Dual-Responsive Viscoelastic Lyotropic Liquid Crystal Fluids to Control the Diffusion of Hydrophilic and Hydrophobic Molecules
Dual-Responsive Viscoelastic Lyotropic Liquid Crystal Fluids to Control the Diffusion of Hydrophilic and Hydrophobic Molecules
复制标题
双响应粘弹性溶致液晶流体控制亲水和疏水分子的扩散
DOI：
10.1002/cphc.201600066
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发表时间：
2016
期刊：
影响因子：
2.9
通讯作者：
Hao Jingcheng
中科院分区：
文献类型：
--
作者：
Wang Dong;Cao Yueying;Cao Meiwen;Sun Yawei;Wang Jiqian;Hao Jingcheng
制备了一种智能溶致液晶（LLC）系统，用于控制亲疏水分子的扩散速率。LLC体系由非离子表面活性剂（四乙二醇单十二烷基醚；C12EO4）和阴离子偶氮苯表面活性剂（偶氮表面活性剂）组成。c12eo4是LLC系统的主要组成部分。偶氮表面活性剂可以进行光异构化，在该体系中起触发作用。LLC凝胶在偶氮表面活性剂（10毫米）和C12EO4（300毫米）组成的溶液中形成。当添加更多的偶氮表面活性剂（例如，添加到15 mm）时，LLC凝胶会破裂，并且失去粘弹性。令人惊讶的是，当我们用紫外线照射300 mmC12EO4/15 mmAzo‐表面活性剂样品时，凝胶被回收，并且观察到高粘弹性。然而，在可见光照射下，凝胶再次破裂。凝胶的形成也可以通过加热样品来触发。在加热300 mmC12EO4/15 mmAzo -表面活性剂样品时，体系增稠到典型凝胶行为记录的点。当样品冷却时，凝胶再次破裂。LLC可以用于控制亲水和疏水分子的释放，并且可以被认为是在具有实际重要性的系统中递送活性物质的通用载体。
A smart lyotropic liquid crystal (LLC) system was prepared to control the diffusion rate of hydrophilic and hydrophobic molecules. The LLC system is composed of a nonionic surfactant (tetraethylene glycol monododecylether; C12EO4) and an anionic azobenzene surfactant (Azo‐surfactant). C12EO4was the main component of the LLC system. The Azo‐surfactant, which can undergo photo‐isomerization, played the role of trigger in this system. LLC gels formed in a solution comprised of Azo‐surfactant (10 mm) and C12EO4(300 mm). The LLC gels became broken when more Azo‐surfactant was added (e.g., up to 15 mm) and the viscoelasticity was lost. Surprisingly, when we used UV light to irradiate the 300 mmC12EO4/15 mmAzo‐surfactant sample, the gel was recovered and high viscoelasticity was observed. However, under visible‐light irradiation, the gel became broken again. The gel formation could also be triggered by heating the sample. On heating the 300 mmC12EO4/15 mmAzo‐surfactant sample, the system thickened to a point at which typical gel behavior was registered. When the sample was cooled, the gel broke again. The LLC could be used for controlled release of hydrophilic and hydrophobic molecules, and could be considered as a versatile vehicle for the delivery of actives in systems of practical importance.