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Preparation and applications of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric nanoparticle ionogels

  • Original Paper: Sol-gel and hybrid materials with surface modification for applications
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Abstract

Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF–(CH2–CHSi(OMe)3) n –RF; n = 2, 3; RF = CF(CF3)OC3F7: RF–(VM) n –RF] can undergo the sol–gel reaction under alkaline conditions at room temperature to provide the corresponding fluorinated oligomeric silica nanoparticles [RF–(VM–SiO3/2) n –RF]. Silica nanoparticles and tetraethoxysilane are used to the similar sol–gel reaction to prepare the fluoroalkyl end-capped oligomeric silica nanoparticles [RF–(VM–SiO3/2) n –RF/SiO2]. These obtained two types of fluorinated oligomeric silica nanoparticles cannot afford the gel toward water and traditional organic media such as methanol and ethanol; however, interestingly these fluorinated nanoparticles can cause a gelation in a variety of ionic liquids such as phosphonium, ammonium, pyrazolium, and imidazolium salts-type ionic liquids. These fluorinated oligomeric silica nanoparticles/ionic liquid gels (ionogels) were found to provide a similar ionic conductivity to that of the corresponding parent ionic liquids under a variety of temperatures from 25 to 125 °C, and these fluorinated ionogels can keep the similar ionic conductivity even after 10 h at 125 °C. In addition, these fluorinated oligomeric silica/ionogels are applied to the surface modification of PMMA to exhibit not only surface-active characteristic imparted by longer fluoroalkyl groups, but also a good ionic conductivity related to the ionic liquid on the surface. More interestingly, the modified PMMA film can afford the switching behavior from oleophobic to superhydrophilic characteristics derived from the flip-flop motion between the fluoroalkyl groups and the cationic moieties when the environment on the reverse side is changed from oil to water.

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Authors and Affiliations

  1. Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Hirosaki, 036-8561, Japan

    Yoshitaka Sutoh, Taiki Tsuzuki-ishi & Hideo Sawada

  2. Tohoku Chemical Co., Ltd., Hirosaki, 036-8561, Japan

    Yoshitaka Sutoh

  3. Research and Development Division, Nippon Chemical Industrial Co., Ltd., Koto-ku, Tokyo, 136-8515, Japan

    Masashi Sugiya

Authors
  1. Yoshitaka Sutoh
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  2. Taiki Tsuzuki-ishi
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  3. Masashi Sugiya
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  4. Hideo Sawada
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Correspondence to Hideo Sawada.

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Sutoh, Y., Tsuzuki-ishi, T., Sugiya, M. et al. Preparation and applications of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric nanoparticle ionogels. J Sol-Gel Sci Technol 79, 210–219 (2016). https://doi.org/10.1007/s10971-016-4026-z

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  • DOI: https://doi.org/10.1007/s10971-016-4026-z

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