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Colloids

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...

Colloids and Suspensions

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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...

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Coloides parcheados activos con dinámica de ajuste de la forma

Zuochen Wang¹, Zhisheng Wang¹, Jiahui Li¹

¹Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China.

Journal of the American Chemical Society

|August 27, 2019

Resumen

Este resumen es generado por máquina.

Los investigadores ajustaron con precisión la dinámica del coloide activo mediante la síntesis de partículas irregulares de baja simetría. Estos coloides de ingeniería permiten el control de la locomoción y el ensamblaje de micro y nanomáquinas avanzadas.

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Área de la Ciencia:

Ciencia de los coloides
Física de la materia blanda
Ciencias de los materiales

Sus antecedentes:

El control de los coloides activos es clave para los sistemas fuera de equilibrio y las micro máquinas.
La locomoción autónoma y el ensamblaje espontáneo de partículas coloidales presentan desafíos significativos.

Objetivo del estudio:

Para demostrar el ajuste preciso de la dinámica de los coloides activos.
Introducir la síntesis de coloides parches activos con formas de baja simetría.
Para explorar la información codificada por la forma, la programación de la locomotora y los comportamientos de ensamblaje.

Principales métodos:

Síntesis a granel de coloides irregulares de baja simetría mediante un método de encapsulación en racimo.
Utilizando campos eléctricos de CA para modular la propulsión de partículas, el frenado y la dirección.
Investigando el impacto de la geometría de partículas, la configuración de parches y las relaciones de aspecto en la dinámica.

Principales resultados:

Modulación de la velocidad de propulsión de partículas, frenado y dirección a través de parches asimétricos y ángulos de flexión.
Formación de estructuras dinámicas y reconfigurables como giradores y nadadores cooperativos a partir de partículas monopatch.
Demostración de la unión direccional en conjuntos dinámicos utilizando partículas con parches de tamaño diferente.

Conclusiones:

Los coloides irregulares de baja simetría ofrecen un control preciso sobre la dinámica de los coloides activos.
La programabilidad de la forma es una herramienta poderosa para diseñar comportamientos coloidales complejos.
La exploración futura con diversos estímulos externos promete nuevas dinámicas y estructuras.