在短单极纳米孔中调节离子电流整顿
Hongwen Zhang1, Long Ma1, Di Liu2
1Key Laboratory of High Efficiency and Clean Mechanical Manufacture of the Ministry of Education, State Key Laboratory of Advanced Equipment and Technology for Metal Forming, School of Mechanical Engineering, Shandong University, Jinan 250061, China; Shenzhen Research Institute of Shandong University, Shenzhen 518000, China.
Journal of colloid and interface science
|October 24, 2025
概括
在纳米孔中控制的离子电流整流 (ICR) 通过战略设计表面电荷分布来优化. 孔壁上的充电长度比例约为0.3,最大限度地提高了ICR,这对于纳米流体设备至关重要.
科学领域:
- 纳米技术 纳米技术
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 单极纳米孔具有不均的表面电荷分布,可以实现离子电流校正 (ICR).
- 对于纳米流体传感器,离子电路和离子放大器等应用来说,ICR至关重要.
- 了解表面电荷如何调节离子运输是优化纳米孔性能的关键.
研究的目的:
- 系统地研究充电长度对内部孔壁对离子传输和ICR的影响.
- 为了确定在短单极纳米孔中最大化ICR的最佳充电长度比例.
- 分析外部表面电荷对增强ICR的影响及其与纳米孔参数的关系.
主要方法:
- 计算模拟被用来通过单极纳米孔模拟离子运输.
- 充电长度,孔径,盐度和应用电压的系统变化.
- 在不同条件下的纳米孔内对离子丰富和耗尽的分析.
主要成果:
- 100nm单极纳米孔的最大ICR度发生在充电-长度比例大约为0.3.3.
- 这种最佳比例 (∼0.3) 在各种模拟条件和纳米孔参数中是一致的.
- 外表面电荷通过促进离子运输显著增强ICR,有效宽度取决于孔径几何,电荷密度,电压和盐度.
结论:
- 充电-长度比率≤0.3是最大化短单极纳米孔ICR的特征值.
- 外表面电荷在增强ICR方面发挥着至关重要的作用,为提高性能提供了设计策略.
- 这项研究为设计单极纳米孔和多孔膜提供了有价值的见解,为先进的纳米流体应用提供了量身定制的电荷配置.
相关概念视频
01:18Patch Clamp
6.3K
Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
6.3K
01:24Non-gated Ion Channels
8.0K
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
8.0K
01:19Ion Channels
91.1K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.1K
01:12Mechanically-gated Ion Channels
7.6K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
7.6K
01:21Electrochemical Gradient and Channel Proteins: An Overview
4.3K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
4.3K
01:17Pore Transport and Ion-Pair Transport
1.1K
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
1.1K