Update: April 12, 2011
Research in this chair is focused
on the analysis of phenomena in particle handling processes and on the development
of the methods for the rational handling of them. Particles are widely used in various
fields and the particle behavior varies complicatedly depending on the
conditions; thus, a full understanding is needed from the viewpoint of the
effective application of fine particles and for environmental protection. In particular, for dry powder systems, i) analysis of dynamic behavior of particles, ii) control
of particle adhesion, and iii) evaluation of the total property including the
effect of static electricity should be investigated.
Electrification of particles
Tribo-electrification of particles is a fundamental phenomenon occurring
in powder handling processes, and the electrostatic force acting on particles
significantly affects the particle behavior. Therefore, the control of the charging
is important for powder handling.
In addition, applications using charged particles have been widely
developed, e.g. electro-photography, dry powder coating, and electrostatic
separation. Since dispersion,
agglomeration, and transport of charged particles can be remotely controlled
using electrostatic force, the development of new applications is expected. To realize it, a correct understanding
of the particle charging, charge distribution control, particle movement
control, and relevant online measurement techniques are required.
(1) Clarification of the mechanism of
particle charging in a steady electric field.
(2) Control of the movement of charged particles under
an unsteady electric field with spatial and temporal variation.
Analysis of the simultaneous transfer of mass and charge in a powder bed.
Development of a high-accuracy measurement system for charge distribution of
Evaluation of Adhesion and flowability of
Particle-particle and particle-wall interaction forces are important
factors directly affecting powder handling, and it is required to develop
appropriate methods for measuring adhesive property between primary particles
and between aggregate particles, and for evaluating the flowability.
(1) Analysis of adhesive strength
distributions in various complex fields.
(2) Analysis of flowability profiles.
Mechanical handling of nano and submicron particles
To produce highly functional products, the demand for using nano and submicron particles is increasing every year. Particle adhesiveness increases with
decreasing particle diameter and powder handling becomes more difficult. In particular, for small particles less
than 1 m in diameter, the problems are serious, and it is urgent to develop new
techniques, as well as to analyze of the particle behavior.
(1) Development of micro-feeder for
nanoparticles using a shear vibration.
(2) Development of a system for particle dispersion
using an ultrasonic vibration and airflow.
Development of a pneumatic transport system for nanoparticles.
Professor: Shuji MATSUSAKA
Technical Expert: Masatoshi YASUDA
Secretary: Harumi YOSHIMOTO