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Florida State University
1.
Smithyman, Jesse.
Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.
Degree: MS, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 
;
► The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles…
(more)
▼ The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles and the increased mobility of portable electronics. This research takes a unique approach to the improvement of EES devices through the investigation of a novel nanocomposite system to improve the performance of particle based electrodes. The majority of commercially available batteries and ECs have electrodes fabricated from a powder of fine particles (typically with particle sizes on the order of several µms). There is a severe lack of options for transforming these powders into usable electrodes. The traditional electrode fabrication method is to mix the active material powder with a polymer binder to form a sheet or film, which can then be implemented into the device. However, reliance on and incorporation of the polymer binder introduces several disadvantages and performance limitations. In this research, porous networks of carbon nanotubes (CNTs) are investigated to replace the polymer binder in the fabrication of particle based electrodes for electrochemical devices. The multifunctional CNT networks provide the supporting structure and electron conduction pathways to create freestanding and flexible composite electrodes with high electrical conductivities (50 - 100+ S/cm). Two case studies were carried out to explore the properties and performance of the new electrode structure: 1) Activated carbon (aC) particle based electrodes for electrochemical capacitors and 2) Silicon (Si) particle based electrodes for lithium-ion batteries. Samples were fabricated and characterized with an emphasis on obtaining processing-structure-property relationships to guide further development of these unique nanocomposite materials. The aC-CNT electrodes showed specific capacitances of ~50 F/g (in 6M KOH) with less than 10% capacitance loss after 30,000 cycles; demonstrating the ability of the CNT networks to maintain structural integrity during operational conditions. Si-CNT electrodes had high coulombic efficiencies (> 90%) and initial reversible capacities of over 2000 mAh/g. Additionally, fundamental issues are addressed such as possible electrode failure mechanisms and the limits of particle weight fractions that are achievable. Knowledge of the maximum weight fraction of particles obtainable within the CNT networks is important to determine the feasibility of the electrodes for commercial use. A volume-fraction-limited phenomenon is proposed for the mechanism of the particle loading limit and discussed with supporting evidence.
A Thesis submitted to the The Graduate School in partial fulfillment of the requirements for the degree of Master of
Science.
Fall Semester, 2010.
November 12, 2010.
carbon nanotube, binder-free, nanocomposite, electrode, battery
Zhiyong Liang, Professor Directing Thesis; Tao Liu, Committee Member; Hsu-Pin Wang, Committee Member; Jianping Zheng, Committee Member.
Advisors/Committee Members: Zhiyong Liang (professor directing thesis), Tao Liu (committee member), Hsu-Pin Wang (committee member), Jianping Zheng (committee member).
Subjects/Keywords: Materials science; Materials; Materials science; Materials
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APA (6th Edition):
Smithyman, J. (2010). Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 ;
Chicago Manual of Style (16th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 ;.
MLA Handbook (7th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Web. 24 May 2018.
Vancouver:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Internet] [Masters thesis]. Florida State University; 2010. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 ;.
Council of Science Editors:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Masters Thesis]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 ;
Wright State University
2.
Levkulich, Nathan Charles.
An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V.
Degree: MSin Materials Science and Engineering
MSMSE, Materials Science and Engineering, 2017, Wright State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1515112797193544
► Selective laser melting (SLM) is an additive manufacturing (AM) process that gives rise to large thermal gradients and rapid cooling rates that lead to the…
(more)
▼ Selective laser melting (SLM) is an additive
manufacturing (AM) process that gives rise to large thermal
gradients and rapid cooling rates that lead to the development of
undesirable residual stress and distortion. In this work, a number
of different techniques (i.e., x-ray-diffraction, hole-drilling,
layer-removal, and contour) were utilized to establish the effect
of process parameters on residualstress development during SLM of
Ti-6Al-4V. The measurements indicated that higher laser power,
slower scan speed, smaller stripe width, reduced substrate
overhang, and reduced build plan area each reduce the level of
residual stress. In addition, the correlation between
microstructure, crystallographic texture, and residual stress were
investigated using electron backscatter diffraction (EBSD) and
backscatter electron (BSE) imaging. The experimental results from
this work provide a quantitative foundation for future simulations
of residual stress evolution during SLM and provide an informed
understanding of residual stress development that can be used for
process planning and improvement.
Advisors/Committee Members: Klingbeil, Nathan (Advisor).
Subjects/Keywords: Materials Science; materials science
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APA (6th Edition):
Levkulich, N. C. (2017). An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1515112797193544
Chicago Manual of Style (16th Edition):
Levkulich, Nathan Charles. “An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V.” 2017. Masters Thesis, Wright State University. Accessed May 24, 2018.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1515112797193544.
MLA Handbook (7th Edition):
Levkulich, Nathan Charles. “An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V.” 2017. Web. 24 May 2018.
Vancouver:
Levkulich NC. An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V. [Internet] [Masters thesis]. Wright State University; 2017. [cited 2018 May 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1515112797193544.
Council of Science Editors:
Levkulich NC. An Experimental Investigation of Residual Stress Development
during Selective Laser Melting of Ti-6Al-4V. [Masters Thesis]. Wright State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1515112797193544
Wright State University
3.
Yang, Jianping.
Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries.
Degree: MSin Materials Science and Engineering
MSMSE, Materials Science and Engineering, 2017, Wright State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright151550285784082
► New-generation low-emission transportation systems demand high-performance lithiumion (Li-ion) batteries with high safety insurance at broad operable temperatures. Highly conductive solid electrolyte is one of the…
(more)
▼ New-generation low-emission transportation systems
demand high-performance lithiumion (Li-ion) batteries with high
safety insurance at broad operable temperatures. Highly conductive
solid electrolyte is one of the key components for such
applications. The objective of this thesis is to synthesize and
characterize aluminum doped lithium titanium phosphate, i.e.
Li1+xAlxTi2-x(PO4)3 (LATP), one of the solid-state electrolytes for
potential applications to all solid-state lithium-ion batteries. In
this research, sol-gel method and onestep solid-state reaction
approaches were explored and critical processes were optimized
towards maximizing lithium ion conductivities at room temperature.
The impacts of the processing conditions on the structures,
morphologies, compositions of the LATP products, and lithium ion
conductions were presented. Particle growth kinetics and lithium
ion conduction mechanism were briefly discussed. The highest
conductivities of LATPs achieved via the sol-gel and solid-state
synthesis are 1.24E-04 S/cm and 1.86E-04 S/cm, respectively,
exhibiting the feasibilities of applying them to all-solid-state
Li-ion batteries.
Advisors/Committee Members: Huang, Hong (Advisor).
Subjects/Keywords: Materials Science; materials science
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APA (6th Edition):
Yang, J. (2017). Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright151550285784082
Chicago Manual of Style (16th Edition):
Yang, Jianping. “Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries.” 2017. Masters Thesis, Wright State University. Accessed May 24, 2018.
http://rave.ohiolink.edu/etdc/view?acc_num=wright151550285784082.
MLA Handbook (7th Edition):
Yang, Jianping. “Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries.” 2017. Web. 24 May 2018.
Vancouver:
Yang J. Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries. [Internet] [Masters thesis]. Wright State University; 2017. [cited 2018 May 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright151550285784082.
Council of Science Editors:
Yang J. Synthesis and Characterizations of Lithium Aluminum Titanium
Phosphate (Li1+xAlxTi2-x(PO4)3) Solid Electrolytes for
All-Solid-State Li-ion Batteries. [Masters Thesis]. Wright State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright151550285784082
The Ohio State University
4.
Bowers, Matthew.
Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.
Degree: PhD, Materials Science and Engineering, 2014, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
► Shape memory alloys have remarkable strain recovery properties that make them ideal candidates for many applications that include devices in the automotive, aerospace, medical, and…
(more)
▼ Shape memory alloys have remarkable strain recovery
properties that make them ideal candidates for many applications
that include devices in the automotive, aerospace, medical, and
MEMS industries. Although these
materials are widely used today,
their performance is hindered by poor dimensional stability
resulting from cyclic degradation of the martensitic transformation
behavior. This functional fatigue results in decreased work output
and cyclic accumulation of permanent strain. To date, few studies
have taken a fundamental approach to investigating the interaction
between plasticity and martensite growth and propagation, which is
vitally important to mitigating functional fatigue in future alloy
development. The current work focuses on understanding the
interplay of these deformation mechanisms in NiTi-based shape
memory alloys under a variety of different thermomechanical test
conditions.Micron-scale compression testing of NiTi shape memory
alloy single crystals is undertaken in an effort to probe the
mechanism of austenite dislocation generation. Mechanical testing
is paired with post mortem defect analysis via diffraction contrast
scanning transmission electron microscopy (STEM). Accompanied by
micromechanics-based modeling of local stresses surrounding a
martensite plate, these results demonstrate that the previously
existing martensite and resulting austenite dislocation
substructure are intimately related. A mechanism of
transformation-induced dislocation generation is described in
detail.A study of pure and load-biased thermal cycling of bulk
polycrystalline NiTi is done for comparison of the transformation
behavior and resultant defects to the stress-induced case. Post
mortem and in situ STEM characterization demonstrate unique defect
configurations in this test mode and STEM-based orientation mapping
reveals local crystal rotation with increasing thermal cycles.
Changes in both martensite and austenite microstructures are
explored. The results for several different thermomechanical
histories are discussed and a new mechanism of austenite grain
refinement is proposed with support from ab initio calculations and
crystallographic theory.
Advisors/Committee Members: Mills, Michael (Advisor).
