List of Dissertation Abstract （Environment and System Sciences Materials System Course）
NameSupervisor

Title

Improvement of friction and wear
HirokiAtsushi

characteristics of physically cross-ISHIKAWASUZUKI

linked poly (vinyl alcohol) gel by alaminating method

Abstract

Polyvinyl alcohol (PVA) gel has an excellent water retainable and high biocompatibility. Many studies onapplications, such as artificial cartilage conducted. But we still haven’t had a practical sample. Physicallycross-linking PVA gels has mainly two types. One is freeze and thawing gel (FT gel). The other is cast-dryinggel (CD gel). We aimed at improvement friction and wear property by laminating these two physical crosslinking PVA gels (We call this laminated gel “Hybrid gel”).

Volume resistivity of the Si3N4 ceramics prepared by adding rare earth oxide was investigated. Althoughmany kinds of the Si3N4 ceramics prepared by adding rare earth oxide showed superior electrical insulation
at room temperature, the Si3N4 ceramics prepared by adding Yb2O3 showed low volume resistivity. TheDaisuke

Jyunichi

KAWAITATAMI

Influence of the added rare earth

volume resistivity of the Si3N4 ceramics prepared by adding Yb2O3 decreased with an increase in theoxide on volume resistivity oftemperature and the applied electric field. The volume resistivity of Yb-contained oxynitride glass andSi3N4 ceramics

Yb4Si2O7N2 (J-phase) also decreased in the temperature and the applied electric field. In comparison withdependence of the volume resistivity on the applied electric field, it was shown that J-phase dominated thevolume resistivity of the Si3N4 ceramics. The electrical properties were explained by hopping conductionmechanism due to the coexistence of Yb2+ Yb3+ in J-phase.

Preparation of Mutual Multi-layer
Takahiro

MahitoStructure Composites of Matal andKIMURA

ATOBEConducting Polymer Using
Electrochemical Deposition

We have developed a novel electrical deposition method for preparation of mutual multi-layer structurecomposites of metal and conducting polymer. This new synthetic method involves alternating anodic andcathodic polarizations of a working electrode for mutual deposition of conducting polymer and metal films,
respectively, in a same electrochemical cell. In this work, we have successfully prepared the mutual multilayer structure composites of polypyrrole and nickel by using this method.

An α-type hydrated crystalline phase with sucrose monostearate (C18SE) ,monostearin (MS) andMinamiKenjiKIMURA

ARAMAKI

α-Crystalline Phase Behavior inAqueous System with Sucrose
Monostearate and Monoglyceridemonoorein(MO) was dispersed in an excess amount of water as nanoparticles stabilized with various
deispersants. The most stable lipid nanoparticles can be formulated with sodium caseinate (CN) and they
were kept stable for more than 1 week. DLS measurements showed particle size was around 100 - 200nm
and SAXS measurements showed water content of C18SE dominant and MS+MO-dominant mixing phaseα-type hydrated crystal was 78〜83%.

We successfully prepared electroresponsive structurally colored materials composed of ordered arrays ofpolyaniline@poly(methyl methacrylate) (PANI@PMMA) core-shell nanoparticles. The core-shell

TomoyaMahito

KUNO

Atobe

Preparation and Characterization of
Colloidal Crystals Composed ofCore-Shell Polymer Nanoparticles

nanoparticles were synthesized by deposition of PANI shell on the surfaces of the PMMA cores and then theirordered arrays were fabricated. These core-shell colloidal crystals exhibited colorations resulting from thecombined effects of these materials. The crystal colors depended greatly on the size of PANI@PMMA
particles and could also be varied by the application of an electrical voltage. On the other hand, we also
successfully prepared novel elastic silicone sheets with reversible tuning structural color using
PANI@PMMA core-shell nanoparticles.

Chemical conversion of toluene to methylcyclohexane has been examined to develop an organic hydride

KenMahito

TAKANOATOBEElectrochemical hydrogenation oftoluene and their analogues using aPEM reactor

system. Under this background, we have investigated the electrochemical hydrogenation of toluene using aproton exchange membrane (PEM) reactor. In this work, a PEM reactor, which has been applied to a polymer
electrolyte fuel cell and industrial electrolysis technology, has been developed to improve the electrochemicalhydrogenation of toluene. In addition, the reaction mechanism was estimated from the product distribution in
the electrochemical hydrogenation not only of toluene but also of o-xylene.

