List of Dissertation Abstract
NameSupervisor（Environment and System Sciences

Title

Materials System Course）
Abstract

We observed percolation behavior of nonionic surfactant reverse micelles composed of Span20 andKotokoKenji

ICHIKAWAARAMAKI

Percolation behavior of a reverse
micellar solution using nonionicsurfactants

Tween80 in isopropyl myristate in presence of water and HCl. Abrupt increase of conductivity above 20°C
is an indication of the typical percolation behavior, and the depercolation was observed at high temperature.
The dynamic percolation behavior was suggested based on the scaling analysis of the conductivity changearound the percolation temperature. Small-angle X-ray scattering data showed that reverse micellemicrostructure transition with temperature was correlated with conductive behavior.

Influence of preparation conditionof nonaqueous multicomponent
Naoki

Motoyukislurries with polyethyleneimine

OKAMURAIIJIMA(PEI)–fatty acid complex added on
manufacturing process of Si3N4
ceramics

Silicon nitride (Si3N4) ceramics have excellent properties such as high strength and high toughness.
Therefore, this material is applied as a structural material for bearings and engine parts. Currently, it is
known from the past research that the dispersion and aggregation state of the aqueous slurries greatly
influences the microstructure and microstructure of the sintered body. However, in the process of handling
Si3N4 powder, the use of nonaqueous solvent is required for preventing oxidation of powder.Therefore, thepurpose of this research was to investigate the influence of preparation conditions of multicomponent
nonaqueous slurries on the manufacturing process of Si3N4 ceramics.
We aimed to prepare hydrogel and organogel using food emulsifier. A highly hydrated α-gel can beMiyuki

KenjiOKAMURA

ARAMAKI

Study on hydrogel and organogel

prepared with monoglyceride and sucrose fatty acid ester, and an organogel can be prepared in the same

formed by sucurose fatty acidsystem using squalane as a solvent. Since it is possible to prepare a gel with different viscoelasticity

ester-glycerol fatty acid ester

depending on the amount of sucrose fatty acid ester added, the possibility of preparing a hydrogel and anorganogel suitable for a specific application was shown.
The contact electrification becomes serious problem in taping system such as keeping and conveyance ofContact charging properties ofelectronic components. The Duke-Fabish model is used as a model to explain a contact electrification

Atushi

immiscible binary polymer blends

phenomenon when polymer contact with metal. As a result of confirming the electronic state distributionsSUZUKIand copolymers with various

in polystyrene, an acceptor distribution suggested in the model was really confirmed. We confirmed change

metalsof the electronic state distributions by the composition of polymer blend and copolymer, investigated

Takuma KITAI

correspondence with surface structure, surface composition and relaxation characteristic.

In this work, I reported an electrochemical polymerization in the acoustically prepared foam to obtain
Electrosynthesis of Porous
Yuka Sueyasu

Mahito Atobe

Polypyrrole Materials Using
Acoustically Prepared Foam
Template

polypyrrole (PPy) film with microporous structure on an electrode surface. In this process, ultrasonication
was used to foam the electrolyte solution containing a surfactant and the foamy electrolyte was employed asa soft template for the polymer growth. SEM analysis revealed that the obtained PPy film possessed aporous structure composed of a number of micropores. Since hard templates and cumbersome procedures
are not require for this synthetic method, it is advantageous in respect of environmental and economic
sustainability.
Nanoemulsions are attracting attention in the cosmetics and pharmaceutical industries because of their highKenji
Ryota TAKEI
ARAMAKI

