26. fabrication of mesopores on gold-coated polystyrene particles

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

Primary Student
Name: Seongcheol Choi
Email: sec047@ucsd.edu
Phone: 858-534-8262
Grad Year: 2018

Abstract
A fabrication method for the preparation of mono-sized mesoporous gold-coated polystyrene (PS) particles is presented. First, mono-sized polystyrene particles having sulfate-end groups were prepared by soap-free emulsion polymerization with sodium persulfate. Second, the PS particles were imidazole-functionalized by covering them with poly-L-histidine (PLH) to convert their negative charge to positive in water. Subsequently, mono-sized silica nanoparticles were synthesized by a sol-gel method in water with L-lysine as a dispersing agent and a basic catalyst. Then, these mono-sized silica nanoparticles were electrostatically deposited in isolation on the PLH-functionalized PS particles. Finally, ultra-thin gold layers were coated on the particles. As a next step, the silica nanoparticles will be etched with sodium hydroxide solution at 80C. The morphological study of the mesoporous particles has been scrutinized and their properties as promising enzyme substrates have been analyzed. The mesopores on the surface of the PS particles are designed to serve as anchoring points for enzymes useful for desulfuration of crude oils and, thus, are of great environmental benefit.

Industry Application Area(s)
Energy/Clean technology | Life Sciences/Medical Devices & Instruments | Materials

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