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전체 선택해제
총 313건 검색
본문검색 결과만 보기
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A Study on a New Method of Measurement of Pore Volume Distribution in Porous Materials by Adsorption of Gases
Lee. Jo-Woong, Chang. Sei-Hun, Choo. Kwang-Yul, Yoon. Jae-Shin, Chung. Won-il 대한화학회 Bulletin of the Korean Chemical Society 6 Pages
대한화학회 Bulletin of the Korean Chemical Society 1987, Vol.8 No.3 150-155 (6 pages)
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Effect of Curvature Dependency of Surface Tension on the Result of Pore-Volume Distribution Analysis
조창현, 안운선, 장세헌, Cho. Chang-Hyun, Ahn. Woon-Sun, Chang. Seihun 대한화학회 대한화학회지 8 Pages
대한화학회 대한화학회지 1972, Vol.16 No.6 341-348 (8 pages)
질소의 흡착 등온곡선을 이용하여 흡착체의 동공부피 분포를 계산하는 과정에서 표면장력의 곡률 의존도 고려 효과를 조사하였다. 즉, 장세헌 등에 의한 표면장력의 곡률 의존도식과 캘빈 식으로부터 주어진 압력에서의 캘빈반경을 구하고, 이것으로부터 흡착체의 동공부피 분포를 계산하였다. 이와 같이하여 얻은 계산 결과를 표면장력의 곡률 의존도를 고려하지 아니한 종래방법에 의한 계산 결과와 비교하였다. 일반적으로 곡률 의존도를 고려해주면 동공부피 분포 곡선의 극대부분이 큰 동공 쪽으로 이동한다. 또한 모세관 응축이... -
CO2 adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity
Mi-Seon Park, Si-Eun Lee, Min Il Kim and Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.1 7 45-50 (6 pages)
indicate that pitch-based cokes prepared under high temperature and pressure have a high crystal structure. The textural properties of hc-AC indicate that it consists mainly of slit-like pores. Compared to other textural forms of AC that have higher pore volumes, this slit-poreshaped hc-AC exhibits higher CO2 adsorption due to the similar shape between its pores and CO2 molecules. Additionally, in these high-crystallinity cokes, the main factor affecting CO2 adsorption at lower temperature is th... -
Preparation of novolac-type phenol-based activated carbon with a hierarchical pore structure and its electric double-layer capacitor performance
Dayoung Lee, Jin-Young Jung, Mi-Seon Park, Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 6 192-197 (6 pages)
hierarchical pore structured novolac-type phenol based-activated carbon with micropores and mesopores was fabricated. Physical activation using a sacrificial silicon dioxide (SiO2) template and chemical activation using potassium hydroxide (KOH) were employed to prepare these materials. The morphology of the well-developed pore structure was characterized using field-emission scanning electron microscopy. The novolac-type phenol-based activated carbon retained hierarchical pores (micropores and... -
Effects of carbonization temperature on pore development in polyacrylonitrile-based activated carbon nanofibers
Hye-Min Lee, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 13 146-150 (5 pages)
In this work, activated carbon nanofiber (ACNF) electrodes with high double-layer capacitance and good rate capability were prepared from polyacrylonitrile nanofibers by optimizing the carbonization temperature prior to H2O activation. The morphology of the ACNFs was observed by scanning electron microscopy. The elemental composition was determined by analysis of X-ray photoelectron spectroscopy. N2-adsorption-isotherm characteristics at 77 K were confirmed by Brunauer-Emmett-Teller and... -
Effects of pore structures on electrochemical behaviors of polyacrylonitrile-based activated carbon nanofibers by carbon dioxide activation
Hye-Min Lee, Hong-Gun Kim, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 10 71-76 (6 pages)
and Dubinin-Radushkevich equations. As experimental results, many holes or cavernous structures were found on the fiber surfaces after the CO2 activation as confirmed by scanning electron microscopy analysis. Specific surface areas and pore volumes of the prepared ACNFs were enhanced within a range of 10 to 30 min of activation times. Performance of the porous PAN-based nanofibers as an electrode for electrical double layer capacitors was evaluated in terms of the activation conditions.
