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Materials Process Engineering

Academic Staff

Masahiro OHSHIMA

Masahiro OHSHIMAProfessor (Graduate School of Engineering)

Research Topics

Our research interests is to create new products by material processing. To create material products for a specified functions, one has to control nano-micro scale material structure, bulk properties in a certain processing field such as high shear, temperature or pressure fields. Understanding the micro-macro scales relationship between material structure and fields condition is a key of creation. Our research activities focus on elucidation of the relationship and development of a new processing technology for creating new functional materials. One of the research topics is to foams for engineering use.

Contacts

Room 019, Bldg. A4, Katsura Campus
TEL: +81-75-383-2666
FAX: +81-75-383-2646
E-mail: oshima@cheme.kyoto-u.ac.jp

Shinsuke NAGAMINE

Shinsuke NAGAMINEAssociate Professor (Graduate School of Engineering)

Research Topics

My main research topic is the synthesis of porous solids and microparticles with the highly controlled structures and morphologies in nano- or micrometer scale. The novel synthesis technique of inorganic hollow micropaticles based on the liquid-liquid interfacial solid precipitation is currently being developed.

Contacts

Room 019, Bldg. A4, Katsura Campus
TEL: +81-75-383-2686
FAX: +81-75-383-2646
E-mail: nagamine@cheme.kyoto-u.ac.jp

Kenji YOSHIMOTO

Kenji YOSHIMOTOProgram-Specific Associate Professor for E-JUST

Research Topics

My research interests focus on modeling and simulations of self-assembling polymer materials for the next-generation semiconductor manufacturing and the medical applications. Especially in nano technology, simulation can be a very powerful tool for designing new polymer materials and for optimizing the processes.

Contacts

Room 027, Bldg. A4, Katsura Campus
TEL: +81-75-383-7101
FAX: +81-75-383-2646
E-mail: yoshimoto1@cheme.kyoto-u.ac.jp

Yuta HIKIMA

Yuta HIKIMAAssistant Professor (Graduate School of Engineering)

Research Topics

  • Infrared / Near-Infrared Spectroscopic Imaging
  • Polarization Analysis

Contacts

Room 021, Bldg. A4, Katsura Campus
TEL: +81-75-383-2696
FAX: +81-75-383-2646
E-mail: hikima@cheme.kyoto-u.ac.jp

Long WANG

Program-Specific Assistant Professor (Graduate School of Engineering)

Research Topics

Contacts

Introduction to Research

Modern society is deeply indebted to various chemical materials for providing the several products to our life. Among those materials, polymer is one of the materials having the large potentials of giving rise to various functions, such as lightness, flexibility, elasticity, and fluidity. The material functions are strongly related with the material structures in the level from nano, micro to macro-scales. Employing the computer simulation and modern processing machines, our laboratory is developing new material processing technologies for creating new functional materials. Research and development mainly focus on controlling the material structures created by diffusion, phase separation, nucleation and growth and developing the optimal processing device for the control. Integration of supercritical fluid with present plastic processing technologies is one of our interests of our research. Also, material processing in mirco-space, i.e., mirco chemical processes, is our interest. Latest research topics are micro-cellular polymer foaming, nucleation and growth mechanism, mass transfer induced phase separation in drying and crystallization as well as micro-chemical devise developments. Some of them are introduced as follows:

1. Scf CO2 assisted polymer processing

When CO2 dissolves in polymer, polymer is plasticized. That is, viscosity is reduced, glass transition temperature is reduced and several other properties are changed. Taking advantage of these CO2 effects, new polymer-processing schemes, which can realize surface modification, nano-scale pattern transfer on polymer products and CNT infusion to polymer surface, are invented and patented. Fig.1 is a SEM image of Ni layer on a nylon substrate by electroless plating.

Fig6_1
Fig. 1. Ni layer deposited on a polyamide 6 substrate by electroless plating technique. M: NiP, P:polyamide6.

2. Polymeric Foaming

Using CO2 as an environmentally benign foaming agent, thermoplastic polymers are foamed so as to create the micro/nano-cellular structure. Bubble nucleation and growth are phenomena to be analyzed and controlled. Nano-cellular foam was realized in PMMA-b-PS diblock polymer (Fig. 2).

Fig6_2
Fig. 2. Nanocellular foam of PS-b-PMMA.

3. Formation of Self-organized Structure by drying polymeric solutions

Spin-casting of polymer blend solutions sometimes creates peculiar structure (Fig. 3). Formation mechanism of the morphology and its relationships with drying conditions are investigated.

Fig6_3
Fig. 3. An SEM micrograph of PS/PEG 200 (70/30) (w/w) taken tilted at 60°.

Fig. 4 shows a successful preparation of a porous polymeric material, which has uni-directionally aligned channels with bimodal pore size distribution and interconnection to neighboring channels. It was made from a PLA/dioxane solution by a pseudo-steady state freezing and successive freeze-drying processes.

Fig6_4_1
Fig. 4. SEM micrographs of the cross sectional area of PLA: perpendicular to freezing direction.

4. Hollow Nano-fibers by Electrospinning

Hollow nano-fibers of metal oxides are easily prepared by electrospinning a polymer aqueous solution and introducing the thread-like projected solution into the metal alkoxides in organic solvent. The rapid hydrolysis of the alkoxide at the water-oil interface results in the formation of core-sheath structure (Fig. 5).

Fig6_5
Fig. 5. TiO2hollow nano-fibers by electrospinning.