Nonequilibrum phase transition in the light-actuated self-assembly of nanoparticles: effects of surfaces and stochastic forces
Nonequilibrum phase transition in the light-actuated self-assembly of nanoparticles: effects of surfaces and stochastic forces
复制标题
DOI：
10.1117/12.2528987
复制
发表时间：
2019-09
期刊：
影响因子：
--
通讯作者：
H. Ji;R. Collison;Daniel Thomas;L. Vuong
中科院分区：
文献类型：
--
作者：
H. Ji;R. Collison;Daniel Thomas;L. Vuong
当我们在铟锡氧化物（ITO）涂层基板上照射金纳米流体时，纳米颗粒链通过光学结合力自组装。我们推测，金和ITO引脚纳米粒子的基板之间的电荷转移，并减少了横向布朗运动，因为它们附着在基板上。相应地，我们的自组装模型与额外的随机或随机力。模拟显示了非平衡相变：当随机力小时，纳米颗粒链垂直于光偏振方向排列，纳米颗粒在浅但稳定的节点处沉降;然而，当随机力大时，纳米颗粒链平行于光偏振方向排列，纳米颗粒在光学结合力基本为零的鞍点处沉降。由于布朗力的存在和强度影响形成的状态，我们重新考虑的作用，表面不仅在有关的电荷转移，但也传热。
When we illuminate gold nanofluids over indium-tin-oxide (ITO)-coated substrates, nanoparticle chains selfassemble via optical binding forces. We speculate that charge transfer between gold and ITO pins nanoparticles to the substrate and reduces the lateral Brownian motion as they attach to the substrate. We correspondingly model the self-assembly with additional stochastic or random forces. Simulations show a nonequilibrium-phase transition: when the stochastic force is small, nanoparticle chains align perpendicular to the light polarization and nanoparticles settle at shallow but stable nodes; when the stochastic force is large, however, the nanoparticle chains align parallel to the light polarization and nanoparticles settle at saddlepoints where the optical binding force is largely zero. Since the presence and strength of Brownian forces influence which state is formed, we reconsider the role that surfaces have—not only in relation to charge transfer but also heat transfer.