Subjects/Keywords: Materials Science
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APA (6th Edition):
Bowers, M. (2014). Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
Chicago Manual of Style (16th Edition):
Bowers, Matthew. “Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.” 2014. Doctoral Dissertation, The Ohio State University. Accessed May 24, 2018.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766.
MLA Handbook (7th Edition):
Bowers, Matthew. “Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.” 2014. Web. 24 May 2018.
Vancouver:
Bowers M. Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. [Internet] [Doctoral dissertation]. The Ohio State University; 2014. [cited 2018 May 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766.
Council of Science Editors:
Bowers M. Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. [Doctoral Dissertation]. The Ohio State University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
5.
Francis, Victor.
Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/185
► Bio-fuels such as E85 (85% ethanol and 15% gasoline) are clean and cost effective alternative fuel sources. Their effects on the tribological performance of the…
(more)
▼ Bio-fuels such as E85 (85% ethanol and 15%
gasoline) are clean and cost effective alternative fuel sources.
Their effects on the tribological performance of the IC Al-Si
engine alloy needs to be investigated. This study explores the
ultra mild wear (UMW) mechanisms of an Al-12.6%Si alloy operating
under a mixture of E85 fuel and motor oil (5W30) blended at a 1:1
ratio and only engine oil using boundary lubricated condition. Wear
tests were conducted at room temperature using a pin-on-disk
configuration and 52100 steel balls counterface. They show that
samples lubricated with only engine oil and an engine oil E85 blend
exhibited similar UMW characteristics. Lower wear rates were
obtained when the engine oil was mixed with E85 fuel. Although the
oil residue layer is of reduced thickness it is tribologically
effective due to the formation of a protective tribochemical film
by the alcohol.
Advisors/Committee Members: Edrisy, Afsaneh (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Francis, V. (2011). Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/185
Chicago Manual of Style (16th Edition):
Francis, Victor. “Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.” 2011. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/185.
MLA Handbook (7th Edition):
Francis, Victor. “Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.” 2011. Web. 24 May 2018.
Vancouver:
Francis V. Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/185.
Council of Science Editors:
Francis V. Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/185
6.
Gali, Olufisayo.
The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/187
► The surface defects of aluminum alloys that have undergone high temperature processing are studied. The effects of rolling passes and forward speed on the generation…
(more)
▼ The surface defects of aluminum alloys that
have undergone high temperature processing are studied. The effects
of rolling passes and forward speed on the generation of a
disturbed layer on aluminum alloy sheet surfaces were investigated
with a hot rolling simulator. The results showed that by increasing
the forward speed and number of rolling passes, the localized shear
deformation became more pronounced on the surface. However, when
the two rolling passes were in opposite directions, the defects
induced by the localized shear deformation were embedded into the
aluminum surface. The use of WS2 as a solid lubricant in hot
forming of AA5083 aluminum alloy was also explored. The results
show that the method of WS2 application is crucial to its
performance. An aerosol WS2 spray was developed which recorded a
lower COF than BN and a WS2 coating sandblasted to the substrate.
WS2 also showed better durability regardless of application method
than BN.
Advisors/Committee Members: Riahi, Ahmadreza (Mechanical, Automotive and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Gali, O. (2011). The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/187
Chicago Manual of Style (16th Edition):
Gali, Olufisayo. “The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.” 2011. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/187.
MLA Handbook (7th Edition):
Gali, Olufisayo. “The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.” 2011. Web. 24 May 2018.
Vancouver:
Gali O. The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/187.
Council of Science Editors:
Gali O. The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/187
7.
Banerji, Anindya.
Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/172
► Mg matrix composites AM60-x% (Al2O3)f (x=9,11,26) were fabricated by Al2O3 fibre preform preparation and squeeze casting technique. Sliding wear behaviour of these composites were studied…
(more)
▼ Mg matrix composites AM60-x% (Al2O3)f
(x=9,11,26) were fabricated by Al2O3 fibre preform preparation and
squeeze casting technique. Sliding wear behaviour of these
composites were studied by conducting boundary lubricated
pin-on-disk tests under ultra-mild wear conditions at 25 ║C and 100
║C against AISI 52100 steel balls. The damage in AM60-9% (Al2O3)f
at 25 ║C occurred as follows: Al2O3 fibre fracture and
fragmentation, sinking in of the fragmented fibres leading to
decrease in fibre elevation, and damage to Mg matrix. The fibre
fracture and fragmentation process, leading towards damage to the
Mg matrix, was attributed to: i) high applied contact pressure, ii)
matrix hardening and, iii) high fibre length. Increasing the Al2O3
fibre volume content delayed the transition to higher rate of
material loss but inflicted greater damage to the counterface. At
100 ░C, the formation of an oil residue layer on the worn surfaces
delayed the wear transition.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Banerji, A. (2012). Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/172
Chicago Manual of Style (16th Edition):
Banerji, Anindya. “Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.” 2012. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/172.
MLA Handbook (7th Edition):
Banerji, Anindya. “Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.” 2012. Web. 24 May 2018.
Vancouver:
Banerji A. Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. [Internet] [Masters thesis]. National Library of Canada; 2012. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/172.
Council of Science Editors:
Banerji A. Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. [Masters Thesis]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/172
8.
Bekou, Jack.
Thin Film Metallization and Protective Top-Coat
Development.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/174
► This research involved an investigation to find an alternative technology to chrome plating. The proposed system used a plastics substrate, a metalized layer, and a…
(more)
▼ This research involved an investigation to
find an alternative technology to chrome plating. The proposed
system used a plastics substrate, a metalized layer, and a
protective top-coat. The interfaces between the layers are the
challenges and thus various experiments are conducted to examine
the different possibilities for each layer and find the most
suitable combination for the system meeting the appearance and
functional requirements. Various studies, using different
techniques such as scanning electron microscopy, energy-dispersive
X-ray spectroscopy, Fourier transform infrared spectroscopy and
profilometery have been presented to examine different failure
modes and identify the root cause of the failures. This analysis
was used to improve the system in the subsequent iterations. Two
systems were developed. System "A" consists of polycarbonate, a
stainless steel metalized layer, and a silicone based top-coat.
System "B" consists of polycarbonate, a stainless steel metalized
layer, an aluminum metalized layer and a silicone based
top-coat.
Advisors/Committee Members: Northwood, Derek (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Bekou, J. (2011). Thin Film Metallization and Protective Top-Coat
Development. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/174
Chicago Manual of Style (16th Edition):
Bekou, Jack. “Thin Film Metallization and Protective Top-Coat
Development.” 2011. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/174.
MLA Handbook (7th Edition):
Bekou, Jack. “Thin Film Metallization and Protective Top-Coat
Development.” 2011. Web. 24 May 2018.
Vancouver:
Bekou J. Thin Film Metallization and Protective Top-Coat
Development. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/174.
Council of Science Editors:
Bekou J. Thin Film Metallization and Protective Top-Coat
Development. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/174
9.
Das, Sarmistha.
Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.
Degree: PhD, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/456
► Material transfer and adhesion to die surface are major tribological issues encountered during hot-forming of aluminum and magnesium alloys, reducing process efficiency. This study aimed…
(more)
▼ Material transfer and adhesion to die surface
are major tribological issues encountered during hot-forming of
aluminum and magnesium alloys, reducing process efficiency. This
study aimed at understanding the tribological contact interface
generated between material and die surface under dynamic conditions
created by simultaneous effect of temperature and strain rate.
Micromechanisms of plastic deformation occurring under simulated
hot-forming conditions were identified and related to the
coefficient of friction (COF). Sliding contact experiments were
done using specially designed tribometer (operating temperature: 25
to 545░C, strain rate: 10
-3 to
10
-1s
-1). COF
of AA5083(Al-4.5%Mg-0.7%Mn) and AZ31(Mg-3%Al-0.7%Zn) alloys were
measured during their plastic deformation by the simultaneous
effect of temperature and strain rate. The as received and
plastically deformed surfaces were characterized using optical
interferometry, SEM, FIB and TEM. Additionally, the force required
to break the asperity junction formed at the first contact, or
junction strength, was measured for both
materials at different
temperatures.
Advisors/Committee Members: Alpas, A. (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Das, S. (2011). Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/456
Chicago Manual of Style (16th Edition):
Das, Sarmistha. “Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.” 2011. Doctoral Dissertation, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/456.
MLA Handbook (7th Edition):
Das, Sarmistha. “Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.” 2011. Web. 24 May 2018.
Vancouver:
Das S. Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. [Internet] [Doctoral dissertation]. National Library of Canada; 2011. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/456.
Council of Science Editors:
Das S. Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. [Doctoral Dissertation]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/456
10.
Bhowmick, Sukanta.
Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.
Degree: PhD, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/455
► The use of minimum quantity lubrication (MQL) machining, i.e. drilling and tapping of aluminum and magnesium alloys using very low quantities of cutting fluids was…
(more)
▼ The use of minimum quantity lubrication (MQL)
machining, i.e. drilling and tapping of aluminum and magnesium
alloys using very low quantities of cutting fluids was studied and
the MQL machining performance was compared to dry and conventional
flooded conditions. An experimental drilling station with an MQL
system was built to measure torque and thrust force responses.
