Zhang Jianxin, Liu Jiahang, Wang Zihao, Hao Shuai, Song Hongzan
College of Chemistry & Environmental Science, Hebei University, Baoding, Hebei Province 071002, P. R. China.
Langmuir. 2020 Aug 25;36(33):9818-9826. doi: 10.1021/acs.langmuir.0c01381. Epub 2020 Aug 13.
Anisotropic nanoparticles and their dispersions have attracted much attention because of their distinguished characteristics and promising applications. In this study, the novel liquid crystalline nanocomposite ionogel electrolyte materials based on anisotropic nanoparticles of attapulgite (ATP) have been prepared. The gelation, liquid crystalline (LC) behavior, thermal stability, and ionic conductivity were systematically investigated. Rheological, polarized optical microscopy (POM), and small-angle X-ray scattering (SAXS) measurements demonstrated that these liquid crystalline ionogels showed a two-step mechanism consisting of gelation and subsequent reorganization of the gel. Interestingly, the obtained ionogel electrolytes were very stable and LC gel structures were not destroyed even though the temperature was as high as 200 °C. Furthermore, these ionogels possessed outstanding thermal stability and the decomposition temperature exceeded 400 °C. Remarkably, the LC nanocomposite ionogel electrolytes exhibited high room temperature ionic conductivity and the value still exceeded 1.0 × 10 S/cm even when the ATP concentration up to 30 wt %. These novel findings are very useful for the fabrication of high temperature resistant electrochemical devices and liquid crystalline nanocomposite materials.
各向异性纳米粒子及其分散体因其独特的特性和广阔的应用前景而备受关注。在本研究中，制备了基于凹凸棒石（ATP）各向异性纳米粒子的新型液晶纳米复合离子凝胶电解质材料。系统研究了其凝胶化、液晶（LC）行为、热稳定性和离子电导率。流变学、偏光显微镜（POM）和小角X射线散射（SAXS）测量表明，这些液晶离子凝胶呈现出由凝胶化和随后的凝胶重组组成的两步机制。有趣的是，所获得的离子凝胶电解质非常稳定，即使温度高达200°C，液晶凝胶结构也不会被破坏。此外，这些离子凝胶具有出色的热稳定性，分解温度超过400°C。值得注意的是，液晶纳米复合离子凝胶电解质表现出高室温离子电导率，即使ATP浓度高达30 wt%，该值仍超过1.0×10 S/cm。这些新发现对于制造耐高温电化学器件和液晶纳米复合材料非常有用。
