Document Detail

Enhanced Adhesion of Elastic Materials to Small-Scale Wrinkles.
MedLine Citation:
PMID:  23025884     Owner:  NLM     Status:  Publisher    
The adhesive properties of a material can be greatly affected simply by wrinkling its surface. We show the importance of selecting the wrinkle feature sizes (amplitude, b and wavelength, λ) that complement the materials-defined length scale related to the adhesion energy and modulus. A rigid circular cylindrical punch patterned with aligned wrinkles ranging in amplitude from 0.5 to 5.0μm with a fixed aspect ratio of 0.1 is used to characterize the adhesion of elastic films of smooth polydimethyl siloxane (PDMS). The crosslinker concentration used to form the PDMS layers is varied to determine the impact of materials properties on wrinkled surface adhesion. The elastic films have an average thickness of 240μm while the average probe radius is 1mm, leading to a confined contact scenario. Separation stress and work of debonding are presented for each crosslinker concentration with testing rates ranging over three orders of magnitude. For stiffer films (10wt% crosslinker, E'~3.00MPa), small wrinkles (b~0.5μm) increase the separation stress by nearly 200% relative to a smooth interface while large wrinkles (b~5.0μm) are shown to significantly reduce adhesion. A substantial increase in the debonding energy is also observed for these small amplitude wrinkles contacting stiff materials. No discernible impact of wrinkled surface topography on the adhesion of softer (2 and 4wt% crosslinker, 0.05MPa<E'<0.30MPa) films is measured.
Chelsea Simone Davis; David Martina; Costantino Creton; Anke Lindner; Alfred J Crosby
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-1
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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