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플라즈마 처리에 의한 PMMA, PET, ABS의 초발수 효과
최경린(Gyoung-Rin Choi),노정현(Jung-Hyun Noh),이준희(Jun-Hee Lee),김완두(Wan-Doo Kim),임현의(Hyuneui Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper reports a simple fabrication method for creating the superhydrophobic polymer surface using a plasma etching. Generally, it is necessary for the superhydrophobic surfaces to have a rough structure on surface with the composition of the low surface energy. In this study, Poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), acrylonitrile butadiene styrene (ABS) with superhydrophobic surface were fabricated using O₂ plasma etching and vapor deposition with the fluoroalkylsilane self-assembled monolayers. The plasma treated polymer surfaces are covered with the nano-pillar shaped structures after treatment for 1∼2 min. And these samples with FOTS SAMs coating are showed the superhydrophobicity having the water contact angle of around 150° and sometimes around 180º depending on the treatment time. Furthermore the nanostructured polymer is transparent for the visible light.
Preparation of Manganese/PAN-based Carbon Nanofiber Web by Co-electrospinning
Choi, Gyoung-Rin,Ju, Young-Wan,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
We, in this study, fabricated and applicated MnO₂/carbon fiber nanocomposite web as electrode for supercapacitors prepared by co-electrospinning technique. At first, the PAN-Mn₃O₄ fiber web was prepared by an electrospinning technique to use the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and 5 ~ 20 wt.% manganese oxide hydrate (Mn₃O₄). The electrospun PAN-Mn₃O₄ fiber web was stabilized at 280℃, and then carbon-Mn₃O₄ nanofiber web was carbonized at 1000℃ in the nitrogen atmosphere. The activated carbon/Mn0₂ electrospun fiber web was synthesized by activating at 800℃ in steam atmosphere. The structure of manganese oxide was changed that Mn₃0₄ was changed Mn0₂ during the carbonization and activation of nanocomposite web. The specific capacitance is increased with increasing Mn₃O₄ contents was 15 wt.%. But the specific capacitance is decreased at 20 wt.% Mn₃O₄/carbon nanofiber. The specific capacitances of 5 wt.% Mn₃O₄/carbon, 10 wt.% Mn₃O₄/carbon, 15 wt.% Mn₃O₄/carbon, 20 wt.% Mn₃O₄/carbon and activated carbon nanofiber or nanofiber composite electrode are 170, 230, 260, 175, 140 F/g, respectively at lmA/Cm². In the case of Mn₃O₄ addition, the specific capacitance is improved due to the synergic effect of pseudocapacitance. But the diameter of carbon fiber increased with the contents of Mn₃O₄ is increased. So the electro double layer capacitance is decreased.
Choi, Gyoung-Rin,Ju, Young-Wan,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
The RuO₂/carbon fiber nanocomposite webs were prepared by a co-electrospinning technique in order to use as electrodes of supercapacitor. At first, the PAN-RuO2 fiber web was prepared by an electrospinning technique to use the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and 10 to 20 wt.% ruthenium oxide hydrate (RuO₂). The electrospun PAN-RuO₂ fiber web was stabilized at 280C, and then carbon-RuO₂ nanofiber web was synthesized by activating at 800 C in the steam atmosphere. The specific capacitance is increased with increasing RuO2 contents. But the specific capacitance is decreased at 20 wt.% RuO₂/carbon fiber nanofiber. The specific capacitance of 10 wt.% RuO₂/carbon, 15 wt.% RuO₂/carbon, 20 wt.% RuO₂/carbon and activated carbon nanofiber or nanofiber composite electrode are 365, 461, 390, 140 Fig, respectively at lmA/Cm2. In the case of RuO₂ addition, the specific capacitance is improved due to the synergic effect of pseudocapacitance.
Preparation of Electrode of MWCNT/PAN-Based Carbon Nanofiber Web Coated PPy for a Supercapacitor
Ju, Young-Wan,Choi, Gyoung-Rin,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
At first, the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and multi-walled carbon nanotube (MWCNT) was electrospun so as to make PAN-based nanocomposite fiber web. The electrospun PAN-based carbon nanofiber web was prepared by stabilizing at 280℃, and by activating at 800℃ in stea m atmosphere. Finally, the polypyrrole/MWCNT-carbon nanofiber composite web was prepared by polymerizing pyrrole to use Fecl₃.6H₂O as an oxidant on the carbon-MWCNT nanofiber. The electrodes of (1) bared carbon (2) MWCNT-carbon (3) PPy/carbon (4) PPy/CNT-carbon were prepared for a supercapacitor. Out of the electrodes, the electrochemical performance of 20 wt% polypyrrole /carbon-MWCNT composite nanofiber web electrode was the best as a value of 333F/g. This is because of the synergic effect of non-faradaic and faradaic mechanism.