List of Dissertation Abstract (Environment and System Sciences
NameSupervisor

Title
Fabrication and Characterization

Takuya ISOSU

Atsushiof Poly(vinyl alcohol) Gels

SUZUKIin Tubular Shape Using
Unidirectional Freezing Method

Materials System Course)
Abstract

One way of preparing poly(vinyl alcohol) (PVA) gels is unidirectional freezing method, and gels
prepared by this method is called unidirectional freeze-thawing gels (UFT gels). UFT gels havefibrous structures in the freezing direction, and it is reported that the tensile strength in the direction
parallel to the fiber is high. In this study, we fabricated UFT tube gels by unidirectional freezing
method and aimed to prepare samples showing the same tensile strength as UFT sheet gels.
When tearing the paper by hand, insert a cut with scissors and pull left and right on the desk. At thistime, the center of the paper buckles. It has been found that when this operation is performed in aYusuke

Yoshimi

Buckling and tearing of elastic

AKAHORITANAKA

thin sheet in low space

space having a height of a few millimeters, buckling is suppressed and a wrinkled pattern isformed. In addition, it is also found that the load required for tearing at this time is significantly
increased as compared to the case without restraint. In this study, we prepared several types of paperwith different thickness for the above phenomenon, and aimed to understand the mechanical andgeometrical mechanism through tearing experiment and numerical analysis.

Formation of Wormlike Micelles
Keita ADACHI

Kenji

by Using Isosorbide Surfactants

ARAMAKIand Effects of Temperature andConcentration on the Solution

Masakazu IKAIAkihiko
ITOIsosorbide is a renewable resource derived from cornstarch, which attracts attention because it has
been applied to as medicines etc. In this study, we used the surfactant sinthesized from isosorbideand tried to make wormlike micelles, which is useful for thickening toiletry, by it. Also, weinvestigated the effects of changing temperature and concentration on the wormlike micellesolution.

Preparation of MgO–MgAl2O4–

Materials in MgO–MgAl2O4–Al2O3 and MgO–SiO2 systems have excellent chemical stability,

Al2O3 and MgO–SiO2

mechanical properties, electrical characteristics and optical properties. In the present study, MgO–

nanocomposite films by metal-MgAl2O4–Al2O3 and MgO–SiO2 nanocomposite films were prepared by metal-organic chemicalorganic chemical vapor

vapor deposition (MOCVD). The effects of deposition conditions on the phase composition,deposition

orientation, and microstructure were investigated.

I measured the fracture characteristics of the constituent elements of SiC and clarified thecorrelation between microstructure factor and fracture properties of SiC. SiC is composed of crystal

Yumi IMOTO

JunichiTATAMIMesoscale fracture properties ofSiC measured by microcantilevermethodgrains, grain boundaries and amorphous phase of μm size, and the fracture properties of these
constituent elements dominate the fracture property of SiC bulk body. In this study, the fracture
characteristics of the constituent elements were actually measured using the microcantilever method
which can measure the fracture characteristics of the desired region. As a result, it was possible tomeasure a value close to the theoretical strength of the component. The correlation between themicrostructure factor and fracture properties could be clarified using the measured strength.

Evaluation of formation ofChikahiro

Kenji

reverse wormlike micelle byIWATA

ARAMAKImeasurement of ionic
conductivity

Surfactants form various self-assembly structures in solution. The one of them is called a reverse
wormlike micelle used as oil thickener. However the cost of formation of it was high and thethickening effect is low. We achieved the formation of the reverse wormlike micelle which solves
the problems. Also we detected the correlation between the viscosity and ionic conductivity ofsolution.
We fabricated the process of porous body controlling hieratical structure which consists of shapes,

Design of inorganic porous bodyAtsushi UGAMotoyuki

using polymer monolith as aIIJIMA

template and its application toplasmonic device

micro- and nano-scale pores and microstructure and applied to high value added plasmonic devices.
Using this process, TiN porous body was fabricated and succeeded in application to photothermal
conversion material for heating water and Surface Enhanced Raman Scattering (SERS) material for
detecting signal of small amount organic matter. TiO2 porous body loaded Ag nanoparticle was alsofabricated in same process and succeeded in application to integrated substrate of SERS sensing
element for detecting signal of low concentration and low amount organic matter.
Yttria (Y2O3) films were prepared by metal-organic chemical vapor deposition (MOCVD). The

Yuya OZAWA

Akihiko ITO

Self-oriented growth of Y2O3

effects of deposition conditions and substrates on film microstructure and orientation werefilms using MOCVD

investigated. Single-crystalline (100) Y2O3 films can be prepared on (100) YSZ substrate at
deposition temperature of 1473 K and total chamber pressure of 0.8 kPa.

