http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Corrosion Protection of Stainless Steel by Double-Layered Oxide Films
Masuda, Masataka,Sakamoto, Hirotoshi,Harada, Kohichiro,Hayashi, Yasunori 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Double-layered oxide films of different pH_pzc (pH for point of zero charge) were deposited on stainless steels using RF magnetron sputtering. Anodic polarization measurements in buffer solutions were employed to evaluate the effect of oxide films on the films. The test solution pH was adjusted between the values of pH_pzc of both oxides, so one oxide had positive surface charge and the other had negative surface charge. The corrosion behaviors of coated steels were affected by the stacking order of oxide films. The higher pitting resistance was obtained for the specimens of stacking lower pH_pzc oxide film as an over layer than an under layer. This was explained by the reason that surface charge of the oxide films affected migration of ions in the corrosive solution. We proposed new method of measuring pH_pzc of oxide film with electrochemical AFM (Atomic Force Microscope). The Coulomb force cause by surface fixed charge was detected with AFM in the test solution. This force was varied with the solution pH, and showed minimum value of pH_pzc of oxide film. We showed the oxide double-layer of suitable staking order enhanced remarkably the corrosion resistance of the stainless steels.
고주영,변수일 한국전기화학회 2004 한국전기화학회지 Vol.7 No.4
A classical Lippmann equation valid for liquid electrodes can not describe the interfacial properties of solid electrodes due to the elastic surface strain on solid electrodes. Although there have been many attempts to derive the thermodynamic equations for solid electrodes during the past a few decades, their validity has been still questioned by many researchers. In practice, although there are various experimental techniques to measure surface energy of solid electrodes, the results obtained by each technique are rather inconsistent due to the complexity of the surface strain on solid electrodes. This article covers these controversial issues in surface energy of solid electrodes. After giving brief summaries of the definition of the important thermodynamic parameters and the derivation of the thermodynamic equations for solid electrodes, the several experimental methods were introduced for the measurement of surface energy of solid electrodes. And then we discussed in detail the inconsistent results in the measurement of the potential of zero charge (pzc) and the potential of electrocapillary maximum (ecm).
Synthesis of a novel carbon nanofiber structure for removal of lead
Hossein Faghihian,Masoume Kooravand,Homa Atarodi 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
A new structure of carbon nanofibers was synthesized by chemical vapor deposition method. Kaolin was used as substrate and cyclohexanol and ferrocene as carbon source and catalyst, respectively. The morphology of the product was studied by scanning electron microscopy. Carbon nanofiber was modified with a mixture of nitric acid and sulfuric acid to enhance its adsorption capacity. The presence of functional groups on the treated adsorbent was assessed by FT-IR spectroscopy. The surface activity of the oxidized sample was estimated by Boehm’s titration. The pH(PZC) of the samples was also measured. The adsorbent was then used for adsorption of Pb2+ at different experimental conditions. The optimized capacity of 211mg·g−1 was obtained. Kinetic and thermodynamic of the reaction were studied. It was concluded that the adsorption process is spontaneous and endothermic. Equilibrium data were well fitted to the Langmuir model and the pseudo-second-order kinetic model described the adsorption process.
Go Joo-Young,Pyun Su-Il The Korean Electrochemical Society 2004 한국전기화학회지 Vol.7 No.4
A classical Lippmann equation valid for liquid electrodes can not describe the interfacial properties of solid electrodes due to the elastic surface strain on solid electrodes. Although there have been many attempts to derive the thermodynamic equations for solid electrodes Outing the past few decades, their validity has been still questioned by many researchers. In practice, although there are various experimental techniques to measure surface energy of solid electrodes, the results obtained by each technique are rather inconsistent due to the complexity of the surface strain on solid electrodes. This article covers these controversial issues in surface energy of solid electrodes. After giving brief summaries of the definition of the important thermodynamic parameters and the derivation of the thermodynamic equations for solid electrodes, the several experimental methods were introduced for the measurement of surface energy of solid electrodes. And then we discussed in detail the inconsistent results in the measurement of the potential of zero charge (pac) and the potential of electrocapillary maximum (ecm).
김지혜(Ji-Hye Kim),이창래(Chang Rae Lee),정용수(Youngsoo Jeong),김양도(Yangdo Kim),김인배(In-Bae Kim) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.3
The pyrolysized carbon xerogel and aerogels were prepared from the sol-gel polymerization of resorcinolformaldehyde(RF) followed by the dry process under ambient pressure and supercritical carbon dioxide condition respectively. The thermal behaviour of RF polymer xerogel was investigated with TGA analyzer to correspond with the pyrolysis process. The surface properties such as particle size, morphology and the point of zero charge of the pyrolysized porous carbon aerogels were studied for the precious metal catalyst supported media. It was found that the volume of the polymer aerogel decreased because of the significant linear shrinkage and weight loss of polymer gel during the carbonization. The point of zero charge of the carbon aerogel pyrolysized at 1050℃ under inert gas flow was about 10.