ELECTRIC ALIGNMENT OF LIQUID CRYSTALLINE BINARY COLLOIDS OF MICROMETER-SIZED NIOBATE AND CLAY NANOSHEETS
ELECTRIC ALIGNMENT OF LIQUID CRYSTALLINE BINARY COLLOIDS OF MICROMETER-SIZED NIOBATE AND CLAY NANOSHEETS
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微米级铌酸盐和粘土纳米片液晶二元胶体的电取向
DOI：
10.11362/jcssjclayscience.ms-21-13
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Emiko Mouri
中科院分区：
文献类型：
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作者：
Teruyuki Nakato;Wataru Ishitobi;Emiko Mouri
在无机层状晶体剥离法制备的无机纳米片胶体体系中，两种不同纳米片的二元胶体因其多组分、多相共存而具有重要意义，适用于新材料的制备。然而，虽然单组分纳米片胶体的电响应最近被研究，但二元纳米片胶体的电响应却很少受到关注。我们在此报告的电排列的水性二元纳米片胶体的铌酸钾K4Nb6O17和合成的氟锂蒙脱石，这两者都有几个微米的大的横向尺寸。在二元胶体中，纳米片响应于所施加的AC电压而平行于电场排列。虽然粘土纳米片在其单组分胶体中也响应于AC电场，但它们的排列在二元胶体中基本上被抑制。然而，结合光学显微镜观察的明场，偏振，和荧光检测表明，大的粘土血小板部分参与的排列运动的纳米片。结果，一些粘土片晶平行于电场排列。胶体液晶性的粘土纳米片有助于通过将后者的颗粒的液晶域的前一个的粘土颗粒的排列。
Among colloidal systems of inorganic nanosheets prepared by exfoliation of inorganic layered crystals, binary colloids of two different nanosheet species are important for their multicomponent and multiphase coexistence, which is applicable to new materials. Nevertheless, electric response of binary nanosheet colloids has scarcely been paid attention although that of single-component nanosheet colloids has recently been investigated. We report herein the electric alignment of aqueous binary nanosheet colloids of niobate K4Nb6O17 and synthetic fluorohectorite, both of which have large lateral sizes of a few micrometers. In the binary colloids, the niobate nanosheets respond to an applied AC electric voltage to be aligned in parallel to the electric field. Although the clay nanosheets also respond to an AC electric field in their single-component colloids, their alignment is basically suppressed in the binary colloids. However, combined optical microscope observations of bright-field, polarized, and fluorescence detections indicate that large clay platelets are partly involved in the aligning motion of the niobate nanosheets. As a result, some of the clay platelets are aligned in parallel to the electric field. Colloidal liquid crystallinity of the niobate nanosheets contribute to the alignment of the clay particles by incorporating the latter particles to the liquid crystalline domains of the former ones.