Nanohybridization of Silicate Clay/AgNP for Antimicrobial and Superhydrophobic Functions
Date Issued
2016
Date
2016
Author(s)
Tsai, Kuo-Hua
Abstract
The nanohybridization of the silver nanoparticles and natural clay, MMT was found to enhance the surface adhesive properties of pristine MMT. Compared with the previously developed Ag/NSP with weight ratio of 7/93 which had high antibacterial activity and low cytotoxicity, the Ag/MMT nanohybrid showed high cross-cut adhesive property of 5B on PET and glass substrates, and was measured to have the minimum bactericidal concentration (MBC) of 910 for E.coli and 230 μg/cm2 for MRSA. The nanohybird was found to neglect its cytotoxicity to mammalian cells. The nanohybrid with high adhesive property, antibacterial activity and low cytotoxicity were allowed to cure with the epoxies for controlling the roughness on the film surface for water-repellency. The surface morphologies were observed by SEM, showing Ag/MMT had a rougher surface morphology than the pristine MMT and the addition of resin didn’t affect the roughness. Besides the control of surface roughness, the use of PIB-amine was another important factor for creating superhydrophobic films due to the hydrophobic property. The solution coating and curing process generated the polymer composite films with a water contact angle of 166o and high cross-cut adhesive properties of 5B on substrates in comparison with the previously developed material from NSP exchanged with Al3+. The involvement of the Ag/MMT nanohybrid improved the surface adhesive properties. The composites with the weight ratios of 100/0 to 30/70 could totally inhibit the cell growth of gram positive MRSA and gram negative E.coli. The composites were found to neglect their cytotoxicity to mammalian cells. Ultimately, the fabrication process of the superhydrophobic surface coating is simple and can potentially be applied to different surface for various applications.
Subjects
silicate clay
silver nanoparticles(AgNP)
coating
adhesion
antibacterial
superhydrophobic
Type
thesis