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Superficies repelentes. las superficies repelentes. Convertir una superficie en un superrepelente incluso para mojar
Tingyi Leo Liu1, Chang-Jin C J Kim2
1Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA.
Science (New York, N.Y.)
|November 29, 2014
Resumen
Los investigadores desarrollaron una nueva estructura superficial de doble reentrada que hace que cualquier material sea súper repelente a todos los líquidos, incluidos los líquidos de baja energía desafiantes. Este avance elimina la necesidad de recubrimientos hidrofóbicos y ofrece una mayor durabilidad.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química de las superficies.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Las superficies superhidrofóbicas y superoleofóbicas convencionales se basan en el áspero de los materiales hidrofóbicos.
- Las superficies existentes no pueden repeler líquidos de energía extremadamente baja como los disolventes fluorados, que fácilmente humedecen incluso materiales altamente hidrofóbicos.
Objetivo del estudio:
- Demostrar un método universal para crear superficies súper repelentes independientemente de la hidrofobidad del material.
- Para diseñar superficies capaces de repeler incluso los líquidos de baja energía más desafiantes.
Principales métodos:
- Fabricación de superficies micro y nanoestructuradas con una geometría específica de doble reentrante.
- Utilizando sólo la rugosidad, sin recubrimientos hidrofóbicos, para lograr superrepelencia.
- Prueba de rendimiento de la superficie con una amplia gama de líquidos, incluido el perfluorohexano, en sustratos de sílice, metal y polímeros.
Principales resultados:
- Logró superomnifobia en superficies de sílice, metal y polímero utilizando sólo la estructura de doble reentrante.
- Demostró la capacidad de repeler todos los líquidos probados, incluido el perfluorohexano, un fluido notoriamente difícil de repeler.
- La superficie de sílice superomnifóbica exhibió una estabilidad térmica excepcional (> 1000 ° C) y resistencia a la bioincrustación.
Conclusiones:
- Las estructuras doblemente reentrantes permiten la superrepelencia en cualquier material al minimizar el contacto líquido-sólido.
- Este enfoque supera las limitaciones de los métodos convencionales para repeler líquidos de baja energía.
- Las superficies desarrolladas ofrecen una solución versátil, robusta y sin recubrimiento para la superomnifobia con propiedades de alta temperatura y anti-biofouling.
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