在低维混合导体中解离离子和电子路径
Yubing Zhou1, Chaoji Chen1, Xin Zhang1
1Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742 , United States.
Journal of the American Chemical Society
|October 25, 2019
概括
我们开发了一种基于石墨的纳米流体材料, 这种结构实现了高离子导电性,同时保持了超低的电导电性,非常适合新的纳米流体设备.
科学领域:
- 材料科学
- 纳米技术
- 电化学
背景情况:
- 由于易于制造和可调性特性,二维 (2D) 层化合物越来越多地用于纳米流体离子传输.
- 开发具有高离子流和选择性的材料对于先进的纳米流体设备至关重要.
研究的目的:
- 设计和制造以纳米模拟石墨为基础的纳米流体结构,以实现有效的离子传输.
- 在二维层材料系统中研究离子和电导率的解.
- 探索这种混合材料在新型纳米流体设备应用中的潜力.
主要方法:
- 使用纳米纤维化纤维素 (NFC) 包裹的石墨片制造二维纳米流体结构.
- 通过调整石墨-NFC复合物的水合度来表征离子和电导率.
- 在酸性和性环境中评估材料的稳定性.
主要成果:
- 石墨-NFC结构在有限的纳米通道 (∼1 nm) 中展示了快速的阴离体传输.
- 通过调节水合,实现了离子导电的显著增强 (近12倍),达到1 × 10−3 S/cm.
- 即使在高度的石墨 (高达50%重量) 中,也表现出极低的电导率 (≤10-9S/cm).
- 这种材料在酸性和性条件下表现出极好的稳定性.
结论:
- 纳米模拟石墨-NFC混合系统为研究纳米流体离子传输提供了一个有前途的平台.
- 这种策略有效地解离离子和电子通路,为设备应用提供独特的特性.
- 开发的材料具有高离子导电性和低电导电性,适用于先进的纳米流体设备.
相关概念视频
Band Theory
16.9K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
16.9K
Semiconductors
1.3K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.3K
Charging Conductors By Induction
8.9K
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
8.9K
Theory of Metallic Conduction
1.7K
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,...
1.7K
Electric Field Inside a Conductor
7.1K
When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
7.1K
Ionic Bonding and Electron Transfer
48.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
48.4K


