井澤 浩則 (イザワ ヒロノリ)

IZAWA hironori

写真a

所属

工学教育研究部 工学科応用物質化学プログラム担当

職名

教授

研究分野 【 表示 / 非表示

  • ナノテク・材料 / 高分子材料

  • ナノテク・材料 / 高分子化学

  • ナノテク・材料 / 生体化学

  • ナノテク・材料 / 機能物性化学

 

論文 【 表示 / 非表示

  • Optimum Preparation Conditions for Highly Individualized Chitin Nanofibers Using Ultrasonic Generator

    Dagmawi Abebe Zewude, Hironori Izawa, Shinsuke Ifuku

    POLYMERS   13 ( 15 )   2021年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI  

    alpha-Chitin derived from crab shells was treated with 30% sodium hydroxide to prepare partially deacetylated chitin with a deacetylation degree of 36%. Partially deacetylated chitin nanofibers were prepared by applying weak ultrasonic energy generated by a domestic ultrasonic cleaner. The deacetylated chitin was easily disintegrated into nanofibers with the aid of electrostatic repulsion and osmotic pressure effect of amino cations on the chitin surfaces. The nanofibers were characterized in terms of yield, morphology, crystallinity, viscosity, and dispersibility. After a series of characterizations, ultrasonication with 45 kHz frequency and 20 min treatment was found to be the optimum conditions for obtaining fine nanofibers with a high yield.

    DOI: 10.3390/polym13152501

    Web of Science

  • Unique Photophysical Properties of 1,8-Naphthalimide Derivatives: Generation of Semi-stable Radical Anion Species by Photo-Induced Electron Transfer from a Carboxy Group 査読あり

    Hironori Izawa, Fumika Yasufuku, Toshiki Nokami, Shinsuke Ifuku, Hiroyuki Saimoto, Toru Matsui, Kenji Morihashi, Masato Sumita

    ACS Omega   6 ( 20 )   13456 - 13465   2021年5月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsomega.1c01685

  • Surface Wrinkles Induced on Oriented Chitosan Films via Horseradish Peroxidase-catalyzed Reaction and Drying 査読あり

    Hironori Izawa, Yuta Toyoshima, Minoru Morimoto, Hiroyuki Saimoto, Shinsuke Ifuku

    Chemistry Letters   50 ( 2 )   252 - 255   2021年2月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Chemical Society of Japan  

    Oriented chitosan films, prepared by elongation, are applied to a surface wrinkling system via a horseradish peroxidase-catalyzed surface reaction of ferulic acid and drying. The wrinkle morphologies of the obtained films are strongly affected by drying compression stress inverse to the elongation direction, probably caused by an entropic spring. The most oriented chitosan film elongated until a fracture strain showed a herringbone-like pattern produced by parallel and orthogonal compression stresses to the orientation direction.

    DOI: 10.1246/cl.200740

    Scopus

  • Highly transparent and flexible surface modified chitin nanofibers reinforced poly (methyl methacrylate) nanocomposites: Mechanical, thermal and optical studies

    Fantahun Aklog Yihun, Shinsuke Ifuku, Hiroyuki Saimoto, Hironori Izawa, Minoru Morimoto

    Polymer   197   122497 - 122497   2020年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.polymer.2020.122497

  • Honeycomb-like porous chitosan films prepared via phase transition of poly(N-isopropylacrylamide) during water evaporation under ambient conditions 査読あり

    H. Izawa, H. Kajimoto, M. Morimoto, H. Saimoto, S. Ifuku

    RSC Advances   10 ( 34 )   19730 - 19735   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    Honeycomb-like porous chitosan (CS) films are attractive tools for developing functional materials for filters, catalyses, adsorbents, biomaterials,etc.A simple method for fabricating honeycomb-like porous CS films without special reagents, facilities, and techniques would make them accessible. Here we introduce an easily available method for fabricating honeycomb-like CS films without a strong acid/base, toxic reagents, or special facilities/techniques. An aqueous solution containing CS and poly(N-isopropylacrylamide) (PNIPAm) was allowed to stand at 25 degrees C to evaporate water. After 3 days, CS-PNIPAm composite films with homogenously phase-separated PNIPAm particles were obtained. The PNIPAm particles were removed by immersion in methanol, and the resulting films dried under reduced pressure to become honeycomb-like porous CS films. The pore size could be varied in the range of 0.5-3.0 mu m by altering the CS concentration and the molecular weight of CS where the pore size was reduced under conditions with stronger interaction between CS molecules. We reveal that the key to success with this system is the decrease of lower critical solution temperature (LCST) of PNIPAm with water evaporation. In addition, we confirmed the removed PNIPAm was recyclable in this system. Furthermore, we found this method was also applicable to alginate. The proposed facile method for fabricating honeycomb-like porous polymeric films could provide various functional porous materials.

    DOI: 10.1039/D0RA03845H

    Web of Science

科研費(文科省・学振・厚労省)獲得実績 【 表示 / 非表示

  • 微細構造表面を誘起するスキン層の科学の開拓

    研究課題/領域番号:19K05616  2019年04月 - 2022年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    井澤 浩則

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    担当区分:研究代表者