Intermediate States of Wetting on Hierarchical Superhydrophobic Surfaces. Rofman, B., Dehe, S., Frumkin, V., Hardt, S., & Bercovici, M. Langmuir, 36(20):5517-5523, American Chemical Society, 5, 2020. ![Intermediate States of Wetting on Hierarchical Superhydrophobic Surfaces [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website doi abstract bibtex 1 download Wetting transition on superhydrophobic surfaces is commonly described as an abrupt jump between two stable states - either from Cassie to Wenzel for nonhierarchical surfaces or from Cassie to nano-Cassie on hierarchical surfaces. We here experimentally study the electrowetting of hierarchical superhydrophobic surfaces composed of multiple length scales by imaging the light reflections from the gas-liquid interface. We present the existence of a continuous set of intermediate states of wetting through which the gas-liquid interface transitions under a continuously increasing external forcing. This transition is partially reversible and is limited only by localized Cassie to Wenzel transitions at nanodefects in the structure. In addition, we show that even a surface containing many localized wetted regions can still exhibit extremely low contact angle hysteresis, thus remaining useful for many heat transfer and self-cleaning applications. Expanding the classical definition of the Cassie state in the context of hierarchical surfaces, from a single state to a continuum of metastable states ranging from the centimeter to the nanometer scale, is important for a better description of the slip properties of superhydrophobic surfaces and provides new considerations for their effective design.
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title = {Intermediate States of Wetting on Hierarchical Superhydrophobic Surfaces},
type = {article},
year = {2020},
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abstract = {Wetting transition on superhydrophobic surfaces is commonly described as an abrupt jump between two stable states - either from Cassie to Wenzel for nonhierarchical surfaces or from Cassie to nano-Cassie on hierarchical surfaces. We here experimentally study the electrowetting of hierarchical superhydrophobic surfaces composed of multiple length scales by imaging the light reflections from the gas-liquid interface. We present the existence of a continuous set of intermediate states of wetting through which the gas-liquid interface transitions under a continuously increasing external forcing. This transition is partially reversible and is limited only by localized Cassie to Wenzel transitions at nanodefects in the structure. In addition, we show that even a surface containing many localized wetted regions can still exhibit extremely low contact angle hysteresis, thus remaining useful for many heat transfer and self-cleaning applications. Expanding the classical definition of the Cassie state in the context of hierarchical surfaces, from a single state to a continuum of metastable states ranging from the centimeter to the nanometer scale, is important for a better description of the slip properties of superhydrophobic surfaces and provides new considerations for their effective design.},
bibtype = {article},
author = {Rofman, Baruch and Dehe, Sebastian and Frumkin, Valeri and Hardt, Steffen and Bercovici, Moran},
doi = {10.1021/acs.langmuir.0c00499},
journal = {Langmuir},
number = {20}
}
Downloads: 1
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