Tổng hợp và khảo sát khả năng kháng khuẩn của nano bạc trong sơn nước nội thất
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Abstract
In this study, spherical Ag nanoparticles (Ag NPs) with sizes of 8 – 12 nm as an antibacterial additive for indoor waterborne architectural coating have been successfully synthesized by chemical reduction method. This simple and environmentally friendly process is performed with a reducing agent and a protective agent that is glucose (concentration of 0.4%) and hydroxypropyl methylcellulose (HPMC_concentration of 0.01%), respectively. Next, nano silver solution was added to the paint before adding the emulsion resin. This method maintains the chemical and physical properties of the paint while enhancing the antimicrobial ability from nano silver in the paint. The effectiveness of nano silver as an antibacterial additive for emulsion paints was evaluated on Escherichia coli and Bacillus subtilis using an antibacterial ring method, respectively. The results showed that the emulsion paint was bactericidal with the nano silver content of 0.1 – 0.5 ppm in the paint. The antimicrobial effect of nano silver in the emulsion paint was maintained for a minimum period of 30 days.
Tóm tắt
Trong nghiên cứu này, hạt nano Ag (AgNPs) hình cầu với kích thước từ 8 – 12 nm đã được tổng hợp thành công bằng phương pháp khử hóa học để làm phụ gia kháng khuẩn cho sơn nhũ tương nội thất. Phương pháp đơn giản và thân thiện với môi trường này được tiến hành với tác nhân khử và chất bảo vệ là glucose (nồng độ 0,4%) và hydroxypropyl methylcellulose (HPMC với nồng độ 0,01%). Tiếp đến, dung dịch nano bạc được cho vào sơn trước khi thêm nhựa nhũ tương. Phương pháp này vẫn duy trì các tính chất lý hóa của sơn, đồng thời vẫn thêm khả năng kháng khuẩn của nano bạc trong sơn. Hiệu quả của nano bạc với vai trò phụ gia kháng khuẩn cho sơn nhũ tương được thử nghiệm lần lượt trên Escherichia coli và Bacillus subtilis thông qua phương pháp vòng kháng khuẩn. Kết quả cho thấy sơn nhũ tương có khả năng diệt khuẩn khi hàm lượng nano bạc trong sơn là 0,1 – 0,5 ppm. Hiệu quả kháng khuẩn của nano bạc trong sơn nhũ tương được duy trì trong khoảng thời gian tối thiểu là 30 ngày.
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