Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 107, Issue 40, Pages 17095-17100Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1005828107
Keywords
biomimetic; dry adhesion; elastomeric stamp; flexible electronics; microelectromechanical systems
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Funding
- National Security Science and Engineering Faculty Fellowship (NSSEFF)
- Department of Energy [DEFG02-91ER45439]
- Multi-Univeristy Research Initiative (MURI)
- National Science Foundation [DMI-0328162]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [824129] Funding Source: National Science Foundation
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Reversible control of adhesion is an important feature of many desired, existing, and potential systems, including climbing robots, medical tapes, and stamps for transfer printing. We present experimental and theoretical studies of pressure modulated adhesion between flat, stiff objects and elastomeric surfaces with sharp features of surface relief in optimized geometries. Here, the strength of nonspecific adhesion can be switched by more than three orders of magnitude, from strong to weak, in a reversible fashion. Implementing these concepts in advanced stamps for transfer printing enables versatile modes for deterministic assembly of solid materials in micro/nanostructured forms. Demonstrations in printed two- and three-dimensional collections of silicon platelets and membranes illustrate some capabilities. An unusual type of transistor that incorporates a printed gate electrode, an air gap dielectric, and an aligned array of single walled carbon nanotubes provides a device example.
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