在多电解质环的溶液中集群形成
Roman Staňo1,2, Jan Smrek1, Christos N Likos1
1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
ACS nano
|September 20, 2023
概括
竞争对手的价值控制了多电解质环组件. 三价离子促进稳定的圆柱形堆,而单价离子导致密度依赖的回入序列和这些聚合物溶液中的潜在玻璃过渡.
科学领域:
- 聚合物物理 聚合物物理
- 软物质物理学 软物质物理学
- 计算化学是一种计算化学.
背景情况:
- 半柔性多电解质环聚合物,类似于DNA微圆,在生物系统中至关重要.
- 了解它们的溶液行为是控制材料属性的关键.
研究的目的:
- 为了研究 counterion 价值对缩的多电解质环溶液的自我组装和动态的影响.
- 探索不同的离子环境如何影响聚合物的形成和稳定性.
主要方法:
- 使用了分子动力学模拟.
- 探索的系统具有不同的 counterion 价值 (单价和三价).
- 分析了聚合物的结构形态和动态行为.
主要成果:
- 环聚合物一般组装成纳米圆柱形堆.
- 三价对应子通过凝结稳定集群,减轻排斥和促进相位分离.
- 单价相对子诱导密度再入堆的形成,导致高度的透性崩.
- 集群阶段表现出集群玻璃动态;崩的阶段显示出初始的玻璃到玻璃过渡.
结论:
- 对照条件对于指导多电解质环溶液的自我组装,形态和动态至关重要.
- 三价离子可以诱导排序和相位分离,而单价离子会导致复杂的密度依赖行为和潜在的玻璃过渡.
相关概念视频
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
03:45Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
02:33Stereoisomerism of Cyclic Compounds
9.0K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
9.0K
02:16Solution Formation
31.8K
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
This selective...
This selective...
31.8K