Adhesive Layer-by-Layer Films of Carboxymethylated Cellulose Nanofibril Dopamine Covalent Bioconjugates Inspired by Marine Mussel Threads
Adhesive Layer-by-Layer Films of Carboxymethylated Cellulose Nanofibril Dopamine Covalent Bioconjugates Inspired by Marine Mussel Threads
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DOI：
10.1021/nn204620j
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发表时间：
2012-06-01
期刊：
影响因子：
17.1
通讯作者：
Wagberg, Lars
中科院分区：
文献类型：
--
作者：
Karabulut, Erdem;Pettersson, Torbjorn;Wagberg, Lars
在过去的十年中，用可持续、低成本的原材料制备多功能薄膜和涂层引起了人们的极大兴趣。在这方面，基于纤维素的产品具有巨大的前景，不仅因为自然界中存在大量纤维素，而且还因为从树木或一年生植物中制备了新型纳米级且特征良好的纤维素结构单元。然而，为了充分利用这些纳米材料的固有特性，需要简单且可持续的制备途径。在这项工作中，制备了羧甲基化纤维素纳米纤丝（CNFC）和多巴胺（DOPA）的仿生混合缀合物，并与支化聚电解质聚乙烯亚胺（PEI）结合构建了这些改性纳米纤丝的逐层（LbL）薄膜，以获得坚固、粘合和湿稳定的材料。 固体表面上的纳米涂层。结果表明，CNFC 与 DOPA 分子的化学功能化改变了它们在液体分散体和界面处的常规特性，并且还影响了 LbL。通过减少静电相互作用来形成薄膜。尽管由于电荷抑制，CNFC-DOPA 缀合物在水分散体中表现出较低的胶体稳定性，但可以通过结构单元的连续沉积来制备 LbL 薄膜。在存在 Fe3+ 的情况下，使用化学功能化的 CNFC 制备的多层膜与二氧化硅探针之间的粘附力比由未改性的纳米纤丝制备的多层膜与二氧化硅探针之间的粘附力强得多。目前的工作展示了一种制备化学功能化纤维素纳米纤丝的简便方法，通过更广泛的应用可以生产具有不同功能的新型纤维素基材料。
The preparation of multifunctional films and coatings from sustainable, low-cost raw materials has attracted considerable interest during the past decade. In this respect, cellulose-based products possess great promise due not only to the availability of large amounts of cellulose in nature but also to the new classes of nanosized and well-characterized building blocks of cellulose being prepared from trees or annual plants. However, to fully utilize the inherent properties of these nanomaterials, facile and also sustainable preparation routes are needed. In this work, bioinspired hybrid conjugates of carboxymethylated cellulose nanofibrils (CNFC) and dopamine (DOPA) have been prepared and layer-by-layer (LbL) films of these modified nanofibrils have been built up in combination with a branched polyelectrolyte, polyethyleneimine (PEI), to obtain robust, adhesive, and wet-stable nanocoatings on solid surfaces. It is shown that the chemical functionalization of CNFCs with DOPA molecules alters their conventional properties both in liquid dispersion and at the interface and also influences the LbL. film formation by reducing the electrostatic interaction. Although the CNFC-DOPA conjugates show a lower colloidal stability in aqueous dispersions due to charge suppression, it was possible to prepare the LbL films through the consecutive deposition of the building blocks. Adhesive forces between muttilayer films prepared using chemically functionalized CNFCs and a silica probe are much stronger in the presence of Fe3+ than those between a multilayer film prepared from unmodified nanofibrils and a silica probe. The present work demonstrates a facile way to prepare chemically functionalized cellulose nanofibrils whereby more extended applications can produce novel cellulose-based materials with different functionalities.