Liquid crystals of aqueous, giant graphene oxide flakes

被引：169

作者：

Dan, Budhadipta ^{[2
,4
]}

Behabtu, Natnael ^{[1
]}

Martinez, Angel ^{[4
]}

Evans, Julian S. ^{[4
]}

Kosynkin, Dmitry V. ^{[3
]}

Tour, James M. ^{[3
]}

Pasquali, Matteo ^{[1
,3
]}

Smalyukh, Ivan I. ^{[4
,5
,6
,7
,8
]}

机构：

[1] Dept Chem & Biomol Engn, Houston, TX 77005 USA

[2] Dept Phys & Astron, Houston, TX 77005 USA

[3] Rice Univ, Dept Chem, RE Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA

[4] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[5] Univ Colorado, Mat Sci & Engn Grad Program, Boulder, CO 80309 USA

[6] Univ Colorado, Liquid Crystal Mat Res Ctr, Boulder, CO 80309 USA

[7] Univ Colorado, Renewable & Sustainable Energy Inst, Boulder, CO 80309 USA

[8] Natl Renewable Energy Lab, Boulder, CO 80309 USA

来源：

SOFT MATTER | 2011年 / 7卷 / 23期

基金：

美国国家科学基金会;

关键词：

ELASTIC-CONSTANTS; COLLOIDAL INTERACTIONS; ANISOTROPIC FLUIDS; PHASE-TRANSITIONS; SUSPENSIONS; HARD; DISPERSIONS; PARTICLES; SEPARATION; ALIGNMENT;

D O I：

10.1039/c1sm06418e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the observation of liquid crystals formed by giant graphene oxide flakes (aspect ratio above 10 000) suspended in water. As their concentration increases, the flakes undergo transitions from an isotropic dispersion to a biphasic system and then to a discotic nematic liquid crystal. The gel-like liquid crystal displays an unusual defect-free uniform director alignment over hundreds of micrometres. We characterize the nematic order parameter, optical birefringence and elastic properties of this novel mesomorphic system.

引用

页码：11154 / 11159

页数：6

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