非局部金属介电环境对物理和化学过程的影响
Carl E Bonner1, Mikhail Noginov2, Vanessa N Peters3
1Department of Chemistry and Center for Materials Research, Norfolk State University, 700 Park Avenue, Norfolk, Virginia 23504, United States.
Accounts of chemical research
|May 31, 2023
概括
等离子纳米层和金属/透电多层为遮蔽和超分辨率成像提供了先进的光学性能. 这些超材料表现出可调节的介电常数,并在表面湿和增强光化学反应中找到应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 光学是什么?光学是什么?光学是什么?
背景情况:
- 塑纳米层和金属/介电多层最初是为了光学隐蔽和亚衍射成像而开发的.
- 这些超材料具有可调节的介电常数,可以控制波传播.
- 最近的进展包括交替的黄金和化 (MgF) 层的薄层沉积.
研究的目的:
- 引入塑纳米层和金属/电解压多层的制造工艺.
- 探索这些复合材料的应用,包括表面湿,光火和光化学反应.
- 讨论由电场增强和高压物质接口产生的独特光学特性.
主要方法:
- 银 (Ag) 纳米棒的电化学沉积到化基质矩阵中.
- 连续的薄层沉积交替的金属 (例如,黄金) 和介电 (例如,MgF) 层.
- 材料特性和性能在各种应用中的表征.
主要成果:
- 制造材料在薄膜平面内或垂直于生长方向呈现异型负折射率.
- 金属/电介质复合材料允许控制电介质常数和平衡的真实/虚构元件,最大限度地减少波衰减.
- 在应用中观察到的效应包括光发射寿命的减少,增强的光化学反应速率和改变的表面能量.
结论:
- 等离子纳米层和金属/透电多层是具有可调光学性能的多功能超材料.
- 由于电场增强和独特的接口相互作用,这些材料在各种应用中显示出巨大的潜力.
- 突出了未来的研究方向和机会,特别是在HBCU中.
更多相关视频
10:05Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media
Published on: November 3, 2018
18.0K
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.0K
相关概念视频
01:27Electrostatic Boundary Conditions in Dielectrics
1.3K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.3K
01:17Theory of Metallic Conduction
1.4K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.4K
01:31Dielectric Polarization in a Capacitor
4.8K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.8K
02:58Crystal Field Theory - Octahedral Complexes
26.9K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.9K
01:28Magnetostatic Boundary Conditions
1.0K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.0K
02:32Bonding in Metals
47.5K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
47.5K