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기능화된 다중벽 탄소나노튜브 복합재료의 제조 및 물성 평가에 대한 연구
박주혁(Joohyuk Park),김태구(Taegoo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Chemically modified multiwalled carbon nanotubes with acids were incorporated into a epoxy matrix by in situ polymerization process, to improve the transfer of mechanical load through chemical bonds, which were demonstrated by infrared spectroscopy. And the mechanical properties of epoxy/carbon nanotube composites were measured to investigate the role of carbon nanotubes. The epoxy/carbon nanotube composites shows higher tensile strength and wear resistance than existing epoxy, with 1 or 2 wt. % addition of functionalized carbon nanotubes. The tensile strength with 7 wt. % carbon nanotibes is increased by a 28% and the wear resistance in exceptionally increased by an outstanding 100 times.
공침법을 통한 나노로드 형태의 니켈계 양극 소재 개발에 관한 연구
박주혁 ( Joohyuk Park ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.2
Ni-rich cathode materials have been developed as the most promising candidates for next-generation cathode materials for lithium-ion batteries because of their high capacity and energy density. In particular, the electrochemical performance of lithium-ion batteries could be enhanced by increasing the contents of nickel ion. However, there are still limitations, such as low structural stability, cation mixing, low capacity retention and poor rate capability. Herein, we have successfully developed the nanorod-type Ni-rich cathode materials by using co-precipitation method. Particularly, the nanorod-type primary particles of LiNi<sub>0.7</sub>Co<sub>0.15</sub>Mn<sub>0.15</sub>O<sub>2</sub> could facilitate the electron transfer because of their longitudinal morphology. Moreover, there were holes at the center of secondary particles, resulting in high permeability of the electrolyte. Lithium-ion batteries using the prepared nanorod-type LiNi<sub>0.7</sub>Co<sub>0.15</sub>Mn<sub>0.15</sub>O<sub>2</sub> achieved highly improved electrochemical performance with a superior rate capability during battery cycling.
다구치 실험 계획법을 이용한 LOM 공정변수의 최적화 연구
박주혁(Joohyuk Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A new composite based material for laminated object manufacturing process (LOM) was introduced<br/> to enhance the dimensional stability and thermo-mechanical properties. The results of an experimental<br/> study are presented and it is focused on the process parameter optimization with this new composite<br/> based material. Material characterization involving thermal and mechanical analysis has been carried out<br/> to provide the process parameter windows. The effect of process parameters on the product quality was<br/> investigated. The bonding strength was selected as the objective through the design of experiment. The<br/> result suggests that the roller speed have the most significant effect on bonding while the roller<br/> temperature has the minimum effect.