A nontransferring dry adhesive with hierarchical polymer nanohairs

Handle URI:
http://hdl.handle.net/10754/597351
Title:
A nontransferring dry adhesive with hierarchical polymer nanohairs
Authors:
Jeong, H. E.; Lee, J.-K.; Kim, H. N.; Moon, S. H.; Suh, K. Y.
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 (approximately 26 N/cm(2) in maximum) in the angled direction and easy detachment (approximately 2.2 N/cm(2)) in the opposite direction, with a hysteresis value of approximately 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 microm) 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.
Citation:
Jeong HE, Lee J-K, Kim HN, Moon SH, Suh KY (2009) A nontransferring dry adhesive with hierarchical polymer nanohairs. Proceedings of the National Academy of Sciences 106: 5639–5644. Available: http://dx.doi.org/10.1073/pnas.0900323106.
Publisher:
Proceedings of the National Academy of Sciences
Journal:
Proceedings of the National Academy of Sciences
KAUST Grant Number:
KUK-F1-037-02
Issue Date:
20-Mar-2009
DOI:
10.1073/pnas.0900323106
PubMed ID:
19304801
PubMed Central ID:
PMC2667085
Type:
Article
ISSN:
0027-8424; 1091-6490
Sponsors:
We thank Dr. Khademhosseini for his enthusiastic discussion and comments. This work was supported by the Korea Science and Engineering Foundation through Nano R&D Program Grant 2007-02605, the Micro Thermal System Research Center of Seoul National University, National Research Laboratory Program Grant M10104000095-01J0000-04210, and the Center for Ultramicrochemical Process Systems. This work was also supported in part by King Abdullah University of Science and Technology Program KUK-F1-037-02 and a Korea Research Foundation Grant funded by the Korean Government Ministry of Education and Human Resource Development Grant KRF-J03000.
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Full metadata record

DC FieldValue Language
dc.contributor.authorJeong, H. E.en
dc.contributor.authorLee, J.-K.en
dc.contributor.authorKim, H. N.en
dc.contributor.authorMoon, S. H.en
dc.contributor.authorSuh, K. Y.en
dc.date.accessioned2016-02-25T12:31:20Zen
dc.date.available2016-02-25T12:31:20Zen
dc.date.issued2009-03-20en
dc.identifier.citationJeong HE, Lee J-K, Kim HN, Moon SH, Suh KY (2009) A nontransferring dry adhesive with hierarchical polymer nanohairs. Proceedings of the National Academy of Sciences 106: 5639–5644. Available: http://dx.doi.org/10.1073/pnas.0900323106.en
dc.identifier.issn0027-8424en
dc.identifier.issn1091-6490en
dc.identifier.pmid19304801en
dc.identifier.doi10.1073/pnas.0900323106en
dc.identifier.urihttp://hdl.handle.net/10754/597351en
dc.description.abstractWe 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 (approximately 26 N/cm(2) in maximum) in the angled direction and easy detachment (approximately 2.2 N/cm(2)) in the opposite direction, with a hysteresis value of approximately 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 microm) 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.en
dc.description.sponsorshipWe thank Dr. Khademhosseini for his enthusiastic discussion and comments. This work was supported by the Korea Science and Engineering Foundation through Nano R&D Program Grant 2007-02605, the Micro Thermal System Research Center of Seoul National University, National Research Laboratory Program Grant M10104000095-01J0000-04210, and the Center for Ultramicrochemical Process Systems. This work was also supported in part by King Abdullah University of Science and Technology Program KUK-F1-037-02 and a Korea Research Foundation Grant funded by the Korean Government Ministry of Education and Human Resource Development Grant KRF-J03000.en
dc.publisherProceedings of the National Academy of Sciencesen
dc.subjectAngled etchingen
dc.subjectBiomimeticsen
dc.subjectGeckoen
dc.subjectSlanted nanohair hierarchical nanohairen
dc.titleA nontransferring dry adhesive with hierarchical polymer nanohairsen
dc.typeArticleen
dc.identifier.journalProceedings of the National Academy of Sciencesen
dc.identifier.pmcidPMC2667085en
dc.contributor.institutionSeoul National University, Seoul, South Koreaen
kaust.grant.numberKUK-F1-037-02en

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