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Improving the Stability of Chitosan Hydrogel
Hijiri Wadamori,Akihiro Yabuki,Ji Ha Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Chitosan is used in medical materials such as artificial skin and materials for health foods because of its characteristics of being harmless to the human body and highly biocompatible. However, due to its low dispersibility and stability in water. Therefore, in this study, we investigated to enhance the stability of the chitosan gel by adding acidic solvents such as formic acid, acetic acid, phosphoric acid. The concentrations of acidic solvents were controlled under the gel formation process. We also conducted a tensile test to evaluate the tensile strength of the chitosan film at different concentration of acid solvent.
Synthesis of Supercapacitor Electrode by Thermal Decomposition of Manganese Formate Complex
Tomoya Ashida,Akihiro Yabuki,Ji Ha Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The supercapacitor is attracting attention as a high-power, long-life energy storage device capable of rapid charging and discharging. However, their low energy density (Wh/cm³) is an issue. In order to solve this problem, it is necessary to form thin films with high specific capacitance by volume (F/cm³), i.e., three-dimensional thin films. In this study, we attempted to synthesize electrodes for supercapacitors with high energy density by coating and sintering an ink containing manganese formate complexed with amine (TETA) on a porous metal substrate (Ni foam). The sintering temperature was varied from 200 °C to 300 °C, and the mechanism of electrode synthesis was analyzed by examining the difference in the electrode shape and the results of electrochemical measurements.
Tomoyuki Tachibana,Akihiro Yabuki,Ji Ha Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
In general, gels are categorized according by solvents organogel and hydrogel. Recently, it has been classified more precisely such as supramolecular gels, metallogels etc. , depending on the intermolecular interactions as well as solvents. One of the interesting points of the gel chemistry is that the gel behaves either as a solid or as a liquid depending on the conditions for forming the gel. Based on these behaviors, it has been used in various fields such as healthcare, tissue engineering, and cancer therapy. In this research, we introduce polymer gel system using hydrazon reaction between calix[4]arene and stilben derivative. In the prosess of this reaction, we try to load the Doxorubicin hydrochloride(DOX) as the drug for cancer. Frist, we checked the gelation adjusting some factors, heat time, exposing to ultraviolet rays or not, radiation time. Second, characteristic of gels was analyzed by SEM, rheology and so on. Finally, the ratio of drug release was analyzed by immersing gels to the solution using by Uv-vis.
Indra W. Fathona,Akihiro Yabuki 한국물리학회 2014 Current Applied Physics Vol.14 No.5
Short composite nanofibers were fabricated by electrospinning polymer/TiO2 nanoparticle solutions of 13 wt. % cellulose acetate as a polymer under a voltage of 5.5 kV and at a flow rate of 0.1 mL/min, and the nanoparticles could be added in concentrations as high as 50 wt. %. The length of the short composite nanofibers was significantly decreased from 112 to 70 mm by the addition of at least a 5 wt. % concentration of nanoparticles, and it gradually continued to decrease as the nanoparticle concentration was increased. The length of the short composite nanofibers with a low concentration of nanoparticles was affected by the surface charge of the nanoparticles, and negatively charged nanoparticles readily dispersed to the negatively charged polymers in solution, which resulted in an elongation of the fabricated short composite nanofibers.
Self-healing Corrosion Protective Coating Using Nanofibers for Controlled Release of Inhibitor
Yusuke Takimoto,Ji Ha Lee,Akihiro Yabuki 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
In general, the technique to prevent corrosion and corrosion protection is to coat a polymer on the carbon plate. We previously have developed a coating technique that effectively releases corrosion inhibitors by adding the Cellulose nanofibers (CNFs) in the polymer coating. This system have shown the high self-healing properties. In this research, we introduce the coating method which was prepared CNFs at different temperatures to effectively release the corrosion inhibitor.