Uncoated and diamond- like carbon (DLC) coated HSS drills were
tested against 319 Al and AZ91 alloys using 10-50 ml/h of distilled
water (H2O-MQL) and a fatty acid based MQL agent (FA-MQL). The
results indicated that H2O-MQL used in conjunction with
non-hydrogenated DLC (NH-DLC) coatings reduced the average torque
and thrust-force compared to dry cutting and achieved a performance
comparable with conventional flooded drilling. At least 103 holes
could be drilled using NH-DLC in H2O-MQL and uncoated HSS in FAMQL
in drilling of both 319 Al and AZ91. MQL drilling and tapping
provided a stable machining performance, which was evident from the
uniform torque and force patterns and also resulted in desirable
hole surface, thread quality and chip segments. The maximum
temperature generated in the workpiece during MQL machining was
lower than that observed in dry drilling and tapping, and
comparable to flooded conditions. The mechanical properties of the
material adjacent to drilled holes, as evaluated through plastic
strain and hardness measurements, revealed a notable softening in
case of dry drilling, with magnesium alloys exhibiting a
recrystallized grain zone, but not for MQL drilling. Softened
aluminum and magnesium promoted adhesion to the tools resulted
built-up edge formation and consequently high torques and
thrust-forces were generated. NH-DLC coatings low COF in H2O-MQL
against 319 Al (0.10) and AZ91 (0.12) compared to uncoated HSS
(0.63 and 0.65) limited the temperature increase during NHDLC in
H2O-MQL drilling and hence both torques and thrust forces were
effectively reduced.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Bhowmick, S. (2011). Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/455
Chicago Manual of Style (16th Edition):
Bhowmick, Sukanta. “Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.” 2011. Doctoral Dissertation, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/455.
MLA Handbook (7th Edition):
Bhowmick, Sukanta. “Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.” 2011. Web. 24 May 2018.
Vancouver:
Bhowmick S. Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. [Internet] [Doctoral dissertation]. National Library of Canada; 2011. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/455.
Council of Science Editors:
Bhowmick S. Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. [Doctoral Dissertation]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/455
11.
Ravi Narayan, Lakshmi.
Forming of Ferritic Stainless Steel Bipolar Plates.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/205
► The effect of temperature and lubrication on the stamping of ferritic stainless steel bipolar plates has been studied. Stamping of micro-scale bipolar plate channels in…
(more)
▼ The effect of temperature and lubrication on
the stamping of ferritic stainless steel bipolar plates has been
studied. Stamping of micro-scale bipolar plate channels in ferritic
stainless steel foils of 75 ╡m thickness was carried out at 25, 100
and 200 ░C with stamping loads varying between 36 and 56 kN,
without and with lubrication. In unlubricated stamping, high
contact friction between the sheet and the die caused strain
localisation that increased with stamping load and temperature, and
heavy surface damage was observed. Boron nitride, tungsten
disulphide and molybdenum disulphide were used as solid lubricants
in the process. No necking was observed at 200 ░C, the strain
distribution improved with temperature and the surface damage was
considerably reduced, although WS2 and MoS2 produced transfer
layers on the surfaces. MoS2-lubrication, 200 ░C and stamping loads
between 45 and 50 kN have been identified as the most suitable
conditions for this process.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Ravi Narayan, L. (2012). Forming of Ferritic Stainless Steel Bipolar Plates. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/205
Chicago Manual of Style (16th Edition):
Ravi Narayan, Lakshmi. “Forming of Ferritic Stainless Steel Bipolar Plates.” 2012. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/205.
MLA Handbook (7th Edition):
Ravi Narayan, Lakshmi. “Forming of Ferritic Stainless Steel Bipolar Plates.” 2012. Web. 24 May 2018.
Vancouver:
Ravi Narayan L. Forming of Ferritic Stainless Steel Bipolar Plates. [Internet] [Masters thesis]. National Library of Canada; 2012. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/205.
Council of Science Editors:
Ravi Narayan L. Forming of Ferritic Stainless Steel Bipolar Plates. [Masters Thesis]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/205
12.
Chen, Peisheng.
Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2013, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/4718
► The dry machining performance, microstructure and mechanical properties of hypoeutectic and hypereutectic Al-Si alloys modified with different amounts of Bi and Sn, and cast…
(more)
▼ The dry machining performance,
microstructure and mechanical properties of hypoeutectic and
hypereutectic Al-Si alloys modified with different amounts of Bi
and Sn, and cast at different cooling rates, were studied. The
measured cutting and thrust forces decreased with the addition of
Bi and Sn. These elements caused intense shear localization, and
promoted the formation of segmented chips, thereby improving the
dry machining performance. Also Bi and Sn melted and thus acted as
lubricants during dry turning. However, the mechanical properties
decreased with the addition of Sn, although Sn had no effect on the
Si morphology. Bi had no effect on the Si morphology when cast at
high cooling rates. The optimum amount of Bi addition was found to
be 0.5 % and this alloy cast under a high cooling rates of 26 °C/s,
improved the overall machining performance without compromising the
mechanical properties.
Advisors/Committee Members: Ahmet T. Alpas.
Subjects/Keywords: Materials science
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APA (6th Edition):
Chen, P. (2013). Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/4718
Chicago Manual of Style (16th Edition):
Chen, Peisheng. “Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.” 2013. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/4718.
MLA Handbook (7th Edition):
Chen, Peisheng. “Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.” 2013. Web. 24 May 2018.
Vancouver:
Chen P. Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. [Internet] [Masters thesis]. National Library of Canada; 2013. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/4718.
Council of Science Editors:
Chen P. Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. [Masters Thesis]. National Library of Canada; 2013. Available from: http://scholar.uwindsor.ca/etd/4718
13.
Peng, Zhijing.
Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2013, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/4764
► Plasma electrolytic oxidizing (PEO) is an advanced technique that has been used to deposit thick and hard ceramic coatings on aluminium (Al) alloys. This work…
(more)
▼ Plasma electrolytic oxidizing (PEO) is an
advanced technique that has been used to deposit thick and hard
ceramic coatings on aluminium (Al) alloys. This work was however to
use the PEO process to produce thin ceramic oxide coatings on an
A356 Al alloy for improving corrosion and wear resistance of the
alloy. Effects of current density and treatment time on surface
morphologies and thickness of the PEO coatings were investigated.
The improvement of galvanic corrosion properties of the coated A356
alloy vs. steel and carbon fibre were evaluated in E85 fuel or NaCl
environments. Tribological properties of the coatings were studied
with comparison to the uncoated A356 substrate and other
commercially-used engine bore
materials. The research results
indicated that the PEO coatings could have excellent tribological
and corrosion properties for aluminium engine
applications.
Advisors/Committee Members: Xueyuan Nie.
Subjects/Keywords: Materials science
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APA (6th Edition):
Peng, Z. (2013). Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/4764
Chicago Manual of Style (16th Edition):
Peng, Zhijing. “Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.” 2013. Masters Thesis, National Library of Canada. Accessed May 24, 2018.
http://scholar.uwindsor.ca/etd/4764.
MLA Handbook (7th Edition):
Peng, Zhijing. “Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.” 2013. Web. 24 May 2018.
Vancouver:
Peng Z. Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. [Internet] [Masters thesis]. National Library of Canada; 2013. [cited 2018 May 24].
Available from: http://scholar.uwindsor.ca/etd/4764.
Council of Science Editors:
Peng Z. Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. [Masters Thesis]. National Library of Canada; 2013. Available from: http://scholar.uwindsor.ca/etd/4764
14.
Scannell, Garth.
Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.
Degree: 2016, Rensselaer Polytechnic Institute
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
► The responses of structure and properties to composition and temperature have been investigated for glasses in TiO2-SiO2 and Na2O-TiO2-SiO2 systems. Additionally, the response of…
(more)
▼ The responses of structure and properties to composition and temperature have been investigated for glasses in TiO2-SiO2 and Na2O-TiO2-SiO2 systems. Additionally, the response of Na2O-TiO2-SiO2 glasses to plastic deformation has been studied. (x)TiO2-(1-x)SiO2 glasses were prepared through the sol-gel process with compositions 0 ≤ x ≤ 10 mol% and compared to commercial glasses prepared through flame hydrolysis deposition with x = 0, 5.4, and 8.3 mol%. (x) Na2O - (y) TiO 2 - (1-x-y) SiO2 glasses were prepared with x = 10, 15, 20, and 25 mol% and y = 4, 7, and 10 mol% through a melt-quench process. Density and index of refraction of glasses was measured through the Archimedes's method and using a prism coupler, respectively. The glass transition temperature of Na2O-TiO2-SiO2 glasses was measured through differential thermal analysis. The structure and elastic moduli have been studied through Raman spectroscopy and Brillouin light scattering, respectively, at room temperature and in-situ up to 1200 °C for TiO2-SiO2 glasses and up to 800 °C for Na2O-TiO2-SiO2 glasses. Young's modulus was observed to decrease from 72 GPa to 66 GPa with the addition of 8.3 mol% TiO2 in TiO2-SiO2 glasses and to increase from 65 GPa to 73 GPa with the addition of 10 mol% TiO2 in 10 Na2O - (0-10) TiO2-SiO2 glasses. The addition of TiO2 was observed to shift the 460, 490, and 600 cm-1 Raman peaks to lower frequencies in TiO2-SiO2 glasses, suggesting a more open and flexible network, and the 720, 800, and 840 cm -1 Raman peaks to higher frequencies in Na2O-TiO2 -SiO2 glasses, suggesting a lower free volume and stiffer network. The addition of TiO2 has little effect on the temperature response of the elastic moduli in either system, but decreases the thermal expansion and increases the frequency shifts in the 950 and 1100 cm -1 Raman peaks in the TiO2-SiO2 system while the thermal expansion increases with initial additions of TiO2 and then remains constant in the Na2O-TiO2-SiO 2 system. Changes in structure and property with composition have been discussed, and structural models were proposed. The reduction of thermal expansion and elastic moduli in TiO2-SiO2 glasses occurs through the promotion of cooperative, inter-tetrahedral rotations facilitated by the longer and weaker Ti-O bonds. The increase in elastic moduli in the Na2O-TiO 2-SiO2 glasses occurs through the formation of small clusters with local, relatively high Ti and Na concentrations, promoted by Ti adopting a five-fold…
Subjects/Keywords: Materials science
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APA (6th Edition):
Scannell, G. (2016). Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. (Thesis). Rensselaer Polytechnic Institute. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
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):
Scannell, Garth. “Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.” 2016. Thesis, Rensselaer Polytechnic Institute. Accessed May 24, 2018.
http://pqdtopen.proquest.com/#viewpdf?dispub=10158591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Scannell, Garth. “Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.” 2016. Web. 24 May 2018.
