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Morphologies and surface properties of cellulose-based activated carbon nanoplates
Seulbee Lee, Min Eui Lee, Min Yeong Song, Se Youn Cho, Young Soo Yun, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 5 32-38 (7 pages)
Specific surface area and chemical composition of CMCC, CCNPs, ACMCC, and ACCNPs Sample SBET (m 2/g) C (at%) O (at%) C/O MCC 1.4 57.9 42.1 1.4 CNPs 1.8 56.3 43.7 1.3 CMCC 265.0 89.8 10.2 8.8 CCNPs 384.3 86.2 13.8 6.3 ACMCC 1166.2 88.8 11.2 7.93 ACCNPs 1310.6 83.4 16.6 5.0 CMCC, pyrolyzed MCC; CCNPs, pyrolyzed CNP; ACMCC, activated CMCC; ACCNPs, activated CCNPs; BET, Brunauer-Emmett-Teller; MCC,... sulfate functional groups introduced during the manufacturing process. In addition, pyrolyzed CNPs (CCNPs) showed more effective chemical activation behavior compared with MCC-induced carbonaceous materials. The activated CCNPs exhibited a microporous carbon structure with a high surface area of 1310.6 m2/g and numerous oxygen heteroatoms. The results of this study show the effects of morphology and the surface properties of cellulose-based nanomaterials on pyrolysis and the activation process. -
Surface Modification by Heat-treatment of Propellant Waste Impregnated ACF
Keun Sig Yoon, Dae Ung Pyo, Young Seak Lee, Seung Kon Ryu, Xiao 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.2 10 131-136 (6 pages)
the surface of modified activated carbon fiber. The porosity, specific surface area, and morphology of those modified ACFs were changed as increasing the heat-treated temperature from 200 to 500 oC. The optimum heat-treatment temperature was suggested to 500 oC, because lower temperature given rise to the decrease of specific surface area and higher temperature resulted in the decrease of weight... -
Validation of Adsorption Efficiency of Activated Carbons through Surface Morphological Characterization Using Scanning Electron Microscopy Technique
Ruchi Malik, Manisha Mujherjee, Aditya Swami, Dilip S. Ramteke, 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2004, Vol.5 No.2 5 75-80 (6 pages)
convinced manner. The adsorptive properties of any activated carbon is highly dependent upon active surface sites incorporating functional groups, specific surface area, particle size, pore volume, pretreatment if any, etc. These factors have remarkable effects on the adsorption capacity and hence play important role in examining the suitability of the adsorbent for a system [1]. The properties of... -
Adsorption Behaviors of Noxious Gases On Chemically Surface-terated Activated Carbons
Soo-Jin Park, Jun-Sik Shin 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2003, Vol.4 No.1 6 31-35 (5 pages)
due to the improvement of basic functional groups, in spite of significant decreases of BET's specific surface area and total pore volume. It was found that the adsorption capacity of ACs was not only deter- mined by the textural characteristics but also correlated with the surface functional groups in the acid-base intermolec- ular interactions. Keywords: adsorption, activated carbons, NO and NH... 20세기는 과학기술 발달이 꾸준히 발전한 시대였으며 이와병행하여 전쟁의 양상 및 무기의 체계에 커다란 혁명을 가져왔다. 특히, 최근 문제가 되고 있으며 가난한 나라의 핵무기로 비유되는 생화학 무기는 값싸게 제작할 수 있고, 이를 소지한 채 잠입하며 살포할 수 있으며, 무색,무취하며 탐지하기가 어렵고, 극미량으로도 인간에게 해를 끼칠 수 있을 뿐 아니라 한번 오염되면 스스로 번식 확산하기 때문에 인류에 막대한 피해를 야기할 수 있어 그 심각성은 일반의 예상을 뛰어 넘는다. -
Effect of Two-step Surface Modification of ACtivated CARbon on the Adsorption Characteristics of Metak Ions in Wastewater I.Equilibrium and Batch Adsorptions
Geun Il Park, Jae Kwang Lee, Seung Kon Ryu, Joon Hyung Kim 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2002, Vol.3 No.4 6 219-225 (7 pages)
ndAC) were evaluated through the BET analysis, surface acidity, and oxides measurements. Specific surface area and pore volume did not significantly change, but surface oxide-group remarkably increased by the surface modification. Equilibrium and batch adsorptions of the various metals, such as Pb, Cd, and Cr, using AC, 1 stAC, and 2 ndAC were performed at initial pH 5. The adsorption capacity and... -
NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group
Mi-Seon Park, Sangmin Lee, Min-Jung Jung, Hyeong Gi Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 3 19-25 (7 pages)
