Photoscience and Spectroscopy Lab
光化学・分光化学・分析化学の研究室
Department of Applied Chemistry, Chuo University

Katayama Group, Chemical Spectroscopy Lab, Department of Applied Chemistry, Chuo University

Welcome to Katayama Group, Chuo University
We have developed various spectroscopic and microscopic techniques to study the mechanism of photo-induced processes. We are trying to control such processes in a small space such as micro-reactors, surfaces or interfaces. Our interests cover photocatalysis, sensitized solar cell, photofunctional liquid crystal and polymer.

中央大学 理工学部 応用化学科 分光化学システム研究室 片山研のホームページへようこそ。
我々は、様々な分光及び顕微手法を開発して、光科学変化の起因を調べています。
マイクロリアクターや表面・界面など小さな空間で起こる光科学変化を制御することを目標にしています。
光触媒反応や増感型太陽電池、光応答性液晶や光硬化性樹脂を研究しています。

News

  • 2018/4/22
    Paper online

    "Surface-dominant and bulk-dominant processes in the phase recovery of liquid crystals" authored by K-I. Nagasaka, W. Y. Sohn, K. Katayama is accepted in
    Molecular Crystals and Liquid Crystals DOI:10.1080/15421406.2018.1468128
    Isotropic to nematic phase change depended on the LC thickness, studied by K-I. Nagasaka

  • Conference Information

    International Meeting on Information Display (IMID 2018) in Busan, Korea, Aug. 28-31, 2018
    Invited Lecture
    The Origin of optical nonlinearity of liquid crystals revealed by transient grating imaging
    K. Katayama

  • Conference Information

    SPIE Optics+Photonics, Liquid Crystals XXII in San Diego, USA, Aug. 19-23, 2018
    Invited Lecture
    Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging
    K. Katayama, Kin-ichiro Nagasaka, Minaka Minagawa, Woon Yoon Sohn

  • Conference Information

    The 40th PIERS in Toyama, Japan, Aug. 1-4, 2018
    Invited Lecture
    Photo-induced Orientation Change of Photo-responsive Liquid Crystals
    K. Katayama


  • Conference Information

    27th International Liquid Crystal Conference in Kyoto, Japan, July. 22-27, 2018
    The origina of optical nonlinearity of liquid crystals revealed by transient grating imaging
    M. Minagawa, K. Nagasaka, W. Y. Sohn, and K. Katayama

    Observation of nonlinear response for dye-doped liquid crystals by using transient grating imaging
    K. Nagasaka, W. Y. Sohn, and K. Katayama


  • Conference Information

    27th PhotoIUPAC in Dublin, Iceland, July. 8-13, 2018
    Uncovering Charge Carrier Dynamics of Hematite Hidden in Nanosecond Range by Transient Grating Technique with Randomly-Interleaved-Pulse-Train Method
    W. Y. Sohn, and K. Katayama

    Comparative study of photo-excited charge carrier dynamics of atomic layer deposited and solution-derived hematite films: dependence of charge carrier kinetics on surface orientations
    M. Inaba, W. Y. Sohn, and K. Katayama


  • Conference Information

    Photonics North 2018 in Montreal, Canada, Jun. 5-7, 2018
    Invited Lecture
    Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging
    K. Katayama


  • Conference Information

    16th Conference of the International Association of Colloid and Interface Scientists in Rotterdam, the Netherlands, May. 21-25, 2018
    Photo-induced motion of liquid crystalline particle including photoactive molecules
    Y. Dogishi, S. Endo, W. Y. Sohn, and K. Katayama

    Facile and quick preparation of colloid crystals by intentionally induced convex flow
    N. Yoshinaga, W. Y. Sohn, and K. Katayama


  • Visitor Information
    h Prof. Francesco Simoni @ Universita' Politecnica delle Marche
    He will visit our group and university and will give three lecture for us.


    With Prof. Simoni and Ikeda
    1st Lecture, 5/10
    "Nonlinear optics of liquid crystals: Basic concepts and observations"

    2nd Lecture, 5/15
    "Nonlinear optics of liquid crystals: Enhanced and nonlinear response and applications"

    3rdLecture, 5/17
    "Optofluidics: optical control and active devices"

    Facile and quick preparation of colloid crystals by intentionally induced convex flow
    N. Yoshinaga, W. Y. Sohn, and K. Katayama


  • Meeting Information

    PRESTO Meeting (さきがけ領域会議) in Ishigaki, Japan, May. 11-13, 2018

    "Evaluation of lifetime and mobility of photo-generated carriers in photo-devices by using modulated-light-induced phase microscopy"
    「変調光位相差顕微鏡による光生成キャリヤ寿命・移動物性評価法」
    K. Katayama