Preparation of nanoemulsion by
PIC method using double-tailed
polyglycerol-type surfactant

stability and functionality. In this study, we prepared nanoemulsions by PIC method using lamellar liquid
crystal (Lα) which was formed by double-tailed polyglycerol-type surfactant (PGDL). By passing throughlamellar liquid crystal during emulsification, nanoemulsions ranging from 30 to 200 nm were obtained.
Moreover, they were stable for more than 50 days at room temperature. In addition, we found that
surfactant-to-oil ratio was an important factor for preparation of nanoemulsion.
The purpose of this study was to develop a new method of hollow particle synthesis that would contributeFabrication of hollow polymer

to green chemistry. In this work, we have developed a simple and novel method for the preparation ofMahito

particles

hollow nanocapsules covered with polypyrrole (PPy) or polyaniline (PANI) using fine bubble soft templates

ATOBE

using acoustically formed fineformed by ultrasonic irradiation. The key features of the method are an effective fine bubble generation bybubble templates

ultrasonication, size reduction of the bubbles by tandem acoustic irradiation, and its application for theAyaka TAJIMA

template synthesis of nano-sized hollow particles.
Effect of surface structure of silicaTakaya

Motoyuki

TSUTSUMI

IIJIMAnanoparticles surface modified
under bead milling process on theproperty of composites with epoxy
resins

Surface modification process to attach epoxy resin on SiO2 nanoparticles through their reaction withpolyethyleneimine (PEI) of PEI-oleic acid complex has successfully conducted with simultaneous beadmilling treatment in toluene. The attachment of epoxy resin found to increase the Tg of epoxy / SiO2composites and their storage modules at temperatures higher than Tg.

We investigated pH responsive demulsification using the amino acid-based gemini surfactant, bis(Nεlauroyl-L-lysin) sebacamide. Its aqueous phase behavior was changed from a transparent micellar solution,
Kenji

pH-responsive emulsions using

spinnability gel, turbid gel and solid deposition depending on pH. Emulsions prepared by using 0.1wt%

ARAMAKI

amino acid-based gemini surfactant

surfactant solution (90wt%) and isopropyl myristate (10wt%) were successfully demulsified by adding 1M

Yuya NAKAI

HCl aq. During this process, the solution pH was changed from 9.5 to 2.0, which could cause solid
desorption of the surfactant molecules adsorbed at the oil-water interface.
Poly(vinyl alcohol) (PVA) hydrogels are hydrophilic, biocompatible materials. PhysicallyNetwork Structures andShunAtsushi

NAKAMURASUZUKI

Mechanical Properties ofPoly(vinyl alcohol) Gels Preparedby Freeze-Thawing Methods :Effects of Freezing Ratecrosslinked PVA gels prepared by a repeated freezing-thawing (FT gel) methods have been
extensively studied for practical applications.In the FT gel, a macroscopic fibrous pattern isobserved in the gel after gelation, which depends on the speed and direction of the freezing
front during freezing of the PVA solution. In addition, it was found that there is a correlation
between the speed of the freezing front and the physical properties such as swelling ratio andmechanical strength.We aimed to investigate the relationship between the microstructure
and physical properties of the respective gel.

Mesoscale Fracture Characteristics

I adopted microcantilever method to evaluate the fracture characteristics near the surface of Si3N4 ceramics

Junichiof Ceramics and Glasses Measured

soaked in molten Al , ion-exchanged glass, densified silica glass. The results revealed that this method canTATAMI

Using Microcantilever Beambe applied to the evaluation of fracture characteristics of various materials and the evaluation of theirSpecimens

strengthening and degradation.

Saho FUJITA

Poly(3-hexylthiophene) (P3HT) has been used in many high-technological applications. However, their

Masatsugu

MahitoMIZUNOATOBEElectrochemical synthesis ofpoly(3-hexylthiophene) using aflow microreactor

synthesis is usually required complicated multi-step processes and toxic transition metal catalysts. On theother hand, the integrated use of microflow technology for organic electrosynthesis would offer one of themost sophisticated processes in organic chemistry. In the present work, we have successfully developed thenovel electrosynthetic system for the preparation of P3HT without its deposition using a flow microreactor.
Molecular weight and its distribution of P3HT could be controlled by selecting the reaction conditions.

