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University of Cincinnati
1.
Heitfeld, Kevin A.
Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery.
Degree: PhD, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179357187 
► This work focuses on the use of temperature responsive gels (TRGs) (polymeric hydrogels with a large temperature-dependent change in volume) for flavor retention at cooking…
(more)
▼ This work focuses on the use of temperature responsive
gels (TRGs) (polymeric hydrogels with a large temperature-dependent
change in volume) for flavor retention at cooking temperatures.
Specifically, we have studied a gel with a lower critical solution
temperature (LCST) that swells at low temperatures and collapses at
high temperatures. In the collapsed state, the polymer acts as a
transport barrier, keeping the volatile flavors inside. An
encapsulation system was designed to utilize the solution (phase
separation) behavior of a temperature responsive gel. The gel
morphology was understood and diffusive properties were tailored
through morphology manipulation. Heterogeneous and homogeneous gels
were processed by understanding the effect of temperature on gel
morphology. A morphology model was developed linking bulk diffusive
properties to molecular morphology. Flavor was encapsulated within
the gel and the emulsifying capability was determined. The capsules
responded to temperature similarly to the pure polymer. The release
kinetcs were compared to commercial gelatin capsules and the
temperature responsive polymer took longer to release. Chemistry
was developed following guidelines for the Food and Drug
Administration for food use. The food grade crosslinking was
coupled with commercial scale-up equipment to develop large scale
commercial production procedures. This dissertation resulted in a
new commercial encapsulation system. The system is able to tailor
release kinetics through processing conditions. New crosslinking
methods were developed with the possibility of opening new markets
in food, flavor, and fragrance.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Flavor; Encapsulation; Smart Polymers; Responsive Polymers; Controlled Release; Spray Drying
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APA (6th Edition):
Heitfeld, K. A. (2007). Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179357187
Chicago Manual of Style (16th Edition):
Heitfeld, Kevin A. “Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery.” 2007. Doctoral Dissertation, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179357187.
MLA Handbook (7th Edition):
Heitfeld, Kevin A. “Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery.” 2007. Web. 06 Dec 2019.
Vancouver:
Heitfeld KA. Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery. [Internet] [Doctoral dissertation]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179357187.
Council of Science Editors:
Heitfeld KA. Smart Membranes: Hydroxypropyl Cellulose for Flavor
Delivery. [Doctoral Dissertation]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179357187
University of Cincinnati
2.
Wang, Peng.
Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques.
Degree: MS, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181920566
► In this work, a highly sensitive non-destructive pore structure characterization method was developed. Porous low-ê films were measured under limiting vapor-saturation levels by neutron reflectivity…
(more)
▼ In this work, a highly sensitive non-destructive pore
structure characterization method was developed. Porous low-ê films
were measured under limiting vapor-saturation levels by neutron
reflectivity (NR) and X-ray reflectivity (XR). Important pore
structure parameters such as atomic composition, film thickness and
porosity profile normal to the substrate were obtained by analyzing
and interpreting the experimental data without damage to the low-¿
films.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering, Materials Science; low-&954; pore structure; neutron reflectivity; X-ray reflectivity; nondestructive
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APA (6th Edition):
Wang, P. (2007). Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181920566
Chicago Manual of Style (16th Edition):
Wang, Peng. “Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques.” 2007. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181920566.
MLA Handbook (7th Edition):
Wang, Peng. “Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques.” 2007. Web. 06 Dec 2019.
Vancouver:
Wang P. Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques. [Internet] [Masters thesis]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181920566.
Council of Science Editors:
Wang P. Characterization of Porous Low-¿ Dielectric Films by
Combined Scattering Techniques. [Masters Thesis]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181920566
University of Cincinnati
3.
Atthipalli, Gowtam.
Light Scattering by Colloids Larger than Wavelength of
Light.
