相关实验视频
Updated: May 12, 2025
08:51
Monitoring Protein Adsorption with Solid-state Nanopores
Published on: December 2, 2011
13.5K
化学功能组调节纳米孔中的离子度和pH值
Yaguang Zhu1, Prashant Gupta2, Hamed Gholami Derami2
1Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States.
ACS applied materials & interfaces
|April 29, 2025
概括
纳米孔中的功能组改变了离子度,影响了水的化学成分. 本研究使用等离子纳米传感器来测量这些变化,有助于设计先进的膜技术.
科学领域:
- 纳米技术 纳米技术
- 环境科学 环境科学
- 物理化学 物理化学
背景情况:
- 了解功能化纳米孔中的离子行为对于自然和工程系统至关重要.
- 需要直接测量化学组如何影响纳米孔中的离子度.
研究的目的:
- 开发和利用一个等离子纳米传感器来测量功能化纳米孔中的局部离子度.
- 为了将纳米孔内的离子度与散装溶液度进行比较.
- 阐明不同化学功能组对纳米孔内的离子行为的影响.
主要方法:
- 开发一种能够测量质子,离子 (酸盐,酸盐,硫酸盐,酸盐) 和离子 (,,铜) 的等离子纳米传感器.
- 功能化纳米孔中的离子度与散装溶液度的比较.
- 分析不同功能组 (甲基,基,氨基,基,基) 如何影响纳米孔内的离子分布和pH值.
主要成果:
- 化学功能组明显改变纳米孔内的离子度.
- 纯,甲基和功能化纳米孔显示出增强的阴离子和抑制的阴离子度.
- 水友性功能化纳米孔 (氨基,硫醇,碳酸) 显示pH依赖功能组pKa和金属离子度依赖化学相互作用.
- 发现纳米孔的pH取决于散装溶液的组成,即使在缓冲溶液中,也可能减少2.5单位.
结论:
- 化学功能组显著影响纳米孔内的局部离子度和pH值.
- 这些发现提高了对纳米孔水化学的理解,对于膜淡化,二氧化碳储存和催化等应用至关重要.
- 开发的等离子纳米传感器为局限环境中离子行为的现场分析提供了强大的工具.
相关概念视频
01:17Pore Transport and Ion-Pair Transport
303
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...
303
01:28pH Regulation in Cells
5.9K
pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
5.9K
01:15Potentiometry: Membrane Electrodes
311
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
311
01:19Ion Channels
85.3K
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...
85.3K
02:51Metal-Ligand Bonds
20.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.4K
01:17Ion Exchange
397
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
397