Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Photo-responsive"”.
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Photo-responsive liquid crystal block copolymers/
Photo-responsive liquid crystal polymers (LCP) which contain azobenzene moieties have gained interest for their ability to change properties by merely irradiating them with the correct wavelength of light in the appropriate temperature range. Furthermore, they have been crosslinked for elasticity …
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Developing Photo-responsive Metal-Organic Frameworks towards Controlled Drug Delivery
… it to degrade. When loaded with drugs, this photo-enhanced degradation results in the release of the cargo thereby, providing a handle on controlling drug release with the use of a light trigger. We have demonstrated that in the presence of the MOF nanocarrier incorporating 5-fluorouracil (a …
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Photo-responsive degradable poly (beta-amino ester) toward non-viral gene delivery
… we herein report the design and development of a photo-responsive PBAE as a novel gene delivery vector which undergoes polymer degradation and promoted DNA release in response to external UV irradiation. Photo-responsive PBAE was synthesized by Michael addition of amines to …
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Developing photoresponsive lipid nanoparticles for the triggered release of small molecules
This thesis will examine numerous photo responsive drug delivery nanoparticles containing two different first-generation (1G) donor-acceptor Stenhouse adduct (DASA) molecules, DOPC, DLPC, cholesterol and lauric acid. The DASA isomerizes upon visible light irradiation, thereby increasing membrane …
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Surface Relief Grating on Thin Film Containing Azobenzene-Polymer Material Linked by Hydrogen-Bonding
… films of azobenzene-polymer material show unique photo-responsive behavior under irradiation with two interfering laser beams. That leads to generate surface inscription pattering known as Surface Relief Grating (SRG). Moreover, two different types of polymers were used in this research, and we …
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Controlling Self -Assembly of Anisotropic, Rod-Like Polypeptides on Solid Surfaces
… polypeptides that can lead to amplification of photo-induced changes in shape and polarity, and (3) preparation of self-assembled surfaces of rod-like polypeptides that incorporate photo-responsive groups. In this dissertation, progress made towards these goals will be discussed.
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Synthesis and modification of pamam dendrimers as histone replacement molecules
… small molecules based around L-histidine and photo-responsive azobenzene, and the use of these to modify the surface of 4th and 5th generation PAMAM dendrimers is reported in Chapters 4 and 5 respectively. There follows a final chapter containing detailed descriptions of the synthetic …
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Development of novel photocatalysts for solar hydrogen production
Photocatalysts, typically nanoparticulate semiconductors, can be used to split water into hydrogen and oxygen. If solar light is used for this, it opens the possibility of a renewable source of hydrogen. However, extension of photocatalytic response into the visible region of the solar spectrum is …
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Responsive polymers for dynamic modulation of bio-macromolecular transport properties
Responsive self-assembling polymers are used in wide range of applications in the food, pharmaceutical, agricultural, electronic and environmental industries, as well as in the biomedical field. The proper design of such polymers is critical for the particular applications being considered. In this …
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Reversibly Photo-Crosslinkable Polycarbonate-Based Polymersomes for Drug Encapsulation and Delivery
… pendant coumarin groups. Coumarin groups undergo photo-reversible dimerization when irradiated with specific ultraviolet wavelengths, so they can be used to prepare polymers with photo-responsive properties. In this case, the pendant coumarin groups enable stabilization of the polymersome membrane …
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Stimuli-Induced Structural Transformations of Metal–Organic Cages
… to diverse stimuli. Studying the structural responsiveness of MOCs not only deepens our understanding of dynamic self-assembly but also lays the groundwork for the development of smart materials with tailored functionalities, including molecular sensing, targeted delivery, and extractions. …
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Advancing protein-based biomaterials
… and cross-linked using UV-initiated photo-polymerisation to create photo-responsive hydrogels. By comparing various protein structural forms [globular and fibrils] and different manufacturing techniques, the study also provides insights into how these factors affect the properties of …
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Role of Vacancies and Electrochemical Applications of Facet-Controlled Synthetic Superlattice Nanomaterials
… and concentration of vacancies and transient photocurrent properties were investigated. The first section of the thesis focuses on the synthesis of high performance noxious materials for CE of DSSCs. In the process, it was intially found that the zeta potential is one of the key factors for …
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Synthesis, redox properties, and langmuir monolayer formation of selected 3d- and 4d- metalloamphiphiles
… find potential towards the fabrication of responsive films. This dissertation confers the synthesis and analysis of film forming properties of various redox-active metalloamphiphiles. Two new azido and thiocyanto bridged copper-based amphiphiles were synthesized and characterized by IR, …
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Hierarchical Supramolecular Assemblies Based on Host-Guest Chemistry between Cucurbit[n]uril and Azobenzene Derivatives
… yet dynamic ternary complexes.Owing to the photo-induced \textit{trans} to \textit{cis} isomerisation property, azobenzene (Azo) derivatives have been widely employed in several host-guest systems, leading to various light-responsive materials. This thesis focuses on CB[8]-based ternary …
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Stimuli-responsive microcapsules for self-protecting and self-healing material systems
Stimuli-responsive microcapsules are an attractive route to achieve smart functionality in material systems. Microcapsules isolate the active material from the surrounding environment while allowing programmable on-demand delivery in response to a variety of environmental triggers. These added …
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Thermal conductivity switching of polymers and lithium-ion battery electrode materials in response to external stimuli
… In this dissertation, I present novel stimuli-responsive polymers and Li-ion battery electrode materials that involve a wide range of thermal conductivity modulation in response to external stimuli. I describe thermal conductivity switching between high and low states of these thermal switching …