Degree: MS, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826
► The twin objectives of this thesis is to understand what happens when light is scattered by colloids larger than the wavelength of light and study…
(more)
▼ The twin objectives of this thesis is to understand
what happens when light is scattered by colloids larger than the
wavelength of light and study light scattering results on an
absolute scale by means of calibration. The first objective was
achieved studying scattering by silica and the second objective
used light scattering results from spherical polystyrene beads and
calibrate a static light scattering instrument. Inorganic silica is
widely used a filler material in rubber to increase its mechanical
properties. Precipitated silica particles, like the ones studied in
this report have three major size scales – agglomerates,
aggregates, primary particles. Light scattering technique has been
used to study the breakup of agglomerates in silica. The study aims
at providing insight into the breakup of agglomerates by a
combination of varying three parameters - concentration,
obscuration and sonication power. The breakup of agglomerates is
helpful in the dispersion of silica in a rubber matrix without
actually formulating rubber. Polystyrene (PS) beads were used for
the calibration study. Using Mie theory the contrast (difference in
the scattering length densities) was identified and
calculated.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
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APA (6th Edition):
Atthipalli, G. (2007). Light Scattering by Colloids Larger than Wavelength of
Light. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826
Chicago Manual of Style (16th Edition):
Atthipalli, Gowtam. “Light Scattering by Colloids Larger than Wavelength of
Light.” 2007. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826.
MLA Handbook (7th Edition):
Atthipalli, Gowtam. “Light Scattering by Colloids Larger than Wavelength of
Light.” 2007. Web. 06 Dec 2019.
Vancouver:
Atthipalli G. Light Scattering by Colloids Larger than Wavelength of
Light. [Internet] [Masters thesis]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826.
Council of Science Editors:
Atthipalli G. Light Scattering by Colloids Larger than Wavelength of
Light. [Masters Thesis]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826
University of Cincinnati
4.
Wang, Yimin.
Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings.
Degree: PhD, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186412600
► This dissertation focuses on the relationship between substrate-surface chemistry (cleaning), reaction mechanism, film structure and water-barrier properties of water-based bis-amino silane and vinyl triacetoxysilane…
(more)
▼ This dissertation focuses on the relationship
between substrate-surface chemistry (cleaning), reaction mechanism,
film structure and water-barrier properties of water-based
bis-amino silane and vinyl triacetoxysilane films. The work was
undertaked to fulfill a SERDP (Strategic Environment Research and
Development Program) requirement to understand the mechanism of
corrosion protection in silane-based coatings. The majority of the
work focuses on mixtures of the above two silanes. Such coatings
are referred to as AV coatings. The chemistry of
neat AV mixtures was studied by
13C NMR. The
reaction mechanism was found to be the exchange of the hydrogen
atom on the secondary amine group with the acetoxy group on the
vinyl triacetoxysilane. The chemistry of the AV water solution was
also investigated by
13C and
29Si NMR. The influence
of the cleaning solution pH on the CRS surface chemistry and AV
absorption was examined. The corrosion performance examination on
CRS panels showed that the CRS surface is very sensitive to
cleaning protocol. Optimum anti-corrosion performance was obtained
after cleaning at pH ~ 9.5. The underlying mechanism for this
observation is discussed. The morphologies and
water barrier properties of AV films were studied at different A/V
ratios. AV film was found susceptible to water penetration. About
30 vol% water is absorbed in the film with only slight thickness
increase. Most water is physically absorbed in the void space with
the least amount being absorbed near the stoichiometric A/V ratio
of 3/1. Kinetic investigation of water uptake
enables us to monitor water ingress providing more details on water
absorption. Time-resolved D
2O ingress in
bis-amino silane and bis-sulfur silane film was studied by situ
neutron reflectivity and Fourier transform infrared
reflection-absorption spectroscopy. The absorbed water exists in
two populations: one is dissolved in the polymer matrix (Henry’s
mode) and the other occupies unrelaxed free volume within the
polymer (Langmuir mode). The Langmuir absorption mode dominates the
D
2O absorption in both films. The initial
stage of water diffusion of both bis-amino silane and bis-sulfur
silane was Fickian. However, the deviation from Fickian behavior
was observed at the intermediate stage of water
ingress.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering, Materials Science; Silane; Corrosion; Water penetration; Water barrier; Kinetic; Cleaning; Pretreatment; Reaction; Hydrolysis
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APA (6th Edition):
Wang, Y. (2007). Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186412600
Chicago Manual of Style (16th Edition):
Wang, Yimin. “Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings.” 2007. Doctoral Dissertation, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186412600.