Vancouver:
Scannell G. Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. [Internet] [Thesis]. Rensselaer Polytechnic Institute; 2016. [cited 2018 May 24].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Scannell G. Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. [Thesis]. Rensselaer Polytechnic Institute; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Florida State University
15.
Okpowe, Omena.
Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt.
Degree: MS, Materials Science, 2017, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2017SP_Okpowe_fsu_0071N_13679
;
► The isothermal and non-isothermal crystallization kinetics of poly (propylene succinate) stereocomplex over a broad range of temperatures has been studied. Crystallization peaks from Differential Scanning…
(more)
▼ The isothermal and non-isothermal crystallization kinetics of poly (propylene succinate) stereocomplex over a broad range of temperatures has been studied. Crystallization peaks from Differential Scanning Calorimeter are only observed when cooling (at 10°C/min) from melt temperatures ~15 degrees above the observed melting peak due to self-seeding (heterogeneous melt). Annealing in this range of melt temperatures leads to a faster crystallization. This behavior is not found in analogs stereocomplexes of PLA, and is attributed to the interplay between dipolar interactions and diffusion of the enantiomeric helical sequences with formation of more nuclei with time in the melt. From a heterogeneous melt at low undercooling, the polymer displays a faster nucleation confined to the spherulitic boundaries, and then a growth with rate similar to that from a homogenous melt temperature. Linear spherulitic growth rates of the stereocomplex from a homogenous melt follow the classical bell shape crystallization temperature dependence peaking at 61ºC. The analysis of the growth rates according to secondary nucleation theory indicate two regimes of crystallization conforming to a transition from regime II to III. From the analysis, the nucleus basal surface free energy is estimated as ~ 55 ergs/cm2, in close agreement to values obtained for similar polyesters.
A Thesis submitted to the Program in Materials Science and Engineering in partial fulfillment of the Master of Science.
Spring Semester 2017.
April 10, 2017.
Rufina G. Alamo, Professor Directing Thesis; Eric Hellstrom, Committee Member; Hoyong Chung, Committee Member.
Advisors/Committee Members: Rufina G. Alamo (professor directing thesis), Eric Hellstrom (committee member), Hoyong Chung (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Okpowe, O. (2017). Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2017SP_Okpowe_fsu_0071N_13679 ;
Chicago Manual of Style (16th Edition):
Okpowe, Omena. “Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt.” 2017. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_2017SP_Okpowe_fsu_0071N_13679 ;.
MLA Handbook (7th Edition):
Okpowe, Omena. “Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt.” 2017. Web. 24 May 2018.
Vancouver:
Okpowe O. Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt. [Internet] [Masters thesis]. Florida State University; 2017. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Okpowe_fsu_0071N_13679 ;.
Council of Science Editors:
Okpowe O. Crystallization Behavior of Poly (Propylene Succinate) Stereocomplex from the Melt. [Masters Thesis]. Florida State University; 2017. Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Okpowe_fsu_0071N_13679 ;
Florida State University
16.
Liu, Teng.
Nanocarbon Foam: Fabrication, Characterization and Application.
Degree: MS, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966
;
► This thesis is a continuous effort contributed to the field of developing a new type of functional porous materials - Nanocarbon Foam (NCF) by crosslinking…
(more)
▼ This thesis is a continuous effort contributed to the field of developing a new type of functional porous materials - Nanocarbon Foam (NCF) by crosslinking multi-walled carbon
nanotubes (MWNTs) into networks in three-dimensional (3D). Synthetic routes and characterizations of NCF, and their applications as strain-gauge sensors and electrode materials in
lithium-air (Li-air) battery are described. In this research, the first accomplishment is proposing a robust methodology for creating superealstic 3D macroscopic NCF with controlled
cellular structure. The key contributions contain: (1) understanding the premise of the design that gives the NCF with desired structure and porosity; (2) designing fabrication protocol
for NCFs with controlled densities and macroscopic structure; (3) fabricating varied NCF with tunable porosity and structures, which in turn will endow the NCF with different
characteristics. This experimental methodology for systematic and quantitative investigation of the processing-structure relationships provides a means for the fabrication optimization of
NCF with desired structures. Though the mechanical, electronic, and thermal properties of CNTs have been extensively studied, for NCF that is a mixture of pristine and functionalized CNTs,
it will not only have the collective behavior of the individual tubes, but will also have properties generated from the interactions between the tubes and engineered components. To
understand the structure-properties relationship of NCF, the second accomplishment is studying the properties of obtained NCFs. Density, specific surface area, porosity, compressive
behavior, mechanical robustness, electrical and electromechanical properties of NCF have been characterized in details. For comparison, properties originated from cellular structures built
of other materials, such as polymeric foam, fiber aerogels, etc., are compared with that of NCF. Moreover, some engineering applications of NCF have been discussed. With the unique
features of NCFs, my proposed future work will focus on understanding porous structure formation and resulted unique properties by the means of scientific modelling. In addition, NCF will
be explored as the skeleton for fabricating hybrid systems.
A Thesis submitted to the Materials Science and Engineering Program in partial fulfillment of the Master of Science.
Fall Semester 2015.
November 5, 2015.
Eric Hellstrom, Professor Co-Directing Thesis; Mei Zhang, Professor Co-Directing Thesis; Richard Liang, Committee Member; Zhibin Yu, Committee
Member.
Advisors/Committee Members: Eric Hellstrom (professor co-directing thesis), Mei Zhang (professor co-directing thesis), Zhiyong (Richard) Liang (committee member), Zhibin Yu (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Liu, T. (2015). Nanocarbon Foam: Fabrication, Characterization and Application. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966 ;
Chicago Manual of Style (16th Edition):
Liu, Teng. “Nanocarbon Foam: Fabrication, Characterization and Application.” 2015. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966 ;.
MLA Handbook (7th Edition):
Liu, Teng. “Nanocarbon Foam: Fabrication, Characterization and Application.” 2015. Web. 24 May 2018.
Vancouver:
Liu T. Nanocarbon Foam: Fabrication, Characterization and Application. [Internet] [Masters thesis]. Florida State University; 2015. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966 ;.
Council of Science Editors:
Liu T. Nanocarbon Foam: Fabrication, Characterization and Application. [Masters Thesis]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966 ;
Florida State University
17.
Trayner, Sarah.
Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis.
Degree: MS, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8902
;
► As research progresses towards nanoscale materials, there has become a need for a more efficient and effective way to obtain ultra-thin samples for imaging under…
(more)
▼ As research progresses towards nanoscale materials, there has become a need for a more efficient and effective way to obtain ultra-thin samples for imaging under transmission electron microscope (TEM) for atomic resolution analysis. There are various methods used to obtain thin samples (<50 nm in thickness). However, most of the resultant TEM images of soft materials, such as CNT/epoxy composites, are of poor quality due to the sample cutting difficulties. Such poor quality samples are characterized by uneven sample thicknesses, objective overlapping, overall darkness due to large thickness, and defects such as cutting scratches. This research is a continuous effort to study and improve the ultra-microtome cutting technique to provide an effective and reliable approach of obtaining an ultra-thin (25-50 nm) cross section of a CNT/polymer composite for high resolution TEM analysis. Improvements were achieved by studying the relationships between the chosen cutting parameters, sample characteristics and TEM image quality. From this information, a cutting protocol was established so that ultra-thin sample slices can be achieved by different microtome operators for high resolution TEM analysis. In addition, a custom tool was created to aid in the sample collection process. In this research, three composite samples were studied for both microtome cutting and TEM analysis: 1) Unidirectional (UD) IM7/BMI composite; 2) Single-layer CNT buckypaper (BP)/ epoxy nanocomposite; 3) 3-layer CNT BP/BMI nanocomposite. The resultant TEM images revealed a clear microstructure consisting of amorphous resin and graphite crystalline packing. UD IM7/BMI composite TEM results did not reveal an interfacial region resulting in a need for even thinner sliced cross sections. TEM results for the single-layer CNT BP/epoxy nanocomposite revealed the alignment direction of the nanotubes and numerous stacks of CNT bundles. In addition, there was visible flattening of CNT packing into dumbbell shapes similar to results obtain by Alan Windle. TEM results for the 3-layer CNT BP/BMI nanocomposite revealed uniformly cut resin. However, when the diamond knife reached graphite crystalline regions, the nanotube either became deformed into a cone-like structure, was cut at a thicker thickness than the resin, or folded over onto itself. This is most likely a result of the nanotubes high mechanical properties in response to the stress of cutting.
A Thesis submitted to the Material Science and Engineering Program in partial fulfillment of the requirements for the degree of Master of Science.
Spring Semester, 2014.
April 11, 2014.
Carbon Nanotube, Nanocomposites, TEM, Ultra Microtome
Richard Liang, Professor Directing Thesis; Okenwa Okoli, Committee Member; Mei Zhang, Committee Member.
Advisors/Committee Members: Richard Liang (professor directing thesis), Okenwa Okoli (committee member), Mei Zhang (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Trayner, S. (2014). Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8902 ;
Chicago Manual of Style (16th Edition):
Trayner, Sarah. “Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis.” 2014. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-8902 ;.
