in the
characterization of clay minerals in a nonaqueous bitumen
extraction process has led to the current research. A nonaqueous
bitumen extraction process was established where only toluene and
heptane, with no water additions, were used to extract bitumen from
oil sands ore samples. Bitumen recovery and product quality were
studied under different process conditions, such as the ratio of
toluene to heptane and settling time. Bitumen recovery was found to
be insensitive to the characteristics of the oil sands ores, such
as processability and fines content, although the high fines ore
sample was more sensitive to the extraction conditions. A product
with high purity, containing more than 99.5 wt% bitumen on a
solvent-free basis, was produced at room temperature under the
optimum extraction conditions tested. Quantitative x-ray
diffraction (XRD) analysis revealed an enrichment of kaolinite in
the extraction products (froth stream in water-based extraction and
supernatant in nonaqueous extraction) when compared with the ore.
High resolution transmission electron microscopy (HRTEM)
investigations showed the presence of monolayer discrete smectitic
clay minerals (not detectable by XRD). Illite-smectite
expandability results calculated from HRTEM data have made it
possible to explain the extraordinarily high surface activity in
the primary froth stream. Scanning electron microscopy (SEM)
observations showed some important features (clay-organic
aggregates) which affect the settling behaviour of the solids after
nonaqueous extraction.
Subjects/Keywords: Oil Sands, Clay Minerals, XRD, TEM
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hooshiar Fard, M. A. (2011). Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/ft848r44g
Chicago Manual of Style (16th Edition):
Hooshiar Fard, Mohammad Ali. “Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes.” 2011. Doctoral Dissertation, University of Alberta. Accessed February 26, 2021.
https://era.library.ualberta.ca/files/ft848r44g.
MLA Handbook (7th Edition):
Hooshiar Fard, Mohammad Ali. “Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes.” 2011. Web. 26 Feb 2021.
Vancouver:
Hooshiar Fard MA. Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes. [Internet] [Doctoral dissertation]. University of Alberta; 2011. [cited 2021 Feb 26].
Available from: https://era.library.ualberta.ca/files/ft848r44g.
Council of Science Editors:
Hooshiar Fard MA. Characterization of Clay Minerals in the Athabasca Oil Sands
in Water Extraction and Nonaqueous Solvent Extraction
Processes. [Doctoral Dissertation]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/ft848r44g
University of Georgia
14.
Cook, Jessica Wheat.
Characterization of bronze casting in Insula 56, in Roman Aventicum.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/24585
► This study characterizes metallurgical wastes (slag) recovered from a bronze workshop during excavations in 1997-1998 at the Roman provincial city of Aventicum, located in western…
(more)
▼ This study characterizes metallurgical wastes (slag) recovered from a bronze workshop during excavations in 1997-1998 at the Roman provincial city of Aventicum, located in western Switzerland, then Germania Superior. Previous research has
identified the workshop as one devoted to the production of large leaded bronze statuary. The slag assemblage analyzed in this study is unusual due to the absence of ceramic crucible fragments normally associated with the production of copper alloys.
Instead, this workshop is hypothesized to have used iron crucibles. Electron Microprobe Analysis (EMPA) and X-Ray Diffraction (XRD) were used to analyze the chemical composition of the slags in contrast to previous bulk analysis studies. Modern metal
casting methods were observed for analogues. The data show that the slag reached temperatures between 1350°-1400° C and chemical components indicated the use of sand and lime fluxes. Evidence of high temperatures is proposed as one chemical fingerprint
that can be used to re-assess slag for the presence of iron crucibles in other Roman bronze workshops.
Subjects/Keywords: Aventicum; Classical Bronzes; EMPA; XRD; Roman Metallurgy
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cook, J. W. (2014). Characterization of bronze casting in Insula 56, in Roman Aventicum. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/24585
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cook, Jessica Wheat. “Characterization of bronze casting in Insula 56, in Roman Aventicum.” 2014. Thesis, University of Georgia. Accessed February 26, 2021.
http://hdl.handle.net/10724/24585.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cook, Jessica Wheat. “Characterization of bronze casting in Insula 56, in Roman Aventicum.” 2014. Web. 26 Feb 2021.
Vancouver:
Cook JW. Characterization of bronze casting in Insula 56, in Roman Aventicum. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/10724/24585.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cook JW. Characterization of bronze casting in Insula 56, in Roman Aventicum. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/24585
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
15.
Venkatesh N.
Studies on synthesis of biosurfactants and their
applications.
Degree: Chemical engineering, 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/9983
► Surfactants are surface active compounds capable of reducing surface and interfacial tension at the interfaces between liquids, solids and gases, thereby allowing them to mix…
(more)
▼ Surfactants are surface active compounds capable of
reducing surface and interfacial tension at the interfaces between
liquids, solids and gases, thereby allowing them to mix or disperse
readily as emulsions in water or other liquids. The enormous market
demand for surfactants is currently met by numerous synthetic,
mainly petroleum based, chemical surfactants, which are toxic to
environment and not easily biodegradable. In the present research
work, studies were carried out on synthesis and culture media
optimization of three industrially important biosurfactants
sophorolipids, surfactin and rhamnolipids. After ascertaining the
optimum process conditions, two unconventional substrates, waste
frying sunflower oil and waste frying rice bran oil were employed
as carbon substrates, and the yield of biosurfactants produced were
reported. The objective of utilizing the waste frying oils is not
only to decrease the product cost but to find an avenue to dispose
eco hazardous waste. Glucose was found to be the best carbon source
for the synthesis of surfactin from Bacillus subtilis MTCC 2423 at
a concentration level of 3 g/l, which produced 1.285 g/l of
surfactin. Glucose was found to be the best carbons substrate for
Pseudomonas aeruginosa MTCC 2297. Optimum levels of glucose, sodium
nitrate, temperature and pH were found to be 3.48 g/l, 0.39 g/l,
34.07and#8304;C, 7.4 respectively, by response surface methodology.
Sophorolipids produced with glucose substrate (SL-G) has shown very
good inhibitory action on Staphylococcus aureus and Micrococcus
luteus at low concentrations. Average particle size produced as per
the EDX analysis was found to be 20.81 nm. XRD analysis was used to
study the nature of the silver nanoparticle. From the above studies
it can be concluded that, waste frying oils can be profitably used
to synthesize biosurfactants, which are required in bulk quantities
for various medicinal, industrial and environmental
applications.
