Zhang Xinyue, Peng Chifang, Jiang Jianzhong
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China.
School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China.
Small. 2024 Aug;20(35):e2401651. doi: 10.1002/smll.202401651. Epub 2024 Apr 25.
A pH and redox dual responsive amphiphilic viologen is synthesized, which can be reversibly transformed among the zwitterionic (SVa), monovalent anionic (SV), and divalent anionic (SVH) forms upon pH variation, exhibiting pH-controllable redox responsive properties. Switchable Pickering emulsions with different droplet size and viscosity are prepared by the mixture of hydrophilic silica nanoparticles and the viologens (SV or SVH) at acidic conditions, while such combination yielded an oil-in-dispersion emulsion at neutral pH value. Not only can rapid reversible demulsification/stabilization of the Pickering emulsions be achieved by redox reactions, but the rate of redox-demulsification can also be controlled by pH trigger. The dual-responsive amphiphilic viologens have potential applications in developing intelligent colloid materials and molecular logic systems.
合成了一种pH和氧化还原双响应两亲性紫精，其在pH变化时可在两性离子（SVa）、单价阴离子（SV）和二价阴离子（SVH）形式之间可逆转变，表现出pH可控的氧化还原响应特性。在酸性条件下，通过亲水性二氧化硅纳米颗粒与紫精（SV或SVH）的混合物制备了具有不同液滴尺寸和粘度的可切换Pickering乳液，而在中性pH值下这种组合产生了分散油乳液。不仅可以通过氧化还原反应实现Pickering乳液的快速可逆破乳/稳定，而且氧化还原破乳速率还可以由pH触发来控制。这种双响应两亲性紫精在开发智能胶体材料和分子逻辑系统方面具有潜在应用。
