Thermo-responsive nanoarrays of silver nanoparticle, silicate nanoplatelet and PNiPAAm for the antimicrobial applications.

Author(s) Lin, H.C.; Su, Y.A.; Liu, T.Y.; Sheng, Y.J.; Lin, J.J.
Journal Colloids Surf B Biointerfaces
Date Published 2017 Apr 01
Abstract

The ternary nanohybrids of silver nanoparticles (AgNPs) in combination with silicate nanoplatelets (NSP) and thermally sensitive poly(N-isopropylacrylamide) (PNiPAAm) were fabricated for antibacterial applications. PNiPAAm were chemically grafted on the NSP by atom-transfer radical polymerization (ATRP) via polymerizing N-isopropylacrylamide monomers with sol-gel linkers (BBTES). The nanoparticles of AgNPs then were adsorbed on NSP-PNiPAAm nanosheets through in situ reduction reaction of AgNO3 in aqueous dispersion. The particle sizes of AgNPs were estimated to be 7-12nm in diameter with different composition ratios of AgNPs to NSP-PNiPAAm, evaluated by transmission electron microscope (TEM). The nanohybrids of AgNP/NSP-PNiPAAm exhibited the unique property of lowest critical solution temperature (LCST) at 32°C. The thermo-responsive antibacterial efficacy of the ternary nanohybrids was demonstrated by Bacillus subtilis (B. subtilis) and Escherichia coli (E. coli) at lower than the LCST (28°C) and higher than the LCST (37°C). The result show that the great antibacterial ability was observed in the hydrophilic bacteria (B. subtilis) at 28°C. In contrast, the excellent antibacterial ability was found in the hydrophobic bacteria (E. coli) at 37°C, due to the surface energy modulation of AgNP/NSP-PNiPAAm. The tailoring of silver-containing ternary nanohybrids allow the new antibacterial nanomaterials to selectively affect the surface of bacteria by varying temperature.

DOI 10.1016/j.colsurfb.2017.01.046
ISSN 1873-4367
Citation Lin H-, Su Y-, Liu T-, Sheng Y-, Lin J-. Thermo-responsive nanoarrays of silver nanoparticle, silicate nanoplatelet and PNiPAAm for the antimicrobial applications. Colloids Surf B Biointerfaces. 2017;152:459-466.

Related Applications, Forms & Industries