Self-similarity of contact line depinning from textured surfaces.

Abstract:

:The mobility of drops on surfaces is important in many biological and industrial processes, but the phenomena governing their adhesion, which is dictated by the morphology of the three-phase contact line, remain unclear. Here we describe a technique for measuring the dynamic behaviour of the three-phase contact line at micron length scales using environmental scanning electron microscopy. We examine a superhydrophobic surface on which a drop's adhesion is governed by capillary bridges at the receding contact line. We measure the microscale receding contact angle of each bridge and show that the Gibbs criterion is satisfied at the microscale. We reveal a hitherto unknown self-similar depinning mechanism that shows how some hierarchical textures such as lotus leaves lead to reduced pinning, and counter-intuitively, how some lead to increased pinning. We develop a model to predict adhesion force and experimentally verify the model's broad applicability on both synthetic and natural textured surfaces.

journal_name

Nat Commun

journal_title

Nature communications

authors

Paxson AT,Varanasi KK

doi

10.1038/ncomms2482

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

1492

issn

2041-1723

pii

ncomms2482

journal_volume

4

pub_type

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