MLA Handbook (7th Edition):
Wang, Yimin. “Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings.” 2007. Web. 06 Dec 2019.
Vancouver:
Wang Y. Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings. [Internet] [Doctoral dissertation]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186412600.
Council of Science Editors:
Wang Y. Pretreatment, Morphology and Properties of Organosilane
Anti-Corrison Coatings. [Doctoral Dissertation]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186412600
University of Cincinnati
5.
Chokalingam, Kumar.
Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation.
Degree: MS, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187019230
► This work focuses on the formation of multilayers by layer-by-layer deposition of weak polyelectrolytes, poly (allylamine hydrochloride) and poly (acrylic acid). These multilayers were built…
(more)
▼ This work focuses on the formation of multilayers by
layer-by-layer deposition of weak polyelectrolytes, poly
(allylamine hydrochloride) and poly (acrylic acid). These
multilayers were built on smooth surfaces (silicon wafer) and rough
surfaces (Millipore membrane, clay-coated paper). The effect of
concentrations, pH of the depositing polyelectrolyte solutions and
drying between the absorption steps were investigated in films
deposited on Si wafers. These films were characterized using
ellipsometry, contact angle and AFM. In the pH ranges investigated
in the study (2.5-4.5), at concentrations of 10-2 M and 10-1 M, the
layer-by-layer deposition proceeds in a linear manner, with pH
influencing the thickness of the bilayers. Thickness of the films
increased with increase in the solution pH. The films deposited at
higher concentrations showed higher thickness and roughness. Drying
in all cases, lead to thinner and rougher films. Contact angle
studies showed that the wettability of the polyelectrolyte
multilayers is likely dependent upon the interpenetration of the
underlying layer and can change with the pH of the solution. Drying
had a significant effect when films were deposited at lower
concentration but no effect when films were deposited at higher
concentrations. Polyelectrolytes were also deposited on Millipore
membranes and clay- coated papers. USAXS data on coated Millipore
membranes showed that coating densified the fibers and also reduced
the pore and solid chords. Permeation studies in coated Millipore
membranes showed that bilayers increase the selectivity for CO2.
Permeation studies in coated clay-coated paper showed that bilayers
reduce water vapor permeability.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering; Materials Science
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APA (6th Edition):
Chokalingam, K. (2007). Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187019230
Chicago Manual of Style (16th Edition):
Chokalingam, Kumar. “Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation.” 2007. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187019230.
MLA Handbook (7th Edition):
Chokalingam, Kumar. “Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation.” 2007. Web. 06 Dec 2019.
Vancouver:
Chokalingam K. Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation. [Internet] [Masters thesis]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187019230.
Council of Science Editors:
Chokalingam K. Poly (Allylamine Hydrochloride) and Poly (Acrylic Acid)
Multilayers for Gas Separation. [Masters Thesis]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187019230
University of Cincinnati
6.
JUSTICE, RYAN SCOTT.
SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS.