References p. 174-199, List of publications p.
200-201
Advisors/Committee Members: Vedaraman N.
Subjects/Keywords: Biosurfactants; Sophorolipids; Surfactin; Rhamnolipids; XRD analysis
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APA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
N, V. (2013). Studies on synthesis of biosurfactants and their
applications. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/9983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
N, Venkatesh. “Studies on synthesis of biosurfactants and their
applications.” 2013. Thesis, Anna University. Accessed February 26, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/9983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
N, Venkatesh. “Studies on synthesis of biosurfactants and their
applications.” 2013. Web. 26 Feb 2021.
Vancouver:
N V. Studies on synthesis of biosurfactants and their
applications. [Internet] [Thesis]. Anna University; 2013. [cited 2021 Feb 26].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
N V. Studies on synthesis of biosurfactants and their
applications. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Meitei, S Dhiren.
Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -.
Degree: Physics, 2011, Manipur University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/26604
Subjects/Keywords: XRD; Photoluminescence; Synthesis
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APA ·
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Manager
APA (6th Edition):
Meitei, S. D. (2011). Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -. (Thesis). Manipur University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26604
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meitei, S Dhiren. “Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -.” 2011. Thesis, Manipur University. Accessed February 26, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/26604.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meitei, S Dhiren. “Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -.” 2011. Web. 26 Feb 2021.
Vancouver:
Meitei SD. Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -. [Internet] [Thesis]. Manipur University; 2011. [cited 2021 Feb 26].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26604.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meitei SD. Synthesis,characterization and photoluminescence of zro2:
eu3 nanocrystals; -. [Thesis]. Manipur University; 2011. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26604
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
17.
Ling, Florence T.
Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites.
Degree: 2016, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/13154ftl102
► Manganese (Mn) oxides have long been challenging to study using conventional materials characterization techniques due to their small particle size, poor crystallinity and variable structure…
(more)
▼ Manganese (Mn) oxides have long been challenging to study using conventional materials characterization techniques due to their small particle size, poor crystallinity and variable structure at the nanoscale. The phyllomanganates within the birnessite family, for example, exhibit a diversity of Mn oxidation states, interlayer cations, water contents, and octahedral vacancy concentrations. These differences lead to subtle structural modifications that control the redox and cation exchange capacities of birnessite phases in soils, and they determine the usefulness of birnessites for environmental applications, such as the remediation of contaminant metals. Although powder X-ray diffraction (
XRD) can offer deep insights into birnessite crystallography, spectroscopic techniques provide complementary information when structural disorder is high.
This study introduces Fourier-transform infrared spectroscopy (FTIR) as a method for analyzing birnessite varieties, coupling our analyses with synchrotron X-ray diffraction and absorption spectroscopy for comparison. We found that FTIR can readily differentiate synthetic triclinic Na-birnessite and hexagonal H-birnessite. The region from 400 to 750 cm-1, which is most sensitive to Mn-O bond vibrations, displays the most prominent distinctions between the two varieties, with peaks at ~418, ~478, and ~511 cm-1 in synthetic triclinic Na-birnessite, and peaks at ~440 and ~494 cm-1 in hexagonal H-birnessite. Spectral unmixing of known mixtures of triclinic and hexagonal birnessite yielded errors comparable to results from linear combination fitting (LCF) of extended X-ray absorption fine-structure (EXAFS) data. Spectral unmixing of synthetic cation-exchanged birnessites, including K-birnessite, Ba-birnessite, Ca-birnessite, and two hexagonal birnessite samples prepared in pH 3 and HEPES-buffered pH 7 solutions, also yielded fractions of triclinic and hexagonal birnessite comparable to those calculated by LCF of EXAFS data. Our EXAFS, FTIR, and Rietveld refinements of
XRD data all confirmed that as Mn3+ content increases, the triclinic character of the birnessite also increases, as manifested by an increase in the β angle and in the length of the a-axis of the unit cell.
With these synthetic samples providing a baseline for comparison, natural birnessite samples next were interrogated using the same suite of techniques. Contrary to the common assumption that most natural birnessites are hexagonal, our FTIR and EXAFS investigations revealed natural birnessite varieties as either triclinic or hexagonal or, most commonly, a mixture of the two. Further, this work demonstrates that the use of biological buffers such as HEPES and MES can promote the transformation of synthetic triclinic Na-birnessite into hexagonal H-birnessite, perhaps accounting for the presumption of hexagonal symmetry in natural biogenic samples. When our EXAFS and FTIR analyses were combined with X-ray photoelectron spectroscopy (XPS) data in an allied study (Ilton et al. 2016), a relation between Mn3+…
Advisors/Committee Members: Peter J. Heaney, Dissertation Advisor/Co-Advisor, Peter J. Heaney, Committee Chair/Co-Chair, James D. Kubicki, Committee Member, Christopher H. House, Committee Member, William D. Burgos, Outside Member.
Subjects/Keywords: birnessite; manganese oxide; FTIR; EXAFS; XRD; lead
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APA (6th Edition):
Ling, F. T. (2016). Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13154ftl102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ling, Florence T. “Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites.” 2016. Thesis, Penn State University. Accessed February 26, 2021.
https://submit-etda.libraries.psu.edu/catalog/13154ftl102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ling, Florence T. “Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites.” 2016. Web. 26 Feb 2021.
Vancouver:
Ling FT. Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Feb 26].
Available from: https://submit-etda.libraries.psu.edu/catalog/13154ftl102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ling FT. Mineralogical and Geochemical Analyses of Synthetic and Natural Birnessites. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/13154ftl102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
18.
Dayal, Manmeet Singh.
