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.
Results
Showing 1 to 20 of 26 for “"Solvent Exchange"”.
-
Preferential nanoreinforcement of thermoplastic polyurethane elastomers with dispersed nano-clay
… thermodynamic and kinetic limitations. A novel solvent exchange method to fully exfoliate and disperse discotic smectic clay, Laponite (diameter = 25 nm, thickness = 1 nm), in three thermoplastic polyurethane elastomers (TPUs) -- Elasthane 80A, HDI-PTMO PU, and PU-1-33 -- has been developed. …
-
Processing Approaches for Maintaining Multifunctionality in Advanced Thermoplastic Composites
… successfully accept the functional particle. In solvent casting, this particle dispersion in the matrix is often controlled through a solvent exchange step, as particles must frequently be transferred from a suspension or colloid that is not miscible with the desired polymer matrix to a solvent …
-
Acing nucleic acids and chemistry : exogenous RNA/DNA acetylation and modeling universal data formats.
… aim to determine the rate of the amide proton-solvent exchange rate of acetylated nucleic acids. Amide hydrogen/deuterium exchange has been studied on proteins for decades but has not been studied on RNA and DNA due to the relatively low abundance of naturally occurring acetylated nucleic …
-
Thermomechanics of nano-filled elastomers
… that constitute the elastomeric matrix. Using a solvent exchange technique we show that it is possible to preferentially nanoreinforce the hard micro-domains of thermoplastic elastomers with smectic clay nanofillers that have characteristic dimensions similar to the hard segment. The adhesion …
-
Characterization of C60 Nanoparticles in Aqueous Systems
… synthesized using intermediate organic solvents, this work primarily employed an aggregate production method that more closely emulates the fate of C60 upon accidental release into the environment — extended mixing in water. The aggregates formed via this method (aqu/nC60) differ from …
-
NOVEL SYNTHETIC METHODS AND APPLICATIONS OF POROUS MATERIALS: AEROGEL FOAMS, METALLIC AEROGELS, AMORPHOUS AND GRAPHITIC CARBON AEROGELS
… aerogels-via-xerogels allows to speed-up the solvent exchange process and bypasses supercritical fluid drying, resulting in time, energy, and materials efficient methodology. At their best, these carbon aerogels have high BET surface area (up to 1934 m<sup>2</sup> g<sup>-1</sup>), porosities …
-
Developments in White Pigment Production Using Biocompatible Cellulose-Based Materials
… Lastly, a novel method termed as "organic solvent mixing" was developed using cellulose microparticles (CMPs) with optimised scattering dimensions. This proposed method combines the concepts of evaporation-induced phase separation and solvent exchange to address the issue of densification …
-
Synthesis and applications of ceramic (silicon carbide and silicon nitride), metallic (cobalt(0)) and polymeric (polyurethane) aerogels
… powders. The process is time efficient as solvent-exchange through powders is fast, and energy efficient as it bypasses drying with supercritical fluids. The final ceramic objects were chemically pure, sturdy, with compressive moduli at 37 ±7 MPa and 59 ± 7 MPa, and thermal conductivities …
-
Photodetection and Spectrometry at the Nanoscale
… by liquid-phase-exfoliation. Optimisation of a solvent-exchange method facilitates conversion of these dispersions into inks, which can be reliably inkjet printed to produce highly uniform black phosphorus films without significant flake degradation. Parylene-C encapsulation of these films …
-
Advances in the Stille reaction and new methods for continuous flow Pd-catalyzed C-N bond forming reactions
… The microfluidic distillation enabled solvent exchange from CH2Cl2 in the first reaction step to N,N-dimethylformamide (DMF) in the final reaction step. Chapter 4: A method to mitigate clogging of microsystems during Pd-catalyzed C-N bond-forming reactions under continuous flow …
-
Morphology-Property Relationships in Semicrystalline Aerogels of Poly(ether ether ketone)
… aerogels of PEEK were prepared through simple solvent exchange and solvent removal of the PEEK/DCA or PEEK/4CP gels. Solvent removal utilized freeze-drying (sublimation) methods or supercritical CO2 drying methods. Varying the weight fraction of PEEK dissolved in solution determined PEEK …
-
Characterization of Methyltrimethoxysilane Sol-Gel Polymerization and the Resulting Aerogels.
… The effects of pH, water concentration, type of solvents, and synthesis procedures (single step acid catalysis and two-step acid/base catalysis) on MTMS polymerization were discussed. The reactivity of silicon species with different connectivity and the extent of cyclization were found to depend …
-
Synthesis and Characterization of Crystalline Coordination Networks Constructed From Neutral Imidazole Containing Ligand and Rigid Aromatic Carboxylate
… of starting materials and different solvents. In 4.4-4.6, L3 serves as a pillar building block to construct 3D networks by applying with H₃BTC ligand. The solvent exchange experiment for 4.4 is further discussed.
-
Fabrication and characterization of cellulose nanocrystal enhanced sustainable polymer nanocomposites through surface chemistry and processing
… cured specimens, residual water from the solvent exchange process plasticized the epoxy matrix. However, CNC was able to maintain and even improve the mechanical properties.</p> <p>To further improve compatibility, CNCs were surface modified through various esterification methods to graft …
-
BISMUTH-FUNCTIONALIZED SORBENTS FOR RADIOIODINE CAPTURE
… of oil, oil rich regions form a macroscale pore. Solvent exchange and calcination were performed to remove oil from silica xerogels. TEOS precursor gave isolated but larger pores while TEOS + MTMS precursor gels gave finer and interconnected pores. As a result of finer pore structure gels made …
-
Characterization of Cellulose and Chitin Thin Films and Their Interactions with Bio-based Polymers
… often studied in its place. In this work, QCM-D solvent exchange studies showed that water contents of RC, SNC and DNC films were proportional to the film thickness (d). Accessibility and degradation of the films was further analyzed via substrate exposure to cellulase. Cellulase adsorption onto …
-
Manufacturing synthetic Hagfish slime skeins using embedded 3D printing
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
-
Renewable Natural Polymer Thin Films and Their Interactions with Biomacromolecules
… chitin colloidal suspension onto solid surfaces. Solvent exchange experiments via QCM-D with H2O/D2O revealed that Chitin NC films had more water than RChitin films of similar thickness. Results from QCM-D demonstrated that Chitin NC films had high bovine serum albumin loading capacity, and …
-
Exploring the Structural, Magnetic, Optical, and Catalytic Properties of High-Spin Materials
… acid (H2L2.1). Systematic post-synthetic solvent exchange led to tunable structural perturbations that profoundly affected the magnetic relaxation dynamics and photophysical behavior of the Dy-MOF. Alternating current (ac) magnetic studies of the Dy-MOF series revealed distinct relaxation …
Page 1 of 2