Rates of cavity filling by liquids

Proceedings of the National Academy of Sciences of the United States of America
Dongjin SeoJacob N Israelachvili

Abstract

Understanding the fundamental wetting behavior of liquids on surfaces with pores or cavities provides insights into the wetting phenomena associated with rough or patterned surfaces, such as skin and fabrics, as well as the development of everyday products such as ointments and paints, and industrial applications such as enhanced oil recovery and pitting during chemical mechanical polishing. We have studied, both experimentally and theoretically, the dynamics of the transitions from the unfilled/partially filled (Cassie-Baxter) wetting state to the fully filled (Wenzel) wetting state on intrinsically hydrophilic surfaces (intrinsic water contact angle <90°, where the Wenzel state is always the thermodynamically favorable state, while a temporary metastable Cassie-Baxter state can also exist) to determine the variables that control the rates of such transitions. We prepared silicon wafers with cylindrical cavities of different geometries and immersed them in bulk water. With bright-field and confocal fluorescence microscopy, we observed the details of, and the rates associated with, water penetration into the cavities from the bulk. We find that unconnected, reentrant cavities (i.e., cavities that open up below the surface) have...Continue Reading

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Citations

Apr 8, 2020·Science Advances·Silvestre Roberto Gonzalez-AvilaClaus-Dieter Ohl
Dec 29, 2019·Scientific Reports·Siva Rama KrishnanShawn A Putnam
Feb 2, 2021·ACS Applied Materials & Interfaces·Binyu ZhaoLongquan Chen
Feb 20, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Zhongzheng WangYixiang Gan

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