electrical conductivity of stabilized mesoporous ceramic fluid suspensions with varying ph values

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: CaliBaja Center for Resilient Materials & Systems
Faculty Advisor(s): Olivia A. Graeve

Primary Student
Name: Shuang Qiao
Email: s1qiao@ucsd.edu
Phone: 858-234-0146
Grad Year: 2018

The use of electrically conductive mesoporous ceramic powders is a new way for enzyme immobilization aiming for biocatalysts. In this study, mesoporous indium oxide, zinc oxide and titanium dioxide were synthesized by use of a hydrothermal reaction environment. Soft-template and hard-template methods were utilized to enable mesoporous materials with varying pore sizes. Parameters such as calcination temperature and precursor amounts changed the embedded template size, thus affecting the powder pore sizes. Pore sizes were evaluated by the Brunauer?Emmett?Teller (BET) method and were in the range of 4 to 13 nm. Additionally, indium oxide, zinc oxide and titanium dioxide were doped with tin, gallium, and silver/niobium, respectively, to obtain different ranges of electrical conductivity. The introduction of dopant impurities increases the semiconductor carrier concentration and can result in increased electrical conductivity. Afterwards, mesoporous suspensions with varying particle concentrations and pH values were produced through magnetic stirring and ultrasonication. Their electrical conductivities were measured with a bench meter electrical conductivity system. Particle size and zeta potential of the suspensions were also measured using dynamic light scattering (DLS). Correlations between particle size distribution, suspension stability and electrical conductivities are summarized.

Industry Application Area(s)
Energy/Clean technology | Materials

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