Ceramics are prepared by shaping raw material powder and sintering them. Since there is a
Influence of particle
Kenji KAJII

Junichi
TATAMI

accumulation structure ofpowder compacts on sintering
shrinkage behavior of YSZ andporous NiO/GDC

possibility of cracking or deformation during sintering, control of sintering behavior has beenrequired. However, the relationship between the structure of powder compact and sintering behavior
has not been sufficiently elucidated. Therefore, we aimed to elucidate the relationship by fabricating
powder compacts with different structure and comparing sintering behaviors. As a result ofobservation and evaluation of powder compact at the microscale, it became clear that the type andarrangement of the particles in contact with each other in powder compact dominates sintering
shrinkage behavior.
Ceramics is a high-strength material, but the problem is that strength decreases due to the presence

FumikaJunichi

SAKAMOTOTATAMI

Internal structure observation ofof defects. Therefore, the purpose of this research is to perform nondestructive inspection of defects

ceramics by optical coherenceby optical coherence tomography (OCT) which is a novel observation method for predicting thetomographstrength of ceramics and to clarify the phenomena that occurred by operand observation of the~Non destructive

inspection and operandsintering process in which defects become obvious. As a result, the predicted strength based on theobservation of sintering process~ OCT observation agreed with the measured strength. In addition, we could grasp the shrinkage
behavior with sintering quantitatively and understand the change of internal structure.
Organic electrochemical reaction in aqueous electrolyte solutions is a clean and environmentallyElectrochemical properties of
Yuka

MahitoTSUNASHIMA ATOBE

highly concentrated aqueous
electrolyte solutions and theirapplication to organic
electrochemical reactions

friendly process. However, water electrolysis occurs preferentially when electrochemical reaction iscarried out in an aqueous electrolyte. On the other hand, Liumin Suo et al. reported in very recently
that a highly concentrated aqueous electrolyte solutions expanded potential window. Under thesebackgrounds, in this study, we aimed to use this highly concentrated aqueous electrolyte solutions
for organic electrochemical reactions. We have successfully demonstrated that a highly concentrated
aqueous electrolyte is extremely useful for efficient organic electrochemical syntheses and effective
electrochemical detection of bio-relating substances without interference of water electrolysis.

Development of a shaping process of multi-component non-aqueous dense slurry into complexed
Fabrication of Si3N4 ceramics
Kenta

Motoyuki

HASEGAWA

IIJIMAwith complicated structure usingnovel in-situ solidification
process of multi-component nonaqueous dense slurry

structures without forming strong aggregates should open a new window toward fabrication of
Si3N4 ceramics having complicated structures and reliable properties. Herein, we report a novel insitu solidification process of non-aqueous dense slurry stabilized by our originally designed
polymer dispersant; a complex of polyetheleneimine and oleic acid (PEI-OA). A small amountaddition of multi-functional acrylates in this slurry achieved heat induced in-situ solidification byinter-particle crosslinking by Michael additive reaction between free amines of PEI-OA andacrylates.
Poly(vinyl alcohol) hydrogels can be classified by the crosslinking methods into two types ofTakashi HARAAtsushi
SUZUKI

Study of preparation method of
dual crosslinked poly(vinylalcohol) hydrogels

physically crosslinked hydrogels and chemically crosslinked hydrogels. Chemically crosslinked
hydrogels does not elute polymer. Physically crosslinked hydrogels has superior mechanicalstrength as compared with chemically crosslinked hydrogels but shows the polymer elutions. In thisstudy, we investigate the preparation method for making dual crosslinked hydrogels withcharacteristic of both crosslinking methods.

TomohiroHARA

Yb-silicates fiber coating using
Akihiko ITO

metal-organic chemical vapor
deposition

SiC fiber-reinforced ceramic matrix composites (SiC-CMC) is a candidate heat resistant material foraero engines. In the present study, Yb-silicates coatings were prepared on SiC fiber bundle using
metal-organic chemical vapor deposition (MOCVD) for optimizing fiber-matrix interfaces todemonstrate a damage tolerant SiC-CMC.
In this study, anodic cyanation of tetrahydropyran, which is a 6-membered ring ether and has a highMasaki

MahitoHIYAMAATOBE

Anodic substitution reaction ofoxidation potential, was carried out by using a electrochemical flow microreactor. This simple

tetrahydropyran by using a flow

synthetic method enabled to provide a useful 2-cyanotetrahydropyran although its yield was still

microreactor

low. It can be stated that this study offers a new method for synthesis not only of a useful 2cyanotetrahydropyran but also of other substrates which have high oxidation potentials.
A thermal storage material composed of an organic phase change material (PCM) attracts attention.

RyosukeKenjiHORIE

ARAMAKI

Possibility of O/I1 type organic

However, leakage is a problem because organic PCM liquefies above the melting point. Therefore,

phase change material as a

O / I1PCM in which organic PCM is dispersed in cubic liquid crystal (I1 phase) was prepared andthermal storage material

the possibility as a non-fluid type heat storage material is studied.

The semihydrogenation reaction, which converts alkynes to alkenes, is one of the most importantand fundamental reactions in the manufacturing processes of bulk and fine chemicals. The Lindlar
JuriMahito

MINOSHIMAATOBE

Stereoselective Electrochemicalsemihydrogeneation of alkynes is a long-standing synthetic transformation and still remains aSynthesis of Z-Alkenes fromprivileged system. However, it uses toxic Pb additive and a large amount of quinoline. Under thisAlkynes Using a PEM Reactor

background, we investigated the electrochemical hydrogenation of alkynes to Z-alkenes using aproton exchange membrane (PEM) reactor. As a result, we found that product selectivity in thehydrogenation can be controlled by the selection of noble metal catalysts and applied voltage.