Effects of additives on mechanical and structural properties on bacterial cellulose composites.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/22694
► Bacterial cellulose (BC) exhibits unique properties including high mechanical strength and high crystallinity. Improvement in the mechanical properties of BC is sought for many applications…
(more)
▼ Bacterial cellulose (BC) exhibits unique properties including high mechanical strength and high crystallinity. Improvement in the mechanical properties of BC is sought for many applications ranging from structural composites to biomedical materials. In this study, different additives including carboxymethyl cellulose (CMC), pectin, gelatin, corn starch, and corn steep liquor were added into the fermentation media to alter the BC produced. Three different concentrations (1%, 3% and 5%) were chosen for each of the additives, with no additive (0%) being the control. The produced BC was then analyzed to determine tensile and compression modulus, and a significant increase in these value were observed (p<0.05). Amongst the tested additives, BC produced in media containing 3% (w/v) pectin had a maximum compressive modulus (142 kPa), and BC produced in media containing 1% (w/v) gelatin exhibited the maximum tensile modulus (21 MPa). Pellicle from pectin in media was comparatively harder than control. Substantial variation in porosity and water holding capacity of BC pellicles were also observed under the influence of media additives (p<0.05). Structural characteristics of BC and BC-additive composites were compared using X-Ray diffraction (
XRD). The crystal size and crystallinity of BC was reduced when grown in the presence of CMC and gelatin; of the additions, pectin only decreased the crystallite size. This suggested that CMC and gelatin were incorporated into the BC fibril structure. The field emission scanning electron microscopy (FESEM) images showed the increased micro-fibril aggregation in BC pellicle on addition of additives to the culture media.
Advisors/Committee Members: Jeffrey M Catchmark, Thesis Advisor/Co-Advisor, Virendra Puri, Thesis Advisor/Co-Advisor, David I Soybel, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Bacterial cellulose; additives; mechanical properties; XRD; FESEM
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APA (6th Edition):
Dayal, M. S. (2014). Effects of additives on mechanical and structural properties on bacterial cellulose composites. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22694
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dayal, Manmeet Singh. “Effects of additives on mechanical and structural properties on bacterial cellulose composites.” 2014. Thesis, Penn State University. Accessed February 26, 2021.
https://submit-etda.libraries.psu.edu/catalog/22694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dayal, Manmeet Singh. “Effects of additives on mechanical and structural properties on bacterial cellulose composites.” 2014. Web. 26 Feb 2021.
Vancouver:
Dayal MS. Effects of additives on mechanical and structural properties on bacterial cellulose composites. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Feb 26].
Available from: https://submit-etda.libraries.psu.edu/catalog/22694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dayal MS. Effects of additives on mechanical and structural properties on bacterial cellulose composites. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22694
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queensland University of Technology
19.
Onions, Katrina Leigh.
Characterisation of soils with the use of instrumental techniques : a multivariate forensic study.
Degree: 2009, Queensland University of Technology
URL: https://eprints.qut.edu.au/30420/
► The value of soil evidence in the forensic discipline is well known. However, it would be advantageous if an in-situ method was available that could…
(more)
▼ The value of soil evidence in the forensic discipline is well known. However, it would be advantageous if an in-situ method was available that could record responses from tyre or shoe impressions in ground soil at the crime scene. The development of optical fibres and emerging portable NIR instruments has unveiled a potential methodology which could permit such a proposal. The NIR spectral region contains rich chemical information in the form of overtone and combination bands of the fundamental infrared absorptions and low-energy electronic transitions. This region has in the past, been perceived as being too complex for interpretation and consequently was scarcely utilized. The application of NIR in the forensic discipline is virtually non-existent creating a vacancy for research in this area. NIR spectroscopy has great potential in the forensic discipline as it is simple, nondestructive and capable of rapidly providing information relating to chemical composition. The objective of this study is to investigate the ability of NIR spectroscopy combined with Chemometrics to discriminate between individual soils. A further objective is to apply the NIR process to a simulated forensic scenario where soil transfer occurs. NIR spectra were recorded from twenty-seven soils sampled from the Logan region in South-East Queensland, Australia. A series of three high quartz soils were mixed with three different kaolinites in varying ratios and NIR spectra collected. Spectra were also collected from six soils as the temperature of the soils was ramped from room temperature up to 6000C. Finally, a forensic scenario was simulated where the transferral of ground soil to shoe soles was investigated. Chemometrics methods such as the commonly known Principal Component Analysis (PCA), the less well known fuzzy clustering (FC) and ranking by means of multicriteria decision making (MCDM) methodology were employed to interpret the spectral results. All soils were characterised using Inductively Coupled Plasma Optical Emission Spectroscopy and X-Ray Diffractometry. Results were promising revealing NIR combined with Chemometrics is capable of discriminating between the various soils. Peak assignments were established by comparing the spectra of known minerals with the spectra collected from the soil samples. The temperature dependent NIR analysis confirmed the assignments of the absorptions due to adsorbed and molecular bound water. The relative intensities of the identified NIR absorptions reflected the quantitative XRD and ICP characterisation results. PCA and FC analysis of the raw soils in the initial NIR investigation revealed that the soils were primarily distinguished on the basis of their relative quartz and kaolinte contents, and to a lesser extent on the horizon from which they originated. Furthermore, PCA could distinguish between the three kaolinites used in the study, suggesting that the NIR spectral region was sensitive enough to contain information describing variation within kaolinite itself. The forensic…
Subjects/Keywords: soil; NIR; XRD; ICP; forensics; chemometrics; MCDM
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APA (6th Edition):
Onions, K. L. (2009). Characterisation of soils with the use of instrumental techniques : a multivariate forensic study. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/30420/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Onions, Katrina Leigh. “Characterisation of soils with the use of instrumental techniques : a multivariate forensic study.” 2009. Thesis, Queensland University of Technology. Accessed February 26, 2021.
https://eprints.qut.edu.au/30420/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Onions, Katrina Leigh. “Characterisation of soils with the use of instrumental techniques : a multivariate forensic study.” 2009. Web. 26 Feb 2021.
Vancouver:
Onions KL. Characterisation of soils with the use of instrumental techniques : a multivariate forensic study. [Internet] [Thesis]. Queensland University of Technology; 2009. [cited 2021 Feb 26].
Available from: https://eprints.qut.edu.au/30420/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Onions KL. Characterisation of soils with the use of instrumental techniques : a multivariate forensic study. [Thesis]. Queensland University of Technology; 2009. Available from: https://eprints.qut.edu.au/30420/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
20.
Khalf, Abdulkarim.
Lead-free ferroelectric glass-ceramics and composites.
