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이총민 ( Chong Min Lee ),김지웅 ( Ji Woong Kim ),장한권 ( Han Kwon Chang ),노기민 ( Ki Min Roh ),장희동 ( Hee Dong Jang ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.1
Hollow silica particles were prepared using sodium silicate and organic templates. Polystyrene latex (PSL) particles produced by dispersion polymerization were used as organic templates. PSL particles ranged from 1 um to 3 um in diameter were synthesized by adjusting the amount of 2,2`-azobisisobutyronitrile (AIBN). The PSL/SiO2 core-shell particles were prepared by coating of silica nanoparticles originated from sodium silicate using sol-gel method. The organic templates were removed by the organic solvent, tetrahydrofuran (THF). Morphology of hollow silica particles was investigated with respect to types of the reaction medium and pH during the process. By changing the solvent from ethanol to water, hollow silica particles were successfully formed. Hollow silica particles with the uniform shell thickness were produced at low pH as well. The reflectivity of the as-prepared silica particles was measured in the range of the wavelength of UV and visible light. Hollow silica particles showed much better reflective properties than the commercial light reflector, Insuladd.
에어로졸 공정에 의한 Multiwall carbon nanotube/Graphene 복합체 제조 및 슈퍼커패시터 특성평가
조은희,김선경,장한권,이총민,박수련,최지혁,장희동,Jo, Eun Hee,Kim, Sun Kyung,Chang, Hankwon,Lee, Chong Min,Park, Su-Ryeon,Choi, Ji-hyuk,Jang, Hee Dong 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.4
A multiwall carbon nanotube (MWCNT)/graphene (GR) composite was synthesized for an enhanced supercapacitor. Aerosol spray pyrolysis (ASP) was employed to synthesize the MWCNT/GR composites using a colloidal mixture of MWCNT and graphene oxide (GO). The effect of the weight ratio of the MWCNT/GO on the particle properties including the morphology and layered structure were investigated. The morphology of MWCNT/GR composites was generally the shape of a crumpled paper ball, and the average composite size was about $5{\mu}m$. MWCNT were uniformly dispersed in GR sheets and the MWCNT not only increase the basal spacing but also bridge the defects for electron transfer between GR sheets. Thus, it was increasing electrolyte/electrode contact area and facilitating transportation of electrolyte ion and electron in the electrode. Electrochemical data demonstrate that the MWCNT/GR (weight ratio=0.1) composite possesses a specific capacitance of 192 F/g at 0.1 A/g and good rate capability (88% capacity retention at 4 A/g) using two-electrode testing system.