Dry adhesives and methods of making dry adhesives including a method of making a dry adhesive including applying a liquid polymer to the second end of the stem, molding the liquid polymer on the stem in a mold, wherein the mold includes a recess having a cross-sectional area that is less than a cros
Dry adhesives and methods of making dry adhesives including a method of making a dry adhesive including applying a liquid polymer to the second end of the stem, molding the liquid polymer on the stem in a mold, wherein the mold includes a recess having a cross-sectional area that is less than a cross-sectional area of the second end of the stem, curing the liquid polymer in the mold to form a tip at the second end of the stem, wherein the tip includes a second layer stem; corresponding to the recess in the mold, and removing the tip from the mold after the liquid polymer cures.
대표청구항▼
1. A method of forming a dry adhesive with a structure including a backing layer and a stem, wherein the stem includes first and second ends on opposite sides of the stem, and wherein the first end of the stem is connected to the backing layer, comprising: applying a liquid polymer to the second end
1. A method of forming a dry adhesive with a structure including a backing layer and a stem, wherein the stem includes first and second ends on opposite sides of the stem, and wherein the first end of the stem is connected to the backing layer, comprising: applying a liquid polymer to the second end of the stem;molding the liquid polymer on the stem in a mold, wherein the mold includes a recess having a cross-sectional area that is less than a cross-sectional area of the second end of the stem;curing the liquid polymer in the mold to form a tip at the second end of the stem, wherein the tip includes a second layer stem; corresponding to the recess in the mold; andremoving the tip from the mold after the liquid polymer cures. 2. The method of claim 1, wherein the stem is perpendicular to the backing layer. 3. The method of claim 1, wherein the stem is not perpendicular to the backing layer. 4. The method of claim 1, further comprising: applying a liquid polymer to the second layer stem;molding the liquid polymer on the second layer stem with a second mold, wherein the second mold includes a recess having a cross-sectional area that is less than a cross-sectional area of the second layer stem;curing the liquid polymer in the mold to form a tip on the second layer stem, wherein the tip on the second layer stem includes a third layer stem, and wherein the third layer stem corresponds to the recess in the second mold; andremoving the tip on the second layer stem from the second mold. 5. The method of claim 1, wherein removing the tip from the mold includes etching the mold from the tip. 6. The method of claim 5, further covering the stem with a protective polymer layer before etching the mold. 7. The method of claim 1, wherein the stem is microscale and the second layer stem is nanoscale. 8. The method of claim 1, wherein molding the liquid polymer on the stem includes filling the recess in the mold with the liquid polymer via capillary forces. 9. The method of claim 1, wherein applying a liquid polymer to the second end of the stem includes: dipping the second end of the stem in a liquid polymer; andremoving the second end of the stem from the liquid polymer after the liquid polymer is applied to the second end of the stem. 10. The method of claim 1, further comprising bending the stem relative to the backing layer while molding the liquid polymer on the stem in a mold. 11. The method of claim 10, further comprising bending the stem relative to the backing layer while curing the liquid polymer in the mold. 12. The method of claim 11, wherein bending the stem includes applying a load to the backing layer. 13. The method of claim 11, wherein bending the stem includes bending the stem in a direction away from a perpendicular orientation with the backing layer. 14. The method of claim 1, further comprising: applying a liquid polymer to the second layer stem;inserting a plurality of fibers into the liquid polymer on the second layer stem, wherein the plurality of fibers have a cross-sectional area which is less than a cross-sectional area of the second layer stem; andcuring the liquid polymer on the second layer stem with the plurality of fibers in the liquid polymer. 15. The method of claim 14, wherein the plurality of fibers are nanotubes, nanowires, or nanofibers. 16. The method of claim 1, wherein: the backing layer includes a plurality of stems;applying a liquid polymer includes applying a liquid polymer to the second end of each of the plurality of stems;molding the liquid polymer includes molding the liquid polymer on the plurality of stems, wherein the mold includes a plurality of recesses corresponding to the plurality of stems, and wherein each of the recesses have a cross-sectional area that is less than a cross-sectional area of the second end of the corresponding stem;curing the liquid polymer includes curing the liquid polymer in the mold to form a plurality of tips at the second end of the plurality of stems, wherein the tips includes second layer stems corresponding to the recesses in the mold; andremoving the stems and the tips from the mold after the liquid polymer cures.
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