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Novel mold‐resistant building materials impregnated with thermally reduced nano‐silver
Author(s) -
Chen Y.C.,
Yu K.P.,
Shao W.C.,
Tseng C.H.,
Pan W.C.
Publication year - 2018
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/ina.12443
Subject(s) - mold , silver nanoparticle , chemistry , antifungal , aspergillus niger , penicillium , nuclear chemistry , titanium dioxide , metallurgy , food science , materials science , microbiology and biotechnology , composite material , nanoparticle , nanotechnology , biology
In this study, we evaluated the long‐term antifungal effectiveness of 3 types of interior building materials (gypsum board [ GB ], cement board [ CB ], and softwood plywood [S‐ PW ]) impregnated with thermally reduced silver nanoparticles supported by titanium dioxide (Ag NP s/TiO 2 ) under 95% relative humidity for 4 weeks. Ag NP s/TiO 2 was synthesized at 2 thermal reduction temperatures ( TRT s, 120 and 200°C) with 2 different Ag NP weight percentages (2 and 5 wt%). Four different silver‐loading levels ( SLL s, 0.025, 0.05, and 0.5 μg/cm 2 and the critical concentration required to inhibit fungal growth on agar plates) and 3 fungal species ( Aspergillus niger , Penicillium spinulosum, and Stachybotrys chartarum ) were used in the experiments. Higher temperature reduced more ionic Ag + to metallic Ag 0 and increased the dispersion of Ag on TiO 2 surface. The 200°C thermally reduced Ag NP s/TiO 2 demonstrated excellent antifungal efficiency: Mold growth was almost completely inhibited for 28 days at the low SLL of 0.5 μg/cm 2 . Additionally, Ag NP s/TiO 2 exhibited higher antifungal activity on GB and CB than on S‐ PW . The stepwise regression results indicated that the TRT of Ag NP s/TiO 2 (β = −0.739 to −0.51), the SLL (β = −0.477 to −0.269), and the Ag 0 level in the Ag NP s (β = −0.379 to −0.136) were the major factors influencing antifungal activity and TRT might be the most significant one.