전체 선택해제
총 65건 검색
본문검색 결과만 보기
-
Thermal Emissivity of Nuclear Graphite as a Function of its Oxidation Degree (3): Structural Study using Scanning Electron Microscope and X-Ray Diffraction
서승국, 노재승, 김석환, 기세환, 김응선 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2011, Vol.12 No.1 2 8-15 (8 pages)
3.38 2.13 252 529 XRD: X-ray diffraction. ..PAGE:7 14 Seung-Kuk Seo et al. / Carbon Letters Vol. 12, No. 1 (2011) 8-15 3.2. X-ray diffraction The XRD patterns following the oxidation degree were achieved as shown in Fig. 8. The XRD pattern of the non- oxidized (0% wt. loss) PCEA could not be obtained due to damage of specimen during keeping. PCEA specimens with 5% and 10% weight loss were examined... -
Real time observation of mouse fetal skeleton using a high resolution X-ray synchrotron
Dong Woo Chang, Bora Kim, Jae Hoon Shin, Young Min Yun, Jung Ho Je, Yeu kuang Hwu, Jung Hee Yoon, Je Kyung Seong 대한수의학회 Journal of Veterinary Science 8 Pages
대한수의학회 Journal of Veterinary Science 2011, 제 12권 제 2호 1 107-114 (8 pages)
used in medicine. Synchrotron radiation has been used for several different techniques, including venous coronary angiography, digitized cerebral synchrotron radiation angiography, monochromatic X-ray computed tomography, monochromatic mammography, two wavelength digital subtraction angiography, phase-contrast/edge- enhancement imaging, diffraction-enhanced imaging, and microtomography, in... A non-monochromatized X-ray synchrotron (white beam, 5C1 beamline) was employed to observe the skeleton of mice under anesthesia at embryonic day (E)12, E14, E15, and E18. At the same time, conventional radiography and mammography were used to compare with X-ray synchrotron. After synchrotron radiation, each mouse was sacrificed and stained with Alizarin red S and Alcian blue to observe bony structures. Synchrotron radiation enabled us to view the mouse fetal skeleton beginning at gestation.... -
Preparation of photoresist-derived carbon micropatterns by proton ion beam lithography and pyrolysis
Hui-Gyun Nam, Jin-Mook Jung, In-Tae Hwang, Junhwa Shin, Chang-Hee Jung, Jae-Hak Choi 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 8 55-61 (7 pages)
structure and composition were investigated by an attenuated total refectance Fourier transform infrared spectrom- etry (ATR-FTIR; 640-IR, Varian, USA) and X-ray photoelectron spectrometry (XPS; K-Alpha+, Thermo Fisher Scientifc, USA) with Al Kα radiation. X-ray diffraction patterns were obtained using an X-ray diffractometer (XRD; D8 Discover, Bruker AXS, Germany) with CuKα radiation in a... Carbon micropatterns (CMs) were fabricated from a negative-type SU-8 photoresist by proton ion beam lithography and pyrolysis. Well-defined negative-type SU-8 micropatterns were formed by proton ion beam lithography at the optimized fluence of 1×1015 ions cm?2 and then pyrolyzed to form CMs. The crosslinked network structures formed by proton irradiation were converted to pseudo-graphitic structures by pyrolysis. The fabricated CMs showed a good electrical conductivity of 1.58×102 S cm?1 and a... -
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)
crystal structures of the GO and rGO powders were analyzed by X-ray diffraction (XRD) and Raman and X- ray photoelectron spectroscopy (XPS). The morphologies of the Fig. 2. Schematic structures of (a) graphene oxide (GO) and GO reduced by (b) hydrazine hydrate, (c) L-ascorbic acid, and (d) gluconic acid. ..PAGE:4 Carbon Letters Vol. 24, 1-9 (2017) DOI: http://dx.doi.org/10.5714/CL.2017.24.001 4... 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... -
Effects of synthesis pressure conditions on the preparation of graphene-like carbonaceous materials from organic liquid precursors by a solvothermal method
Kwan-Woo Kim, Byoung Suhk Kim, Sang Won Lee, Dong Chul Chung, Byung-Joo Kim 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 11 74-78 (5 pages)
a Empyrean X-ray diffractor with a customized auto-mount and a Cu Kα radiation source at 30 kV and 20 mA. Diffraction patterns were collected within diffraction angles from 20 to 80° with a speed of 2°/min. Raman spectroscopy is a very effective method for investigat- ing and determining the precise nanostructures of carbonaceous materials. The measurement area was chosen near to the mark... Carbon materials with at least one dimension of 1?100 nm are called carbon nanomaterials. A significant body of previous research in physics, chemistry and biology has demonstrated that the properties of nano-composites are significantly different than those of the bulk materials [1]. Some unique phenomena, such as the quantum tunneling effect, and surface effects, have also been observed, and attributed to the large surface area and small size of the carbon nanomaterials. It has been reported... -