Development of Particle
Arrangement Control Methods inSeitaro

Motoyuki

MORITA

IIJIMA

Nonaqueous Dense
Multicomponent Slurries andApplication toward Si3N4 Ceramic
Fabrication Process via PostReaction SinteringSi3N4 ceramics have excellent mechanical properties and thermal properties, which are promising materials
as engineering ceramics. Having a strategy to form complicated shapes by wet processing and to reduce thecost by post-reaction sintering is important to expand Si3N4 ceramic applications. However, the wet
processing requires particle-arranged slurries to obtain suitable green bodies for post-reaction sintering.
Herein we developed a process to control particle arrangement in the slurries based on the design of particle
surface, and applied this process to the Si3N4 manufacturing process via post-reaction sintering technique.
A rotating disk electrode (RDE) which is often used for electeochemical analysis has been applied forElectrosynthesis of Conducting

electrochemical polymerization in order to control structure of the obtained polymer films.

YoshitoMahitoPolymer with Highly-Regulated

With this in mind, the electrochemical polymerization of aniline was carried out at RDE and properties ofYAMADAATOBEStructure Using a Rotating Disk

the obtained films were investigated systematically. As results, the polyaniline films with smooth surface

Electrodecould be obtained by the rotation of RDE. In addition, it was also found that the film density increased withan increase in a rotating speed.
We have successfully demonstrated that a flow micoreactor is extremely useful in controlling reactions

Electrochemical generation of o-involving an unstable o-quinone. This reaction system enables selective oxidation of catechol avoiding theHirona

Mahitoquinone in a flow microreactor andoxidation of reaction partner, although the oxidation potential of reaction partner is close to that of catechol.

YOSHIZAWA

ATOBE

its application to various organicThe examination of several reaction conditions indicated that the key features of the method are an effective

reactiono-quinone generation and its rapid use for the following reaction without decomposition in a flow
microreactor.
The composite material filled with thermal conductive filler as a heat dissipating material
are used as the heat generation amount of electronic equipment increases. The thermal

Fabrication of coarse-equiaxed h-conductive filler is required to be a substance having coarse-spherical shape, high thermal

Takanoki

Junichi

BN particle dispersed resin

conductivity and electric insulating property. In this study, we prepared a composite material

WAKATATATAMI

composite material and thermalof coarse-equiaxed hexagonal boron nitride (h-BN) particles prepared by NH 3 nitriding andconductivity

resin, and clarified the influence on the formability and the thermal conductivity by this hBN particle dispersion. As a result, it was improved that the formability and the thermal
conductivity of the composite material.

I discussed the corrosion behavior of AlN ceramics corroded by CF4/O2 plasma which is used in theplasma etching process of semiconductor making process. In the previous study, there are little data
Kenta

JunichiCorrosion behavior of AlN

WATANABE

TATAMI

ceramics by CF4/O2 plasma.

regarding the corrosion behavior of AlN ceramics considering AlN and secondary phase grains
respectively. Therefore, corrosion behavior of AlN and secondary phase grains in AlN ceramics byCF4/O2 plasma was evaluated. In this study, corrosion depth of these grains was measured
quantitatively. Then, corrosion depth of AlN grains depends on oxygen impurities of AlN grains andthat of secondary phase grains depends on the amount of fluorinated compound.

In white LEDs, phosphor particles dispersed in a resin. The resin is easy to be degraded by heating during
operation to shorten lifetime of the white LEDs. Using transparent and fluorescent bulk ceramics instead ofSayuri

Junichi

Optical properties of yellow

WATANABE

TATAMI

fluorescent Eu doped α-SiAlON

the particle / resin composite are one of the ideas to solve the problem. Eu doped α-SiAlON has beenreported as a yellow phosphor and it has good thermal property. So it’s suitable for application for whiteLEDs. But Eu doped α-SiAlON of bulk ceramics aren’t fabricated and its optical properties aren’t known.
In this study, We fabricated Eu doped α-SiAlON and clarified relation between its optical properties andprocess factors.