相关实验视频
Updated: Jun 11, 2025

09:26
Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
9.7K
揭示聚电解质-体复合体的静电驱动的崩和放松:可调节的通往体组合的途径
Swati Mehta1,2, Jitendra Bahadur1,2, Ashwani Kumar1
1Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Langmuir : the ACS journal of surfaces and colloids
|October 4, 2024
概括
多电解质 - 合体复合体在高度下形成崩的协体,然后膨胀. 这种由静电学和多南效应驱动的结构变化是理解复杂组装的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 生物物理学的生物物理.
背景情况:
- 聚电解质 - 合物 (PEC) 复合物在各种领域至关重要,并表现出复杂的相位过渡.
- 了解控制PEC组件的静电力是至关重要的,但具有挑战性.
- 这些复合体模仿复杂的生物组合,突出显示了它们的意义.
研究的目的:
- 为了研究多电解质-合物复合物的结构演变,在不同的多电解质度.
- 阐明静电相互作用和多南效应在PEC相变中的作用.
- 在模型 PEC 系统中描述同体结构的形成和膨胀.
主要方法:
- 作为一个模型系统,利用了阳离子二氧化合物和阴离子奇托.
- 使用微角X射线/中子 (SAXS/SANS) 散射来分析结构变化.
- 多种多电解质 (奇托桑) 度和电解质度以观察相位过渡.
主要成果:
- 观察到在高聚电解质度 (高达3重量%) 时形成高度崩的同体结构 (体积分数~0.62).
- 在超过3%重量的聚电解质度下,发现了崩组件的胀.
- 证明了临界同化度 (Cs*) 与初始合物度的线性依赖.
- 由于电荷选,在0.2M以上的电解质度下展示了完全的协同溶液溶解.
结论:
- PEC复合体的结构演变是由静电力和多南效应的相互作用决定的.
- 在PEC系统中,凝聚体形成和胀是度依赖的现象.
- 电解质添加为电荷选机制及其对PEC稳定性的影响提供了洞察力.
相关概念视频
Colloidal precipitates
521
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
521
Colloids
17.4K
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...
17.4K
Coagulation
274
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
274
Aqueous Solutions and Heats of Hydration
14.6K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.6K
Mechanism of Filopodia Formation
2.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.3K
Colloids and Suspensions
1.7K
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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
1.7K