Degree: PhD, 2018, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/leadfree-ferroelectric-glassceramics-and-composites(33a5ca87-89ca-48d3-94c8-eb3c166067d5).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740402
► Glass-ceramic composites and nanocrystalline glass-ceramics containing barium titanate (BT) or potassium sodium niobate (KNN) ferroelectric phases have been studied, with particular regard to their use…
(more)
▼ Glass-ceramic composites and nanocrystalline glass-ceramics containing barium titanate (BT) or potassium sodium niobate (KNN) ferroelectric phases have been studied, with particular regard to their use as dielectric energy storage materials. Barium borosilicate glass (BBS) was used as a sintering aid for BT and KNN, producing glass-ceramic composites. The temperatures required to achieve densification were reduced from 1400 to 1200 °C for BCZT (Ca, Zr-doped BT) and 1170 to 1050 °C for KBN (Bi, Na, K, Zr-doped KNN) by the use of glass additives. An unexpected observation, found in both BCZT and KBN systems, was the heterogeneous dissolution of dopant elements into the glass, inducing additional anomalies in the relative permittivity-temperature relationships. For BCZT, the orthorhombic-tetragonal phase transformation temperature shifted upwards to â 50 °C, which was attributed to modification of the Ca/Zr ratio by preferential dissolution of Ca into the glass phase. Similarly, for KBN the dopant elements appeared to be leached into the liquid phase during sintering, resulting in relative permittivity-temperature characteristics similar to those of pure KNN. A modified BBS glass having various KNN contents was prepared by the conventional melt-quenching method and then heat-treated to induce crystallisation, producing nanocrystalline glass-ceramics. It is shown that crystallisation of an intermediate barium niobate phase initiates at temperatures in the region of 650 °C; this is subsequently converted into perovskite KNN together with a second phase of Ba3Nb5O15 at temperatures from 700 to 800 °C. The final crystallite size was in the region of 30±7 nm. The highest dielectric energy storage density of 0.134(4) J cm-3 was obtained for a glass-modified BT ceramic at an electric field level of 5 kV mm-1. However, the energy storage efficiency of the BT-based ceramics was relatively poor and they displayed a general tendency for saturation, indicating potentially poor performance at higher field levels. On the other hand, the KNN-based ceramics exhibited slightly lower energy storage density values, up to 0.108(1) J cm-3, but with much improved linearity and energy storage efficiency. Therefore, the latter is considered to be more suitable as energy storage dielectrics. The BBS-KNN glass-ceramics yielded relatively low energy storage density, 0.035(2) J cm-3, but the dielectric linearity and storage efficiency were similar to or better than those of the KNN ceramics, indicating good potential for use as energy storage dielectrics at very high electric field levels as a result of their nanocrystalline microstructures.
Subjects/Keywords: 620; Lead free; glass-ceramics; XRD diffraction
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APA (6th Edition):
Khalf, A. (2018). Lead-free ferroelectric glass-ceramics and composites. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/leadfree-ferroelectric-glassceramics-and-composites(33a5ca87-89ca-48d3-94c8-eb3c166067d5).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740402
Chicago Manual of Style (16th Edition):
Khalf, Abdulkarim. “Lead-free ferroelectric glass-ceramics and composites.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 26, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/leadfree-ferroelectric-glassceramics-and-composites(33a5ca87-89ca-48d3-94c8-eb3c166067d5).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740402.
MLA Handbook (7th Edition):
Khalf, Abdulkarim. “Lead-free ferroelectric glass-ceramics and composites.” 2018. Web. 26 Feb 2021.
Vancouver:
Khalf A. Lead-free ferroelectric glass-ceramics and composites. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Feb 26].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/leadfree-ferroelectric-glassceramics-and-composites(33a5ca87-89ca-48d3-94c8-eb3c166067d5).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740402.
Council of Science Editors:
Khalf A. Lead-free ferroelectric glass-ceramics and composites. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/leadfree-ferroelectric-glassceramics-and-composites(33a5ca87-89ca-48d3-94c8-eb3c166067d5).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740402
Delft University of Technology
21.
de Zeeuw, Willem (author).
Predicting the Mechanical Properties of Animal Glue Thin Films.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:2714c216-e202-4259-a616-73f0ece5cd32
► This report shows that animal glue from porcine skins can be used to make thin films with reproducible properties. It shows that the tensile strength…
(more)
▼ This report shows that animal glue from porcine skins can be used to make thin films with reproducible properties. It shows that the tensile strength of the film relates linearly to the bloom strength, while the stiffness remains constant for temperatures lower than the glass transition temperature. The report continues to show how Differential Scanning Calorimetry (DSC), Fourier Infra-red Spectroscopy (FTIR), and X-ray Diffraction (
XRD) can be used to predict the strength of an animal glue film. The test results show that
XRD is the easiest method to obtain a reasonable prediction of the mechanical properties. Meanwhile, DSC holds additional information on the internal stress state of the sample, which may promise better predictions of the mechanical properties once the analysis has been optimized.
Advisors/Committee Members: Groves, Roger (mentor), Poulis, Hans (graduation committee), Bijleveld, Johan (graduation committee), van Duin, P (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Animal Glue; Gelatin; XRD; Cultural Heritage; DSC
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APA (6th Edition):
de Zeeuw, W. (. (2017). Predicting the Mechanical Properties of Animal Glue Thin Films. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2714c216-e202-4259-a616-73f0ece5cd32
Chicago Manual of Style (16th Edition):
de Zeeuw, Willem (author). “Predicting the Mechanical Properties of Animal Glue Thin Films.” 2017. Masters Thesis, Delft University of Technology. Accessed February 26, 2021.
http://resolver.tudelft.nl/uuid:2714c216-e202-4259-a616-73f0ece5cd32.
MLA Handbook (7th Edition):
de Zeeuw, Willem (author). “Predicting the Mechanical Properties of Animal Glue Thin Films.” 2017. Web. 26 Feb 2021.
Vancouver:
de Zeeuw W(. Predicting the Mechanical Properties of Animal Glue Thin Films. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Feb 26].
Available from: http://resolver.tudelft.nl/uuid:2714c216-e202-4259-a616-73f0ece5cd32.
