Dynamic Measurement of the Force Required to Move a Liquid Drop on a Solid Surface

Dynamic Measurement of the Force Required to Move a Liquid Drop on a Solid Surface

We measured the forces required to slide sessile drops over surfaces. The forces were measured by means of a vertical deflectable capillary stuck in the drop. The drop adhesion force instrument (DAFI) allowed the investigation of the dynamic lateral adhesion force of water drops of 0.1 to 2 μL volum...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir Vol. 28; no. 49; pp. 16812 - 16820
Main Authors: Pilat, D. W, Papadopoulos, P, Schäffel, D, Vollmer, D, Berger, R, Butt, H.-J
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 11-12-2012
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
Water drop
Instruments
Force
Hydrophobicity
Adhesion
Velocity
Solid
Drop
Contact line
Liquid
Dynamics
Defect
Sessile
Anchoring
Diameter
Interface
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We measured the forces required to slide sessile drops over surfaces. The forces were measured by means of a vertical deflectable capillary stuck in the drop. The drop adhesion force instrument (DAFI) allowed the investigation of the dynamic lateral adhesion force of water drops of 0.1 to 2 μL volume at defined velocities. On flat PDMS surfaces, the dynamic lateral adhesion force increases linearly with the diameter of the contact area of the solid–liquid interface and linearly with the sliding velocity. The movement of the drop relative to the surfaces enabled us to resolve the pinning of the three-phase contact line to individual defects. We further investigated a 3D superhydrophobic pillar array. The depinning of the receding part of the rim of the drop occurred almost simultaneously from four to five pillars, giving rise to peaks in the lateral adhesion force.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0743-7463
1520-5827
DOI:10.1021/la3041067