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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing

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Published on: December 13, 2016

Drop retention force as a function of resting time.

Rafael Tadmor¹, Kumud Chaurasia, Preeti S Yadav

¹Department of Chemical Engineering, Lamar University, Beaumont, Texas 77710, USA. rafael.tadmor@lamar.edu

Langmuir : the ACS Journal of Surfaces and Colloids

|August 5, 2008

Summary

This summary is machine-generated.

The force needed to slide a liquid drop increases with resting time on a surface. This phenomenon, linked to surface tension, is observed across various systems, indicating its general applicability.

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Area of Science:

Fluid dynamics
Surface science
Materials science

Background:

The interaction between liquid drops and solid surfaces is crucial in various scientific and industrial applications.
Understanding the forces involved in initiating drop motion is essential for predicting surface behavior.

Purpose of the Study:

To investigate the effect of resting time on the force required to slide a liquid drop on a surface.
To demonstrate the generality of the resting time phenomenon across different liquid-drop-surface systems.

Main Methods:

Experimental measurement of the sliding force (f) as a function of resting time (t).
Analysis of the rate of change of force with respect to time (df/dt).
Correlation of the force increase (Delta f) with the liquid-vapor surface tension.

Main Results:

The sliding force (f) is a monotonically increasing function of resting time (t).
The rate of force increase (df/dt) is always non-negative and decreases towards zero as resting time increases.
The total force increase (Delta f) correlates with the vertical component of liquid-vapor surface tension.

Conclusions:

A phenomenon where resting time increases the force required to slide a drop exists and is general across systems.
This effect is attributed to surface corrugation caused by the drop, driven by the normal component of surface tension.
The findings provide insights into the adhesion and friction dynamics of liquid drops on surfaces.