  • 2018/1/5
    Conference Information

    日本化学会第98年会 in Chiba, Mar. 20-23, 2018

    4G1-063, 3/23 9:50-10:00
    物理化学-反応->光化学反応(液相・固相・表面・膜)
    ヘマタイトの表面構造に対する光励起キャリヤダイナミクスの依存性
    ○稲葉 未華・THORNE James. E・WANG Duwei・孫 雲龍・片山 建二

    4G1-04, 3/23 9:30-9:50
    Photochemical Reaction (Liquid, Solid, Surface, and Film)
    Photoexcited Charge Carrier Dynamics of Interconnected TiO2 Nanoparticles: Evidence of Enhancement of Charge Separation at Anatase-Rutile Particle Interfaces
    ○SOHN, Woon Yong; SHINGAI, Daiki; IDE, Yusuke; KATAYAMA, Kenji
    3E3-33, 3/22 14:20-14:40
    物理化学-物性->相平衡・相転移
    過渡格子イメージングを用いた熱応答性高分子の相分離過程の直接観察
    加藤 大騎・孫 雲龍・○片山 建二

  • 2018/3/1
    Intensive Lecture @ VISTEC

    3/15-16 Intensive lectures will be given at VISTEC in Thailand.
     "Photochemistry and its applications for photo-devices"

    Requested seminar will be held.
    "Photo-induced dynamics of photo-devices -Solar cells, photocatalysis, water splitting"

    With Prof. Ogawa and studetns @VISTEC
  • 2018/3/1
    Conference Information

    化学工学会第83年会 in Osaka, Mar. 13-15, 2018

    3/14 13:20-15:20
    化学工学分野におけるスモールスケール実験の開発II
    ○市ノ瀬理沙・船造俊孝・孫 雲龍・片山 建二

  • 2018/1/17
    Paper online
    Collaboration with Prof. Ide @NIMS

    "Photoexcited Charge Carrier Dynamics of Interconnected TiO2 Nanoparticles: Evidence of Enhancement of Charge Separation at Anatase-Rutile Particle Interfaces" authored by Shingai, Daiki; Ide, Yusuke; Sohn, Woon Yong; Katayama, Kenji is accepted in
    Physical Chemistry Chemical Physics, 2018, 20, 3484 - 3489.
    Charge transfer dynamics for enhanced P25 TiO2, studied by D. Shingai and W. H. Sohn
  • 2018/1/18
    Prof. Miura @ Hokkaido Univ visted
    1/18 Lecture on "
     「レーザー誘起単一微粒子に基づく単一分子レベル高感度抽出分析法の探索」
     "Ultrasensitive analysis on a single molecular level based on the extraction using a laser-induced single particle"
    He visited us for the collaboration on the microscopic observation of soft matters, etc.

    With Prof. Miura
  • 2018/1/19
    Paper online

    "Response of liquid crystals in the pre-phase transitional state" authored by K. Katayama, D. Kato, K-I. Nagasaka M. Miyagawa, W. Y. Sohn is accepted in
    Molecular Crystals and Liquid Crystals, 657, 89-94, 2017
    Extremely slow dynamics was observed in LC in the pre-transitional state, studied by D. Kato, K-I. Nagasaka, M. Miyagawa
  • 2018/1/5
    Group introduction 研究室紹介 for 学部生

    We are going to introduce our researches for undergraduates on 1/23, 24 from 2 pm.
    研究室の紹介を1/23(Tue), 24(Wed)の14時から1時間ほど行います。
    Please send me an e-mail indicating your preferred date. 参加希望の方は、希望の日にちをメールにて連絡ください。
    Flyer of the event here.
  • 2018/1/5
    Prof. Ogawa@VISTEC visited lab

    Prof. Ogawa from VISTEC visted our lab to discuss the future collaboration on the photocatalytic materials.
    We agreed that our group members will visit his group in March.

    懇親会 孫さん、宮川さん、小川先生
  • 2017/12/06
    集中講義 Intensive Lecture

    12/8-8 北海道大学で集中講義を行います。
    12/8-8 Intensive lectures will be made at Hokkaido University.
     「光化学の基礎から光機能材料まで」(太陽電池・光触媒)
     "Basics of Photochemistry and Application of photofunctional materials -Solar cells and Phootcatalysis-"
    あわせて、講演も行います。
    Requested seminar will be held.
    「ソフトマターの相変化で何が起こるか? -時間分解法・顕微分光法による観察」
    "What happens during the phase transition of soft matter? -Observation by time-resolved techniques and microscopes"

    北大正門前にて喜多村先生・三浦先生・藤井先生と
  • 2017/12/05
    Paper accepted

    "Formation of photo-responsive liquid crystalline emulsion by using microfluidics device" authored byYoshiharu Dogishi, Shun Endo, Woon Yong Sohn, Kenji Katayama is accepted in
    Entropy, 2017, 19(12), 669 DOI:10.3390/e19120669
    Anomolous defect-pattern change of double emulsions made of LC, studied by Y. Dogishi and S. Endo
Past issue

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