Degree: PhD, Engineering : Materials Science, 2007, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584
► Loading polymer matrices with nanoscale fillers is widely believed to have the potential to push polymer properties to extreme values. Realization of anticipated properties, however,…
(more)
▼ Loading polymer matrices with nanoscale fillers is
widely believed to have the potential to push polymer properties to
extreme values. Realization of anticipated properties, however, has
proven elusive. Recent nanocomposite research suggests better
characterization of the large-scale morphology will provide insight
explaining these shortfalls. The chapters in this dissertation
present ultra small-angle X-ray scattering (USAXS) as a viable tool
for elucidating the hierarchical filler morphology that exists
within polymer nanocomposites. In Chapter 1, the relationship
between imaging data and scattering data is discussed in the
context of filler dispersion, where scattering is presented as a
complementary characterization technique that, when combined with
microscopy, can reveal significantly more morphological information
than possible with either technique independently. Chapter 2
provides the details of both a simplified and a fractal tube form
factor for the analysis of tube-like (hollow cylinder) fillers, and
the analysis of carbon nanotube-filled bismaleimide composites is
presented. In Chapter 3, the fractal tube form factor is also used
to augment the analysis of percolative networks in carbon
nanofiber-filled epoxy composites. The analysis shows that the
morphology resulting in electrical percolation in these systems is
much more complicated than more common analysis techniques have
shown in the literature. Chapter 4 presents the characterization of
a system of colloidal silica/epoxy nanocomposites that shows
toughness and modulus improvement without sacrificing the working
temperature of the neat resin. USAXS analysis concludes the
nanoparticles are individually dispersed up to loadings of 25 wt%
with an exclusion zone extending to at least ~10x the particle
radius at all loadings. While the exclusion zone is not
mechanically significant, the silica particles are shown to be
effective in reinforcing hard resins. In Chapter 5, the details of
a layered-silicate/epoxy system that is scalable and shows both
improved toughness and flexural modulus over the neat resin are
documented. The implication from this work is homogeneity in the
layered silicate morphology is imperative to have simultaneous
improvement of modulus and fracture toughness. However, homogeneity
in filler morphology is not exclusive to complete exfoliation of
the nanoclay layers.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: small-angle scattering; nanocomposites; carbon nanotubes; colloidal silica; layered silcates
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APA (6th Edition):
JUSTICE, R. S. (2007). SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584
Chicago Manual of Style (16th Edition):
JUSTICE, RYAN SCOTT. “SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS.” 2007. Doctoral Dissertation, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584.
MLA Handbook (7th Edition):
JUSTICE, RYAN SCOTT. “SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS.” 2007. Web. 06 Dec 2019.
Vancouver:
JUSTICE RS. SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS. [Internet] [Doctoral dissertation]. University of Cincinnati; 2007. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584.
Council of Science Editors:
JUSTICE RS. SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF
HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS. [Doctoral Dissertation]. University of Cincinnati; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584
University of Cincinnati
7.
PAN, GUIRONG.
MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS.
Degree: PhD, Engineering : Materials Science, 2006, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690
► Although it is known that certain organosilanes can dramatically improve the corrosion resistance when deposited on metals, the origin of this effect and its dependence…
(more)
▼ Although it is known that certain organosilanes can
dramatically improve the corrosion resistance when deposited on
metals, the origin of this effect and its dependence on film
characteristics are not fully understood. In this work, the
morphology and structure of the silane films, as well as their
response to water exposure, are studied mainly by neutron
reflectivity. Hydrothermal conditioning and solvent swelling are
used to challenge the films. The silanes studied include
bis-[triethoxysilylpropyl]tetrasulfide (bis-sulfur) and
bis-[trimethoxysilylpropyl]amine (bis-amino) as well as mixed
silane films. Initial studies were done on films spin-coated on
silicon wafer substrates from 1% solutions and cured at 80 °C. Here
the focus is the effect of the bridging group on the morphology and
water-barrier properties of the films. Subsequent work addresses
the same systems deposited on aluminum substrates, films cured at
180 °C and films of larger thickness. The goal is to clarify the
relationship between silane molecular structure, processing
variables, morphology and water-barrier properties of films while
developing a database for optimizing the performance in
anti-corrosion applications. Bridging group is the key factor that
controls the morphology and water-barrier properties of silane
films. Bis-sulfur silane is not as condensed as bis-amino silane,
but it swells less in water because of the hydrophobic nature of
bridging group. By contrast, bis-amino film is more hydrophilic
since the secondary amine group hydrogen bonds with water. The bulk
mixed silane film swells with water to an extent that is slightly
less than that of both components weighted by their volume
fraction. But, based on the enhanced shrinkage that occurs upon
water conditioning of the mixed film, condensation is accelerated
in the mixed silane film. Bis-amino silane, may act as a catalyst
in the hydrolysis of bis-sulfur silane leading to more silanols
groups in the solution, which in turn will improve the wettability
of the solution. This effect might explain the superior performance
of the mixed film compared to pure bis-sulfur silane film.
