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Updated: Jul 8, 2025
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
Published on: September 5, 2017
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在大型等离子纳米粒子中热载体放松的原子理论
Simão M João1, Hanwen Jin1, Johannes C Lischner1
1Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
The journal of physical chemistry. C, Nanomaterials and interfaces
|December 13, 2023
概括
这项研究引入了一种原子学方法,用于预测金属纳米粒子中的热载体种群. 结果显示,载体数量和电子温度取决于材料和尺寸,这对于设计先进的热载体设备至关重要.
科学领域:
- 塑制剂是一种塑制剂.
- 材料科学 材料科学 材料科学
- 计算物理 计算物理
背景情况:
- 在金属纳米粒子中的局部表面等离子会产生热载体.
- 热载体对光催化,光伏和传感应用具有兴趣.
- 预测热载体行为对于设备优化至关重要.
研究的目的:
- 开发一种原子学方法来预测热载体种群.
- 研究材料和纳米粒子大小对热载体的影响.
- 在照明下分析电子温度变化.
主要方法:
- 解决密度矩阵的运动方程.
- 考虑热载体激发和放松的情况.
- 对大型球形金 (Au) 和银 (Ag) 纳米粒子进行模拟.
主要成果:
- 热载体种群取决于材料 (Au与Ag) 和纳米粒子大小.
- 银纳米粒子显示出比金纳米粒子显著更高的电子温度增加.
- 在不同的放松模型中,热载体种群的定性特征是强大的.
结论:
- 开发的原子学方法准确地预测金属纳米粒子中的热载体动力学.
- 材料选择和尺寸是调整热载体特性的关键参数.
- 获得的洞察力可以指导设计更高效的基于热载体的设备.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
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01:28Atomic Nuclei: Types of Nuclear Relaxation
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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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