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Friction-directed self-assembly of Janus lithographic microgels into anisotropic 2D structures

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    0543218 - ÚOCHB 2022 RIV GB eng J - Journal Article
    Kodakkadan, Y. N. V. - Maslen, C. - Cígler, Petr - Štěpánek, F. - Řehoř, Ivan
    Friction-directed self-assembly of Janus lithographic microgels into anisotropic 2D structures.
    Journal of Materials Chemistry B. Roč. 9, č. 23 (2021), s. 4718-4725. ISSN 2050-750X. E-ISSN 2050-7518
    R&D Projects: GA MŠk(CZ) EF16_019/0000729
    Grant - others:AV ČR(CZ) Fellowship J. E. Purkyně
    Institutional support: RVO:61388963
    Keywords : lubrication * scales * fabrication
    OBOR OECD: Polymer science
    Impact factor: 6.331, year: 2020

    We present a method for creating ordered 2D structures with material anisotropy from self-assembling micro-sized hydrogel particles (microgels). Microgel platelets of polygonal shapes (hexagon, square, and rhombus), obtained by a continuous scalable lithographic process, are suspended in an aqueous environment and sediment on an inclined plane. As a consequence of gravitational pull, they slide over the plane. Each half of the microgel is composed of a different type of hydrogel [poly(N-isopropylacrylamide) (PNIPAM), and poly(ethylene glycol) diacrylate (PEGDA), respectively] which exhibit different frictional coefficients when sheared over a substrate. Hence the microgels self-orientate as they slide, and the side with the lower frictional coefficient positions in the direction of sliding. The self-oriented microgels concentrate at the bottom of the tilted plane. Here they form densely packed structures with translational as well as orientational order.
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