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Formation of Silica Microstructures between Inundated Stressed Silica Grains: Effect on Intergranular Tensile StrengthGuo, Rui January 2014 (has links)
<p>Laboratory tests on microscale are reported in which amorphous silica grains were compressed in a liquid environment, namely in solutions with different silica ion concentrations for up to four weeks. Such an arrangement represents an idealized representation of two sand grains. The grain surfaces and asperities were examined in Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) for fractures, silica polymer growth, and polymer strength. Single chains of silica polymers are found to have a failure pulling force of 330 - 450 nN. </p><p>A chain of observations are reported for the first time, using Pneumatic Grain Indenter and Grain Indenter-Puller apparatuses, confirming a long-existing hypothesis that a stressed contact with microcracks generates dissolved silica in the contact (asperity) vicinity, which eventually polymerizes, forming a structure between the grains on a timescale in the order of weeks. Such structure exhibits intergranular tensile force of 1 - 1.5 mN when aged in solutions containing silica ion concentrations of 200- to 500 ppm. Stress appears to accelerate the generation of silica polymers around stressed contact regions, so does mica-silica contacts. The magnitude of intergranular tensile force is 2 to 3 times greater than that of water capillary effect between grains.</p> / Dissertation
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Syntesis of hybrid silica-organic materials for the development of electrochemical biosensing applicationsDjelad, Halima 27 September 2019 (has links)
No description available.
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Novel Polymer–Silica Composite-Based Bifunctional Catalysts for Hydrodeoxygenation of 4-(2-Furyl)-3-Buten-2-One as Model Substance for Furfural–Acetone Aldol Condensation ProductsGoepel, Michael, Ramos, Ruben, Gläser, Roger, Kubiˇcka, David 06 April 2023 (has links)
Novel bifunctional metal-loaded polymer–silica composite (PSC) catalysts were investigated
in the hydrodeoxygenation (HDO) of 4-(2-furyl)-3-buten-2-one (FAc) as a model substance for
furfural–acetone aldol condensation products. PSC catalysts were synthesized via a sol–gel method
with different polymer contents and subsequently doped with different noble metals. The product
composition of the HDO of FAc could be tuned by using catalysts with different polymer (i.e., acidic
properties) and metal content (i.e., redox properties), showing the great potential of metal-loaded PSC
materials as tunable catalysts in biomass conversions with complex reaction networks. Furthermore,
high yields (>90%) of the fully hydrodeoxygenated product (n-octane) could be obtained using noble
metal-loaded PSC catalysts in only 8 h of reaction time.
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