利用光开关活性掺杂实现胶体凝胶的重构、中断老化与增强动力学
Reconfiguration, Interrupted Aging and Enhanced Dynamics of a Colloidal Gel using Photo-Switchable Active Doping
AI总结：
本文研究光激活Janus粒子掺杂的准二维胶体凝胶，发现光激活可引发大尺度重组和持续短尺度位移，且活性关闭后凝胶保留结构记忆并具有比激活前更大的运动性，实现了凝胶的持久动力学增强。
摘要：
我们研究了由胶体网络掺杂Janus粒子构成的光激活准二维凝胶。在凝胶形成之后，我们在光激活之前、期间和之后监测凝胶的内部动力学。我们同时监测光照期之前、期间和之后的结构与动力学。被动粒子的迁移率表现出一种特征性的尺度依赖响应。在光激活后不久，凝胶表现出大尺度重组，随后在整个激活期间出现渐进式的短尺度位移。尽管结构变化较为细微（包括孔洞的打开与扩大以及链束的缩短），胶体网络仍保持连通，凝胶维持其结构完整性。一旦活性被关闭，凝胶仍保留从活性阶段继承下来的结构记忆。值得注意的是，其运动性仍大于活性阶段之前该凝胶的运动性。该系统已转变为一个真正不同的凝胶，其动力学被冻结，但为热涨落提供了更多空间。上述结论在活性阶段结束后很长时间内仍然成立。
英文摘要：
We study light-activated quasi-2d gels made of a colloidal network doped with Janus particles. Following the gel formation, the internal dynamics of the gel are monitored before, during, and after the light activation. We monitor both the structure and dynamics, before, during and after the illumination period. The mobility of the passive particles exhibits a characteristic scale-dependent response. Immediately following light activation, the gel displays large-scale reorganization, followed by progressive, short-scale displacements throughout the activation period. Albeit subtle structural changes (including pore opening and widening and shortening of strands) the colloidal network remains connected, and the gel maintains its structural integrity. Once activity is switched off, the gel keeps the memory of the structure inherited from the active phase. Remarkably, the motility remains larger than that of the gel, before the active period. The system has turned into a genuinely different gel, with frozen dynamics, but with more space for thermal fluctuations. The above conclusions remain valid long after the activity period.
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