Controlling nanochannel orientation and dimensions in graphene-based nanofluidic membranes.
Controlling nanochannel orientation and dimensions in graphene-based nanofluidic membranes.
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DOI：
10.1038/s41467-020-20837-2
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发表时间：
2021-01-21
影响因子：
16.6
通讯作者：
Hurt RH
中科院分区：
文献类型：
--
作者：
Liu M;Weston PJ;Hurt RH
人们对利用层状材料中的范德华间隙作为纳米流体通道非常感兴趣。众所周知，氧化石墨烯（GO）纳米片可以自发组装成堆叠的平面膜，其传输特性对分子结构具有高度选择性。传统 GO 膜在液相应用中的使用通常受到低通量值的限制，因为片间纳米通道排列垂直于所需的 Z 方向传输，这导致比膜厚度长几个数量级的迂回流体路径。在这里，我们演示了一种利用 Zr 掺杂 GO 薄膜的压缩不稳定性来创建皱纹图案的方法，该图案可将纳米片旋转到大角度。在聚合物基质中捕获这种结构并进行薄片切片可产生具有近垂直排列的纳米通道阵列的完全致密的膜。这些强大的纳米流体装置显着缩短了流体路径长度，同时保留了 GO 层间纳米通道对水相对于非极性分子的高选择性。垂直堆叠的氧化石墨烯片是用于分子筛分技术的有前景的结构。通过以类似手风琴的方式折叠大的平面纸张，刘等人。制造一种薄而坚固的过滤器，具有接近垂直排列的纳米通道，适合商业分离膜。
There is great interest in exploiting van der Waals gaps in layered materials as nanofluidic channels. Graphene oxide (GO) nanosheets are known to spontaneously assemble into stacked planar membranes with transport properties that are highly selective to molecular structure. Use of conventional GO membranes in liquid-phase applications is often limited by low flux values, due to intersheet nanochannel alignment perpendicular to the desired Z-directional transport, which leads to circuitous fluid pathways that are orders of magnitude longer than the membrane thickness. Here we demonstrate an approach that uses compressive instability in Zr-doped GO thin films to create wrinkle patterns that rotate nanosheets to high angles. Capturing this structure in polymer matrices and thin sectioning produce fully dense membranes with arrays of near-vertically aligned nanochannels. These robust nanofluidic devices offer pronounced reduction in fluid path-length, while retaining the high selectivity for water over non-polar molecules characteristic of GO interlayer nanochannels. Vertically stacked graphene oxide sheets are promising structures for molecular sieving technologies. By folding large planar sheets in an accordion-like manner, Liu et al. fabricate a thin robust filter with near-vertically aligned nanochannels geared towards commercial separation membranes.
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影响因子：
10.9
作者：
Lecaros, Rumwald Leo G.;Mendoza, Gregory Emmanuel J.;Lai, Juin-Yih
通讯作者：
Lai, Juin-Yih
可用于化学保护，检测和致动的超湿石墨烯分子屏障。
影响因子：
17.1
作者：
Chen PY;Zhang M;Liu M;Wong IY;Hurt RH
通讯作者：
Hurt RH
影响因子：
29.4
作者：
Erickson, Kris;Erni, Rolf;Zettl, Alex
通讯作者：
Zettl, Alex
影响因子：
3.3
作者：
Schniepp, HC;Li, JL;Aksay, IA
通讯作者：
Aksay, IA
影响因子：
29.4
作者：
Jiang, Lili;Yang, Tianzhong;Gao, Hong-Jun
通讯作者：
Gao, Hong-Jun