在具有化学反应的活性二元混合物中进行相位分离
Sayantan Mondal1, Prasenjit Das1
1Department of Physical Sciences, Indian Institute of Science Education and Research - Mohali, Knowledge City, Sector 81, SAS Nagar 140306, Punjab, India. prasenjit.das@iisermohali.ac.in.
Soft matter
|May 1, 2025
概括
在具有化学反应的活性二元混合物中,机动性诱导相分离 (MIPS) 表明组件活性和反应速率控制滴滴的形成. 域大小扩散增长,并达到依赖于反应速率的稳定状态.
科学领域:
- 软物质物理学 软物质物理学
- 化学物理 化学物理
- 非平衡系统 非平衡系统
背景情况:
- 活性物质系统表现出在平衡系统中看不到的独特的集体行为.
- 运动诱导相分离 (MIPS) 是活性物质的一个关键现象,导致自我组织.
- 活性混合物中的活性,相互作用和化学反应之间的相互作用尚未完全理解.
研究的目的:
- 在活性二元混合物中研究可逆化学反应 (A B) 对MIPS的影响.
- 确定反应速率和相对成分活性如何影响新兴形态和域增长动态.
- 描述稳态域结构及其扩展关系.
主要方法:
- 化学反应速率 (Γ) 的现象学纳入密度场的现有MIPS演变方程.
- 基于反应速率 (Γ) 和相对活性 (Δ) 的稳定状态域形态的分析.
- 计算等时相关函数 (C,r,t) 和结构因子 (S,k,t),以描述域形态.
- 调查平均域大小 (L(t)) 和其稳定状态值 (Lss) 的时间演变.
主要成果:
- 稳定状态域形态取决于反应速率 (Γ) 和相对活性 (Δ).
- 对于足够高的 Γ 和 Δ ≠ 1,更活跃的成分形成滴状结构.
- 在达到稳定状态之前,域增长遵循L (t) ∼t (t) 1/3) (扩散增长).
- 稳定状态域大小表现出一个缩放关系Lss ∼ Γ^{-1/4),独立于Δ.
结论:
- 化学反应在活性二元混合物中显著改变MIPS,从而能够控制新出现的结构.
- 反应速率是决定稳态形态和域大小的关键参数.
- 观察到的缩放定律为反应条件下的活性相分离的动态提供了基本的见解.
相关概念视频
01:13¹H NMR: Complex Splitting
1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
01:01Distillation: Vapor–Liquid Equilibria
2.6K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
2.6K
02:20Dynamic Equilibrium
49.9K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
49.9K
01:21Mass Spectrometry: Complex Analysis
685
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
685
02:30Racemic Mixtures and the Resolution of Enantiomers
18.0K
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
18.0K
01:17Drug Metabolism: Phase I Reactions
2.9K
A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...
2.9K