Council of Science Editors:
de Zeeuw W(. Predicting the Mechanical Properties of Animal Glue Thin Films. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:2714c216-e202-4259-a616-73f0ece5cd32
Princeton University
22.
Davies, Gregory.
Characterization of batteries using ultrasound: applications for battery management and structural determination
.
Degree: PhD, 2018, Princeton University
URL: http://arks.princeton.edu/ark:/88435/dsp01cn69m683b
► Ultrasound has been an invaluable and widely used tool in the medical and non-destructive testing (NDT) sectors. Much of its success is attributable to its…
(more)
▼ Ultrasound has been an invaluable and widely used tool in the medical and non-destructive testing (NDT) sectors. Much of its success is attributable to its low-cost, compact size, the speed and ease of its application, and the useful qualitative information that it provides. However, until recently the technique has not been applied to dynamic and changing material systems. This dissertation explores the application of ultrasonic techniques to characterize batteries - systems that undergo both electrochemical and mechanical changes during the course of their lifetime (charging, discharging, aging). Two battery specific applications are surveyed: (i) the application of ultrasound for accurate predictions of state of charge (SOC) and state of health (SOH), as a method for augmenting traditional battery management systems; and (ii) the application of ultrasound for tomographic imaging. In addition, two more fundamental studies are presented: (i) a computational investigation of the coupled electrochemical-mechanical changes and structural properties of a cycling battery that give rise to the measured, changing ultrasonic signals; and (ii) an in-operando cycling/ultrasound/energy-dispersive x-ray diffraction (EDXRD) study of a battery, investigating the relationships between its internal material structures and its ultrasonic characterization.
More specifically, in Chapter 2 ultrasonic measurements were combined with a supervised machine-learning technique, which was used to predict the SOC and SOH of lithium-ion cells that had been operated for several hundred cycles. Excellent results were demonstrated, with the technique showing an accuracy of ~1% for both SOC and SOH prediction. In Chapter 3, to explain the measurable and repeatable ultrasonic signal changes during cycling, a model of ultrasonic propagation through a finely layered lithium-ion battery structure was developed. The model demonstrated that graphite is the primary determinant of the ultrasonic response of a cycling battery, and that finely layered structures can significantly impact wave propagation. Next, in Chapter 4, the combination of ultrasonic measurements with full-waveform inversion techniques originating from geophysics was investigated, demonstrating that using ultrasound for structure and property reconstruction may be feasible. Finally, Chapter 5 presents the in-situ ultrasound/EDXRD experiment, linking specific material properties with previously unexplained behaviors in the ultrasonic signals.
Advisors/Committee Members: Steingart, Daniel (advisor).
Subjects/Keywords: Batteries;
Inversions;
SOC;
SOH;
Ultrasound;
XRD
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APA ·
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APA (6th Edition):
Davies, G. (2018). Characterization of batteries using ultrasound: applications for battery management and structural determination
. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01cn69m683b
Chicago Manual of Style (16th Edition):
Davies, Gregory. “Characterization of batteries using ultrasound: applications for battery management and structural determination
.” 2018. Doctoral Dissertation, Princeton University. Accessed February 26, 2021.
http://arks.princeton.edu/ark:/88435/dsp01cn69m683b.
MLA Handbook (7th Edition):
Davies, Gregory. “Characterization of batteries using ultrasound: applications for battery management and structural determination
.” 2018. Web. 26 Feb 2021.
Vancouver:
Davies G. Characterization of batteries using ultrasound: applications for battery management and structural determination
. [Internet] [Doctoral dissertation]. Princeton University; 2018. [cited 2021 Feb 26].
Available from: http://arks.princeton.edu/ark:/88435/dsp01cn69m683b.
Council of Science Editors:
Davies G. Characterization of batteries using ultrasound: applications for battery management and structural determination
. [Doctoral Dissertation]. Princeton University; 2018. Available from: http://arks.princeton.edu/ark:/88435/dsp01cn69m683b
University of Waterloo
23.
Wang, Xueren.
InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.
Degree: 2016, University of Waterloo
URL: http://hdl.handle.net/10012/10677
► In the past two decades, mid-infrared (MIR) quantum cascade laser (QCL) research has been rapidly developed and has resulted in an enabling platform for the…
(more)
▼ In the past two decades, mid-infrared (MIR) quantum cascade laser (QCL) research has been rapidly developed and has resulted in an enabling platform for the remote sensing and metrology. QCL is designed by spatial confinement in quantum well structures on a nanometer scale, enabling the transitions between the electron confined states. In order to obtain the particular characteristics via quantum engineering, the material growth needs to be precisely controlled across the large number of layers. In this work, the growth condition of InAs/AlSb based MIR-QCL, grown by molecular beam epitaxy (MBE), is investigated. A low defect density growth result is observed by employing the optimized growth condition. Laser devices with disk mesa or ridge waveguide are fabricated, and the further electrical characterization exhibits the device lasing at 3.4 μm with a threshold current density of around 2.1 kA/cm2. The superlattice average layer thickness is determined by using high resolution X-ray diffraction (HRXRD), which is considered as one of the non-destructive analysis technique to extract the information about the thin film constructions. Comprehensive modeling built and simulation results are analyzed and discussed based on the HRXRD ω-2θ scanning curve, yielding valuable information about the full structure device growth result. The interface related simulations are performed by using RADS software to investigate the relationship between the strain distribution and the relative intensities of the SL reflections in XRD.
Subjects/Keywords: InAs/AlSb; Mid-infrared QCL; XRD
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APA (6th Edition):
Wang, X. (2016). InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Xueren. “InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.” 2016. Thesis, University of Waterloo. Accessed February 26, 2021.
http://hdl.handle.net/10012/10677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Xueren. “InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.” 2016. Web. 26 Feb 2021.
Vancouver:
Wang X. InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/10012/10677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang X. InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/10677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Catholique de Louvain
24.
Cea, Andrew Ken.
Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production.