Processing variables also impact the water-barrier performance. For
bis-sulfur silane films, both larger thickness and higher cure
temperature are critical for effective water-barrier
properties.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering, Materials Science; Silane film; neutron reflectivity; swelling; interface; processing variable; water barrier; anti-corrosion; water absorption
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APA (6th Edition):
PAN, G. (2006). MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690
Chicago Manual of Style (16th Edition):
PAN, GUIRONG. “MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS.” 2006. Doctoral Dissertation, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690.
MLA Handbook (7th Edition):
PAN, GUIRONG. “MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS.” 2006. Web. 06 Dec 2019.
Vancouver:
PAN G. MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS. [Internet] [Doctoral dissertation]. University of Cincinnati; 2006. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690.
Council of Science Editors:
PAN G. MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE
FILMS. [Doctoral Dissertation]. University of Cincinnati; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690
University of Cincinnati
8.
JUSTICE, RYAN SCOTT.
INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES.
Degree: MS, Engineering : Materials Science, 2006, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056
► Based on both imaging and some small-angle scattering, the literature suggests the phase separation between the polymer and liquid crystal (LC) phases in polymer dispersed…
(more)
▼ Based on both imaging and some small-angle scattering,
the literature suggests the phase separation between the polymer
and liquid crystal (LC) phases in polymer dispersed liquid crystal
(PDLC) composites results in a pure LC phase with a sharp and
smooth interface. In this work, based on analysis of similar data,
this conventional picture is brought into question. Here, we
examine the two-phase morphology in an acrylate-based system that
develops during polymerization-induced phase separation. Using
ultra-small and small angle x-ray scattering in corroboration with
microscopy, this work analyzes the affects of LC loading, PDLC
recipe, and sample processing on the developing morphology between
the two phases. From these analyses, we find inconsistencies
between the literature and our experiments regarding the impact of
recipe constituents and sample processing on LC domain size.
Further, we find that interfaces in PDLCs are seemingly much more
disordered than generally appreciated.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering, Materials Science; ultra-small angle x-ray scattering; interface morphology; liquid crystal
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APA (6th Edition):
JUSTICE, R. S. (2006). INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056
Chicago Manual of Style (16th Edition):
JUSTICE, RYAN SCOTT. “INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES.” 2006. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056.
MLA Handbook (7th Edition):
JUSTICE, RYAN SCOTT. “INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES.” 2006. Web. 06 Dec 2019.
Vancouver:
JUSTICE RS. INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES. [Internet] [Masters thesis]. University of Cincinnati; 2006. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056.
Council of Science Editors:
JUSTICE RS. INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER
DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES. [Masters Thesis]. University of Cincinnati; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056
University of Cincinnati
9.
Heitfeld, Kevin A.
Hydroxypropyl Cellulose for Flavor Encapsulation.
Degree: MS, Engineering : Materials Science, 2006, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163785195
► This work focuses on the use of temperature responsive gels (TRGs) (polymeric hydrogels with a large temperature-dependent change in volume) for flavor retention at cooking…
(more)
▼ This work focuses on the use of temperature responsive
gels (TRGs) (polymeric hydrogels with a large temperature-dependent
change in volume) for flavor retention at cooking temperatures.
Specifically, we have studied a gel with a lower critical solution
temperature (LCST) that swells at low temperatures and collapses at
high temperatures. In the collapsed state, the polymer acts as a
transport barrier, keeping the volatile flavors inside. We have
successfully synthesized a cellulose gel to exhibit this volume
change and have encapsulated an oil phase inside the gel. The
flavor-loaded encapsulated oil exhibited an increased release time
when compared to similar gelatin capsules.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering, Materials Science; temperature responsive polymers; flavor encapsulation; controlled release
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APA (6th Edition):
Heitfeld, K. A. (2006). Hydroxypropyl Cellulose for Flavor Encapsulation. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163785195
Chicago Manual of Style (16th Edition):
Heitfeld, Kevin A. “Hydroxypropyl Cellulose for Flavor Encapsulation.” 2006. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163785195.
