Thesis for the Degree of Master of Engineering
Hybrid Method of Electrophoretic and Electrostatic Deposition of Nanomaterials for Multifunctional Surfaces: Development of Antimicrobial and Hydrophobic Nanoparticle Bilayers to Prevent Pathogenic Bacteria Invasion
by
Jeeyoon Kim
In charge of major work: Young Soo Joung
December 2019
Department of Mechanical Systems Engineering
The Graduate School
Sookmyung Women's University
ABSTRACT
We developed a hybrid method of electrophoretic and electrostatic depositions of nano-materials to produce anti-wetting and anti-bacterial fabrics. Clothing and textiles used for medical and healthcare purposes must be prevented from the contamination of pathogenic bacteria which can infect others through direct contact. Therefore, it is essential to use the functional fabric capable of resisting bacteria to prevent secondary infection. In this work, anti-bacterial fabrics with superhydrophobicity were produced by electrophoretic depositions (EPD) of zinc oxide (ZnO) and polydimethylsiloxane (PDMS) modified silicon dioxide (SiO2) nanoparticles on the polymerically modified fabric surfaces with electrostatic deposition. The produced fabrics have super-hydrophobicity with excellent anti-bacterial performance. The outer layer of SiO2 prevents the direct attachment of bacterial droplets, and the inner layer of ZnO provides the anti-bacterial activity for the residual bacteria on the outer surface of the SiO2 layer. As a result, the fabrics developed can eliminate the possibility of bacterial-attachment and biological-viability, simultaneously, thereby effectively reducing the risk of bacterial infection. Our method can deposit various nanoparticles for the desired functions on non-conductive surfaces such as fabric and paper with precise control of the coating thickness and the nano/micro-structures, unlike the conventional EPD and fabric coating methods. In addition, depending on the electrode size and shape, we can control the area and pattern of functional surfaces; therefore, it has a significant advantage of the mass production of functional fabrics without destroying the original characteristics of the fabrics after functionalization. The hybrid method can be applied to a variety of supplies such as fabrics and filters commonly use in biological contaminations and can give us enormous opportunities to develop new functional commercial products.
Keywords: electrophoretic deposition, antimicrobial, antibacterial, anti-wetting, functional fabric, nanoparticle coating.
http://www.dcollection.net/handler/sookmyung/000000068950