Rheological Characteristics of 2D Titanium Carbide (MXene) Dispersions: A Guide for Processing MXenes
Rheological Characteristics of 2D Titanium Carbide (MXene) Dispersions: A Guide for Processing MXenes
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DOI：
10.1021/acsnano.7b08889
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发表时间：
2018-03-01
期刊：
影响因子：
17.1
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Akuzum, Bilen;Maleski, Kathleen;Gogotsi, Yury
了解悬浮液中二维（2D）材料的流变特性对于开发各种溶液加工和制造技术至关重要。2D碳化物和氮化物（MXenes）是2D材料中最大的家族之一，具有超过20种合成成分，应用范围从储能到医学再到光电子。然而，尽管有关于粘土样行为的报道，但对其流变响应知之甚少。在这项研究中，单层和多层Ti3C2Tx在水分散体的流变行为进行了研究。在从胶体分散体到高负载浆料的各种浓度下研究了MXene分散体的粘性和粘弹性性质，表明具有高达70重量%的多层MXene悬浮液可以表现出流动性。MXene薄膜、涂层和纤维的制造工艺指南已根据流变特性制定。令人惊讶的是，对于单层MXene薄片的溶液，在非常低的浓度下观察到高粘度。发现单层胶体溶液即使在最低测试浓度下也表现出部分弹性（
Understanding the rheological properties of two-dimensional (2D) materials in suspension is critical for the development of various solution processing and manufacturing techniques. 2D carbides and nitrides (MXenes) constitute one of the largest families of 2D materials with >20 synthesized compositions and applications already ranging from energy storage to medicine to optoelectronics. However, in spite of a report on clay-like behavior, not much is known about their rheological response. In this study, rheological behavior of single- and multilayer Ti3C2Tx in aqueous dispersions was investigated. Viscous and viscoelastic properties of MXene dispersions were studied over a variety of concentrations from colloidal dispersions to high loading slurries, showing that a multilayer MXene suspension with up to 70 wt % can exhibit flowability. Processing guidelines for the fabrication of MXene films, coatings, and fibers have been established based on the rheological properties. Surprisingly, high viscosity was observed at very low concentrations for solutions of single-layer MXene flakes. Single-layer colloidal solutions were found to exhibit partial elasticity even at the lowest tested concentrations (