MLA Handbook (7th Edition):
Heitfeld, Kevin A. “Hydroxypropyl Cellulose for Flavor Encapsulation.” 2006. Web. 06 Dec 2019.
Vancouver:
Heitfeld KA. Hydroxypropyl Cellulose for Flavor Encapsulation. [Internet] [Masters thesis]. University of Cincinnati; 2006. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163785195.
Council of Science Editors:
Heitfeld KA. Hydroxypropyl Cellulose for Flavor Encapsulation. [Masters Thesis]. University of Cincinnati; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163785195
University of Cincinnati
10.
SURYAWANSHI, CHETAN NIVRITTINATH.
STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA.
Degree: MS, Engineering : Materials Science, 2003, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054753442
► Subtle changes in synthesis and processing of reinforcing fillers are known to have substantial impact on mechanical properties of elastomers. The task of linking the…
(more)
▼ Subtle changes in synthesis and processing of
reinforcing fillers are known to have substantial impact on
mechanical properties of elastomers. The task of linking the
synthetic process with resulting structure and final properties is
difficult because reinforcing fillers are complex structures,
spanning over 6 decades in length scales. Ultra Small angle X-ray
scattering (USAXS) and light scattering (LS) are effective tools to
characterize these colloidal structures. In the first section of
this work, the role of drying technique on structure of
precipitated silica was studied. By using LS and USAXS, the effect
of drying on morphology of both, aggregate / (nanoscale) and
agglomerate / (micron scale) structure was established. The gentle
process of oven drying leads to weakly interpenetrated aggregates,
which are clustered in agglomerates. The agglomerate size exceeds
50µm in radius of gyration. Spray drying on the other hand produces
agglomerates of order of 10µm, with minimal interpenetration of
aggregates. On dispersion in rubber, the fillers look identical in
aggregate regime. The interpenetration of aggregates was attributed
to the rate of drying. The powders show marginal difference in
degree to which agglomerates break on milling in rubber. From
scanning electron micrographs, the size of agglomerates formed
during spray drying was found to be less than the size of those
formed during oven drying. The effect of drying on agglomerate
strength was investigated by sonication and LS. For the same amount
of sonication energy, it was observed that the agglomerates in
solutions (silica never dried) broke down dramatically as compared
to dried powders. Finally, the mechanical properties of rubber
filled with never-dried silica, spray-dried silica and oven-dried
silica powder, were compared. It was observed that the never-dried
silica filled rubber and spray dried powder give far better
properties than the oven dried rubber because of facile dispersion
and less interpenetration of agglomerates. It was concluded that
the process of drying leads to strong bonds in the agglomerates,
making them hard to disperse. In the second part of this work, the
possibility of in-situ modification of silica structure was
investigated. 3-mercapto propyl tri-ethoxy silane was added as a
surface- modifying agent and different samples were synthesized by
varying the amount of silane. USAXS study revealed decreasing trend
in what seems to be the interpenetration of aggregates, with
increase in the amount of silane added. Light scattering revealed a
slight decrease in size of particles, with increasing amount of
silane. SEM showed suppression of clusters by adding silane. It was
concluded that in-situ modification changes the silica structure on
the aggregate and agglomerate scale.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: ultra small angle x-ray scattering; drying; sonication; agglomeration; dispersion
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
SURYAWANSHI, C. N. (2003). STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054753442
Chicago Manual of Style (16th Edition):
SURYAWANSHI, CHETAN NIVRITTINATH. “STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA.” 2003. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054753442.
MLA Handbook (7th Edition):
SURYAWANSHI, CHETAN NIVRITTINATH. “STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA.” 2003. Web. 06 Dec 2019.
Vancouver:
SURYAWANSHI CN. STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA. [Internet] [Masters thesis]. University of Cincinnati; 2003. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054753442.
