PDF(Pubmed)
Abstract：
Periodic responses to nonperiodic energy inputs, such as oscillations, are hallmarks of living systems. Nanoparticle-based systems have largely remained unexplored in the generation of oscillatory features. Here, we demonstrate a nanosystem featuring hierarchical response to light, where thermoplasmonic effects and reversible DNA-hybridization generate thermal convective forces and ultimately, oscillatory hydrodynamic flows. The slow aggregation of gold nanoparticles (AuNPs) serves as a positive feedback, while fast photothermal disassembly acts as negative feedback. These asymmetric feedback loops, combined with thermal hysteresis for time-delay, are essential ingredients for orchestrating an oscillating response.
摘要：
对非周期性能量输入的周期性响应，比如振荡，是生命系统的标志。基于纳米颗粒的系统在振荡特征的产生中很大程度上仍未被探索。这里,我们展示了一个具有对光的分层响应的纳米系统，其中热等离子体效应和可逆DNA杂交产生热对流力，最终，振荡流体动力流。金纳米粒子（AuNPs）的缓慢聚集作为正反馈，而快速光热拆卸作为负反馈。这些非对称反馈回路，结合时间延迟的热滞后，是协调振荡反应的基本要素。
