FRC Seminar from Hidehiro Kamiya on Nano and Fine Particles

2016-11-10-hidehirokamiya-chbe

The Fluidization Research Centre presents a special seminar by Dr. Hidehiro Kamiya from Tokyo University of Agriculture and Technology:

  • Topic:Nano and Fine particles Aggregation and Adhesion behavior Control for Applications in Various Fields
  • Speaker: Professor Hidehiro Kamiya, Tokyo University of Agriculture and Technology
  • Time & Date: 10:00am-11:00am; November 10, 2016
  • Location: Chemical and Biological Engineering Building Room 202

Abstract

Control of the aggregation, adhesion behavior, and packing/forming of nano/fine particles is important for the large-scale use of these particles in functional materials, fine ceramics, composites, Li ion battery electrodes, drug delivery systems, pigments, toners, cosmetics, and other industrial applications. Surface modification and treatment by using various agents and surfactants with different molecular structures were adopted to control surface interaction among nanoparticles. Optimum surface modification helped in easy dispersion of the nanoparticles in various organic solvents and polymers without aggregation. Various types of surface modification methods will be  introduced for material applications of nano and fine particles. Recently, for new green body forming process, poly-isobutylene-alt-maleic anhydride, which acts as a dispersant and a gelling agent, was adsorbed on alumina fine powder in aqueous suspension. Molecular- and nanometer-scale surface interaction between the particles after surface modification, and time-dependent dispersion and gelation processes, were characterized by using a colloid probe atomic force microscope. Based on surface interactions and the results of molecular-level characterization by FT-IR and other techniques, the mechanism of interaction between the surface-modified molecules and the polymer was discussed to understand and develop functional properties for particle dispersion and gelation.
In the fields of energy and environmental sciences, control of the adhesion and deposition behavior of fine ash and inorganic particles at high temperatures is important for the stable operation of coal, biomass, and solid waste combustion as well as for gasification in power plants and other industrial plants. Two methods for adhesion force
measurement under high-temperature conditions were designed and developed. One method involves direct measurement of the adhesion force between a single particle and the substrate, and the other involves measuring the tensile strength of the powder bed under high-temperature conditions. Based on the results for adhesion behavior and the results of other characterizations such as FE-SEM, TG-DTA, and TMA, the mechanism underlying the increase in adhesion force between the particles was analyzed, and a strategy for controlling the adhesion behavior was discussed. Furthermore, measurement of the actual PM2.5 emission from stationary sources such as power plants and industrial factories is also an important topic of study from the environmental standpoint. A new standard method for the separation and measurement of PM2.5 in flue gas has been introduced.