Degree: 2020, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/239389
► Every year, hospitals around the world diagnose and treat 48 million patients with medical isotopes. To this day, the majority of medical isotopes are produced…
(more)
▼ Every year, hospitals around the world diagnose and treat 48 million patients with medical isotopes. To this day, the majority of medical isotopes are produced by the fission of high-enriched uranium (235U > 20%) in the forms of UAlx (UAl4, UAl3, and UAl2) targets. This thesis investigates in parallel, how to improve the current UAlx based medical isotope production method and the potential use of the high-density U6Mn (U-density 16.8 g cm-3) alloy to replace the fissile material in next generation low-enriched uranium targets. The oxidation or “digestion” of these materials are studied in basic media to optimize the extraction of isotopes from these fuel types. Part 1 of this thesis studies the digestion of UAlx materials. In UAlx materials, it is found through SEM and energy-dispersive X-ray (EDX) images, that oxidation of triple junctions and intergranular oxidation are key mechanisms in converting UAlx fuel, to UO2 and Na2U2O7 (yellow cake). An aluminum phase present at the grain boundaries is shown to highly enhance oxidation. Electron backscatter diffraction (EBSD) is used to further investigate oxidation at the grain boundaries leading to the discovery of favorable grain boundaries for digestion. Additionally, it is found that smaller grain sizes outperform larger grain sizes in digestion. Part 2 of this thesis studies the digestion of U6Mn. In contrast, U6Mn fuel is resistant to digestion in the same medium and conditions. The use of the oxidant potassium permanganate (KMnO4) is shown to interact with U6Mn particle surfaces to form Na2U2O7. This demonstrates for the first time a successful process that makes this fuel feasible for isotope production. The grain boundary engineering of UAlx fuel can improve currently used isotope extraction processes without adding any additional oxidants, while the use of an oxidant in high-density fuels provides us with a new economically advantageous method for isotope extraction in next generation LEU targets.
(FSA - Sciences de l'ingénieur) – UCL, 2020
Advisors/Committee Members: UCL - SST/IMMC - Institute of Mechanics, Materials and Civil Engineering, UCL - Ecole Polytechnique de Louvain, Pardoen, Thomas, Terryn, Herman, Jeanmart, Herve, van Den Berghe, Sven, Host, Valery, Burke, Grace, Jacques, Pascale, Leenaers, Ann.
Subjects/Keywords: Microstructure; EBSD; Medical Isotopes; EDXS; XRD
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APA (6th Edition):
Cea, A. K. (2020). Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/239389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cea, Andrew Ken. “Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production.” 2020. Thesis, Université Catholique de Louvain. Accessed February 26, 2021.
http://hdl.handle.net/2078.1/239389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cea, Andrew Ken. “Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production.” 2020. Web. 26 Feb 2021.
Vancouver:
Cea AK. Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production. [Internet] [Thesis]. Université Catholique de Louvain; 2020. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/2078.1/239389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cea AK. Microstructure and digestion analysis of UAl and UMn alloys for medical isotope production. [Thesis]. Université Catholique de Louvain; 2020. Available from: http://hdl.handle.net/2078.1/239389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
25.
Booker, Edward Peter.
Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors.
Degree: PhD, 2019, University of Cambridge
URL: https://doi.org/10.17863/CAM.34834
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763844
► This thesis investigates some of the physics of semiconducting low-dimensional structures at low temperatures, as well as investigating the effects of defects on low-dimensional structures…
(more)
▼ This thesis investigates some of the physics of semiconducting low-dimensional structures at low temperatures, as well as investigating the effects of defects on low-dimensional structures and magnetic fields on charge recombination in organic photovoltaics (OPVs). The applications of the systems studied vary from photodetectors, to LEDs, lasers and solar cells. We synthesised Cs2CuCl4 and CsCuCl3 nanoparticles. By varying the ratio of coordination solvents in the synthesis we can control the composition and morphologies of the fabricated nanoparticles, including dots, rods and wires. These nanocrystals showed broadband green emission upon excitation with sub-300 nm radiation, which we showed was due to emission from an intra-band Cu(II) defect. We also fabricated a variety of alkylammonium lead iodide materials. We found that hexylammonium lead iodide and dodecylammonium lead iodide emit broadband red light at low temperatures due to a Frenkel defect (f-centre). Additionally, we see evidence of biexciton emission in dodecylammonium lead iodide films at high excitation densities below temperatures of 225 K. The films in this study were seen to adopt two coexistent phases of dodecylammonium lead iodide, both a monoclinic P121/a structure and an orthorhombic Pbca structure, at room temperature. These films were used as the gain medium in a biexciton vertical cavity laser. This device was constructed from a distributed Bragg reflector coated with dodecylammonium lead iodide, a poly(methylmethacrylate) spacer layer, and an evaporated silver mirror. The onset of lasing was seen at 5.6 × 1018 excitations/cm3 at 75 K. Finally, the modulation of open-circuit voltage and short-circuit current by applied magnetic field in OPV devices made from PIDTPhanQ and PC(71)BM was investigated. We saw that magnetic fields influenced the recombination of charge-transfer (CT) states, and simulations indicated that the formation of CT states had a significant contribution from the bimolecular recombination of free charges. The simulations also showed that singlet CT state lifetimes were much smaller than triplet CT state lifetimes.
Subjects/Keywords: 537.6; Perovskite; Laser; Colour Centre; Nanoparticle; XRD
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APA (6th Edition):
Booker, E. P. (2019). Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.34834 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763844
Chicago Manual of Style (16th Edition):
Booker, Edward Peter. “Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors.” 2019. Doctoral Dissertation, University of Cambridge. Accessed February 26, 2021.
https://doi.org/10.17863/CAM.34834 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763844.
MLA Handbook (7th Edition):
Booker, Edward Peter. “Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors.” 2019. Web. 26 Feb 2021.
Vancouver:
Booker EP. Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Feb 26].
Available from: https://doi.org/10.17863/CAM.34834 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763844.
Council of Science Editors:
Booker EP. Effects of low temperature and structure on the photophysics of alkylammonium lead halide semiconductors. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://doi.org/10.17863/CAM.34834 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763844
Vilnius University
26.
Krapukaitytė, Aušra.
Investigation and description of modern and
archeological ceramics.
