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Morfologías de líquidos en superficies estructuradas: desde microcanales hasta microchips
Gau1, Herminghaus, Lenz
1H. Gau and S. Herminghaus, Max-Planck-Institute (MPI) of Colloids and Interfaces, Rudower Chaussee 5, D-12489, Berlin-Adlershof, Germany. P. Lenz and R. Lipowsky, MPI of Colloids and Interfaces, Kantstrasse 55, D-14513 Teltow-Seehof, Germany.
Science (New York, N.Y.)
|January 5, 1999
Resumen
Los microcanales líquidos en superficies estructuradas exhiben una inestabilidad de forma, pasando de un estado uniforme a una morfología abultada. Esta nueva inestabilidad en los sistemas microfluídicos ofrece potencial para microchips de fluidos avanzados y microrreactores.
Área de la Ciencia:
- Ciencias de la superficie y microfluídica.
- Física de fluidos e inestabilidades.
Sus antecedentes:
- Los microcanales líquidos se fabrican en superficies estructuradas utilizando humedabilidad modelada.
- Estos canales consisten en rayas hidrófilas en un sustrato hidrofóbico.
Objetivo del estudio:
- Para investigar la inestabilidad de la forma de los microcanales líquidos en superficies estructuradas.
- Para caracterizar la transición de un estado homogéneo a una morfología abultada.
Principales métodos:
- Fabricación de microcanales líquidos utilizando el patrón de wettability.
- Observación y análisis de la evolución de la forma del canal con el aumento del volumen adsorbido.
Principales resultados:
- Se observó una inestabilidad de la forma en los microcanales líquidos por encima de un volumen adsorbido crítico.
- La inestabilidad lleva a una transición de una sección transversal uniforme a una sola protuberancia.
- Este fenómeno difiere de la inestabilidad de la meseta de Rayleigh y representa una bifurcación morfológica.
Conclusiones:
- La inestabilidad observada proporciona un nuevo mecanismo para controlar la morfología de los microcanales.
- El estado abultado permite la construcción de complejas redes de canales.
- Estas redes tienen aplicaciones potenciales en microchips fluidos y microrreactores.
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