MLA Handbook (7th Edition):
Trayner, Sarah. “Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis.” 2014. Web. 24 May 2018.
Vancouver:
Trayner S. Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis. [Internet] [Masters thesis]. Florida State University; 2014. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8902 ;.
Council of Science Editors:
Trayner S. Improvement of Microtome Cutting Process of Carbon Nanotube Composite Sample Preparation for TEM Analysis. [Masters Thesis]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8902 ;
Florida State University
18.
Harper, Tristan.
Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.
Degree: MS, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984
;
► A bio-inspired, modular terpolymer adhesive has been synthesized containing three different functionalities: a photocrosslinking segment, wet adhesion segment, and a water soluble segment. Wet adhesion…
(more)
▼ A bio-inspired, modular terpolymer adhesive has been synthesized containing three different functionalities: a photocrosslinking segment, wet adhesion segment, and a water soluble
segment. Wet adhesion is brought on by an amino acid from mussel byssal plaques called 3,4-dihydroxyphenyl–L-alanine, which has been known to generate strong bonding under wet conditions.
The photocrosslinking segment consists of an anthracene based monomer used for mechanical fortification of polymer chains. The water soluble segment consists of poly(acrylic acid), which
has been known to increase water solubility of polymers and increase adhesion strength of adhesives. The terpolymer was designed to easily applicable using biologically friendly solvents
including water and ethanol. Structural design was confirmed by NMR and UV-Vis spectroscopy. Reversible cycloaddition reactions were executed using a handheld UV lamp along with a
photoreactor. Molecular weight increases were seen from 4.120 x 10⁴ Da to 7.429 x 10⁴ Da. Lap shear strength testing showed effects of UV exposure through increases in adhesion energy
above 450%. Multiple application variables were tested to determine optimal conditions, such as solvent, concentration, and substrate. Currently, optimal conditions show a 1:1 weight ratio
of polymer:solvent in water for all surfaces.
A Thesis submitted to the Materials Science and Engineering Program in partial fulfillment of the requirements for the degree of Master of Science.
Fall Semester 2015.
November 5, 2015.
Adhesives, Anthracene, Biomimetic, DOPA, Photo-crosslinking, Terpolymer
Hoyong Chung, Professor Directing Thesis; Justin Kennemur, Committee Member; William Oates, Committee Member.
Advisors/Committee Members: Hoyong Chung (professor directing thesis), Justin G. Kennemur (committee member), William S. Oates (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Harper, T. (2015). Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984 ;
Chicago Manual of Style (16th Edition):
Harper, Tristan. “Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.” 2015. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984 ;.
MLA Handbook (7th Edition):
Harper, Tristan. “Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.” 2015. Web. 24 May 2018.
Vancouver:
Harper T. Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. [Internet] [Masters thesis]. Florida State University; 2015. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984 ;.
Council of Science Editors:
Harper T. Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. [Masters Thesis]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984 ;
Florida State University
19.
Ahmed, Karim.
Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.
Degree: MS, 2011, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684
;
► The development of robust thermal barrier coating (TBC) systems is crucial in many high-temperature applications. The performance of a TBC system is significantly limited by…
(more)
▼ The development of robust thermal barrier coating (TBC) systems is crucial in many high-temperature applications. The performance of a TBC system is significantly limited by microstructural evolution mechanisms, such as sintering at elevated temperatures. Sintering reduces the porosity of TBC and makes it denser which eventually increases the thermal conductivity and reduces the strain compliance of TBC. Understanding how sintering proceeds in TBC systems is thus important in improving the design of such systems. An elaborate phase field model was developed in order to understand the sintering behavior of columnar TBC structure. The model takes into account different sintering mechanisms, such as volume diffusion, grain boundary diffusion, surface diffusion, and grain boundary migration, coupled with elastic strain arising from the thermal expansion mismatch in thermal barrier coating system. Direct relations between model parameters and material properties were established. Such relations facilitate quantitative studies of the sintering process in any material of interest. The model successfully demonstrates a strong dependence of the sintering process in TBC on the initial morphology and dimensions of coatings, strain, and temperature.
A Thesis submitted to the Graduate School in partial fulfillment of the requirements for the degree of Master of Science.
Fall Semester, 2011.
October 27, 2011.
Microstructure Evolution, Phase Field Model, Sintering, Thermal Barrier Coatings
Anter El-Azab, Professor Directing Thesis; Anke Meyer-Baese, Committee Member; Sachin Shanbhag, Committee Member; Xiaoqiang Wang, Committee Member.
Advisors/Committee Members: Anter El-Azab (professor directing thesis), Anke Meyer-Baese (committee member), Sachin Shanbhag (committee member), Xiaoqiang Wang (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Ahmed, K. (2011). Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684 ;
Chicago Manual of Style (16th Edition):
Ahmed, Karim. “Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.” 2011. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684 ;.
MLA Handbook (7th Edition):
Ahmed, Karim. “Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.” 2011. Web. 24 May 2018.
Vancouver:
Ahmed K. Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. [Internet] [Masters thesis]. Florida State University; 2011. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684 ;.
Council of Science Editors:
Ahmed K. Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. [Masters Thesis]. Florida State University; 2011. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684 ;
Florida State University
20.
Lombardo, Rafael Vasquez.
Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246
;
► The narrow band gap semiconductor iron antimonide, FeSb2, has been grown as bulk single crystals, and investigated for its electronic and magnetic properties at low…
(more)
▼ The narrow band gap semiconductor iron antimonide, FeSb2, has been grown as bulk single crystals, and investigated for its electronic and magnetic properties at low temperatures. The electronic behavior of FeSb2 is associated with strong electron correlations, similar to the characteristic behavior observed in FeSi, another strongly correlated d-electron correlated semiconductor. Recent studies found an enhancement of the Seebeck coefficient and thermopower, two key parameters in thermoelectric performance, at temperatures below 77K, making FeSb2 potentially useful in cryogenic Peltier-cooling applications below liquid nitrogen temperatures. Crystals with sizes of 1.5-5.0 mm are grown using three different synthesis approaches: chemical vapor-phase transport (CVT), using either chlorine (Cl2(g)) or iodine (I2(g)) as transporting agents, and molten flux growth using excess antimony (Sb). Single crystal and powder x-ray diffraction experiments on select samples provided for structural phase identification and confirmed the absence of secondary impurity phases. FeSb2 crystallizes in the FeS2-marcasite structure type, featuring FeSb6 edge-sharing octahedra forming chains along the c-axis and corner-sharing in the a-b plane. The crystal surfaces were characterized using SEM-EDS and AFM measurements, revealing the characteristic morphological features resulting from CVT growth, as well as helping to identify surface contamination. Magnetic susceptibility measurements show weak temperature induced paramagnetism above 50K, with the diamagnetic-to-paramagnetic crossover above 100K. Temperature-dependent electronic transport properties, ρ(T), showed semiconducting behavior and the formation of a resistivity plateau between 10K-40K, corresponding to a secondary transport gap, εg, of about 3.9-7.2meV, similar in magnitude and in accordance to previous studies on FeSb2. Hybridization between iron (Fe) 3d and antimony (Sb) 5p and 5s valence states appears to be responsible for complex electronic behavior at low temperatures, with the formation of a small secondary gap. Earlier studies have shown a significant enhancement of the Seebeck coefficient (thermopower) at the onset of this gap (10K-12K). Thermopower measurements in our sample also show peak values around this temperature, but the maximum values are several orders of magnitude lower than previous reports, while magnetic and electronic properties are in good agreement.
A Thesis submitted to the Interdisciplinary Program in Materials Science in partial fulfillment of the requirements for the degree of Master of Science.
Summer Semester, 2012.
May 22, 2012.
Correlated Systems, FeSb2, FeSi, Peltier cooling, Seebeck Coefficient, Thermoelectrics
Theo Siegrist, Professor Directing Thesis; Eric Hellstrom, Committee Member; James Brooks, Committee Member.
Advisors/Committee Members: Theo Siegrist (professor directing thesis), Eric Hellstrom (committee member), James Brooks (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Lombardo, R. V. (2012). Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246 ;
Chicago Manual of Style (16th Edition):
Lombardo, Rafael Vasquez. “Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.” 2012. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246 ;.
MLA Handbook (7th Edition):
Lombardo, Rafael Vasquez. “Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.” 2012. Web. 24 May 2018.
Vancouver:
Lombardo RV. Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246 ;.
Council of Science Editors:
Lombardo RV. Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246 ;
Florida State University
21.
Hassan, Abdel-Rahman.
Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.
Degree: MS, 2011, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896
;
► Irradiation alters the local stoichiometry of oxides significantly. The resulting stoichiometric changes play a critical role in the dynamics of defects and microstructure evolution in…
(more)
▼ Irradiation alters the local stoichiometry of oxides significantly. The resulting stoichiometric changes play a critical role in the dynamics of defects and microstructure evolution in oxides under irradiation. Stoichiometry in oxides is also sensitive to the surrounding oxygen environment. Motivated to study the equilibrium state of UO2, this thesis investigates a theoretical approach to model spatial distribution of defects and charge carriers. In general, the levels of point defects and electronic charge carriers in an oxide are sensitive to the oxygen partial pressure in contact with the oxide and temperature. The objective of this research is twofolded. First, a detailed point defect model based on density functional theory results is devised. The model takes into account multiple charge states for each defect type as well as all the dependencies of the formation thereof. Second, a space-charge analysis is used to find the effect of surface and environment on the spatial variation of concentrations at equilibrium. A surface charge is known to form on the surface as a result of its interaction with the environment. This interaction is explained by the theory of ionosorption. The resulting effect is found by coupling bulk concentrations from the point defect model with the surface charge through solving the electrochemical sytem. The results found by the point defect model are shown to match the experimental data on UO2±x . As for the space-charge analysis, the concentrations of individual defects showed an order of magnitude variation in the subsurface region. This implies the importance of the space-charge effect in any kinetic study of the system since it is controlled by the defect composition at the interface.
