功能性超粒子是由二元合体悬浮在超疏水表面的蒸发产生的
Anna V Shneidman1, Cathy T Y Zhang1, Nikolaj K Mandsberg2
1Harvard John A. Paulson School of Engineering and Applied Sciences, 150 Western Ave., Boston MA 02134, USA. jaiz@seas.harvard.edu.
Soft matter
|September 13, 2024
概括
研究人员使用在超疏水表面干燥的二元体悬浮物制造了碗形的超粒子. 这些中孔性超粒子显示了甲醇转化催化活性,展示了它们的实际应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 催化剂是一种催化剂.
背景情况:
- 层次结构的超粒子是通过体悬浮液的滴滴蒸发而形成的.
- 与单元系统相比,二元悬挂提供了增强的结构和功能控制.
- 蒸发式联合组装是基本机械学研究的一个可操作的方法.
研究的目的:
- 使用二元合物悬浮物的蒸发式联合组装来产生碗形的超粒子.
- 探索拉斯伯里合体模板,用于创建中孔结构.
- 为了证明合成的超粒子的催化应用.
主要方法:
- 大型聚乙烯微粒和小型无机氧化物纳米粒子 (,,,,) 在超疏水表面上的蒸发式联合组装.
- 使用泰坦纳米颗粒和金色装饰的聚乙烯合体进行拉斯伯里合体模板设计.
- 清除聚合物颗粒以产生半孔性超粒子.
主要成果:
- 成功地产生了具有控制等级结构的碗形超粒子.
- 通过拉斯伯里合物模板表现出中孔性超粒子的合成.
- 展示了甲醇与甲基甲酸盐的氧化合中的超粒子的催化活性.
结论:
- 在超疏水表面的蒸发式联合组装是创建二元超粒子的有效方法.
- 拉斯伯里合物模板设计使得功能性半孔材料的制造成为可能.
- 合成的半孔超粒子在化学转化过程中表现出有希望的催化性能.
相关概念视频
Colloidal precipitates
524
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...
524
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
Solubility
17.3K
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,...
17.3K
Precipitate Formation and Particle Size Control
755
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
755
Surface Tension, Capillary Action, and Viscosity
27.6K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
27.6K
Surface Tension of Fluid
249
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
249