Council of Science Editors:
SURYAWANSHI CN. STUDY OF FACTORS INFLUENCING STRUCTURE OF PRECIPITATED
SILICA. [Masters Thesis]. University of Cincinnati; 2003. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054753442
University of Cincinnati
11.
ZHAO, JIAN.
DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES.
Degree: MS, Engineering : Materials Science, 2004, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1084221038
► Dispersion and morphology of carbon nanotubes as well as enhancement for rubber reinforcement are studied. A number of characterization methods are used to assess both…
(more)
▼ Dispersion and morphology of carbon nanotubes as well
as enhancement for rubber reinforcement are studied. A number of
characterization methods are used to assess both the degree of
dispersion and the level of reinforcement. Small angle scattering
(ultra small angle x-ray scattering, small-angle x-ray scattering
and light scattering) is carried out to assess structure and
dispersion of nanotubes suspended in polyelectrolytes. Transmission
electron microscopy and light microscopy are used to assist the
investigation. Stress-strain measurement and dynamic mechanical
analysis are performed on elastomeric composites to study polymer
reinforcement and filler-filler networking. Ultra small angle x-ray
scattering is used to study the morphology of pristine and
polyelectrolyte-coated multi-walled carbon nanofiber-reinforced
polyurethane composites.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
Subjects/Keywords: Engineering; Materials Science
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
ZHAO, J. (2004). DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1084221038
Chicago Manual of Style (16th Edition):
ZHAO, JIAN. “DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES.” 2004. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1084221038.
MLA Handbook (7th Edition):
ZHAO, JIAN. “DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES.” 2004. Web. 06 Dec 2019.
Vancouver:
ZHAO J. DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES. [Internet] [Masters thesis]. University of Cincinnati; 2004. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1084221038.
Council of Science Editors:
ZHAO J. DISPERSION AND MORPHOLOGY OF CARBON NANOTUBES. [Masters Thesis]. University of Cincinnati; 2004. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1084221038
University of Cincinnati
12.
ZHENG, DAZHI.
STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM.
Degree: MS, Engineering : Materials Science, 2004, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100789124
► Porous polyolefin films are commonly used as separators in the battery industry. The thermal response of this separator membrane is critical to battery performance, particularly…
(more)
▼ Porous polyolefin films are commonly used as
separators in the battery industry. The thermal response of this
separator membrane is critical to battery performance, particularly
with regard to battery safety. Two commercial separator films
(Teklon and Asahi) were studied in this Thesis. The major component
of these films is ultra high molecular weight polyethylene
(UHMWPE). As the temperature of the films rises above the softening
point, pores collapse and ion transport ceases leading to a current
shutdown. Pore morphology evolution with temperature plays very
important roles in the shutdown behavior. Ultra small angle
scattering (USAXS) was used to characterize pore evolution in near
the softening temperature. Pore anisotropy on different length
scales was measured by anisotropic ultra small angle scattering
(AUSAXS). SEM images were also reported that were consistent with
the USAXS analysis. The study is divided into two sections: in situ
conditioning and ex situ conditioning. The in situ study covers
experiments on polyelectrolyte-saturated samples thermally
conditioned in the x-ray instrument. The ex situ study focused on
films conditioned external to the USAXS camera and studied at room
temperature in the dry state. The ex-situ conditioned dry films
were observed through USAXS and AUSAXS. The data were analyzed to
extract Guinier radius, Porod constant, surface area, pore chord,
and solid chord in the machine direction (MD) and transverse
direction (TD). Pore anisotropy evolution was measured using
AUSAXS. Anisotropy at three length scales was measured by
performing azimuthal scans at three different scattering angles.
The Hermans orientation factor was used to make quantitative
comparisons between the Teklon and Asahi materials. The results
show that Teklon samples have larger pores (pore chord in MD = 1550
Å, pore chord in TD = 1400 Å) that collapse abruptly when the
temperature rises above the softening temperature while Asahi films
have smaller pores (pore chord in MD = 650 Å, pore chord in TD =
570 Å) that evolve more gradually with rising temperature. The
AUSAXS data show that the pores of Teklon films are more
anisotropic than Asahi films. Above the softening temperature, both
Teklon and Asahi samples become isotropic.
