Video Experimental Relacionado
Updated: Mar 29, 2026
07:01
Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
Published on: January 25, 2018
10.6K
Estabilidad mecánica de las monocapas de partículas de poliestireno y Janus en la interfaz aire/agua
Jessica Lenis1,2, Sepideh Razavi1, Kathleen D Cao2
1Department of Chemical Engineering, City College of City University of New York , New York, New York 10031, United States.
Journal of the American Chemical Society
|November 21, 2015
Resumen
Las partículas de Janus, con su naturaleza anfifílica, exhiben mecanismos de colapso únicos en las interfaces aire/agua. A diferencia de las películas homogéneas, las películas de partículas de Janus sufren subducción, lo que sugiere propiedades de materiales diseñados para interfaces cargadas de partículas.
Área de la Ciencia:
- Ciencias de los materiales
- Química de las superficies
- Física de la materia blanda
Sus antecedentes:
- Las interfaces cargadas de partículas son cruciales en varios procesos naturales e industriales.
- Comprender las inestabilidades interfaciales es clave para controlar el comportamiento del material.
- Las partículas de superficie anisotrópica (Janus) ofrecen potenciales de interacción únicos.
Objetivo del estudio:
- Investigar la inestabilidad de compresión de las interfaces aire/agua cargadas de partículas.
- Para comparar los mecanismos de colapso de las películas de partículas homogéneas frente a Janus.
- Explorar el potencial de las propiedades de los materiales de ingeniería utilizando partículas anisotrópicas.
Principales métodos:
- Análisis isotérmico de Langmuir para caracterizar el comportamiento interfacial.
- Caracterización microestructural de las películas de partículas comprimidas.
- Investigación experimental de la dinámica de compresión interfacial.
Principales resultados:
- Las películas de partículas de poliestireno homogéneas mostraron doblamiento y plegamiento interfacial, consistente con la elasticidad clásica.
- Las películas de partículas de Janus exhibieron un modo de colapso distinto a través de la subducción.
- Las interacciones de partículas anisotrópicas conducen a nuevos comportamientos de película.
Conclusiones:
- Las partículas Janus de superficie anisotrópica inducen mecanismos de colapso únicos en las películas cargadas de partículas.
- La anisotropía de partículas diseñadas puede conducir a propiedades materiales predecibles y novedosas.
- Esta investigación abre caminos para el diseño de materiales interfaciales avanzados.
Videos de Conceptos Relacionados
01:08Molecular Weight of Step-Growth Polymers
3.0K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
3.0K
01:11Buoyancy and Stability for Submerged and Floating Bodies
4.5K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
4.5K
01:29The Colloidal State
142
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...
142
01:22Surface Tension of Fluid
1.9K
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...
1.9K
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
908
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
908
01:28Stability of Conjugated Dienes
4.7K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
4.7K