IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0281768
(2005-11-16)
|
등록번호 |
US-7799423
(2010-10-11)
|
발명자
/ 주소 |
- Majidi, Carmel
- Groff, Richard
- Fearing, Ronald S.
|
출원인 / 주소 |
- The Regents of the University of California
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
17 |
초록
▼
Described herein are fabricated microstructures to adhere in shear to a contact surface. A fabricated microstructure comprises a substrate and a plurality of nano-fibers attached to the substrate. The nano-fibers have an elasticity modulus E, an interfacial energy per unit length of contact w, a len
Described herein are fabricated microstructures to adhere in shear to a contact surface. A fabricated microstructure comprises a substrate and a plurality of nano-fibers attached to the substrate. The nano-fibers have an elasticity modulus E, an interfacial energy per unit length of contact w, a length L, a radius R, and are oriented at an angle θo relative to the substrate. The length L of the nano-fibers is greater than 0.627θoR2(E/w)1/2 with θo in radians. Also described herein is a method of forming a fabricated microstructure to adhere in shear to a contact surface and a method of adhering in shear a fabricated microstructure to a contact surface.
대표청구항
▼
We claim: 1. A fabricated microstructure to adhere in shear to a contact surface, the fabricated microstructure comprising: a substrate; and a plurality of nano-fibers attached to the substrate, wherein the plurality of nano-fibers pack together into one or more clumps of mutually-supporting nano-f
We claim: 1. A fabricated microstructure to adhere in shear to a contact surface, the fabricated microstructure comprising: a substrate; and a plurality of nano-fibers attached to the substrate, wherein the plurality of nano-fibers pack together into one or more clumps of mutually-supporting nano-fibers when not in contact with the contact surface, wherein the clumps break apart when the nano-fibers in the clumps come into contact with the contact surface; wherein the nano-fibers have an elasticity modulus E, an interfacial energy per unit length of contact w, a length L, a radius R, and are biased at an angle θo relative to the substrate when the nano-fibers are not clumped together, wherein the length L of the nano-fibers is greater than 0.627θoR2(E/w)1/2 with θo in radians, and wherein each nano-fiber includes a first end attached to the substrate and a free second end opposite the first end, and wherein a portion of the length of the nano-fibers contact the contact surface. 2. The fabricated microstructure of claim 1, wherein the nano-fibers are disposed on the substrate with a linear spacing greater than 0.188(L/R)2(w/E)1/2. 3. The fabricated microstructure of claim 2, wherein the angle θo is between 0.35 and 1.22 radians, radius R is between 0.025 μm and 1 μm. 4. The fabricated microstructure of claim 3, wherein the length L of the nano-fiber is greater than 5 microns. 5. The fabricated microstructure of claim 1, wherein the plurality of nano-fibers is disposed on the substrate in a square-lattice configuration. 6. The fabricated microstructure of claim 1, wherein a ratio of the length L to the radius R is equal to a ratio of shear force to normal pull-off force. 7. The fabricated microstructure of claim 6, wherein the ratio of the length L to the radius R is greater than 20 to 1. 8. The fabricated microstructure of claim 1, wherein, when the nano-fibers adhere in shear to the contact surface, the nano-fibers bend and adhere along the portion of their length. 9. The fabricated microstructure of claim 1, wherein the nano-fibers are cylindrical. 10. The fabricated microstructure of claim 1, wherein θo is between 0.35 and 1.22 radians, and wherein the nano-fibers are disposed on the substrate with a linear spacing greater than 0.188(L/R)2(w/E)1/2. 11. The fabricated microstructure of claim 1, wherein radius R is between 0.1 μm and 0.3 μm. 12. A fabricated microstructure to adhere in shear to a contact surface, the fabricated microstructure comprising: a substrate; and a plurality of nano-fibers attached to the substrate, wherein the plurality of nano-fibers pack together into one or more clumps of mutually-supporting nano-fibers when not in contact with the contact surface, wherein the clumps break apart when the nano-fibers in the clumps come into contact with the contact surface, wherein the nano-fibers have an elasticity modulus E, an interfacial energy per unit length of contact w, a length L, a radius R, and are biased at an angle θo relative to the substrate when the nano-fibers are not clumped together, wherein θo is between 0.35 and 1.22 radians, wherein the length L of the nano-fibers is greater than 0.627θoR2(E/w)1/2 with θo in radians, wherein each nano-fiber includes a first end attached to the substrate and a free second end opposite the first end, and wherein a portion of the length of the nano-fibers contact the contact surface. 13. The fabricated microstructure of claim 12, wherein the nano-fibers are disposed on the substrate with a linear spacing greater than 0.188(L/R)2(w/E)1/2. 14. The fabricated microstructure of claim 13, wherein, radius R is between 0.025 μm and 1 μm, and wherein the length L of the nano-fiber is greater than 5 microns. 15. The fabricated microstructure of claim 12, wherein the plurality of nano-fibers are disposed on the substrate in a square-lattice configuration.
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