Amphiphilic comb-like polymer for harvest of conductive nano-cellulose
Amphiphilic comb-like polymer for harvest of conductive nano-cellulose
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DOI：
10.1016/j.colsurfb.2011.09.008
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发表时间：
2012-01-01
影响因子：
5.8
通讯作者：
Hyun, Jinho
中科院分区：
文献类型：
--
作者：
Choi, Jaeyoo;Park, Subeom;Hyun, Jinho
在本研究中，通过在碳纳米管(CNT)分散的介质中培养木糖乙酸杆菌来制备导电细菌纤维素(BC)。在非离子两亲性梳状聚合物(CLP)存在下，采用非共价方式分散了碳纳米管。具体地说，CLP的疏水主链以化学物理方式附着在碳纳米管表面，亲水侧链在水环境中向介质自由释放。CLP修饰的碳纳米管很稳定，即使在15,000转/分的离心30分钟后也没有明显的沉淀物。值得注意的是，CLP修饰的碳纳米管的分散溶液在室温下几个月都是稳定的，这是因为聚合物修饰管之间的长程熵排斥作用起到了聚集的屏障作用。用场发射扫描电子显微镜对BC膜的形貌进行了研究。用傅里叶变换红外光谱表征了碳纳米管表面CLP的存在，并用四探针法测量了碳纳米管负载BC膜的电导率。(C)2011爱思唯尔B.V.保留所有权利。
In this study, electrically conductive bacterial cellulose (BC) was prepared by culturing Gluconacetobacter xylinus in a carbon nanotube (CNT)-dispersed medium. The CNTs were dispersed by adopting a non-covalent approach in the presence of non-ionic amphiphilic comb-like polymer (CLP). Specifically, the hydrophobic backbone of CLP was chemophysically attached to the surface of the CNTs and the hydrophilic side chains were released freely toward the medium in an aqueous environment. CLP-modified CNTs were stable and did not show any noticeable sediment, even after centrifugation at 15,000 rpm for 30 min. Notably, the dispersion solution of CLP-modified CNTs was stable at room temperature for several months because the long-range entropic repulsion among polymer-decorated tubes acted as a barrier to aggregation. The morphology of the BC membrane was studied by field-emission scanning electron microscopy. The presence of CLP bound to the CNT surface was characterized by Fourier transform infrared spectroscopy and the conductivity of the CNT-incorporated BC membrane was measured by four-probe measurements. (C) 2011 Elsevier B.V. All rights reserved.