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761.

Study on properties of eco-friendly reduction agents for the reduced graphene oxide method

Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 1 1-9 (9 pages)

Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 저
...
- 3,000원
We studied the basic properties and fabrication of reduced graphene oxide (rGO) prepared using eco-friendly reduction agents in the graphene solution process. Hydrazine is generally used to reduce graphene oxide (GO), which results in polluting emissions as well as fixed nitrogen functional groups on different defects in the graphene sheets. To replace hydrazine, we developed eco-friendly reduction agents with similar or better reducing properties, and selected of them for further analysis. In...
762.

Dispersions of partially reduced graphene oxide in various organic solvents and polymers

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.23 8 55-62 (8 pages)

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 저
...
- 3,000원
We report on the dispersion state of partially reduced graphene oxide (PRGO) in organic solvents, namely methyl ethyl ketone, ethyl acetate, methylene chloride, toluene, and xylene, by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the...
763.

Mechanical and electrical properties of cement paste incorporated with pitch-based carbon fiber

Inkyu Rhee, Jin Hee Kim, Sang Hee Park, Sungho Lee, Bong Ryeul Ryu, Yoong Ahm Kim 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.23 4 22-29 (8 pages)

Inkyu Rhee, Jin Hee Kim, Sang Hee Park, Sungho Lee, Bong Ryeul Ryu, Yoong Ahm Kim 저
...
- 3,000원
The compressive strength and electrical resistance of pitch-based carbon fiber (CF) in cementitious materials are explored to determine the feasibility of its use as a functional material in construction. The most widely used CFs are manufactured from polyacrylonitrile (PAN-based CF). Alternatively, short CFs are obtained in an economical way using pitch as a precursor in a melt-blown process (pitch-based CF), which is cheaper and more eco-friendly method because this pitch-based CF is basically...
764.

Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents

Ho Seok Park, Sung Oong Kang 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2016, Vol.18 4 24-29 (6 pages)

Ho Seok Park, Sung Oong Kang 저
...
- 3,000원
High pollutant-loading capacities (up to 319 times its own weight) are achieved by three-dimensional (3D) macroporous, slightly reduced graphene oxide (srGO) sorbents, which are prepared through ice-templating and consecutive thermal reduction. The reduction of the srGO is readily controlled by heating time under a mild condition (at 1 10?2 Torr and 200°C). The saturated sorption capacity of the hydrophilic srGO sorbent (thermally reduced for 1 h) could not be improved further even though the...
765.

Mechanisms of Na adsorption on graphene and graphene oxide: density functional theory approach

Hye Sook Moon, Ji Hye Lee, Soonchul Kwon, Il Tae Kim, Seung Geol Lee 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.2 7 116-120 (5 pages)

Hye Sook Moon, Ji Hye Lee, Soonchul Kwon, Il Tae Kim, Seung Geol Lee 저
...
- 1,500원
to be stronger than the adsorption of Na on pristine graphene. However, the adsorption of Na on graphene oxide-hydroxyl resulted in the generation of NaOH as a by-product. Using density of states (DOS) calculations, we found that the DOS of the Na-adsorbed graphene was shifted down more than that of the Na-adsorbed graphene oxide-epoxide. In addition, the intensity of the DOS around the Fermi level for the Na-adsorbed graphene was higher than that for the Na-adsorbed graphene oxide-epoxide.
766.

Carbon nanotubes synthesis using diffusion and premixed flame methods: a review

Garima Mittal, Vivek Dhand, Kyong Yop Rhee, Hyeon-Ju Kim and Dong Ho Jung 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 1 1-10 (10 pages)

Garima Mittal, Vivek Dhand, Kyong Yop Rhee, Hyeon-Ju Kim and Dong Ho Jung 저
...
- 3,000원
In recent years, flame synthesis has absorbed a great deal of attention as a combustion method for the production of metal oxide nanoparticles, carbon nanotubes, and other related carbon nanostructures, over the existing conventional methods. Flame synthesis is an energyefficient, scalable, cost-effective, rapid and continuous process, where flame provides the necessary chemical species for the nucleation of carbon structures (feed stock or precursor) and the energy for the production of carbon...
767.

Overlook of current chemical vapor deposition-grown large single-crystal graphene domains

Kyung Tae Park, Taehoon Kim, Chong Rae Park 한국탄소학회 Carbon Letters 11 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.3 1 151-161 (11 pages)

Kyung Tae Park, Taehoon Kim, Chong Rae Park 저
...
- 4,000원
Exceptional progress has been made with chemical vapor deposition (CVD) of graphene in the past few years. Not only has good monolayer growth of graphene been achieved, but large-area synthesis of graphene sheets has been successful too. However, the polycrystalline nature of CVD graphene is hampering further progress as graphene property degrades due to presence of grain boundaries. This review will cover factors that affect nucleation of graphene and how other scientists sought to obtain large...
768.

Removal of Methylene Blue by Modified Carbon Prepared from the Sambucus Nigra L. plant

MahboobehManoochehri, KhadijehAmooei 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.1 4 27-33 (7 pages)

MahboobehManoochehri, KhadijehAmooei 저
- 3,000원
769.

학습을 통한 자아의 재구성: 성인학습자의 고등교육 경험 이해

홍아정 한국성인교육학회 Andragogy Today 34 Pages

한국성인교육학회 Andragogy Today 2009, Vol.12 No.4 8 185-218 (34 pages)

홍아정 저
...
- 6,300원
본 연구는 성인학습자들의 대학입학을 통한 학습경험이 그들의 삶, 특히 자신을 이해하고 재구성하는 과정에 어떠한 영향을 미쳤는지 이해하는데 목적을 두었다. 성인학습자들의 학습경험과 의미를 이해하기 위하여 대학에 입학한 25세 이상의 성 인 14명을 심층 면담하였다. 본 연구는 성인들의 학습참여에 따른 학습의 결과를 도구적 관점으로 분석하려는 의도에서 벗어나 성인학습자들의 주관적 관점을 토대 로 그들이 경험한 대학생활과 자기이해의 변화, 더불어 학습에 대한 그들의 관점의 변화를 이해하는데 초점을 두었다....
770.

개인 지식창출 과정의 개념적 틀

강명희, 고진경 한국기업교육학회 기업교육과 인재연구 30 Pages

한국기업교육학회 기업교육과 인재연구 2002, 제 4권 제 1호 1 5-34 (30 pages)

강명희, 고진경 저
...
- 5,900원
\'지식창출\'은 최근 10 여년간 교육공학 인접분야에서 가장 빈번하게 언급되는 용어임에 틀림없다. 그러함에도 용어의 보편적 정의가 내려지지 않았을 뿐 아니라, 관련 개념에 대한 충분한 논의가 이루어지지 않아 용어 사용과 해석이 모호한 경우가 많다. 특히 학습과 조직을 연구하는 분야에서 \'지식창출\'은 이원적 의미로 사용되어 학습-작업-혁신을 통합하고자 하는 최근 사회의 노력에 걸림돌이 되고 있다. 본 논문은 학교교육과 기업교육에서 통합적으로 적용될 수 있도록 지식창출의 개념을 문헌연구을 통해 재정립함으로써...

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