通过聚合物竞争性吸附,通过油水接口增强表面活性剂的运输
Wenzhu Xia1, Boyao Wen1, Zhengyuan Luo1
1State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Langmuir : the ACS journal of surfaces and colloids
|January 24, 2026
概括
聚乙烯甘醇 (PEG) 层可以通过降低能量障碍,令人惊地加速二甲基硫酸盐 (SDS) 的界面运输. 这一发现挑战了对交通障碍的传统观点,并为两动物行为提供了新的见解.
科学领域:
- 接口现象 接口现象
- 物理化学 物理化学
- 材料科学是一种材料科学.
背景情况:
- 跨界面的两性分子运输对于自乳化和药物输送等应用至关重要.
- 了解界面上的质量转移阻力和能量障碍仍然是一个挑战.
研究的目的:
- 量化二甲基硫酸盐 (SDS) 运输在用聚乙烯糖醇 (PEG) 修改的水/二甲基接口上的能量障碍.
- 研究PEG覆盖密度对SDS界面扩散和保留时间的影响.
主要方法:
- 粗粒度分子动力学 (CGMD) 模拟.
- 雨采样方法来量化能源障碍.
- 概括的朗格温方程来描述扩散.
- 对扩散系数和保留时间的分子动力学轨迹的分析.
主要成果:
- 适当的PEG层覆盖可以将SDS脱吸能量屏障降低高达23.8%.
- SDS和PEG之间的竞争性吸附平衡了脱吸能量,减少了界面相互作用能量.
- PEG消除了SDS"翻转",削弱了界面约束,增加了分子自由.
- 界面扩散系数增加数量级,保留时间显著减少.
结论:
- PEG层可以通过修改界面能量景观来加速两运输,这与固态障碍的预期相反.
- 这项工作为设计和控制具有不对称相亲和力的两动物的质量转移速率和驱动力提供了理论见解.
相关概念视频
02:34Competition
24.4K
When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
24.4K
02:34Polymers
40.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.6K
01:09Analyte Adsorption and Distribution
2.5K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
2.5K
02:04Protein-protein Interfaces
14.6K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
14.6K
02:34Water and Mineral Acquisition
35.4K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
35.4K
01:19Facilitated Transport
146.9K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
146.9K