A Thesis submitted to the Materials Science and Engineering Program in partial fulfillment of the requirements for the degree of Master of Science.
Fall Semester, 2011.
November 7, 2011.
Anter El-Azab, Professor Directing Thesis; Petru Andrei, Committee Member; Milen Kostov, Committee Member.
Advisors/Committee Members: Anter El-Azab (professor directing thesis), Petru Andrei (committee member), Milen Kostov (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Hassan, A. (2011). Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896 ;
Chicago Manual of Style (16th Edition):
Hassan, Abdel-Rahman. “Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.” 2011. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896 ;.
MLA Handbook (7th Edition):
Hassan, Abdel-Rahman. “Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.” 2011. Web. 24 May 2018.
Vancouver:
Hassan A. Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. [Internet] [Masters thesis]. Florida State University; 2011. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896 ;.
Council of Science Editors:
Hassan A. Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. [Masters Thesis]. Florida State University; 2011. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896 ;
Florida State University
22.
Smithyman, Jesse.
Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.
Degree: MS, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232
;
► The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles…
(more)
▼ The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles and the increased mobility of portable electronics. This research takes a unique approach to the improvement of EES devices through the investigation of a novel nanocomposite system to improve the performance of particle based electrodes. The majority of commercially available batteries and ECs have electrodes fabricated from a powder of fine particles (typically with particle sizes on the order of several 'ms). There is a severe lack of options for transforming these powders into usable electrodes. The traditional electrode fabrication method is to mix the active material powder with a polymer binder to form a sheet or film, which can then be implemented into the device. However, reliance on and incorporation of the polymer binder introduces several disadvantages and performance limitations. In this research, porous networks of carbon nanotubes (CNTs) are investigated to replace the polymer binder in the fabrication of particle based electrodes for electrochemical devices. The multifunctional CNT networks provide the supporting structure and electron conduction pathways to create freestanding and flexible composite electrodes with high electrical conductivities (50 - 100+ S/cm). Two case studies were carried out to explore the properties and performance of the new electrode structure: 1) Activated carbon (aC) particle based electrodes for electrochemical capacitors and 2) Silicon (Si) particle based electrodes for lithium-ion batteries. Samples were fabricated and characterized with an emphasis on obtaining processing-structure-property relationships to guide further development of these unique nanocomposite materials. The aC-CNT electrodes showed specific capacitances of ~50 F/g (in 6M KOH) with less than 10% capacitance loss after 30,000 cycles; demonstrating the ability of the CNT networks to maintain structural integrity during operational conditions. Si-CNT electrodes had high coulombic efficiencies (> 90%) and initial reversible capacities of over 2000 mAh/g. Additionally, fundamental issues are addressed such as possible electrode failure mechanisms and the limits of particle weight fractions that are achievable. Knowledge of the maximum weight fraction of particles obtainable within the CNT networks is important to determine the feasibility of the electrodes for commercial use. A volume-fraction-limited phenomenon is proposed for the mechanism of the particle loading limit and discussed with supporting evidence.
A Thesis submitted to the The Graduate School in partial fulfillment of the requirements for the degree of Master
of Science.
Fall Semester, 2010.
November 12, 2010.
Zhiyong Liang, Professor Directing Thesis; Tao Liu, Committee Member; Hsu-Pin Wang, Committee Member; Jianping Zheng, Committee Member.
Advisors/Committee Members: Zhiyong Liang (professor directing thesis), Tao Liu (committee member), Hsu-Pin Wang (committee member), Jianping Zheng (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Smithyman, J. (2010). Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232 ;
Chicago Manual of Style (16th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232 ;.
MLA Handbook (7th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Web. 24 May 2018.
Vancouver:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Internet] [Masters thesis]. Florida State University; 2010. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232 ;.
Council of Science Editors:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Masters Thesis]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232 ;
Florida State University
23.
Wright, Katheryn.
Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.
Degree: PhD, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257
;
► This dissertation explores the formation and significance of the screenscape in popular culture. A screenscape encompasses the mixture of screens and bodies that enter into…
(more)
▼ This dissertation explores the formation and significance of the screenscape in popular culture. A screenscape encompasses the mixture of screens and bodies that enter into and transform the aesthetic quality of social space. After reviewing types of screens that might comprise a given screenscape, I approach the screen not only as a technology but a cultural form that influences the way audiences perceive the relationship between media and their environments. As such, I expand Brian Massumi's reading of the production of fear through the television after 9/11 and argue that the screen is a space of and for the collective modulation of affect. My argument hinges on three interlocking concepts: the screen as threshold, the affective body, and the biopolitical population. While new media theorists Lev Manovich and Anne Friedberg position the screen as a frame for onscreen content, the first chapter concludes by outlining how the screen also functions as a threshold, a critical point or site of transition. The second chapter defines the affective body and biopolitical population, linking the two through the collective modulation of affect. Each of the final three chapters focuses on a specific example, weaving together the concepts of the screen as threshold, affective body, and biopolitical population through the construction of the screenscape. I analyze the television series Dollhouse as a metaphor of the screen as a threshold. The narrative positions the primary character, Echo (Eliza Dushku), as a screen ' a site for display rather than an object on display. She simultaneously represents both the affective body and the biopolitical population. Next I turn to Nine Inch Nail's Lights in the Sky tour. Trent Reznor, the visionary behind Nine Inch Nails, stands for the fantasy of the artist who surrenders his body to the onstage screenscape he finances and designs. Reznor's playful interactions with the three 'stealth' screens enable his body to be controlled and secured by the logic of the screenscape as it expands beyond his control. My final discussion takes an ethnographic approach to the study of the screen at the 2008 US Open in New York. This sporting attraction and entertainment spectacle brings together a variety of screens ranging from video boards to handheld televisions. Here, the enormity of the event is expressed through the personal, affective relationships people have with their screen technologies. At the same time, the arrangement of screens across the venue help to manage crowds, control access, and corporately brand an event in its becoming. These readings hinge on a paradox embedded in the screen as a cultural form: to enter into the screenscape means to affect and be affected by the biopolitical population as it weaves into and informs the logic of cultural production and consumption.
A Dissertation submitted to the Program in Interdisciplinary Humanities in partial fulfillment of the
requirements for the degree of Doctor of Philosophy.
Spring Semester, 2010.
March 26,…
Advisors/Committee Members: Amit Rai (professor directing dissertation), Andy Opel (university representative), Leigh Edwards (committee member), Kathleen Yancey (committee member).
Subjects/Keywords: Materials science
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APA ·
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APA (6th Edition):
Wright, K. (2010). Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257 ;
Chicago Manual of Style (16th Edition):
Wright, Katheryn. “Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.” 2010. Doctoral Dissertation, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257 ;.
MLA Handbook (7th Edition):
Wright, Katheryn. “Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.” 2010. Web. 24 May 2018.
Vancouver:
Wright K. Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257 ;.
Council of Science Editors:
Wright K. Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257 ;
Florida State University
24.
Tran, Hoang Phong.
Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance.
Degree: PhD, Industrial and Manufacturing Engineering, 2016, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_FA2016_Tran_fsu_0071E_13515
;
► Nanomaterials are small structures that have at least one dimension less than ~100 nanometers. Depending on the number of dimensions that are not confined to…
(more)
▼ Nanomaterials are small structures that have at least one dimension less than ~100 nanometers. Depending on the number of
dimensions that are not confined to the nanoscale range, nanomaterials can be classified into 0D, 1D and 2D types. Due to their small
sizes, nanoparticles possess exceptional physical and chemical properties which opens a unique possibility for the next generation of
strain sensors that are cheap, multifunctional, high sensitivity and reliability. Over the years, thanks to the development of new
nanomaterials and the printing technologies, a number of printing techniques have been developed to fabricate a wide range of electronic
devices on diverse substrates. Nanomaterials based thin film devices can be readily patterned and fabricated in a variety of ways,
including printing, spraying and laser direct writing. In this work, we review the piezoresistivity of nanomaterials of different
categories and study various printing approaches to utilize their excellent properties in the fabrication of scalable and printable thin
film strain gauges. CNT-AgNP composite thin films were fabricated using a solution based screen printing process. By controlling the
concentration ratio of CNTs to AgNPs in the nanocomposites and the supporting substrates, we were able to engineer the crack formation to
achieve stable and high sensitivity sensors. The crack formation in the composite films lead to piezoresistive sensors with high GFs up to
221.2. Also, with a simple, low cost, and easy to scale up fabrication process they may find use as an alternative to traditional strain
sensors. By using computer controlled spray coating system, we can achieve uniform and high quality CNTs thin films for the fabrication of
strain sensors and transparent / flexible electrodes. A simple diazonium salt treatment of the pristine SWCNT thin film has been
identified to be efficient in greatly enhancing the piezoresistive sensitivity of SWCNT thin film based piezoresistive sensors. The
coupled mechanical stretching and Raman band shift characterization provides strong evidence to support this point of view. The same
approach should be applicable to other types of carbon based strain sensors for improving their sensitivity. The direct laser writing
(DLW) method has been used for producing flexible piezoresistive sensor and sensor arrays on polyimide film substrates. The effect of CO2
laser irradiation conditions on the morphology, chemical composition and piezoresistivity of the formed graphitic line features were
systematically studied to establish the related processing-structure-property relationship. The DLW generated sensors have been
demonstrated for their use as strain gauges for structural health monitoring of polymeric composites, and as flexible and wearable sensors
of gesture…
Advisors/Committee Members: Zhibin Yu (professor co-directing dissertation), Tao (Ted) Liu (professor co-directing dissertation), Jianping P. Zheng (university representative), Changchun (Chad) Zeng (committee member), Mei Zhang (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Tran, H. P. (2016). Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_FA2016_Tran_fsu_0071E_13515 ;
Chicago Manual of Style (16th Edition):
Tran, Hoang Phong. “Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance.” 2016. Doctoral Dissertation, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_FA2016_Tran_fsu_0071E_13515 ;.
