氧化石墨烯液晶相结构的调控及应用进展

Phase structure control and applications of graphene oxide liquid crystals

氧化石墨烯液晶(GOLCs)是氧化石墨烯薄片分散在水或极性有机溶剂中形成的宏观介晶有序、微观各向异性的液晶相,在自组装膜、储能、液晶显示器和超强纤维等领域展现良好的应用前景。本文首先介绍了氧化石墨烯液晶具有向列相、层状相和手性相等结构特征;具体综述了氧化石墨烯液晶相变的影响因素、调控途径及其原理,包括氧化石墨烯的尺寸及其分布、氧化石墨烯的氧化程度、氧化石墨烯在溶液中的质量/体积分数、溶剂的极性、溶液的pH以及添加盐的种类、浓度,外界施加的电场或磁场;最后简单介绍了氧化石墨烯液晶在电化学及其他方面的潜在应用。本文为调控氧化石墨烯液晶的相结构、开发多功能氧化石墨烯液晶及拓宽氧化石墨烯液晶的应用领域提供了理论指导。

Graphene oxide liquid crystals (GOLCs) are macroscopic ordered mesocrystalline and miscroscopic anisotropic liquid crystals phase, which can be formed by graphene oxide sheets dispersed in water or polar organic solvents, and hold promise in self-assembled film, energy storage, liquid crystals display and super fibers. Firstly, the phase structure characteristics of graphene oxide liquid crystals with nematic phase, lamellar phase and chirality phase are introduced. The influencing factors, regulation ways and principles of the graphene oxide liquid crystals phase change are reviewed in detail, including the size and size distribution of graphene oxide, oxidation degree of graphene oxide, mass/volume fraction, salt concentration, pH of solution, solvent polarity and externally applied electric or magnetic fields. Finally, the potential applications of graphene oxide liquid crystals in electrochemistry and other applications are introduced. This review may provide theoretical guidance for controlling the phase structure of graphene oxide liquid crystals, developing multifunctional graphene oxide liquid crystals and widening the applications of graphene oxide liquid crystals.