通过界面相互作用抑制MXene/聚合物纳米复合材料中的介电损失
Shaobo Tu1,2, Longguo Qiu1,2, Chen Liu2
1School of Physics and Materials Science, Nanchang University, 999 Xuefu Road, Honggutan District, Nanchang, Jiangxi 330031, China.
ACS nano
|March 25, 2024
概括
这项研究将盐蚀刻的MXene引入聚合物复合材料中,显著提高介电电容性,同时保持低介电损耗. 这一进步解决了聚合物介电性能在各种应用中的关键局限性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 纳米技术 纳米技术
背景情况:
- 聚合物复合材料经常遭受高介电损耗,限制了它们的实际应用.
- 接口空间充电和泄漏电流是这些材料中介电损失的主要原因.
研究的目的:
- 通过减少介电损失和增加介电电容量来增强聚合物复合材料的介电特性.
- 为了研究将盐蚀刻MXene纳入P(VDF-TrFE-CFE) /PMMA混合矩阵的效果.
主要方法:
- 在聚乙烯化物-三乙烯-化乙烯 (PVDF-TrFE-CFE) /聚甲基酸盐 (PMMA) 混合基质中嵌入化盐蚀刻的MXene.
- 分析界面相互作用,聚合物链运动和分子排列.
- 在广的频率范围内测量介电电容和介电损耗.
主要成果:
- 在MXene和聚合物矩阵之间观察到强烈的界面相互作用,形成密集的内部聚合物层.
- 介电损失被显著抑制,介电电容率明显增加.
- 一种含有2.8%重量%MXene填充剂的复合材料在1kHz时显示介电常数从~52增加到~180,介电损失仍然很低 (~0.06).
结论:
- 在聚合物复合材料中加入化盐蚀刻的MXene有效抑制介电损失.
- 增强的介电性能归因于聚合物链运动受限和MXene-聚合物接口上的密集分子排列.
- 这种方法为开发高性能介电聚合物复合材料提供了一个有希望的战略.
相关概念视频
01:27Electrostatic Boundary Conditions in Dielectrics
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 permittivity.
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 permittivity.
01:06Interfacial Electrochemical Methods: Overview
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...