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    A nontransferring dry adhesive with hierarchical polymer nanohairs

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    Type
    Article
    Authors
    Jeong, H. E.
    Lee, J.-K.
    Kim, H. N.
    Moon, S. H.
    Suh, K. Y.
    KAUST Grant Number
    KUK-F1-037-02
    Date
    2009-03-20
    Online Publication Date
    2009-03-20
    Print Publication Date
    2009-04-07
    Permanent link to this record
    http://hdl.handle.net/10754/597351
    
    Metadata
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    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.
    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.
    Publisher
    Proceedings of the National Academy of Sciences
    Journal
    Proceedings of the National Academy of Sciences
    DOI
    10.1073/pnas.0900323106
    PubMed ID
    19304801
    PubMed Central ID
    PMC2667085
    ae974a485f413a2113503eed53cd6c53
    10.1073/pnas.0900323106
    Scopus Count
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