Artículo
Mechanically switchable wetting petal effect in self‐patterned nanocolumnar films on poly(Dimethylsiloxane)
Autor/es | Parra Barranco, Julián
López Santos, Carmen Sánchez Valencia, Juan Ramón Borrás Martos, Ana Isabel Rodríguez González-Elipe, Agustín Barranco Quero, Ángel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear Universidad de Sevilla. Departamento de Física Aplicada I |
Fecha de publicación | 2021 |
Fecha de depósito | 2022-01-13 |
Publicado en |
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Resumen | Switchable mechanically induced changes in the wetting behavior of surfaces are of para-mount importance for advanced microfluidic, self‐cleaning and biomedical applications. In this work we show that the well‐known ... Switchable mechanically induced changes in the wetting behavior of surfaces are of para-mount importance for advanced microfluidic, self‐cleaning and biomedical applications. In this work we show that the well‐known polydimethylsiloxane (PDMS) elastomer develops self‐patterning when it is coated with nanostructured TiO2 films prepared by physical vapor deposition at glancing angles and subsequently subjected to a mechanical deformation. Thus, unlike the disordered wrinkled surfaces typically created by deformation of the bare elastomer, well‐ordered and aligned micro‐scaled grooves form on TiO2/PDMS after the first post‐deposition bending or stretching event. These regularly patterned surfaces can be reversibly modified by mechanical deformation, thereby inducing a switchable and reversible wetting petal effect and the sliding of liquid droplets. When performed in a dynamic way, this mechanical actuation produces a unique capacity of liquid droplets (water and diiodomethane) transport and tweezing, this latter through their selective capture and release depending on their volume and chemical characteristics. Scanning electron and atomic force microscopy studies of the strained samples showed that a dual‐scale rough-ness, a parallel alignment of patterned grooves and their reversible widening upon deformation, are critical factors controlling this singular sliding behavior and the possibility to tailor their response by the appropriate manufacturing of surface structures. |
Identificador del proyecto | 899352
PID2019- 110430GB-C21 PID2019-109603RA-I0 MAT2013-40852-R MAT2013- 42900-P 201560E055 AT17-6079 P18-RT-3480 |
Cita | Parra Barranco, J., López Santos, C., Sánchez Valencia, J.R., Borrás Martos, A.I., Rodríguez González-Elipe, A. y Barranco Quero, Á. (2021). Mechanically switchable wetting petal effect in self‐patterned nanocolumnar films on poly(Dimethylsiloxane). Nanomaterials, 11 (10), 2566. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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Mechanically Switchable Wetting.pdf | 3.959Mb | [PDF] | Ver/ | |