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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
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Topographic de-adhesion in the viscoelastic limit
Nhung Nguyen1, Eugenio Hamm Hahn2, Sachin Velankar3
1Department of Surgery, The University of Chicago, Chicago, IL, USA.
Journal of the Royal Society, Interface
|January 11, 2023
Summary
This study enhances self-cleaning surfaces by analyzing how viscoelastic biofoulants interact with dynamic topography. Findings reveal key parameters for optimizing surface renewal through topographic de-adhesion in the viscoelastic regime.
Area of Science:
- Materials Science
- Surface Chemistry
- Biophysics
Background:
- Natural surfaces effectively resist biofouling using dynamic topography.
- Current models for self-cleaning surfaces are limited to elastic biofoulants.
- Viscoelastic biofoulants exhibit complex time-dependent behaviors like softening and varied loading rates.
Purpose of the Study:
- To extend the understanding of topographic de-adhesion to viscoelastic biofoulants.
- To investigate the nonlinear, time-dependent interactions governing biofoulant removal.
- To identify key parameters for optimizing self-cleaning artificial surfaces.
Main Methods:
- Developed analytical and finite-element models.
- Incorporated dimensionless parameters representing biofoulant stiffness reduction, relaxation time, loading rate, and critical strain.
- Compared theoretical predictions with numerical simulations.
Main Results:
- Theoretical predictions aligned well with numerical simulations.
- Elucidated the complex interplay of factors in the viscoelastic regime.
- Identified three critical dimensionless parameters influencing de-adhesion.
Conclusions:
- The study provides a theoretical framework for viscoelastic biofoulant de-adhesion.
- Offers insights into tuning parameters for enhanced self-cleaning surface performance.
- Enables optimization of surface renewal strategies for artificial surfaces.
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