Degree: PhD, Chemistry, 2009, Vilnius University
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154440-91021
;
► The elemental composition of the samples of modern and archaeological ceramics was determined using the energy dispersive X-ray analysis, flame atomic absorption spectrometry, titrimetric and…
(more)
▼ The elemental composition of the samples of
modern and archaeological ceramics was determined using the energy
dispersive X-ray analysis, flame atomic absorption spectrometry,
titrimetric and spectrophotometric analysis methods. It has been
shown that the qualitative and quantitative composition of all the
samples is different. It has been established that silicon and
aluminium are the main elements in all the samples. SiO2 accounts
for 46–60 % of the composition of the ceramics, Al2O3 – for some
17–33%. The amounts of Fe, Na, Mg, K, Ca and Ti discovered in the
samples are several times lesser. EDX analysis can successfully be
used in determining the main elements whose amounts exceed 0.5% of
the overall elemental composition. In order to determine the exact
composition of ceramics one has to employ the FAAS analysis method.
To determine in a credible manner the amount of aluminium in
ceramics, one can use the titrimetric method, and the amount of
silicon and titanium – spectrophotometric methods. Upon examination
of the modern and archaeological ceramics by diffraction analysis
it has been established that the main phase of all the samples is
the same – quartz SiO2, however their phase composition varies. In
different samples the following phases have been discovered:
calcite, dolomite, kaolinite, albite, microcline, muscovite,
mullite, hematite, rutile, diopside, corundum, titanite, and sodium
anorthite. Being aware of the phase composition, it has been
established that the... [to full text]
Šioje daktaro disertacijoje pirmoje dalyje
nustatyta šiuolaikinės, o antroje dalyje – archeologinės keramikos
gaminių elementinė ir fazinė sudėtis, bei ištirta morfologija.
Šiuolaikinės ir archeologinės keramikos pavyzdžių elementinė
sudėtis nustatyta Rentgeno spindulių dispersinės analizės (EDX),
liepsnos atominės absorbcinės spektrometrijos (LAAS), titrimetrinės
ir spektrofotometrinės analizės metodais. Parodyta, kad visų
keraminių pavyzdžių kokybinė bei kiekybinė sudėtis yra skirtinga
Nustatyta, kad visuose keramikos mėginiuose pagrindiniai elementai
yra silicis ir aliuminis. SiO2 sudaro 46 – 60% keramikos sudėties,
Al2O3 – apie 17 – 33%. Fe, Na, Mg, K, Ca ir Ti mėginiuose rasta
kelis kartus mažiau. EDX analizė gali būti sėkmingai naudojama
nustatant pagrindinius elementus, kurių kiekiai viršija 0,5 %
bendros elementinės sudėties. Norint nustatyti tikslią keramikos
sudėtį ir pėdsakinius elementus reikia naudoti LAAS analizės
metodą. Aliuminio kiekį keramikoje patikimai galima nustatyti
titrimetriniu, o silicio ir titano kiekį – spektrofotometriniais
metodais. Ištyrus šiuolaikę ir archeologinę keramiką Rentgeno
spindulių difrakcine analize (XRD), nustatyta, kad visų keramikų
pagrindinė fazė yra vienoda – silicio dioksidas SiO2, tačiau jų
bendra fazinė sudėtis skiriasi. Skirtinguose kermikos pavyzdžiuose
buvo aptikos šios fazės: kvarcas, dolomitas, kaolinas, albitas,
mikroklinas, muskovitas, mulitas, hematitas, rutilas, diopsidas,
korundas, titanitas, natrio anortitas.... [toliau žr. visą
tekstą]
Advisors/Committee Members: Padarauskas, Audrius (Doctoral dissertation committee chair), Barkauskas, Jurgis (Doctoral dissertation committee member), Ramanauskas, Rimantas (Doctoral dissertation committee member), Jurkonienė, Sigita (Doctoral dissertation committee member), Lukšienė, Benedikta (Doctoral dissertation committee member), Vičkačkaitė, Vida (Doctoral dissertation opponent), Naujalis, Evaldas (Doctoral dissertation opponent), Tautkus, Stasys (Doctoral dissertation advisor).
Subjects/Keywords: Ceramics; XRD; SEM; IR; Thermal
analysis; Keramika; XRD; SEM; IR; Terminė
analizė
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APA (6th Edition):
Krapukaitytė, A. (2009). Investigation and description of modern and
archeological ceramics. (Doctoral Dissertation). Vilnius University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154440-91021 ;
Chicago Manual of Style (16th Edition):
Krapukaitytė, Aušra. “Investigation and description of modern and
archeological ceramics.” 2009. Doctoral Dissertation, Vilnius University. Accessed February 26, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154440-91021 ;.
MLA Handbook (7th Edition):
Krapukaitytė, Aušra. “Investigation and description of modern and
archeological ceramics.” 2009. Web. 26 Feb 2021.
Vancouver:
Krapukaitytė A. Investigation and description of modern and
archeological ceramics. [Internet] [Doctoral dissertation]. Vilnius University; 2009. [cited 2021 Feb 26].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154440-91021 ;.
Council of Science Editors:
Krapukaitytė A. Investigation and description of modern and
archeological ceramics. [Doctoral Dissertation]. Vilnius University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090707_154440-91021 ;
Brigham Young University
27.
Hancock, Jared M.
Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles.
Degree: PhD, 2013, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4866&context=etd
► In this dissertation, methods to synthesize ZnO are reported. First, zinc oxide nanoparticles were synthesized with small amounts of transition metal ions to create materials…
(more)
▼ In this dissertation, methods to synthesize ZnO are reported. First, zinc oxide nanoparticles were synthesized with small amounts of transition metal ions to create materials called dilute magnetic semiconductors (DMS). We employed a low temperature sol-gel method that produces ZnO nanoparticles of reproducible size and incorporates cobalt, nickel, and manganese ions into the nanoparticles. Conditions were controlled such that a range of amounts of Co, Ni, and Mn were incorporated. The incorporation was tracked by color changes in the white ZnO powder to blue for Co, green for Ni and yellow for Mn. XRD measurements showed the nanoparticles were on the order of 10 nm in diameter and had a wurtzite structure. Magnetic measurements showed a change from diamagnetic to paramagnetic behavior with increasing concentration of metal dopants. Second, formation of ZnO single crystal hexagonal prisms from a sol-gel method is presented. The method required water, zinc acetate, and ethanolamine to create a gel of zinc hydroxide and zinc hydroxide acetate, which upon heating formed single crystal hexagonal prisms. Characterization of the gel was done by XRD as well as XRD high temperature chamber (HTK) to determine the role of temperature in prism formation. SEM images showed hexagonal prisms were of uniform size (0.5 × 2 µm.) TEM and electron diffraction images showed a change from randomly oriented particles to an ordered single crystal after heating. Water and the acetate salt of zinc proved to be critical to prism formation. Lastly, we report absorption and fluorescence properties of synthesized oligothiophenes and oligothiophene-ruthenium complexes that are bound to CdSe nanoparticles. Their ability to act as sensitizers and charge transfer junctions was tested. It was found that fluorescence of CdSe nanoparticles was quenched when they were bound to the oligothiophenes, and that the fluorescence of the oligothiophenes was also quenched. The fluorescence lifetimes of the quenched species were shortened.
