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首页> 外文期刊>RSC Advances >Supramolecular self-assembly and physical-gel formation in disc-like liquid crystals: a scalable predictive model for gelation and an application in photovoltaics
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Supramolecular self-assembly and physical-gel formation in disc-like liquid crystals: a scalable predictive model for gelation and an application in photovoltaics

机译：盘状液晶中的超分子自组装和物理凝胶形成：凝胶化的可扩展预测模型及其在光伏中的应用

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The application of triphenylene-based discotic liquid crystal derivatives as physical gelators is investigated. In particular, we focus on 2,3,6,7,10,11-hexakis-pentyloxytriphenylene (HAT5) and the longer alkyl chain homologue (HAT6). The driving mechanisms behind and parameter space of non-covalent physical gel formation is studied. A Hansen solubility parameter (HSP) approach is used to predict physical gelation of these disc-like liquid crystalline molecules in a variety of common organic and inorganic solvents important to electrochemical devices. Our results show that HSP analysis is very useful for the prediction of gel formation. The results are transferrable and can form the basis for future investigations into liquid crystalline physical gels. Furthermore, we use acetonitrile as a solvent and apply the gels as electrolytes in dye sensitized solar cells. It is observed that using a binary mixture of gelators results in average photovoltaic power conversion efficiencies as high as 7.21%, compared to a 5.9% reference electrolyte. This is attributed to a reduction in electron recombination at the n-type interface and provides further insight about hybrid gelators. Coupled with an increase in device stability, the results are promising for gel-based dye sensitized solar cells as well as potentially other electrolytic devices such as batteries and supercapacitors.
机译：研究了基于三亚苯基的盘状液晶衍生物作为物理胶凝剂的应用。特别是，我们专注于2,3,6,7,10,11-六烷基戊氧基三亚苯基（HAT5）和更长的烷基链同系物（HAT6）。研究了非共价物理凝胶形成的驱动机制和参数空间。汉森溶解度参数（HSP）方法用于预测这些盘状液晶分子在对电化学装置重要的各种常见有机和无机溶剂中的物理胶凝。我们的结果表明，HSP分析对于预测凝胶形成非常有用。结果是可转移的，并可为将来对液晶物理凝胶的研究奠定基础。此外，我们使用乙腈作为溶剂，并在染料敏化太阳能电池中将凝胶用作电解质。观察到，使用胶凝剂的二元混合物，与5.9％的参比电解液相比，平均光伏发电转换效率高达7.21％。这归因于在n型界面处电子重组的减少，并提供了关于混合胶凝剂的进一步见解。加上器件稳定性的提高，该结果有望用于基于凝胶的染料敏化太阳能电池以及潜在的其他电解器件，例如电池和超级电容器。

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