A Dual pH- and Light-Responsive Spiropyran-Based Surfactant: Investigations on Its Switching Behavior and Remote Control over Emulsion Stability.
A Dual pH- and Light-Responsive Spiropyran-Based Surfactant: Investigations on Its Switching Behavior and Remote Control over Emulsion Stability.
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DOI：
10.1002/anie.202114687
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发表时间：
2022-05-16
影响因子：
16.6
通讯作者：
Boeker, Alexander
中科院分区：
文献类型：
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作者：
Reifarth, Martin;Bekir, Marek;Bapolisi, Alain M.;Titov, Evgenii;Nusshardt, Fabian;Nowaczyk, Julius;Grigoriev, Dmitry;Sharma, Anjali;Saalfrank, Peter;Santer, Svetlana;Hartlieb, Matthias;Boeker, Alexander
关键词：
制备了一种含有螺吡喃单元的阳离子表面活性剂，其表面活性特征表现出双重响应可调节性。该系统的转换机制依赖于非离子螺吡喃（SP）向两性离子汞（MC）的可逆转化，并且可以通过调节pH值和通过光进行控制，从而产生pH依赖性光活性：虽然该化合物在酸性条件下两种形式之间的表面活性存在显著差异，但这种行为在中性pH水平下受到抑制。基本的开关过程进行了详细研究，并提供了理论和实验结果相结合的基础上的热力学解释。这种复杂的刺激响应行为使远程控制胶体系统成为可能。为了证明其适用性，将表面活性剂用于水包油乳液的pH依赖性操作。提出了一种基于螺吡喃的阳离子表面活性剂。其结构使分子具有双重响应性，从而具有意想不到的转换行为：虽然光刺激会影响化合物在酸化条件下的表面活性行为，但在pH值>6.5时未观察到明显的光响应性。通过操纵水包油乳剂的完整性证明了该效应。
A cationic surfactant containing a spiropyran unit is prepared exhibiting a dual‐responsive adjustability of its surface‐active characteristics. The switching mechanism of the system relies on the reversible conversion of the non‐ionic spiropyran (SP) to a zwitterionic merocyanine (MC) and can be controlled by adjusting the pH value and via light, resulting in a pH‐dependent photoactivity: While the compound possesses a pronounced difference in surface activity between both forms under acidic conditions, this behavior is suppressed at a neutral pH level. The underlying switching processes are investigated in detail, and a thermodynamic explanation based on a combination of theoretical and experimental results is provided. This complex stimuli‐responsive behavior enables remote‐control of colloidal systems. To demonstrate its applicability, the surfactant is utilized for the pH‐dependent manipulation of oil‐in‐water emulsions. A spiropyran‐based cationic surfactant is presented. Its architecture renders the molecule dual‐responsive, possessing thereby an unexpected switching behaviour: While photo‐stimulation influences the surface‐active behaviour of the compound under acidified conditions, no notable photo‐responsiveness is observed at pH‐values >6.5. This effect is demonstrated by manipulating the integrity of an oil‐in‐water emulsion.
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影响因子：
4.6
作者：
Bhattacharyya, Soumalya;Maity, Manoranjan;Chowdhury, Aniket;Saha, Manik Lal;Panja, Sumit Kumar;Stang, Peter J.;Mukherjee, Partha Sarathi
通讯作者：
Mukherjee, Partha Sarathi
由螺吡喃改性蒙脱土纳米片堆叠而成的层状光致变色薄膜
影响因子：
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影响因子：
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作者：
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通讯作者：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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