WIDE ANALYSIS OF LOW-ENERGY PLASMONICALLY-POWERED CASCADED DYNAMICS IN LIQUIDS

非技术描述：表面等离子体是金属和绝缘体之间界面上电子的集体振荡。在物理、生物医学和环境科学中，金属纳米材料通过等离子体效应吸收和集中光是众所周知的。来自表面等离子体的能量已被证明可以为各种新的化学、热、电和机械现象提供动力。这个项目解决了最近观察到的等离子体相互作用在液体分散的金属纳米粒子上施加弱磁场。这项研究的结果解释了等离子体的能量是如何转移到周围环境的，因此与深刻的环境、生物和生理效应有关。跨学科和数据密集型的研究活动为未来的科学专业人员提供了全面的技术培训。现正积极从事纽约市公立高中学院教学工作！计划，指导那些成功晋级英特尔国际科学与工程博览会的高中生，并在香港组织一个新的以讨论为中心的研究会议，目的是加速和传播等离子体能量转移的知识。技术描述：该项目的重点是了解等离子体吸收纳米流体中较长时间的光诱导变化，特别是那些由低强度光和静态磁场同时照射引起的变化。研究了纳米颗粒周围蒸汽的形成，并对蒸汽包裹的纳米颗粒的动力学进行了成像，从而实现了多相流体动力学的转换分析模型。近场和远场行为的耦合研究对于设计未来的光学探针和解释纳米流体的光学响应至关重要。首席研究员还通过分析被液体包围的等离子体二维基板的近场行为，描述了大块纳米流体的新型热泳、热电和电动行为。广泛的分析和方法可以确定与等离子体相关的难以捉摸和异常行为，以解释在等离子体表面上观察到的溶解气体在液体中的临界成核，这是目前尚不清楚的。

Nontechnical description: Surface plasmons are collective oscillations of electrons at the interface between a metal and an insulator. In the physical, biomedical, and environmental sciences, metal nanomaterials are well-known to absorb and concentrate light through plasmonic effects. The energy from surface plasmons has been shown to power a variety of novel chemical, thermal, electrical and mechanical phenomena. This project addresses recent observations of plasmonic interactions in liquid-dispersed metal nanoparticles onto which weak magnetic fields are applied. Results from this study explain how the energy of plasmons is transferred to their surrounding environment, and thus relate to profound environmental, biological, and physiological effects. Interdisciplinary and data-intensive research activities provide versatile technical training for future science professionals. The principal investigator is also actively engaged in teaching in New York City public high school College Now! programs, mentoring high school students who have successfully advanced to the Intel International Science and Engineering Fair, and organizing a new discussion-centered Research Conference in Hong Kong, with the aim of accelerating and disseminating knowledge of plasmon energy transfer.Technical description: The project is centered on understanding the longer-lived light-induced changes in plasmonically-absorbing nanofluids, particularly those that result from the simultaneous illumination of low-intensity light and static magnetic fields. The formation of vapor around nanoparticles is studied, and the dynamics of the vapor-encased nanoparticles are imaged, enabling transformative analytical models of the multi-phase hydrodynamics. The dovetailed study of the near-field and far-field behaviors is essential for designing future optical probes and interpreting the optical response of nanofluids. The principal investigator also characterizes the novel thermophoretic, thermoelectric, and electrokinetic behavior of bulk nanofluids by analyzing the near-field behavior of plasmonic 2D substrates surrounded by liquids. The wide analysis and approach may pinpoint elusive and anomalous behaviors associated with plasmons to explain the observed critical nucleation of dissolved gasses in liquids on plasmonic surfaces, which is currently not understood.