天然粘土纳米片水悬浮液的液晶性质

IF 4.8 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
E. Paineau, A. Philippe, K. Antonova, I. Bihannic, P. Davidson, I. Dozov, J. Gabriel, M. Impéror-Clerc, P. Levitz, F. Meneau, L. Michot
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引用次数: 46

摘要

粘土矿物,如贝德尔石或非膨润土,在水中会自发脱落,形成纳米片的胶体悬浮液。在一定的浓度范围内,这些悬浮液表现为向列液晶相,其结构和性质可以通过偏振光显微镜和小角度x射线散射(SAXS)方便地进行详细研究。此外,剪切粘土悬浮物的原位SAXS研究提供了有关其各向同性和向列相流动特性的信息。胶体向列相表现出通常向列相的经典性质,如表面锚定和电场和磁场排列。因此,可以产生向列单域。各向同性相在中等电场中也表现出强烈的电光效应。最后,我们描述了这些系统的几个应用实例,并展示了这些研究如何扩展到其他类型的纳米片悬浮液。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Liquid–crystalline properties of aqueous suspensions of natural clay nanosheets
Clay minerals, like beidellite or nontronite, spontaneously exfoliate in water and form colloidal suspensions of nanosheets. In a given range of concentration, these suspensions display a nematic liquid–crystalline phase whose structure and properties can be conveniently studied in detail by polarized-light microscopy and small-angle X-ray scattering (SAXS). Moreover, in situ SAXS investigations of sheared clay suspensions provide information about their flow properties, both in the isotropic and nematic phases. The colloidal nematic phase shows the classical properties of usual nematics, such as surface anchoring and electric-field and magnetic-field alignment. Thus, nematic single domains can be produced. The isotropic phase also displays strong electro-optic effects in moderate electric fields. Finally, we describe a few examples of applications of such systems and we show how these studies could be extended to suspensions of other types of nanosheets.
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来源期刊
Liquid Crystals Reviews
Liquid Crystals Reviews CHEMISTRY, PHYSICALCRYSTALLOGRAPHY&n-CRYSTALLOGRAPHY
CiteScore
7.60
自引率
5.90%
发文量
8
期刊介绍: Liquid Crystals Reviews publishes review articles on all aspects of liquid crystal fundamentals and applied science, including experimental and theoretical studies of physical and chemical properties, molecular design and synthesis and engineering of liquid crystal devices. The Journal fosters cross-disciplinary exchange of ideas, encouraging authors to present material at a level accessible to specialists from other fields of science and engineering. Liquid Crystals Reviews provides the scientific community, in both academia and industry, with a publication of standing, guaranteed by the Editors and by the International Editorial Board who are active scientists in the worldwide liquid crystal community.
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