Gold nanoparticles (AuNPs) in spherical shape with diameter of 6-35 nm stabilized by dextran were synthesized by -irradiation method. The AuNPs were characterized by UV-Vis spectroscopy and transmission electron microscopy. The influence of pH, Au 3+ concentration, and dextran concentration on the size of AuNPs was investigated. Results indicated that the smallest AuNPs size (6 nm) and the largest AuNPs size (35 nm) were obtained for pH of 1 mM Au 3+ /1% dextran solution of 5.5 and 7.5, respectively. The smaller Au 3+ concentration favored smaller size and conversely the smaller dextran concentration favored bigger size of AuNPs. AuNPs powders were prepared by spay drying, coagulation, and centrifugation and their sizes were also evaluated. The purity of prepared AuNPs powders was also examined by energy dispersive X-ray (EDX) analysis. Thus, the as-prepared AuNPs stabilized by biocompatible dextran in solution and/or in powder form can be potentially applied in biomedicine and pharmaceutics.
Colloidal silver nanoparticles (AgNPs) with particle size less than 10 nm and concentration of 2 mM/L (~200 mg/L) were synthesized by gamma Co-60 ray irradiation of Ag + /chitosan solutions with different chitosan concentration of 0.5%, 1% and 2% (w/v). Incorporation of AgNPs onto cotton fabric was carried out by padding method with 100% wet pick-up. The content of AgNPs deposited on cotton fabric and released from cotton fabric after repeated washing was determined by inductively couple plasma-atomic emission spectroscopy (ICP-AES). The results indicated that cotton/AgNPs fabric made from padding into AgNPs solution with 0.5% -1% chitosan was the best one of AgNPs adhesion ability on cotton fabric. Results on antibacterial activity against S. aureus showed that cotton/AgNPs fabric with AgNPs content more than 100 mg/kg exhibited highly antibacterial activity (η > 98%). The mechanical property (tensile strength and elongation) of cotton/AgNPs fabrics was almost unchanged in comparison with untreated cotton fabric. Thus, the resultant cotton/AgNPs fabric with highly antibacterial activity can be potentially used as bed drapes and/or patient uniforms in hospitals, etc.
Trong bài báo này, vật liệu nano vàng (AuNPs) được tổng hợp bằng phương pháp khử hóa học sử dụng dextran với vai trò vừa là chất khử vừa là chất bảo vệ. Một số thông số ảnh hưởng tới quá trình tổng hợp nano vàng như: nồng độ axit cloroauric, nồng độ dextran, nhiệt độ, thời gian và pH của hệ phản ứng đã được nghiên cứu. Sự hình thành các hạt AuNPs, cấu trúc, hình thái của vật liệu sau khi tổng hợp được phân tích bằng các phương pháp gồm phổ tử ngoại khả kiến (UV–Vis), kính hiển vi điện tử quét (SEM), phổ tán sắc năng lượng tia X (EDX), kính hiển vi điện tử truyền qua (TEM), nhiễu xạ tia X (XRD) và phổ hồng ngoại (FT-IR). Hoạt tính xúc tác cho phản ứng khử 4-nitrophenol thành 4-aminophenol sử dụng chất khử là natri bohydrua cũng đã được khảo sát. AuNPs/dextran có độ phân tán và kích thước hạt khá đồng đều; vật liệu có hoạt tính xúc tác tốt.
In this article, a simple method for the preparation of multi-branched gold nanoparticles from an aqueous solution of silver seeds, cetyl-trimethylammonium bromide (CTAB), HAuCl 4 , and Pluronic F-127 was described. It was found that morphologies and sizes of gold nanostructures (AuNPs) depended strongly on such experimental parameters as concentrations of Pluronic F-127 and Au 3+ . The products were characterized by transmission electron microscopy (TEM). Interestingly, the multi -branched AuNPs were found to serve as an effective catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH 4 . Kinetic data have been obtained from monitoring the concentrations of 4-NP and BH 4 -by UV-vis spectroscopy.
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