双分散合物在水滴中的自我组织
Young-Sang Cho1, Gi-Ra Yi, Jong-Min Lim
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701 Korea.
Journal of the American Chemical Society
|November 10, 2005
概括
研究人员使用油中的水乳液创建了新的二元合体集群,使各种材料结构成为可能. 较小粒子的排列取决于相互作用,为先进材料提供了新的构建块.
科学领域:
- 材料科学 材料科学 材料科学
- 合体和表面化学
- 自动组装自动组装
背景情况:
- 传统的合体集群通常来自具有均微球的油在水乳液.
- 在狭窄的空间中控制有限的合体群的自我组织是构建物质跨尺度的关键.
研究的目的:
- 开发新的二元合体集群,使用相反的油中的水乳液.
- 研究具有不同尺寸比率和组成的二元合体系统的自我组织.
- 探索这些新型体结构的潜在应用.
主要方法:
- 使用油中的水乳液与/聚烯微球和/纳米颗粒的组合制造二元合体集群.
- 集群形成和结构演变的实验观测.
- 使用Surface Evolver进行数值模拟,以验证实验结果.
主要成果:
- 从油中的水乳液中成功制造出新的二元合体集群,比油中的水系统提供更高的相稳定性和多样性.
- 观察到较大的微球配置没有改变较小的粒子,而较小的粒子排列是由粒子间相互作用决定的.
- 实验结果与Surface Evolver模拟结果是一致的.
结论:
- 油中的水乳液为创建多样化的二元合体集群提供了多功能平台.
- 自组装行为可以根据粒子大小,组成和粒子间相互作用进行调整.
- 这些非同位素集群作为先进材料,光散射器,扩散器和适应性物质的构建块.
相关概念视频
Van der Waals Interactions
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
Cohesion
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
On a surface,...
Intermolecular Forces
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 bonds, and dispersion...
Colloids
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...
Solubility
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, atoms, and/or ions)...
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, atoms, and/or ions)...
The Colloidal State
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...


