相关实验视频
Updated: Feb 9, 2026

06:10
Detection of Viruses from Bioaerosols Using Anion Exchange Resin
Published on: August 22, 2018
8.7K
对抗离子释放的热力学对于离子交换膜导电性至关重要
Michael T Kwasny1, Liang Zhu2, Michael A Hickner2
1Department of Polymer Science and Engineering , University of Massachusetts Amherst , Amherst , Massachusetts 01003 , United States.
Journal of the American Chemical Society
|June 15, 2018
概括
这项研究表明,基于的离子交换膜 (AEM) 由于阴离子对电离子的联系较弱,因此具有较高的离子导电性. 异热定位热量计 (ITC) 确定了对于预测AEM性能至关重要的热力学驱动力.
科学领域:
- 材料科学
- 电化学
- 聚合物科学
背景情况:
- 离子交换膜 (AEM) 在电化学应用中至关重要.
- 了解阳离子特性对于优化AEM离子导电性至关重要.
- 现有的水分和离子度不足以解释导电性差异.
研究的目的:
- 使用,和复合物合成和描述基于金属阴离子的AEM.
- 通过同热定位热量计 (ITC) 研究对电离子交换的热力学.
- 阐明了阴离子-反离子协会和AEM离子导电性之间的关系.
主要方法:
- 合成和表征新型二氧化和金属复合物AEM (Ni,Ru,Co).
- 在合成的AEM中测量离子导电性.
- 应用异热定位热量计 (ITC) 来确定反离子交换热力学.
- 对阳离子水合的分析及其在阳离子对阳离子协会中的作用.
主要成果:
- 与和相比,复合体AEM的离子导电性更高.
- 标准指标 (水分,离子度,激活能量) 并不能完全解释导电率的变化.
- ITC 发现离子与反离子的关联较弱,因反离子交换的总变化较小 (ΔHtot).
- 被确定为阴离子-对离子对强度的关键因素是阴离子水合,而不是膜散装水合.
结论:
- 异热定位热量计 (ITC) 是一个强大的工具来量化控制 AEM 导电性的热力学参数.
- 由阴离体水化驱动的较弱的阴离子-对电离子联结增强了AEM中的离子导电性.
- 这项工作为设计和预测AEM的性能提供了新的热力学框架.
相关概念视频
Second Law of Thermodynamics
27.1K
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
27.1K
Second Law of Thermodynamics
68.6K
The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
68.6K
Third Law of Thermodynamics
22.1K
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
22.1K
First Law of Thermodynamics
80.9K
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed. This can be demonstrated within a classic food web where light energy from the sun is harnessed as radiant energy by plants, converted into chemical energy, and stored as complex carbohydrates. The vegetation is then consumed by animals and during the digestion process, the sugars release energy as heat. The sugars also produce chemical energy that either gets used up doing work, stored in...
80.9K
First Law of Thermodynamics
41.1K
Energy Conservation
41.1K
Gas Exchange and Transport
77.0K
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
77.0K