Subjects/Keywords: ZnO; nanoparticles; hexagonal prims; sol-gel; SEM; TEM; XRD; XRD-HTK; VSM; CdSe; Biochemistry; Chemistry
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APA (6th Edition):
Hancock, J. M. (2013). Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles. (Doctoral Dissertation). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4866&context=etd
Chicago Manual of Style (16th Edition):
Hancock, Jared M. “Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles.” 2013. Doctoral Dissertation, Brigham Young University. Accessed February 26, 2021.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4866&context=etd.
MLA Handbook (7th Edition):
Hancock, Jared M. “Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles.” 2013. Web. 26 Feb 2021.
Vancouver:
Hancock JM. Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles. [Internet] [Doctoral dissertation]. Brigham Young University; 2013. [cited 2021 Feb 26].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4866&context=etd.
Council of Science Editors:
Hancock JM. Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles. [Doctoral Dissertation]. Brigham Young University; 2013. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4866&context=etd
Brno University of Technology
28.
Duda, Štěpán.
Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders.
Degree: 2018, Brno University of Technology
URL: http://hdl.handle.net/11012/70370
► Presented diploma thesis is dealing with study of exciters of anhydrite binders. Theoretical part is dedicated to study of available domestic and foreign literature on…
(more)
▼ Presented diploma thesis is dealing with study of exciters of anhydrite binders. Theoretical part is dedicated to study of available domestic and foreign literature on a given topic. Attention is also paid to the study of the current research at the institute of THD. In the experimental part is developed a proposal of potential exciters of hydration on the basis of literature and according to the results of the research at the institute of THD. Next is proposed the methodological concept of the work. Testing of the monitored technological features follows. The study of the hydration process was recorded using
XRD analysis and thermal analysis. Evaluation of the results was implemented by the mutual comparing of prepared recipes.
Advisors/Committee Members: Gazdič, Dominik (advisor), Vavrušková,, Lenka (referee).
Subjects/Keywords: Anhydrit; budič hydratace; XRD analýza; termická analýza; Anhydrite; hydration exciter; XRD analysis; termal analysis
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APA ·
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APA (6th Edition):
Duda, . (2018). Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/70370
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Duda, Štěpán. “Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders.” 2018. Thesis, Brno University of Technology. Accessed February 26, 2021.
http://hdl.handle.net/11012/70370.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Duda, Štěpán. “Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders.” 2018. Web. 26 Feb 2021.
Vancouver:
Duda . Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/11012/70370.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Duda . Studium budičů anhydritových maltovin: Study of Exciters of Anhydrite Binders. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/70370
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
29.
Smejkal, Jan.
Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry.
Degree: 2018, Brno University of Technology
URL: http://hdl.handle.net/11012/68279
► Bachelor thesis studies effect of the selected organic additives on zinc deposit properties in relation to negative electrode for Ni-Zn battery. All additives were examined…
(more)
▼ Bachelor thesis studies effect of the selected organic additives on zinc deposit properties in relation to negative electrode for Ni-Zn battery. All additives were examined with emphasis on the study of dendritic and mossy structure growth suppression at low, middle and high current densities. Additives have been selected in order to their already known benefits for Ni-Zn cell and in order to their using in galvanic production. Additives were examined by
XRD diffractometer Rigaku Miniflex 600 HR and electron mi-croscope Tescan Vega 3 XMU.
Advisors/Committee Members: Chladil, Ladislav (advisor), Čech, Ondřej (referee).
Subjects/Keywords: Ni – Zn; depozice; morfologie; XRD; Rigaku; Ni – Zn; deposition; morphology; XRD; Rigaku
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APA ·
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APA (6th Edition):
Smejkal, J. (2018). Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/68279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smejkal, Jan. “Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry.” 2018. Thesis, Brno University of Technology. Accessed February 26, 2021.
http://hdl.handle.net/11012/68279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smejkal, Jan. “Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry.” 2018. Web. 26 Feb 2021.
Vancouver:
Smejkal J. Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/11012/68279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smejkal J. Studium vlivu organických aditiv na deposici zinku z alkalického elektrolytu s využitím rentgenové difraktometrie: Study of effect of organic additives on the zinc deposition in alkaline electrolytes using X-ray difraktometry. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/68279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
30.
Kaválek, Ondřej.
Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/18218
The diploma thesis deals with researching electrodeposition of silicon in anhydrous solutions. As electrolyte was used EC:DMC (1:1) with (C2H5)4NBF4, LiPF6 and LiClO4. Research was measured by cyclic voltammetry and XRD.
Advisors/Committee Members: Sedlaříková, Marie (advisor), Vondrák, Jiří (referee).Subjects/Keywords: Křemík; elektrodepozice; cyklická voltametrie; XRD difrakční analýza; rukavicový box; Silicon; Electrodeposition; Cyclic Voltammetry; XRD; Atmosbag
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APA ·
Chicago ·
MLA ·
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Manager
APA (6th Edition):
Kaválek, O. (2019). Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/18218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kaválek, Ondřej. “Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents.” 2019. Thesis, Brno University of Technology. Accessed February 26, 2021.
http://hdl.handle.net/11012/18218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kaválek, Ondřej. “Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents.” 2019. Web. 26 Feb 2021.
Vancouver:
Kaválek O. Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Feb 26].
Available from: http://hdl.handle.net/11012/18218.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kaválek O. Elektrochemická depozice křemíku z organických sloučenin: Electrochemical deposition of silicone from organic solvents. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/18218
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
