贝他因和二甲基链阳离子表面活性剂对界面布置的协同作用:一个分子动力学模拟研究
Mengxin Liu1,2, Hongyan Xiao1, Ruosheng Pan3
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|March 19, 2024
概括
阳离子表面活性剂和贝他因的混合系统可降低界面张力 (IFT). 二甲基硫酸盐 (AOT) 与各种贝他因具有协同效应,可以更好地利用原油.
科学领域:
- 表面活性剂的化学成分
- 合体和表面科学科学
- 计算化学是一种计算化学.
背景情况:
- 混合表面活性剂系统,特别是贝他因和阳离子表面活性剂,在降低界面张力 (IFT) 中表现出显著的协同效应.
- 这些协同效应的应用往往受特定分子大小匹配的要求限制,即离子表面活性剂和贝他因之间的匹配.
- 了解接口行为和协同机制对于优化这些系统至关重要.
研究的目的:
- 在单一和混合系统中研究不同大小的贝他因的二甲基硫酸盐 (AOT) 的界面行为和协同机制.
- 探索AOT如何适应其结构和界面膜的形成,以应对不同的贝联表面活性剂.
- 为了确定分子大小对贝他因/AOT混合物中IFT协同降低的影响.
主要方法:
- 用分子动力学模拟来分析AOT和贝他因在接口上的结构和定向参数.
- 分析的关键参数包括疏水尾链角,碳原子高度,链延伸和倾斜角.
- 进行了界面张力 (IFT) 实验,以验证模拟结果并量化协同效应.
主要成果:
- 在单一系统中,AOT表现出较小的疏水尾链中心角度,优先延伸到油阶段.
- 在与不同的贝他因混合后,AOT通过改变其链方向来填补界面空缺,形成更紧的界面膜来表现出适应性.
- 与单一的AOT系统相比,所有研究的贝他因/AOT混合系统都获得了较低的IFT值,证实了AOT与结构多样化的贝他因的协同作用.
结论:
- AOT表现出可调节的界面行为,适应其结构以优化界面膜的形成,当与不同分子大小的贝他因混合时.
- 在不同的贝他因结构中,AOT和贝他因之间的协同效应是强大的,导致IFT显著减少.
- 这项研究为基于贝他因的混合表面活性剂系统的合理设计和应用提供了宝贵的见解,特别是在增强石油回收方面.
更多相关视频
07:31Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
Published on: September 1, 2023
2.2K
08:18Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
Published on: July 27, 2022
1.1K
相关概念视频
03:13Intermolecular Forces
58.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.3K
03:00Solubility
17.5K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
17.5K
02:12Solvating Effects
7.5K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.5K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.0K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.0K
03:22Colloids
17.5K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.5K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.4K