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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 50 for “"sol-gel process"”.
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Siloxane modified hybrid materials by the sol-gel process
… to the fonnation of a hybrid material by the sol-gel process. The oligomeric species chosen was silanol terminated poly(dimethylsiloxane) (PDMS) and the inorganic oxide precursor chosen was titanium tetra-isopropoxide (TIP). The rationale for choosing these materials stemmed from the desire to …
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Experimental study of physical-chemical factors in the sol-gel process
… been employed to investigate the nature of the sol-gel process of tetramethyl orthosilicate; Si(OCH$\sb3$)$\sb4$; TMOS. These experiments probe changes in structural and dynamical properties at the macroscopic and microscopic level in the course of the sol-gel process and the transition state. …
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NMR studies of the chemical additives effect on the sol-gel process
Due to its unique advantages, the sol-gel process has attracted considerable attention from both technical and scientific points of view during the past decade. Compared with the conventional method, the sol-gel process can make very pure and homogeneous ceramic materials at much lower …
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In-situ steric stabilization of ultrafine titania particles synthesized by a sol-gel process
… the particle size and morphology by studying the solvent-polymer-particle surface interactions. For this purpose, the effects of polymer concentration, molecular weight, structure, and the solvent system were studied. Titanium dioxide particles were synthesized via the hydrolysis of …
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Structure-property behavior of hybrid materials incorporating oligomeric species with inorganic silicates by a sol-gel process
A sol-gel process has been utilized to develop novel hybrid materials incorporating organic and inorganic species. The objectives of this project were to study the feasibility of this new bridging route and, if successful, study the structure-property relationships of these new materials. In this …
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Preparation of silica aerogels with improved mechanical properties and extremely low thermal conductivities through modified sol-gel process
Reported silica aerogels have a thermal conductivity as low as 15 mW/mK. The fragility of silica aerogels, however, makes them impractical for structural applications. The purpose of the study is to improve the ductility of aerogels while retain the low thermal conductivity of silica aerogels. We …
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Mesoporous organosilica materials with amine functions : surface characteristics and chirality
… materials are synthesized through the silica sol-gel process. For this a new class of precursors which are also surfactant are synthesized and self-assembled. This leads to a high surface area functionality which is analysized with copper (II) and water adsorption.
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Multinuclear NMR Investigations of Sol-Gel Systems
… and polymerization of metal alkoxides in solution to form a gel, which may then be fired to form a glass. This so-called sol-gel process represents the synthesis of an inorganic polymer in a manner analogous to that in which organic polymers have traditionally been prepared.
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Application of Calcium Phosphate based gels for encapsulation of therapeutic molecules
… applications. Amongst CaP based materials, CaP gels made by the sol-gel process have attracted much interest since they can be processed at room temperature allowing the incorporation of environmentally sensitive molecules such as growth factors. CaP gels can be engineered by changing process …
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Silicon-based organic and inorganic polymers
… hybrid networks using a low temperature solution technique known as the sol-gel process. During this process, hydrolysis and subsequent condensation of inorganic alkoxides (most often tetraethylorthosilicate, TEOS) in the presence of catalysts leads to the formation of three-dimensional …
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Structure-property behavior of sol-gel derived hybrid materials
… were carried out on a number of different hybrid sol·gel materials. Multifunctional silicon ethoxides were prepared and studied by solid state ²⁹Si NMR and Raman spectroscopy to determine the type of silicate structures formed and the degree of conversion attained by the sol-gel process under …
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Processing - structure - property interrelationships of ferroelectric thin films with emphasis on formation kinetics
… electronic memories. In this study, a sol-gel process for PZT film preparation was adopted and greatly modified. PZT films with very desirable electrical properties have been successfully prepared by this modified sol-gel process. One of the problems of incorporating PZT films into the …
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Optothermal Characterization of Nanoparticle Infused Aerogels
Here, custom fabricated nanoparticle infused aerogels are presented as a potential material to achieve super insulating and transparent opto-thermal properties. By incorporating nanoparticle solutions within the silicon dioxide (SiO₂) aerogel during the sol-gel process, unique monolithic samples …
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Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… can reduce the performance of the amplifier. Sol-gel chemistry, combined with the dip-coating method is a means to develop rare-earth doped planar waveguides for such integrated optics components. The sol-gel process involves three main steps: first, a metal alkoxide (Si-alkoxide) in …
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Hierarchical Assembly of Polymeric Nanofibers for Advanced Material Applications
… Parameter (STEP) technique. By adjusting the processing parameters such as relative humidity, solvent volatility and polarity, porous polymer tubes are demonstrated having large specific surface areas. Combining STEP with sol-gel process, aligned inorganic nanofibers, such as Titanium Oxide …
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Nonaqueous synthesis of metal oxide nanoparticles and their assembly into mesoporous materials
… metal oxide nanoparticles via nonaqueous sol-gel process and the formation of mesoporous metal oxides using some of these nanoparticles as building blocks via evaporation induced self-assembly (EISA) technique. In the first part, the experimental procedures and characterization results of …
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Fabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranes
… (PAl) and 6F-poly(amide-imide) (6FPAl) by a sol-gel process. The composite films showed a high optical transparency. The morphology of the Ti0₂ rich domains was observed by transmission electron microscopy (TEM). The Ti0₂ rich domains were well dispersed within the poly(amide-imide) and …
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Barium Titanate-Based Magnetoelectric Nanocomposites
… prepared by pulsed laser deposition (PLD) and sol-gel process. BTO-ferrite nanocomposites were grown by solid state reaction. Furthermore, BTO-metal nanostructures were also synthesized by solid state reaction under hydrogen gas which gave us a great inspiration to fabricate metal-ceramic …
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DEVELOPMENT OF A NEW CHIRAL MONOLITHIC CAPILLARY COLUMN AND A FLUORESCENCE SPECTROSCOPIC STUDY OF A SELECTIVE OFF-ON PET SENSOR FOR THE DETECTION OF ZINC IONS
… column was developed using a monolithic silica gel as a column substrate for chiral separation by covalently modifying with (S, S)-Whelk-O1 chiral selector. The monolithic stationary phase was generated through a sol-gel process and prepared in situ in a 100 µm i.d. fused silica capillary …
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Doped Titanium Oxide Photcatalysts: Preparation, Structure and Interaction With Viruses
… photocatalytic efficiency and ease of the doping process. Two major approaches were used in the material synthesis and processing, including the ion-beam-assisted-deposition (IBAD) technique and sol-gel based processes. Both nitrogen-doped TiO2 (TiON) and nitrogen/palladium co-doped TiO2 …
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