It has been reported that Eu doped β-SiAlON is a green emitting fluorescent substance for white light emitting
diodes. In this application, the Eu doped β-SiAlON particles are used to be dispersed in resin. In the resin/βTakehiro

JunichiTranslucency and fluorescence

TANAKATATAMI

give to β-SiAlON ceramics

SiAlON composite LED, deterioration of the resin occurred because of high temperature and ultraviolet
radiation. Translucent fluorescent β-SiAlON ceramics is one of the solutions to solve this problem. In thisstudy, translucent fluorescent β-SiAlON bulk ceramics were fabricated by adding HfO 2 , Y 2 O 3 and SiO 2 as asintering aid. It was confirmed that the developed Eu-doped β-SiAlON ceramics showed translucency andgreen emission.

Nonionic vesicles, which are called niosomes or NSVs, have been the focus of attention as an alternative toNiosome and bicelle formulation of phospholipid liposomes as drug carriers. In this study, novel double-tailed nonionic amphiphiles, polyglyceryl
YoshitomoKenjidouble-tailed polyglycerol

dialkyl ethers can form bilayer structure. In a dilute region, small niosomes of about 80 nm and bicelle ofTSUKIJIMAARAMAKIsurfactants of double-tailed

about 20nm were formulated by ultrasonication, cholesterol addition in this surfactant lamellar phase induced

polyglycerol surfactants

the phase transition to the liquid ordered phase. The niosome with cholesterol was stable at least 100 days
and stable against SDS.

It is important to know thermal expansion of Si 3 N 4 ceramics. Especially, sintering additives influence thermal
YosukeJunichiMUKAITATAMI

Influence of sintering additives onexpansion of Si 3 N 4 ceramics. As a result, it is low thermal expansion to use the sintering additives in small

thermal expansion of Si3N4

atomic weight, short bond distance and strong bond strength without the secondary phase or changing grain

ceramics

boundary glass phase. Using TiO 2 as sintering additives, high thermal expansion was showed because of TiNin the secondary phase.

We change the form of an object by adding power in daily life.The method is various, for example push, pull,
Yasuaki

YoshimiMORIGAKITANAKA

Dynamics of formation of the loop-bend, and twist. We were interested in the shape of the object which we added a twist to. It is difficult totwist transition and the kink in

describe the shape when added a twist to an object exactly. In this study, we study a change of the shape due

elastic-plastic body ribbon

to twist and a kink phenomenon that is one of the problems to happen by adding twists using the elasticplastic body ribbon.

Gels have three-dimensional network structure of polymer cross-linked by chemical or mechanical bonds,
Solvent effect on fracture ofand contain large amount of solvent. Gels are very soft and exhibit non-linear mechanical responses even for

Satoshi

Yoshimihydrogelssmall stresses. Also, their network structure is very sensitive to solvent condition such as temperature, pHYANOTANAKA-Correlation of diffuse dynamics

and ion strength. We have studied coupling effects between non-linear mechanical responses and the solvent

and fracture behavior of gels-condition. We peeled gels under existence of solvents around crack tips and analyzed correlation of peelingspeed and fracture energy. And we found analogy between fracture behavior and diffuse dynamics.

Bicelles are smaller than liposomes and are expected to show greater efficiency in transdermal drug delivery.
Formulating bicelles with low-cost materials and avoiding complicated formulation processes would extend
Yuki

Kenji

Preparation of bicelles using theWatanabe

Aramakisemi-spontaneous method

the application fields of bicelles. In this study, lecithin and Tween80 were dissolved in 1,3-butanediol, andthe mixture was then dispersed in water by ultrasonication. Using this semi-spontaneous method, we obtained
bicelles that were stable up to 180 days. We also obtained bicelles with cholesterol using this method. Thesefindings regarding bicelle formulation with low-cost materials using the semi-spontaneous method are usefulfor the future development of pharmaceutical and cosmetic products.

Wormlike micelle has high viscoelastic. So, wormlike micelle is used in many products such as lubricant,PHAN VU
THUY
NHUNG

The effect of solubilization ofdishwashing liquid. In this study, we research about the effect of pluronic (P123, F127, 25R2, 25R4), oilKENJI

hydrophobic substances on(decane, squalane, cyclohexane), perfume (limonene, p-cymene) as hydrophobic substances on the viscosity

ARAMAKIviscosity coefficient of wormlike

coefficient of wormlike micelle solutions. P123, F127, 25R2, 25R4, decane and squalane decreased themicellar solution

viscosity of wormlike micelle solutions. Cyclohexane, limonene, p-cymene increased the viscosity ofwormlike micelle solutions, then decreased the viscosity of wormlike micelle solutions.