[22]: Fig. 2. (a) N2 adsorption-desorption isotherms and (b) Horvath-Kawazoe (HK) pore size distributions of the pristine activated carbon bers (ACFs) and electron beam-irradiated ACFs. Table 2. BET speci c surface area and porous parameters of the ACFs Sample SBET a) (m 2 g 1) Vt b) (mL g 1) Vmicro c) (mL g 1) Vmeso d) (mL g 1) Dmicro e) (A) A7 659 0.263 0.262 0.001 6.1 A7-H100 460 0.191 0.189... Activated carbon fiber (ACF) surfaces are modified using an electron beam under different aqueous solutions to improve the NO gas sensitivity of a gas sensor based on ACFs. The oxygen functional group on the ACF surface is changed, resulting in an increase of the number of non-carbonyl (-C-O-C-) groups from 32.5% for pristine ACFs to 39.53% and 41.75% for ACFs treated with hydrogen peroxide and potassium hydroxide solutions, respectively. We discover that the NO gas sensitivity of the gas sensor... -
Effect of surface modification of carbon felts on capacitive deionization for desalination
Jong-Ho Lee, Hong-Joo Ahn, Donghwan Cho, Jeong-Il Youn, Young-Jig Kim, Han-Jun Oh 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 4 93-100 (8 pages)
52.1% to 83.3% for KOH modifed, and 45.0% to 65.4% for HNO3 modifed carbon felts, as shown in Fig. 9a and b. carbon felts. This highly responding current may be attributed to the increased BET specifc surface area by the KOH modi- fcation. The responding current on the KOH modifed carbon felt may be explained by the relationship between the conditions leading to the increase of specifc... respectively. The potassium hydroxide (KOH) modified carbon felt exhibited high Brunauer-Emmett-Teller (BET) surface areas and large pore volume, and oxygencontaining functional groups were increased during KOH chemical modification. However, the BET surface area significantly decreased by nitric acid (HNO3) chemical modification due to severe chemical dissolution of the pore structure. The capability of electrosorption by an electrical double-layer and the efficiency of capacitive deionization... -
Role of Angiotensin II and Nitric Oxide in the Rat Paraventricular Nucleus
Eun-KyoungYang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.1 6 41-46 (6 pages)
at room temperature. Det앙mmalons 、ere performed in tiplicate. Non-specific， AT1-Speci섭c， and AT2 specific bindings were investigated in replicate tubes by co-incubation with 1 μM co1d Ang II， 1 μM 10sartan， and 1 μM PD123319， res야ctive1y. Al1 incuba tions were terminated by rapid filtration and washing with ice-cold Tris-HCI using a Brandel cell harvester and Whatan GFjB filters... To investigate the mutual relationship between angiotensin II (Ang II) and nitric oxide (NO) in paraventricular nucleus (PVN), Ang II receptor type Ia (AT1A), type Ib (AT1B), endothelial constitutive nitric oxide synthase (ecNOS), and neuronal constitutive nitric oxide synthase (ncNOS) mRNA levels of rat PVN were measured after unilateral carotid artery ligation. AT1A and AT1B mRNA levels were markedly elevated 6 hrs after unilateral carotid artery ligation. Losartan injection (10μg/0.3μl)... -
Ca2+ -Dependent Exocytosis in Endocine, Exocrine, and Nonsecretory Cells
HaruoKasai 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.1 1 1-7 (7 pages)
the one shown in Fig l. In this new model， three distinct Ca2+ spikes (L-， S-， and M-spikes) are induced in an ag01너st concen tration-dependent manner， with each type of spike triggering specific functions in the cell: The L-spike tiggers the push phase of electrolyte secretion， the S-spike further induces the pull phase (electrolyte uptake) of e1ectrolyte secretion， and the M-spike... -
Two Types of Voltage-dependent Outward Potassium Currents in Smooth Muscle Cells of Rabbit Basilar Atery
TongMookKang, InsukSo, DaeYongUhm, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 15 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1997, Vol.1 No.2 7 169-183 (15 pages)
a valuc of 1 μjcn/ for 얘ccific mcmbranc capacita1CC， thc estimated mean cell surface area ωπe‘ponded to 1.92 xlO ’ cm2. Using these values， the ca1culated speclβc membrane resistance (Rn is abollt 39.2 k입 cm2. Using following cquation， λ (dπJ4κ)”， a spacc constant (A) of 0.153 cm was dctcnnmcd on 디1e basis of the measured cell diameter (d) of 6 j1m and assuming a specific... We have investigated the two types of voltage-dependent outward potassium (K) currents, i.e. delayed rectifier K current (IK(V)) and 'A-like' transient outward K current (Ito) with patch-clamp technique in single smooth muscle cells (SMCs) isolated from rabbit basilar artery, and investigated the characteristics of them. The time-courses of activation were well fitted by exponential function raised to second power (n2) in IK(v) and fourth power (n4) in Ito. The activation, inactivation and...