MLA Handbook (7th Edition):
Tran, Hoang Phong. “Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance.” 2016. Web. 24 May 2018.
Vancouver:
Tran HP. Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_FA2016_Tran_fsu_0071E_13515 ;.
Council of Science Editors:
Tran HP. Scalable Fabrications of Nanomaterial Based Piezoresistivity Sensors with Enhanced Performance. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_FA2016_Tran_fsu_0071E_13515 ;
Florida State University
25.
Smithyman, Jesse.
Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells.
Degree: PhD, Materials Science, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9248
;
► A novel electrochemical cell design based on yarn or fiber-like carbon nanotube electrodes was developed as an engineered solution for flexible electrochemical devices, namely electrical…
(more)
▼ A novel electrochemical cell design based on yarn or fiber-like carbon nanotube electrodes was developed as an engineered solution for flexible electrochemical devices, namely
electrical energy storage devices. Proof-of-concept cells consisting of porous CNT networks as the sole structural support, electronic conductor and active charge storage material were
fabricated and tested. The coaxial yarn cell provided a robust structure able to undergo flexural deformation with minimal impact on the energy storage performance. Greater than 95% of the
energy density and 99% of the power density was retained when wound around an 11 cm diameter cylinder. The electrochemical properties were characterized at stages throughout the fabrication
process to provide insights and potential directions for further development of these novel cell designs. To demonstrate the ability to improve the performance and extend the applicability of
the CNT network based cell design to various cell chemistries and material combinations, the versatile redox activity material vanadium oxide (VOx) was deposited onto
CNT yarns. A supercritical fluid deposition and in-situ oxidation process was utilized to create thin conformal coatings of vanadium oxide on carbon nanotube (CNT) surfaces throughout the
porous structure of CNT yarns. Half-cell electrochemical characterizations were conducted on carbon nanotube-vanadium oxide (CNT-VOx) yarn electrodes in an 8 M LiCl
aqueous electrolyte. The high surface area, interconnected pore structure and high electrical conductivity of the CNT yarn enabled extraordinary rate capabilities from the high capacity
Li/VOx system. Cyclic voltammetry tests with scan rates of several volts per second, requiring current densities of hundreds of amperes per gram of electrode mass
produced voltammograms with distinguishable redox peaks from Li-ion intercalation/deintercalation. Capacitances of over 150 F g-1 were achieved at a scan rate of 5
V s-1 over a 1.2 V potential window resulting in an energy density of > 32 Wh kg-1 (> 30 Wh L-1) for the
yarn electrode. The charge storage also showed good reversibility when cycled over this large potential window, maintaining 90% of the capacitance after 100 cycles at a scan rate of 2 V
s-1. Investigation into the structure-property relationship of the CNT yarn and the effects on electrochemical energy storage performance was conducted through
half-cell testing of single-filament CNT yarn electrodes. Electrochemical impedance spectroscopy (EIS) enabled the development of an equivalent circuit model based on representation of the
CNT yarn through a parallel configuration of a constant phase element (CPE) and Warburg impedance element. Various physical properties of the electrode and electrode-electrolyte system can be
obtained from model fitting of the experimental data, providing the ability to verify model accuracy through the comparison of…
Advisors/Committee Members: Zhiyong Richard Liang (professor directing dissertation), Albert E. Steigman (university representative ), Tao Liu (committee member), Jianping P. Zheng (committee member), Steven Lenhert (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Smithyman, J. (2014). Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9248 ;
Chicago Manual of Style (16th Edition):
Smithyman, Jesse. “Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells.” 2014. Doctoral Dissertation, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9248 ;.
MLA Handbook (7th Edition):
Smithyman, Jesse. “Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells.” 2014. Web. 24 May 2018.
Vancouver:
Smithyman J. Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells. [Internet] [Doctoral dissertation]. Florida State University; 2014. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9248 ;.
Council of Science Editors:
Smithyman J. Carbon Nanotube Network Based Coaxial Electrode Design for Electrochemical Cells. [Doctoral Dissertation]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9248 ;
Florida State University
26.
Blankenship, Trevor.
Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.
Degree: PhD, Chemistry and Biochemistry, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143
;
► Metal flux synthes is a useful alternative method to high temperature solid state synthesis; it allows easy diffusion of reactants at lower temperatures, and presents…
(more)
▼ Metal flux synthes is a useful alternative method to high temperature solid state synthesis; it allows easy diffusion of reactants at lower temperatures, and presents favorable
conditions for crystal growth. A mixed flux of calcium and lithium in a 1:1 ratio was explored in this work; this mixture melts at 300°C and is an excellent solvent for main group elements
and CaH₂. Reactions of p-block elements in a 1:1 Ca/Li flux have produced several new intermetallic and Zintl phases. Electronegative elements from groups 14 and 15 are reduced to anions in
this flux, yielding charge-balanced products. More electropositive metals from group 13 are not fully reduced; the resulting products are complex intermetallics. The reactions of tin or lead
and carbon in Ca/Li flux produced the analogous phases Ca₁₁Tt₃C8 (Tt = Sn, Pb) in the monoclinic C21/c space group (a = 13.2117(8) Å, b =10.7029(7) Å, c = 14.2493(9) Å, β = 105.650(1)° for
the Sn analog). These compounds are carbide Zintl phases that includes the rare combination of C₃⁴ and C₂² units as well as Sn⁴ or Pb⁴ anions. Ca/Li flux reactions of CaH2 and arsenic have
produced the Zintl phases LiCa₃As₂H in orthorhombic Pnma (a = 11.4064(7), b = 4.2702(3), c = 11.8762(8) Å), and Ca13As6C0.46N1.155H6.045in tetragonal P4/mbm (a = 15.7493(15), c = 9.1062(9)
Å). The complex stoichiometry of the latter phase was caused by incorporation of light element contaminants and was studied by neutron diffraction, showing mixing of anionic sites to achieve
charge balance. Ca/Li flux reactions with group 13 metals have resulted in several new intermetallic phases. Reactions of indium and CaH₂ in the Ca/Li flux (with or without boron) formed
Ca₅₃In₁₃B₄₋ₓH₂₃(2.4 < x < 4.0) in cubic space group Im-3 (a = 16.3608(6) Å) which features metallic indium atoms and ionic hydride sites. The electronic properties of this "subhydride"
were confirmed by ¹H and ¹¹⁵In NMR spectroscopy. Attempts to replace boron with carbon yielded Ca₁₂InC₁₃₋ₓ, (Im-3, a = 9.6055(8)Å) which contains C34- units. A very similar phase, Ba12InC18H4
(Im-3,a = 11.1415(8) Å), was grown from the reaction of indium, carbon, and LiH in Ba/Li flux. This compound also includes C₃⁴ units. Preliminary Ca/Li flux reactions of aluminum with other
main group elements have produced several new phases: a hydride clathrate Ca₃₁Al₂H₂₅ in cubic Fd-3m (a=18.0835(15) Å), Ca24Al2(C1-xHx)N2H16 in tetragonal P42/nmc (a=15.9069(12) Å,
c=13.7323(10) Å, and Ca4Al2N5 in orthorhombic Pna2₁ (a = 11.2331(1) Å, b=9.0768(8) Å, c=6.0093(5) Å.
A Dissertation submitted to the Department of Chemistry and Biochemistry in partial fulfillment of the requirements for the degree of Doctor of
Philosophy.
Fall Semester, 2014.
September 25, 2014.
Acetylide, Allenylide, Boride, Carbide, Hydride
Susan Latturner, Professor Directing Dissertation; Albert Stiegman, Committee Member; Igor Alabugin, Committee Member.
Advisors/Committee Members: Susan Latturner (professor directing dissertation), Bruce R. Locke (university representative), Albert E. Stiegman (committee member), Igor V. Alabugin (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Blankenship, T. (2014). Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143 ;
Chicago Manual of Style (16th Edition):
Blankenship, Trevor. “Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.” 2014. Doctoral Dissertation, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143 ;.
MLA Handbook (7th Edition):
Blankenship, Trevor. “Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.” 2014. Web. 24 May 2018.
Vancouver:
Blankenship T. Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. [Internet] [Doctoral dissertation]. Florida State University; 2014. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143 ;.
Council of Science Editors:
Blankenship T. Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. [Doctoral Dissertation]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143 ;
Florida State University
27.
Lundberg, Matthew.
Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).
