University of Ljubljana, Faculty of Natural Sciences and Engineering, Department of Textiles, Aškerčeva 12, 1000 Ljubljana, Slovenia.
National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia.
Carbohydr Polym. 2017 Mar 1;159:161-170. doi: 10.1016/j.carbpol.2016.12.030. Epub 2016 Dec 15.
Silver nanoparticles were embedded into a temperature- and pH-responsive microgel based on poly-(N-isopropylacrylamide) and chitosan (PNCS) before or after its application to cotton fabric to create a smart stimuli-responsive textile with simultaneous moisture management and controlled antimicrobial activities. Two different methods of silver embedment into the PNCS microgel using two different forms of silver nanoparticles were studied, i.e., in-situ synthesis of AgCl nanocrystals into PNCS microgel particles that had previously been applied to cotton fabric, as well as the direct incorporation of colloidal silver into the microgel suspension prior to its deposition on cellulose fibres. SEM and FT-IR analysis were employed to determine the morphological and chemical changes of the modified cotton fibres, while EDS and ICP MS analysis were used to confirm the presence of the silver nanoparticles. The influence of silver embedment on the swelling/deswelling activity of the PNCS microgel was studied using the temperature- and pH-responsiveness, as determined by the moisture content, water vapour transmission rate and water uptake. The antimicrobial activity against the bacteria Staphylococcus aureus and Escherichia coli was assessed. Regardless of the embedment technique, the presence of silver nanoparticles resulted in impaired moisture management activity of the studied microgel. The PNCS microgel proved to be a suitable carrier of antimicrobial agents, assuring the effective controlled release of silver triggered by changes in the temperature and pH of the surroundings, which granted the cotton fabric excellent antimicrobial activity against Gram-negative E. coli (>99%) and Gram-positive S. aureus (>85%).
将银纳米颗粒嵌入到基于聚（N-异丙基丙烯酰胺）和壳聚糖（PNCS）的温敏和 pH 响应性微凝胶中，然后将其应用于棉织物上，以创建一种具有同时具有湿度管理和控制抗菌活性的智能刺激响应性纺织品。研究了两种不同的将银嵌入到 PNCS 微凝胶中的方法，即：将 AgCl 纳米晶体原位合成到已经应用于棉织物的 PNCS 微凝胶颗粒中，以及在将胶体银沉积到纤维素纤维上之前直接将其掺入到微凝胶悬浮液中。SEM 和 FT-IR 分析用于确定改性棉纤维的形态和化学变化，而 EDS 和 ICP MS 分析用于确认银纳米颗粒的存在。通过水分含量、水蒸气透过率和吸水率来研究银嵌入对 PNCS 微凝胶的溶胀/收缩活性的影响，以确定其温敏和 pH 响应性。评估了其对金黄色葡萄球菌和大肠杆菌的抗菌活性。无论嵌入技术如何，银纳米颗粒的存在都会导致所研究的微凝胶的保湿管理活性受损。PNCS 微凝胶被证明是一种合适的抗菌剂载体，能够在周围温度和 pH 值发生变化时有效控制银的释放，这使棉织物对革兰氏阴性大肠杆菌（>99%）和革兰氏阳性金黄色葡萄球菌（>85%）具有出色的抗菌活性。
