Method to fabricate asymmetric wrinkles using biaxial strains
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-055/16
B29C-055/02
B29C-055/20
B29C-055/00
B29C-037/00
C23C-014/20
C23C-016/06
B29K-083/00
B29L-009/00
출원번호
US-0382604
(2016-12-17)
등록번호
US-9950462
(2018-04-24)
발명자
/ 주소
Saha, Sourabh Kumar
Culpepper, Martin Luther
출원인 / 주소
Saha, Sourabh Kumar
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
Wrinkling of supported thin films is a strain-driven phenomenon that enables scalable and low-cost fabrication of periodic micro and nano scale structures. The morphology of wrinkles depends on both the magnitude and the nature of compressive strains that are applied to the thin film. This disclosur
Wrinkling of supported thin films is a strain-driven phenomenon that enables scalable and low-cost fabrication of periodic micro and nano scale structures. The morphology of wrinkles depends on both the magnitude and the nature of compressive strains that are applied to the thin film. This disclosure presents the methods to fabricate asymmetric 2-D wrinkled structures using biaxial compressive strains. The method relies on the dependence of wrinkle morphology on both strains and strain paths to generate asymmetric 2D wrinkles. Asymmetry is achieved by deliberately traversing the system through a strain state that creates cracks along a preferential direction. Fabricated patterns include non-uniform zigzag wrinkles that demonstrate period doubling only along one direction.
대표청구항▼
1. A method of making an asymmetric 2-D wrinkle pattern, comprising the steps of: providing a stretchable base substrate;holding the base substrate across a set of clamps, wherein each clamp of the set of clamps holds a corresponding edge of the base substrate;stretching the base substrate along two
1. A method of making an asymmetric 2-D wrinkle pattern, comprising the steps of: providing a stretchable base substrate;holding the base substrate across a set of clamps, wherein each clamp of the set of clamps holds a corresponding edge of the base substrate;stretching the base substrate along two orthogonal axes, thereby forming a biaxially stretched base layer;wherein a bearing allows free movement between each clamp and a stage along a direction parallel to the corresponding edge of the base substrate during the stretchinggenerating a thin film on top of the stretched base layer, thereby forming a composite material comprising a thin film on top of a stretched base layer;releasing the stretch in the stretched base layer of the composite material along a first direction through a sequence of stretching and stretch release steps along the two orthogonal axes, wherein releasing the stretch along the first direction causes the thin film to buckle and generate wrinkles along the first direction and also causes the film to crack along a second direction that is orthogonal to the first direction;further releasing the stretch in the stretched base layer of the composite material along the second direction through a sequence of stretching and stretch release steps along the two orthogonal axes, wherein releasing the stretch along the second direction causes the thin film to buckle along the second direction, thereby forming an asymmetric 2-D wrinkle pattern. 2. The method of claim 1, wherein the asymmetric 2-D wrinkle pattern is a non-uniform zigzag pattern. 3. The method of claim 1, wherein the stretch in the biaxially stretched base layer along the two orthogonal axes are identical. 4. The method of claim 1, wherein the biaxially stretched base layer is formed by first stretching the base substrate along one axis and then stretching the base substrate along the orthogonal axis. 5. The method of claim 1, wherein the biaxially stretched base layer is formed by first stretching the base substrate along a first axis and then stretching the base substrate along a second axis that is orthogonal to the first axis, and wherein the base substrate is held in a manner to freely allow for Poisson's contraction along the second axis during stretching along the first axis. 6. The method of claim 1, wherein the stretch release along the first direction is achieved by a single step of releasing the stretch along the first direction. 7. The method of claim 1, wherein the stretch release along the second direction is achieved by a single step of releasing the stretch along the second direction. 8. The method of claim 1, wherein the stretch along the first direction is partially released. 9. The method of claim 1, wherein the stretch along the second direction is partially released. 10. The method of claim 1, wherein releasing the stretch along the first direction causes the generation of period doubled wrinkles along the first direction. 11. The method of claim 1, wherein releasing the stretch along the second direction causes the generation of period doubled wrinkles along the second direction. 12. The method of claim 1, wherein the period of wrinkles along the first stretch-released direction is higher than the period of wrinkles along the second direction. 13. The method of claim 1, wherein the Poisson's ratio of the top film and the base layer are different. 14. The method of claim 1, wherein there is a mismatch between the elastic moduli of the top film and the base layer with the film being stiffer than the base. 15. The method of claim 1, wherein the thin film is generated on top of the base layer by physical or chemical vapor deposition. 16. The method of claim 1, wherein the thin film is generated on top of the base layer by oxidizing the surface of the base layer. 17. The method of claim 1, wherein the top film is made from a single material. 18. The method of claim 1, wherein the top thin film is titanium. 19. The method of claim 1, wherein the base layer is made from polydimethylsiloxane (PDMS). 20. A method of making an asymmetric 2-D wrinkle pattern, comprising the steps of: providing a stretchable base substrate;holding the base substrate across a set of clamps, wherein each clamp of the set of clamps holds a corresponding edge of the base substrate;stretching the base substrate along two orthogonal axes, thereby forming a biaxially stretched base layer;wherein a bearing allows free movement between each clamp and a stage along a direction parallel to the corresponding edge of the base substrate during the stretchinggenerating a thin film on top of the stretched base layer, thereby forming a composite material comprising a thin film on top of a stretched base layer;releasing the stretch in the stretched base layer along a first direction through a sequence of stretching and stretch release steps along the two orthogonal axes, wherein releasing the stretch along the first direction causes the thin film to buckle and generate wrinkles along the first direction;further releasing the stretch in the stretched base layer along a second direction that is orthogonal to the first direction through a sequence of stretching and stretch release steps along the two orthogonal axes, wherein releasing the stretch along the second direction causes the thin film to buckle along the second direction, thereby forming an asymmetric 2-D wrinkle pattern.
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이 특허에 인용된 특허 (1)
Crosby, Alfred J.; Chan, Edwin P., Surface buckling method and articles formed thereby.
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