Degree: MS, Materials Science, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212
;
► The BaLn(sub)2(/sub)O(sub)4(/sub) family has been synthesized successfully as single crystals by the flux-growth method. The phases crystallize in the CaV(sub)2(/sub)O(sub)4(/sub) structure prototype in space group…
(more)
▼ The BaLn(sub)2(/sub)O(sub)4(/sub) family has been synthesized successfully as single crystals by the flux-growth method. The phases crystallize in the CaV(sub)2(/sub)O(sub)4(/sub)
structure prototype in space group Pnma (# 62). The structure has been studied using single-crystal x-ray diffraction, and stoichiometry confirmed with EDS, and the unit cell parameters and
atomic positions have been determined for the whole lanthanide series (with the exception of the Lu compound). The effects of the lanthanide ionic radius on the atomic positions in the unit
cell has been studied in terms of fractional atomic coordinates, bond lengths and angles, and bond valence sums. Magnetic measurements have been performed on the series with the exception of
the La, Eu, and Lu members in the form of susceptibility versus temperature. The crystals all show signs of geometric antiferromagnetic frustration with the Néel temperatures significantly
below the temperature predicted by the Weiss constant. Additionally some members of the family, namely BaCe(sub)2(/sub)O(sub)4(/sub), BaNd(sub)2(/sub)O(sub)4(/sub),
BaPr(sub)2(/sub)O(sub)4(/sub), BaSm(sub)2(/sub)O(sub)4(/sub), BaTb(sub)2(/sub)O(sub)4(/sub), and BaYb(sub)2(/sub)O(sub)4(/sub) show significant crystal field splitting, that causes deviation
from Currie-Weiss behavior
A Thesis submitted to the Interdisciplinary Program in Materials Science in partial fulfillment of the requirements for the degree of Master of
Science.
Summer Semester, 2014.
July 21, 2014.
Theo Siegrist, Professor Directing Thesis; Susan Latturner, Committee Member; Sachin Shanbhag, Committee Member.
Advisors/Committee Members: Theo M. Siegrist (professor directing thesis), Susan Latturner (committee member), Sachin Shanbhag (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Lundberg, M. (2014). Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212 ;
Chicago Manual of Style (16th Edition):
Lundberg, Matthew. “Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).” 2014. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212 ;.
MLA Handbook (7th Edition):
Lundberg, Matthew. “Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).” 2014. Web. 24 May 2018.
Vancouver:
Lundberg M. Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). [Internet] [Masters thesis]. Florida State University; 2014. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212 ;.
Council of Science Editors:
Lundberg M. Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). [Masters Thesis]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212 ;
Florida State University
28.
Gallagher, Daniel Peter.
Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850
;
► In order to obtain an increased through-thickness thermal conductivity in carbon fiber reinforced composites, a novel method using heterogeneously structured resin with conductive filler was…
(more)
▼ In order to obtain an increased through-thickness thermal conductivity in carbon fiber reinforced composites, a novel method using heterogeneously structured resin with conductive filler was studied. Samples were produced using an alternating line pattern deposition of a highly concentrated silver-resin mixture and the neat resin. Microstructures and properties of the resulting composites were compared to those of a homogeneously dispersed filler matrix composite of similar loadings. Two different sets of pattern sample composites were produced using similar methods, but one used a manually deposited pattern method of depositing the resin, and the other used a dispenser. Both produced repeatable results which were comparable to each other, but the dispenser allowed for more uniform line deposition. The thermal diffusivity and conductivity of the resultant composites were measured by use of the LFA 457 Microflash device, and tensile and flexural tests were also conducted to obtain their mechanical properties. The results show that using a heterogeneously structured resin matrix with conductive filler on the composite leads to a significant increase in thermal conductivity over the homogeneous counterpart of the same loading, and an even greater increase over the neat carbon fiber/epon 862 composite. Through-thickness thermal conductivity in excess of 5 W/m K was obtained by using a 9 wt% silver loading heterogeneous composite. Also the mechanical properties of higher filler loading composites were comparable between the heterogeneously structured matrix and the homogeneously structured matrix composites.
A Thesis submitted to the Program in Materials Science in partial fulfillment of the requirements for the degree of Master of Science.
Summer Semester, 2012.
April 20, 2012.
Carbon Fiber, Composites, Heterogeneous, Silver, Thermal Conductivity, Through-Thickness
Zhiyong Liang, Professor Directing Thesis; Tao Liu, Committee Member; James Brooks, Committee Member.
Advisors/Committee Members: Zhiyong Liang (professor directing thesis), Tao Liu (committee member), James Brooks (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Gallagher, D. P. (2012). Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850 ;
Chicago Manual of Style (16th Edition):
Gallagher, Daniel Peter. “Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.” 2012. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850 ;.
MLA Handbook (7th Edition):
Gallagher, Daniel Peter. “Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.” 2012. Web. 24 May 2018.
Vancouver:
Gallagher DP. Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850 ;.
Council of Science Editors:
Gallagher DP. Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850 ;
Florida State University
29.
Weiss, Jeremy.
Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.
Degree: PhD, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484
;
► After nearly seven years of research effort since the discovery of iron-based superconductors, wires and tapes of K-doped BaFe2As2 have finally been developed by the…
(more)
▼ After nearly seven years of research effort since the discovery of iron-based superconductors, wires and tapes of K-doped BaFe2As2 have finally been developed by the inexpensive and scalable powder-in-tube technique with critical current densities reaching over 0.1 MAcm-2 at 4.2 K. Such progress relies heavily on the development of synthesis techniques that eliminate cracks and secondary phases. High energy ball milling, during which mechanochemical reactions take place, proves to be effective in producing high quality bulk material. The consolidation of high quality powders under high pressure produces bulk material with a fine grain microstructure and surprising high intergranular current density. We explore the dependence of doped Ba2Fe2As2 superconducting properties on sintering temperature in bulks, wires, and tapes to further optimize these materials and find that grain boundaries continue to act as weak-links, effectively blocking current, and limiting the intergranular critical current density in these materials. However, evidence for composition variation and impurity segregation across grain-boundaries suggests that the weak-linked behavior may still be of an extrinsic nature. Despite the current limiting effects of these weak-links, transport current is high enough in our fine grain material to demonstrate the first > 1 T magnet made out of an iron-based superconductor. These results provide a positive outlook for the potential future use of these materials to produce high field magnets.
A Dissertation submitted to the Department of Materials Science and Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Spring Semester, 2015.
April 9, 2015.
Ba122, ferropnictide, mechanochemical, superconductivity, superconductor
Eric Hellstrom, Professor Directing Dissertation; Gregory Boebinger, University Representative; David Larbalestier, Committee Member; Theo Siegrist, Committee Member; Per Arne Rikvold, Committee Member.
Advisors/Committee Members: Eric Hellstrom (professor directing dissertation), Gregory S. (Gregory Scott) Boebinger (university representative), D. (David) Larbalestier (committee member), Theo M. Siegrist (committee member), Per Arne Rikvold (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Weiss, J. (2015). Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484 ;
Chicago Manual of Style (16th Edition):
Weiss, Jeremy. “Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.” 2015. Doctoral Dissertation, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484 ;.
MLA Handbook (7th Edition):
Weiss, Jeremy. “Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.” 2015. Web. 24 May 2018.
Vancouver:
Weiss J. Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484 ;.
Council of Science Editors:
Weiss J. Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484 ;
Florida State University
30.
Li, Elizabeth Yau.
Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287
;
► The effect of N-methyl Morpholine N-Oxide (NMMO), 1-ethyl-3-methyl-imidazolium acetate ([Emim]Ac) and 1-ethyl-3-methyl-imidazolium diethyl phosphate ([Emim]DEP) on pretreatment and enzymatic hydrolysis of dissolving pulp was studied.…
(more)
▼ The effect of N-methyl Morpholine N-Oxide (NMMO), 1-ethyl-3-methyl-imidazolium acetate ([Emim]Ac) and 1-ethyl-3-methyl-imidazolium diethyl phosphate ([Emim]DEP) on pretreatment and enzymatic hydrolysis of dissolving pulp was studied. X-ray diffraction measurements of regenerated cellulose from these solvents showed that solvent pretreatment reduces the crystallinity of cellulose. However, crystallinity might not be a major factor affecting the in-situ enzymatic hydrolysis of cellulose in these solvents. Although regenerated cellulose from [Emim]DEP showed the lowest crystallinity index (~15%), in-situ enzymatic hydrolysis of cellulose dissolved in NMMO showed the highest cellulose conversion (68% compared to 65% for [Emim]Ac and 37% for [Emim]DEP at enzyme loading of 122 FPU/g). Moreover, results showed that enzymes could tolerate up to NMMO concentration of 100 g/L and still yield full conversion of cellulose. Since it is not necessary to remove all the NMMO, less amount of water will be required for the washing step and thus the process will be more economical. The HCH-1 model was used in an attempt to model the enzymatic hydrolysis of cellulose in NMMO. With the incorporation of NMMO inhibition and a factor to account for unreacted cellulose, the model was able to correlate the experimental data of the enzymatic hydrolysis of cellulose (6.68 g/L) at various NMMO concentrations (0, 50, 100, 150 and 250 g/L). However, the experimental results also suggest that NMMO might be deactivating the enzymes rather than inhibiting them. More studies need to be done at varying cellulose, NMMO and enzyme concentrations to find the exact nature of this deactivation of NMMO.
A Thesis submitted to the Graduate School in partial fulfillment of the requirements for the degree of Master in Science.
Summer Semester, 2012.
April 23, 2012.
Subramanian Ramakrishnan, Professor Directing Thesis; John Collier, Committee Member; John Telotte, Committee Member; Eric Hellstrom, Committee Member.
Advisors/Committee Members: Subramanian Ramakrishnan (professor directing thesis), John Collier (committee member), John Telotte (committee member), Eric Hellstrom (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Li, E. Y. (2012). Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287 ;
Chicago Manual of Style (16th Edition):
Li, Elizabeth Yau. “Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.” 2012. Masters Thesis, Florida State University. Accessed May 24, 2018.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287 ;.
MLA Handbook (7th Edition):
Li, Elizabeth Yau. “Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.” 2012. Web. 24 May 2018.
Vancouver:
Li EY. Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2018 May 24].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287 ;.
Council of Science Editors:
Li EY. Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287 ;
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Open Access Theses and Dissertations