Fabrication of a Peel Tester for Gecko Inspired Adhesive Tape

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Presentation transcript:

Fabrication of a Peel Tester for Gecko Inspired Adhesive Tape Undergraduate Researcher: Craig Hossfeld Advisor: Dr. Carl Frick

Gecko Tape Background Observation of animals ability to climb walls Behavior linked to fiber structures on animals feet Van der Waals forces create adhesion ( Arzt et al.)

Gecko Tape Invention Mechanism for Gecko attachment inspired micro-patterned adhesive surfaces These tapes came to be known as “Gecko Tape” Many different fibril designs are possible and created (Kamperman et al.)

The Institute of New Materials (INM) Advanced materials company based out of Saarbrucken Germany Large focus in micro-patterned surfaces Formal collaboration established for the project (Functional surfaces…)

Fabrication Fabrication is difficult Many ways to synthesize Soft molding used in our lab Receive molds from INM

Current Testing Testing of micro-patterned adhesive surfaces is not standardized Focused on better fabrication techniques or mimicking biological observations Adhesion studies extremely difficult to compare Normal adhesion tests have been performed widely

Normal Adhesion Testing Research has been focused on Normal Adhesion testing Force results are straight forward Insight to detachment behavior is limited (Kamperman et al.)

Peel Testing Allows for detachment properties to be examined directly Testing reveals insight into the practical use of these adhesives Testing will lead to a more fundamental knowledge of Gecko Tape adhesion (Kamperman et al.)

Peel Testing Difficulty

Peel Tester Design Design based off of machines used to test “common” adhesive tapes Moving base to allow for constant angle tests Designed to fit load frames found in most materials labs (Instron…)

Peel Tester

Functioning Peel Tester

Future Research Continue research this summer with NSF-EPSCoR funding Samples will be created in lab as well as sent from the INM

Future Research Cont. Establish deeper insights into fundamental mechanisms of adhesion Peel test samples well characterized in normal adhesion Investigate effect of pillar geometry, size, length, etc. (Arzt et al.)

Questions

Work Cited E. Arzt, S. Gorb, R Spolenak, Proc. Natl. Acad. Sci. U. S. A. 100 (2003) 10603 Functional Surfaces. Leibniz-Institut fur Neue Materialen, n.d. Web. 30 Apr. 2011. <http://translate.google.com/translate?hl=en&sl=de&u=http://www.inm-gmbh.de/ &ei=ya67TdmqAYyasAP_nJjBBQ&sa=X&oi=translate&ct=result&resnum=1&ved=0CCAQ7gEwAA&prev=/ search%3Fq%3Dinstitute%2Bof%2Bnew%2Bmaterials%26hl%3Den%26biw%3D1318%26bih%3D720%26prmd%3Divns>. M Kamperman, E. Kroner, A. Del Campo, R.M. Mcmeeking, E. Arzt, Adv. Eng. Mater.