fabrication of uniform-sized mesopores on gold-coated polystyrene particles

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

Primary Student
Name: Seongcheol Choi
Email: sec047@ucsd.edu
Phone: 858-534-2930
Grad Year: 2019

A procedure to prepare gold-coated polystyrene particles, which are characterized by their mono-sized mesopores of the gold layer, is described. First, uniform-sized polystyrene particles having sulfate-end groups with sodium ions were fabricated by soap-free emulsion polymerization. Second, these polystyrene particles were covered with poly-L-histidine (PLH) in water by using an acid-base reaction between the sulfate-end groups of polystyrene surrounded by sodium counter-ions and dissociated PLH having equimolar quantity of HCl. Third, mono-sized silica nanoparticles were prepared by a two-phase sol-gel reaction, and their surface were modified with 3-glycidoxypropyl trimethoxysilane. Subsequently, these surface-modified silica nanoparticles were deposited onto the PLH-modified polystyrene particles by an electrostatic attraction, and then they strongly bond by a generation of covalent bonds at the interface between them. Finally, thin gold layers were coated on the PLH-modified polystyrene particles. As a future work, the deposited silica nanoparticles will be etched from the gold-coated polystyrene particles with excessive amounts of sodium hydroxide solution at 80C. This mono-sized mesopores in the gold layer on the polystyrene particles are specially designed to serve as sites to physically confine the enzyme called chloroperoxidase to increase their life span and enzymatic activity. This state-of-the-art enzymatic catalyst is expected to be used to reduce the energy consumption and the production cost of desulfurization in petroleum refining processes.

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

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