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 20 of 164 for “"switchable"”.
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Switchable biological surfaces
The ability to control properties such as wettability and bio-molecule immobilisation onto self-assembled monolayers (SAMs) has many potential biological and medical applications. The aim of this project was to produce mixed biotinylated peptide monolayers that are responsive to an electric …
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Emulsion Polymerization Using Switchable Surfactants
… focuses on expanding the use of CO2-triggered switchable surfactants in emulsion polymerization of hydrophobic and hydrophilic monomers. Bicarbonate salts of the following compounds were employed as surfactants in the emulsion polymerization of styrene, methyl methacrylate (MMA) and/or butyl …
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Shock isolation using switchable stiffness
… is considered, and the effectiveness of a switchable isolation stiffness strategy is evaluated. This strategy aims to reduce the shock response by switching the stiffness to a low value during the shock input. Two different models are considered for the theoretical analysis, namely, a …
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Switchable stiffness scanning microscope probe
… in order to achieve high resolution imaging. The switchable stiffness probe allows the scanning of biological samples with varying surface hardness without changing probes during scanning, and therefore prevents a loss of positional information, as is unavoidable with conventional devices. For the …
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Development of a switchable radioisotope generator
<p>The Switchable Radioisotope Generator utilizes alpha-induced reactions to produce a combination of photons, neutrons, and protons with varying fluxes dependent on target materials and source geometry. The activity/strength of the secondary radiation is further controlled by manipulating the …
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A Novel Switchable Thermal Insulation Technology
Switchable thermal insulation, in the form of an opaque panel that alternates between thermally conductive and insulated states, can be an effective means of regulating the thermal environment by selectively transferring heat between the indoor and outdoor environments. Pioneering work has been …
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Designing switchable solvents for sustainable process development
… reactions and separations, and CO₂ capture. The switchable solvents are shown to serve as effective media for running reactions, with the switch providing facile recovery of products and catalysts for solvent recycling. Lastly, the switch itself is exploited to provide for the separation of CO₂ …
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Magnetic adsorbents displaying switchable ion-exchange behaviour
… a model mixture of acidic and basic proteins. Switchable ion-exchange behaviour was demonstrated, with anion binding capacity >25 mg/g support at pH 5 and cation binding >25 mg/g seen for Ce(IV) grafted supports. Improved elution by pH was also seen, with up to 73% of bound lysozyme removed …
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Switchable butadiene sulfone pretreatment of lignocellulosic biomass
Biofuels and chemicals from lignocellulosic biomass are a renewable and sustainable alternative to traditional fossil fuel sources. However, the reality of commercial lignocellulosic biofuels depends on feasibly overcoming the recalcitrance of the biomass plant cell wall, which consists of lignin …
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CO2-Triggered Switchable Solvent Systems and Their Applications
… The two solvent system studied here are switchable polarity solvents (SPS). A switchable polarity solvent is a liquid where its polarity can change between two forms by a trigger. These two solvent systems have several similar characteristics. First, they both require CO2 as the switching …
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Twofold switchable block copolymers based on new polyzwitterions
In complement to the well-established zwitterionic monomers 3-((2-(methacryloyloxy)ethyl)dimethylammonio)propane-1-sulfonate (“SPE”) and 3-((3-methacrylamidopropyl)dimethylammonio)propane-1-sulfonate (“SPP”), the closely related sulfobetaine monomers were synthesized and polymerized by reversible …
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Design & engineering of conformationally switchable artificial metalloproteins (swArMs)
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Development of switchable planar reflectors for beam shaping realization
… element configurations for the design of beam switchable planar reflectors. Moreover unit cells based on liquid crystal substrates were also designed for comparison between two reconfigurable planar reflector design techniques. 3Dimensional electromagnetic computer models of CST Microwave …
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Expanded cyclophanes for switchable capture/release of metal complexes
The thesis, entitled ‘Expanded Cyclophanes for Switchable Capture/Release of Metal Complexes’ is separated into four main chapters. The first chapter focuses on the introduction of cyclophane receptors and the use of cyclophanes in molecular machines and some other potential applications. Then, an …
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Novel Switchable Stationary Phase Methods For Supercritical Fluid Chromatography
… 10.4). In the next part, a novel, externally pH switchable water stationary phase for use in SFC was investigated. By adding NH4OH to the water coating and system hydration, changes in CO2 pressure and temperature allow a wide range of stationary phase pH conditions (~3-9) to be achieved. Through …
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Improvements in the Performance and Understanding of Switchable-Hydrophilicity Solvents
Switchable-hydrophilicity solvents (SHSs) are amine and amidine solvents that can be reversibly switched between two forms: one that forms a biphasic mixture with water and another that forms a monophasic mixture with water. The addition or removal of CO2 from SHS-based systems acts as the trigger …
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Control of molecular geometries using new photo-electro-switchable azobenzenes
There has been a recent growing interest in azobenzene derivatives because of their ability to isomerize when visible light is absorbed. This unique property allows azobenzenes to undergo reversible conformation change between the trans and cis forms upon absorbing light and slowly thermally …
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Fabrication and Study of Switchable Polymer Layers with Hydrophobic/Hydrophilic Behavior
… in the formation of self adaptive surfaces switchable in controlled environment from ultra-hydrophobic to hydrophilic energetic states. The PFS/PVP mixed brush was grafted onto the pre-treated PTFE surface (plasma etching) with the needle like topography. The size of vertical needles was at …
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The Effect of Switchable Additives on Colloidal Interactions Found in Oil Sands
… an investigation of how carbon dioxide triggered switchable additives affect colloidal interactions found in oil sands, in an effort to identify potential candidates for industrial use. Chemical force spectrometry was used to evaluate adhesion forces present in model oil sand systems. …
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First step in the design and realisation of a 'smart' switchable surface
… in the design and fabrication of a double armed switchable surface that exhibits dynamic changes in its interfacial properties in terms of bio-recognition, in response to an electrical potential (Figure 1a). The aim of the work herein is to develop a suitable synthetic strategy to ensure the …
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