Institute for Materials Chemistry and Engineering, Kyushu University


LAST UPDATE 2017/02/25

  • 研究者氏名
    Researcher Name

    奥村泰志 Yasushi OKUMURA
    准教授 Associate Professor
  • 所属
    Professional Affiliation

    Institute for Materials Chemistry and Engineering, Kyushu University

    Design of Nano-systems, Division of Integrated Materials
  • 研究キーワード
    Research Keywords

    Non-equilibrium Dissipative Systems
    Electroosmotic flow pomp
    Liquid crystal blue phase
    Electro-optical effect
Research Subject
Exploration of non-equilibrium dissipative phenomena in asymmetric soft materials

研究の背景 Background


Ratchet, that is a kind of machine element, is a mechanism for rectifying the reciprocating motion, and are widely used for commutation of the motion of machine, such as gears. On the other hand, a transistor, that is essential in electro circuit, is a ratchet against the motion of electron in a broad sense. Biomolecular motors can also be thought to be ratchets that convert chemical energy to mechanical motion in one direction. Concept of the ratchet has been used widely, but the further expansion of the scope has been expected.

研究の目標 Outcome


We aim to understand rectifying phenomena those are induced by the input of energies or the application of symmetric external fields to the soft materials having asymmetric structures or asymmetric potential profiles. In particular, main objective based on the ratchet concept is electroosmotic flow pump using porous polymeric membranes driven by an alternating electric field without causing electrolysis of water.

研究図Research Figure

Fig.1. Schematic diagram of alternating electric field driving electro-osmotic pump by track-etched membranes with asymmetric zeta potentials. Fig.2. Trajectories of unidirectional translational motion of magnetite particles in a glass cell under alternating magnetic field. Fig.3. Image of (111) plane in liquid crystal blue phase I observed by confocal laser scanning microscope.

文献 / Publications

CHEMPHYSCHEM, 15, 7, 1447-1451, (2014). J. Mater. Chem. C, 2, 6467-6470 (2014).