Es Sayed Julien, Meyer Christophe, Sanson Nicolas, Perrin Patrick
Soft Matter Sciences and Engineering, ESPCI, PSL University, Sorbonne Université, CNRS, 10 rue Vauquelin, 75231 Cedex 05 Paris, France.
Molecular, Macromolecular Chemistry and Materials, ESPCI, PSL University, CNRS, 10 rue Vauquelin, 75231 Cedex 05 Paris, France.
ACS Macro Lett. 2020 Jul 21;9(7):1040-1045. doi: 10.1021/acsmacrolett.0c00389. Epub 2020 Jul 6.
An original route to develop an advanced class of microgel emulsifiers containing stimulable metallo-supramolecular instead of frozen covalent cross-links is reported. The poly(-isopropylmethacrylamide) (PNiPMAM) chains of the microgel are connected by iron(II)-bis(terpyridine) coordination supramolecular complexes that can be cleaved on demand, leading to unique properties both at interfaces and in volume. The microgel synthesis is not demanding, and the characterization of its supramolecular structure can be precisely achieved by standard methods. Singularly, interfaces of an oil-in-water emulsion stabilized by the supramolecular particles can be triggered at the molecular scale by oxidation of Fe(II) to Fe(III), leading to emulsion breaking. In bulk, we show that a microgel dispersion can indeed be transformed into a polymer solution upon oxidation. Our study paves the way to the discovery of unusual microgel properties as our proof-of-concept can be extended to different supramolecular chemistry and architecture.
报道了一种开发高级微凝胶乳化剂的新途径，该乳化剂含有可刺激的金属超分子而非固定的共价交联键。微凝胶的聚（甲基丙烯酸异丙酯）（PNiPMAM）链通过铁（II）-双（三联吡啶）配位超分子复合物连接，该复合物可按需裂解，从而在界面和本体中产生独特的性质。微凝胶的合成要求不高，其超分子结构的表征可通过标准方法精确实现。特别地，由超分子颗粒稳定的水包油乳液的界面可通过将Fe（II）氧化为Fe（III）在分子尺度上引发，导致乳液破乳。在本体中，我们表明微凝胶分散体在氧化后确实可以转变为聚合物溶液。我们的研究为发现异常的微凝胶性质铺平了道路，因为我们的概念验证可以扩展到不同的超分子化学和结构。
