Fabrication of multifunctional antimicrobial surfaces via integration of superhydrophobic etching and ZnO nanoparticle coating

Name: Luanghane, Lorvanhsith

LCSH: Kasetsart University -- Theses. M.Eng. (Materials Engineering) 2022

Classification :.LCCS: TA418.9.N35

LCSH: Kasetsart University. -- Department of Materials Engineering -- Theses

LCSH: Nanostructured materials

LCSH: Nanoparticles

LCSH: Zinc oxide

LCSH: Hydrophobic surfaces

LCSH: Surfaces (Technology)

LCSH: Microorganisms

Abstract: Various studies have reported that a reduction of infection on contaminated surfaces can be conducted by different methods. Nanoprotrusive structures can prevent microbial attachment by its excellent mechanical rupture. Superhydrophobic surface is also considered an efficient approach to reduce microbial adhesion on the surface. Metal oxide nanoparticle coating is an alternative way of killing microbes on the surfaces by its outstanding chemical performances. Hence, integrating the superhydrophobicity and metal oxide nanoparticle coating would be an effective fabrication to enhance antimicrobial performance on the surfaces by not only the physical performance but also the chemical performance. The aim of this study was to fabricate the multifunctional antimicrobial surfaces by integrating superhydrophobicity via chemical etching and anodizing processes followed by ZnO nanoparticle coating via an electrodeposition. According to the experimental procedure, the stainless steel 304 specimens in size 2 cm x 2 cm x 0.1 cm were clean up by diluted nitric acid (HNO3) to remove contaminants and then they were etched in myristic acid for 48 h to initially modify the surface. Next, the specimens were anodized at 3.5 V for 20 mins with 0.7 M diluted HNO3. After that, they were electrodeposited at -1.5 V with varied time from 20 to 60mins in ZnO nanoparticle solution. After completing surface modification, the specimens were characterized their morphologies, topographies, phase identification, contact angle and abrasive resistance. The next step was to examine the E. coli and S. aureus bacterial adhesion efficiencies of the specimens by a spread plate method with a colony forming units. The SEM results indicated the sharp nanoprotrusive structures of the etched and anodized for 20 mins (EA20m) specimen and spherical shape of ZnO on the etched, anodized, and ZnO electrodeposited for 60 mins (EAD60m) specimen's surface. The 134 degrees was the maximum contact angle of the EAD20m specimen, but its antimicrobial adhesion efficiency was inefficacious on both of E. coli and S. aureus bacteria. However, the most effectual specimen in this study was the EAD60m due to its 126.3 degrees of contact angle with uniformed roughness and 54.17% efficiency of E. coli reduction only.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Naray Pewnim

Role: Thesis Advisor

Created: 2022

Modified: 2025-07-20

Issued: 2025-07-20

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2564/lorvanhsith-lua-all.pdf

CallNumber: TA418.9.N35 .L83

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Materials Engineering

Grantor: Kasetsart University

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