Creasing in microscale, soft static friction.
Justin D GloverXingwei YangRong LongJonathan T PhamPublished in: Nature communications (2023)
Utilizing colloidal probe, lateral force microscopy and simultaneous confocal microscopy, combined with finite element analysis, we investigate how a microparticle starts moving laterally on a soft, adhesive surface. We find that the surface can form a self-contacting crease at the leading front, which results from a buildup of compressive stress. Experimentally, creases are observed on substrates that exhibit either high or low adhesion when measured in the normal direction, motivating the use of simulations to consider the role of adhesion energy and interfacial strength. Our simulations illustrate that the interfacial strength plays a dominating role in the nucleation of a crease. After the crease forms, it progresses through the contact zone in a Schallamach wave-like fashion. Interestingly, our results suggest that this Schallamach wave-like motion is facilitated by free slip at the adhesive, self-contacting interface within the crease.
Keyphrases
- single molecule
- finite element analysis
- ionic liquid
- molecular dynamics simulations
- molecular dynamics
- biofilm formation
- high speed
- high resolution
- monte carlo
- electron transfer
- living cells
- high throughput
- optical coherence tomography
- cell migration
- staphylococcus aureus
- quantum dots
- stress induced
- candida albicans