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Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
Research Interests
  • Biomimetics
  • Multiscale manufacturing
  • Micro/nanofabrication

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A nontransferring dry adhesive with hierarchical polymer nanohairs

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Title
A nontransferring dry adhesive with hierarchical polymer nanohairs
Other Titles
A nontransferring dry adhesive with hierarchical polymer nanohairs
Author
Jeong, Hoon EuiLee, Jin-KwanKim, Hong NamMoon, Sang HeupSuh, Kahp Y.
Keywords
GECKO FOOT-HAIR; FARADAY CAGE; ASPECT-RATIO; ATTACHMENT SYSTEMS; SURFACES; LITHOGRAPHY; PLASMA; ARRAYS; DEVICES; SILICON
Issue Date
2009-04
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.106, no.14, pp.5639 - 5644
Abstract
We present a simple yet robust method for fabricating angled, hierarchically patterned high-aspect-ratio polymer nanohairs to generate directionally sensitive dry adhesives. The slanted polymeric nanostructures were molded from an etched polySi substrate containing slanted nanoholes. An angled etching technique was developed to fabricate slanted nanoholes with flat tips by inserting an etch-stop layer of silicon dioxide. This unique etching method was equipped with a Faraday cage system to control the ion-incident angles in the conventional plasma etching system. The polymeric nanohairs were fabricated with tailored leaning angles, sizes, tip shapes, and hierarchical structures. As a result of controlled leaning angle and bulged flat top of the nanohairs, the replicated, slanted nanohairs showed excellent directional adhesion, exhibiting strong shear attachment (approximate to 26 N/cm(2) in maximum) in the angled direction and easy detachment (approximate to 2.2 N/cm(2)) in the opposite direction, with a hysteresis value of approximate to 10. In addition to single scale nanohairs, monolithic, micro-nanoscale combined hierarchical hairs were also fabricated by using a 2-step UV-assisted molding technique. These hierarchical nanoscale patterns maintained their adhesive force even on a rough surface (roughness < 20 mu m) because of an increase in the contact area by the enhanced height of hierarchy, whereas simple nanohairs lost their adhesion strength. To demonstrate the potential applications of the adhesive patch, the dry adhesive was used to transport a large-area glass (47.5 x 37.5 cm(2), second-generation TFT-LCD glass), which could replace the current electrostatic transport/holding system with further optimization
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DOI
10.1073/pnas.0900323106
ISSN
0027-8424
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