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Enhanced Shear Adhesion by Mechanical Interlocking of Dual‐ S caled Elastomeric Micropillars With Embedded Silica Particles
Author(s) -
Rahmawan Yudi,
Kang Seong Min,
Lee Su Yeon,
Suh KahpYang,
Yang Shu
Publication year - 2013
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201300149
Subject(s) - materials science , interlocking , elastomer , composite material , adhesion , shear strength (soil) , shear (geology) , particle (ecology) , particle size , pillar , nanotechnology , structural engineering , chemistry , oceanography , environmental science , soil science , engineering , soil water , geology
Enhanced shear adhesion of mechanically interlocked dual‐scaled micropillars embedded with silica particles is demonstrated. Arrays of elastomeric polyurethane acrylate micropillars with variable pillar diameter, height, aspect ratio (AR = diameter/height), and spacing ratio (SR = pillar‐to‐pillar distance/diameter) are decorated with silica particles of 100 nm to 1 μm on the pillar heads. The high‐density protrusions provided by a silica particle assembly (1 μm diameter) on the micropillar heads (5 μm diameter, AR = 8, SR = 2) increase the shear adhesion strength by an order of magnitude from 4.1 (between pristine micropillars) to 48.5 N cm −2 . The adhesion strength is proportional to the particle size and the AR of micropillars, and inversely proportional to the SR. A simple mathematical model is derived by incorporating the interdigitation state of interlocking adhesion forces generated by the contacts between pillars and particle protrusions. Our model and SEM images also suggest that only ≈20% of micropillars participate in the actual contact.