The Oligomer Polyacrylic Acid Effect on Immobilization of Silver Nanoparticles onto Cotton Fabric to Achieve a Durably A
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
The Oligomer Polyacrylic Acid Effect on Immobilization of Silver Nanoparticles onto Cotton Fabric to Achieve a Durably Antibacterial Function Lin Li1, Panpan Duan1, Qingbo Xu1, XuJun Zhang2, JiaNing Chen2, Feiya Fu1, HongYan Diao2*, and Xiangdong Liu1* 1
Institute for Smart Fiber Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China 2 State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China (Received October 22, 2019; Revised January 5, 2020; Accepted January 9, 2020) Abstract: Aiming to a durably antibacterial function, stable immobilization of silver nanoparticles (Ag NPs) on cotton textiles still represents challenging in textile industry. In the present work, by grafting oligomeric polyacrylic acid (PAA) onto cotton fiber surfaces, we effectively prepared the Ag NPs with controllable size on the fiber surface, which are of average size of 16.43 nm, and therefore achieved a desirable antibacterial durability. The oligomer PAA binder can give the modified fabrics with a remarkable antibacterial durability against washing, as the bacterial reduction rates against both Staphylococcus aureus and Escherichia coli remained over 90 % even after 50 laundering cycles. Moreover, this graft to approach using oligomeric PAA shows merits in maintaining the desired cotton properties such as flexibility, water absorptivity and vapor permeability. Finally, this finishing process ensures a reliable safety for human skin. Keywords: Cotton fabric, Surface modification, Oligomer polyacrylic acid, Antibacterial durability
ions released from the Ag NPs [33]. Therefore, how to achieve a stable immobilization of the Ag NPs onto cotton fabric is a challenging problem for developing cotton textiles [34,35]. In the past decade, various strategies have been proposed to improve the adhesion of Ag NPs with cotton fabric. For example, Montazer et al. [36] used 1,2,3,4butanetetracarboxylic acid (BTCA) to immobilize Ag NPs onto cotton fabric. However, significant decrease in the antibacterial rate was observed after 30 washing cycles. ElRafie et al. [37] developed a method to coat cotton fabrics with Ag NPs. The silver content of the fabric treated with 100 PPM Ag NP was about 100 mg/kg fabric. It was found that the antibacterial activity of unwashed samples was above 95 %. However, the inhibition rate was reduced to 85 % after only 20 washing cycles. The lack of covalent bonds with cotton fabric, the high surface energy of the Ag NPs, and aggregation to larger particle are thought as the reasons for the weak affinity of the Ag NPs onto cotton fabric. Xu et al. [38] used chitosan derivatives as binder to fix Ag NPs, their results indicated that bacteria reduction rate (BR) of the modified cotton fabrics are more than 95 % even af
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