Engineering new layered solids from exfoliated inorganics: a periodically alternating hydrotalcite-montmorillonite layered hybrid.
Engineering new layered solids from exfoliated inorganics: a periodically alternating hydrotalcite-montmorillonite layered hybrid.
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DOI：
10.1038/srep03498
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发表时间：
2013-12-16
影响因子：
4.6
通讯作者：
Vasudevan, Sukumaran
中科院分区：
文献类型：
--
作者：
Chalasani, Rajesh;Gupta, Amit;Vasudevan, Sukumaran
通过剥离无机层状晶体得到的二维(2D)纳米片是一类具有独特属性的新型材料。关键的挑战之一是开发健壮和通用的方法，从这些2D纳米薄片创建新的纳米结构。在这里，我们报告了属于两种不同类别的层状材料-阳离子粘土蒙脱石和阴离子粘土水滑石-的分层，方法是插入适当的离子表面活性剂，然后在非极性溶剂中分散。固体被剥离成原子厚度的单层，而离子表面活性剂仍然与无机表面活性剂相连，因此纳米片是电中性的。然后，我们证明了当两种固体的分散相混合时，剥离的片层自组装成具有周期性交替的水滑石和蒙脱石层的新的层状固体。这里概述的程序很容易扩展到其他层状固体，通过自组装从2D纳米片创建新的超结构。
Two-dimensional (2D) nanosheets obtained by exfoliating inorganic layered crystals have emerged as a new class of materials with unique attributes. One of the critical challenges is to develop robust and versatile methods for creating new nanostructures from these 2D-nanosheets. Here we report the delamination of layered materials that belonging to two different classes - the cationic clay, montmorillonite, and the anionic clay, hydrotalcite - by intercalation of appropriate ionic surfactants followed by dispersion in a non-polar solvent. The solids are delaminated to single layers of atomic thickness with the ionic surfactants remaining tethered to the inorganic and consequently the nanosheets are electrically neutral. We then show that when dispersions of the two solids are mixed the exfoliated sheets self-assemble as a new layered solid with periodically alternating hydrotalcite and montmorillonite layers. The procedure outlined here is easily extended to other layered solids for creating new superstructures from 2D-nanosheets by self-assembly.
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