Electrochemical determination of chloramphenicol using a glassy carbon electrode modified with dendrite-like Fe₃O₄ nanoparticles
Krishnan Giribabu, Sung-Chan Jang, Yuvaraj Haldorai, Muruganantham Rethinasabapathy, Seo Yeong Oh, Arunkumar Rengaraj, Young-Kyu Han 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 6 38-47 (10 pages)
a Nanoscope multimode IVa (Bruker). X-ray diffraction (XRD) patterns were obtained using a Bruker D2 Phaser (Germany) diffractometer with Cu Kα radiation. X-ray photoelectron spectroscopy (XPS) measurements were acquired using a Thermo Scientifc K-Alpha electron spectrometer with an Al X-ray source. 3. Results and Discussion Fig. 1a shows the electrochemical reduction behavior of CAP at... In this study, magnetite (Fe3O4) nanoparticles were electrochemically synthesized in an aqueous electrolyte at a given potential of -1.3 V for 180 s. Scanning electron microscopy revealed that dendrite-like Fe3O4 nanoparticles with a mean size of < 80 nm were electrodeposited on a glassy carbon electrode (GCE). The Fe3O4/GCE was utilized for sensing chloramphenicol (CAP) by cyclic voltammetry and square wave voltammetry. A reduction peak of CAP at the Fe3O4/GCE was observed at 0.62 V, whereas... -
Extraction and characterization of lignin from black liquor and preparation of biomass-based activated carbon therefrom
Daeyeon Kim, Jinsil Cheon, Jeonghoon Kim, Daekyun Hwang, Ikpyo Hong, Oh Hyeong Kwon, Won Ho Park, Donghwan Cho 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 14 81-88 (8 pages)
a preliminary study, carbonization and steam-activation pro- cesses are performed and the obtained activated carbon is char- acterized in terms of thermal stability, X-ray diffraction pattern, morphology, and specifc surface area. ..PAGE:3 Lignin-based activated carbon derived from black liquor 83 http://carbonlett.org specifc surface areas of the carbonized lignin and the activated carbon were... In the present study, biomass-based lignin was extracted from industrial waste black liquor and the extracted lignin was characterized by means of attenuated total reflectance- Fourier transform infrared spectroscopy and 1H-nuclear magnetic resonance spectroscopy. The extracted lignin was carbonized at different temperatures and then activated with steam at 850oC. The extracted lignin in powder state was transformed into a bulky carbonized lignin due to possible fusion between the lignin... -
High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch
Poo Reum Choi, Sang-Gil Kim, Ji Chul Jung, Myung-Soo Kim 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 8 70-80 (11 pages)
obtain the pore volume, pore diameter, and pore size distribution (PSD) of the ACs. Crystal- linity of pristine PP, carbonized PPs, and activated PPs was de- termined by X-ray diffraction (XRD) measurement (XRD-7000; Shimadzu, Japan) using Cu-Kα radiation (λ=1.54056 A) oper- ated at 40 kV and 30 mA. The interlayer spacings (d 002 and d10ℓ) were calculated using the Bragg equation (1). λ=2 d... Activated carbons (ACs) have been used as electrode materials of electric double-layer capacitors (EDLC) due to their high specific surface areas (SSA), stability, and ecological advantages. In order to make high-energy-density ACs for EDLC, petroleum pitch (PP) precarbonized at 500?1000°C in N2 gas for 1 h was used as the electrode material of the EDLC after KOH activation. As the pre-carbonization temperature increased, the SSA, pore volume and gravimetric capacitance tended to decrease, but... -
Thermo-electrical properties of randomly oriented carbon/carbon composite
Thakur Sudesh Kumar Raunija, N. Supriya 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 3 25-35 (11 pages)
weight of the SCM in the compact (g). An X-ray diffraction (XRD) study was conducted using an X-ray diffractometer (Panalytical Xpert Pro MPD, the Nether- ..PAGE:4 Carbon Letters Vol. 22, 25-35 (2017) DOI: http://dx.doi.org/10.5714/CL.2017.22.025 28 tion as per percolation theory. The impact of this is discussed in later sections of the paper. 3.1.2. Density Density as high as 1.64 g/cm 3 was... The aim of the work was to investigate the thermo-electrical properties of low cost and rapidly produced randomly oriented carbon/carbon (C/C) composite. The composite body was fabricated by combining the high-pressure hot-pressing (HP) method with the lowpressure impregnation thermosetting carbonization (ITC) method. After the ITC method step selected samples were graphitized at 3000°C. Detailed characterization of the samples’ physical properties and thermal properties, including thermal...