Hybridization of chemically modified cellulose and hydroxyapatite applicable to tough biomass materials

15:00-15:15

【Profile】

My name is Natsuki Okuda and I am from Doshisha University, Kyotanabe Campus. My research is to composite various polysaccharides with hydroxyapatite, the main inorganic component of bone, by mimicking the nanostructure of bones, teeth, and shells, in order to develop materials that are friendly to humans and the environment and have excellent mechanical properties. I love research very much. I am looking forward to meeting you all at the conference. Thank you very much for your cooperation.

【Abstract】

The composite of hydroxyapatite (HAP) and carboxymethyl cellulose (CMC) was synthesized by a coprecipitation process with the aim of developing a new tough biomass material by imitating bone. HAP was crystallized at 50 °C in aqueous CMC solution of 0.8~13.2 g/L. The crystal structure of HAP in the composites were confirmed by X-ray diffraction. It was found that the crystal growth of HAP in the a-plane direction was most suppressed at CMC concentration of 9.9 g/L, and the binding of the carboxy groups of CMC and the a-plane of HAP was retained. Furthermore, the mechanical properties of the composites were confirmed by three-point bending test. At CMC concentration of 9.9 g/L, the bending strength and elastic modulus were 113 MPa and 7.7 GPa, respectively, which are comparable to the bending strength of polyamide 6 and the elastic modulus of polyamide 66 with 40 wt% glass fiber. It is expected to be used as a new tough biomass material to replace petroleum-based engineering plastics.

Semiconducting/metallic carbon nanotube liquids and large-area and uniform carbon nanotube film

15:15-15:30

Application of Spectrum Super-resolution to industry

15:30-15:45

ZnO-based Antibacterial materials, and the state-of-the art technology to generate and irradiate negatively charged oxygen ions to tailor the properties of metals and oxide semiconductors

16:00-16:15

【Profile】

Prof. Yamamoto’s area of expertise is in the condensed matter physics, film growth technology, the development of film growth apparatus, solid state crystallization, characterization, and first-principles calculation of wide-band-gap semiconductors such as ZnO, In2O3, GaN, AlN. He proposes a concept for the governing factors that induce oxide-specific function generation, and develop his own idea such as codoping to achieve tailored functional oxide films. The applications include as follows: light emitting diodes in the ultraviolet wavelength region, highly transparent conductive oxides electrodes for use in flat panel display; LCD TV and in solar cells; IR-plasmonic applications; H2 sensors; antibacterial materials. Several R&D being collaborated with different types of industries have been under progress since 1999. Many products and apparatus with patents co-developed with companies have been already commercial. There are numbers of more than 60 oxide-semiconductors-related patent applications and there are many registered international patents. He is an editorial board member of Ceramic in Modern Technologies. He has been the supervisor of many National Projects in Japan.

【Abstract】

The antibacterial function is due in part to the destruction of bacterial cell membranes by activated oxygen produced in the vicinity of metal oxides. Zinc has been found to have antimicrobial properties similar to those of copper and silver. To enhance the above properties, success factors include the use of zinc oxide, especially in thin film form. It is noted that the effect of generating activated oxygen has been controlled without the need for energy load such as light.
Oxygen atoms have high oxygen affinity, Through industry-academia collaboration, we have commercialized an apparatus that produces negative oxygen ions and irradiates them onto semiconductors and ceramics to tailor their properties. As an example of our research results, we introduce the characteristics Cu2O layer/Cu plate obtained by irradiating oxygen-free copper plates with negative oxygen ions without intentionally heating of Cu substrates, from the viewpoint of the observed optical interference.

Innovation in post lithium-ion batteries

16:15-16:30