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Synthetic Dry Adhesives

a technology of synthetic adhesives and adhesives, applied in the direction of film/foil adhesives, coatings, transportation and packaging, etc., can solve the problems of high cost, high cost, and limited use of such adhesives in climbing applications, and achieve the effect of improving adhesion

Inactive Publication Date: 2012-11-22
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]In a further aspect of the invention, a siping step is used when the adhesive is de-molded, where the siping step includes a cut perpendicular to the tapered lamellar ridge at a desired frequency to improve adhesion on textured surfaces having micro-scale roughness, where independent adhesive sections of the extending tapered lamellar ridge conform to the textured surface.

Problems solved by technology

However, the use of such adhesives in applications such as climbing has been much more limited, with just a few examples reported.
In any other case, energy will be wasted as it is expended in attaching and detaching the adhesive for each step.
The necessity of a thick photo-resist layer combined with the requirement for high precision alignment of exposures resulted in a time consuming, expensive mold fabrication process with relatively low yield.

Method used

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Examples

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Embodiment Construction

[0038]Directional dry adhesives are inspired by animals such as geckos and are a particularly useful technology for climbing applications. Previously, they have generally been manufactured using photolithographic processes. The current invention provides a micro-machining process that makes cuts in a soft material using a sharp, lubricated tool to create closely spaced negative cavities of a desired shape. The machined material becomes a mold into which an elastomer is cast to create the directional adhesive. The trajectory of the tool is varied to avoid plastic flow of the mold material that may adversely affect adjacent cavities. The relationship between tool trajectory and resulting cavity shape is established through modeling and process characterization experiments.

[0039]The micro-machining process of the current invention is much less expensive than previous photolithographic processes used to create similar features and allows greater flexibility with respect to the micro-sca...

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Abstract

A method of forming synthetic dry adhesives is provided that includes using a wedge-shaped tool to form mold cavities in a mold, filling the mold cavities with an elastomeric adhesive, removing the elastomeric adhesive from the mold, where a tapered lamellar ridge extends from a surface of the elastomeric adhesive, treating a tip of the extending ridge with a film of uncured elastomeric material, and curing the film of uncured material while the extending ridge is pressed against a substrate surface having a smoothness or texture. The synthetic dry adhesive comprises a close-packed array of tapered lamellar ridges, where the centerline of a ridge is angled relative to a direction normal to the synthetic dry adhesive and the cross section includes an internal taper. The tapered ridge bends when it contacts a surface, whereupon the radius of curvature of the ridge increases monotonically with increasing shear load.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Patent Application 61 / 517,496 filed Apr. 20, 2011, which is incorporated herein by reference.STATEMENT OF GOVERNMENT SPONSORED SUPPORT[0002]This invention was made with Government support under contract NIRT 0708367 awarded by National Science Foundation (NSF), and under contract 1118729-2-TFLAP awarded by DARPA. The Government has certain rights in this invention.FIELD OF THE INVENTION[0003]This invention relates to synthetic dry adhesives and methods of making thereof.BACKGROUND OF THE INVENTION[0004]Impressive advancements have been made in the field of gecko-inspired synthetic dry adhesives. A large range of manufacturing methods for these adhesives has been reported in the literature. However, the use of such adhesives in applications such as climbing has been much more limited, with just a few examples reported. It has generally been found that the adhesion levels generated in r...

Claims

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Application Information

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IPC IPC(8): C09J7/00B32B3/30B05D5/10
CPCB29C33/3857B29C33/424B29C33/52Y10T428/2457B29C39/006C09J7/00C09J2201/626B29C37/0053C09J2301/31B29C33/3842B29K2083/00B29K2105/0002B29K2105/0097B29K2891/00B29K2995/0077C09J183/04
Inventor CUTKOSKY, MARK R.DAY, PAUL S.EASON, ERIC V.
Owner THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
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