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Friction Dynamics of Foams under Nonlinear Motion
Kei Kikuchi1, Akari Iwasawa1, Mitsuki Omori1
1Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan.
ACS Omega
|May 23, 2022
Summary
This study reveals foams exhibit unique velocity-dependent friction, unlike solids. Additives enhance foam friction, lubricant effects, and durability, offering insights into soft material dynamics.
Area of Science:
- Materials Science
- Rheology
- Soft Matter Physics
Background:
- Foams are viscoelastic materials with complex mechanical behaviors.
- Understanding friction dynamics in soft materials is crucial for various applications.
Purpose of the Study:
- To investigate the friction dynamics of foams under sinusoidal motion.
- To characterize the unique friction profiles and velocity dependence in foams.
- To explore the impact of additives on foam friction and durability.
Main Methods:
- Utilized a sinusoidal motion friction evaluation system to test foams between acrylic plates.
- Analyzed friction profiles under accelerated conditions, focusing on velocity dependence.
- Investigated the effects of adding a thickener to the foam formulation.
Main Results:
- Foams displayed velocity-dependent friction profiles without static friction, differing from solid surfaces.
- Friction force in foams increased with velocity, following a power law with an index <1.
- Additives increased friction force, response delay, and improved foam durability against normal and shear forces.
Conclusions:
- Foam friction is governed by lubricant film formation and dissipative modes like surfactant diffusion and bubble slip.
- Thickeners enhance foam friction properties and stability, suggesting potential for tailored material design.
- These findings advance the understanding of dynamic phenomena in viscoelastic soft materials.
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