Advisors/Committee Members: Schaefer, Dr. Dale (Advisor).
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
ZHENG, D. (2004). STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100789124
Chicago Manual of Style (16th Edition):
ZHENG, DAZHI. “STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM.” 2004. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100789124.
MLA Handbook (7th Edition):
ZHENG, DAZHI. “STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM.” 2004. Web. 06 Dec 2019.
Vancouver:
ZHENG D. STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM. [Internet] [Masters thesis]. University of Cincinnati; 2004. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100789124.
Council of Science Editors:
ZHENG D. STUDY OF PORE MORPHOLOGY AND ANISOTROPIC EVOLUTION WITH
THERMAL EXCURSION OF UHMWPE FILM. [Masters Thesis]. University of Cincinnati; 2004. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100789124
University of Cincinnati
13.
PAN, GUIRONG.
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS.
Degree: MS, Engineering : Materials Science, 2003, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103
► Inorganic-organic hybrid materials can provide excellent combined properties. And when the length scale of the component phase approaches nanometers, the expected global properties will be…
(more)
▼ Inorganic-organic hybrid materials can provide
excellent combined properties. And when the length scale of the
component phase approaches nanometers, the expected global
properties will be more strongly affected by interfacial
interactions rather than bulk phase properties. Polyhedral
oligomeric silsesquioxane (POSS) is an entirely new inorganic
component that has defined structure and functional groups; thus
POSS opens the possibility of preparing nanocomposites with
controlled morphology and tailored interfaces. POSS systems can be
developed to elucidate the effect of the structure and interfacial
bonding on polymer microstructure and the resulting effects on
macroscopic properties. The first section of this thesis reports
the use of monovinyl POSS as a building block to make
controlled-structure materials. Four POSS cages with vinyl groups
were linked to a central siloxane core using a hydrosilylation
reaction. The hydrosilylation reaction was monitored using
fourier-transform infrared spectroscopy (FT-IR) and proton nuclear
magnetic resonance (1H-NMR). The resulting structure was confirmed
by mass spectroscopy (MALDI-MS). In the second section, POSS was
incorporated into poly(dimethylsiloxane) (PDMS) physically and
chemically to investigate the effect of polymer-filler bonding. For
physically blended composites, single POSS molecules and the
molecules with up to four connected POSS (tetraPOSS) were used. The
goal was to investigate the size effect on the reinforcement. In
the chemically-bonding system, vinyl terminated PDMS was used;
therefore, some POSS molecules were attached to the network through
the hydrosilylation reaction. Both tensile tests and dynamic
mechanical analysis showed that simply blending these POSS-based
fillers into silanol-terminated PDMS had little effect on its
mechanical properties, but bonding them to the PDMS provided
considerable reinforcement. Based on these results, it seems that
the reinforcement results not from direct bonding, but rather from
the improved dispersion that indirectly results from
bonding.
Advisors/Committee Members: Schaefer, Dr. Dale W. (Advisor).
Subjects/Keywords: polyhedral Oligomeric Silsesquioxane; Siloxane elastomer; nanocomposites; mechanical properties; reinforcement
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
PAN, G. (2003). REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103
Chicago Manual of Style (16th Edition):
PAN, GUIRONG. “REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS.” 2003. Masters Thesis, University of Cincinnati. Accessed December 06, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103.
MLA Handbook (7th Edition):
PAN, GUIRONG. “REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS.” 2003. Web. 06 Dec 2019.
Vancouver:
PAN G. REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS. [Internet] [Masters thesis]. University of Cincinnati; 2003. [cited 2019 Dec 06].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103.
Council of Science Editors:
PAN G. REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED
FILLERS. [Masters Thesis]. University of Cincinnati; 2003. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103
. 
Open Access Theses and Dissertations