35. ELECTRICALLY-CONDUCTIVE MESOPOROUS CERAMICS FOR ENZYME CATALYSIS

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

Primary Student
Name: Shuang Qiao
Email: s1qiao@ucsd.edu
Phone: 858-900-7331
Grad Year: 2017

Student Collaborators
Ekaterina Novitskaya, eevdokim@ucsd.edu | Flor Sanchez, florgsa@gmail.com

Abstract
The use of electrically conductive mesoporous ceramic powders is a new way for enzyme immobilization aiming for biocatalysts. 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 Brunauer?Emmett?Teller (BET) method and were in the range of 4-13 nm. Additionally, indium oxide, zinc oxide and titanium dioxide were doped with tin, gallium, and silver/niobium, respectively, in order to obtain different ranges of electrical conductivity. The introduction of dopant impurities increases the semiconductor carriers concentration and can result in increased electrical conductivity. This is the first time different kinds of doped mesoporous ceramic powders with low to high electrical conductivity have been synthesized and tested for enzyme stability and biocatalyst behavior.

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