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Study on the Viscosity of Dilute Aqueous Solution
문명준 釜山工業大學校 1988 論文集 Vol.30 No.-
The viscosity of dilute electrolyte solution is affected by the interaction between ions and water molecules as well as the change of the water structrues around the ion. In the significant structrue theory, these interaction energies must be involved in the sublimation energy which need to form the vacancy of molecular size. Viscosities of NaCl, KCl, KBr, and KI solutions are obtained for various temperatures and concentrations. The calculated viscosities in the dilute solution are in good agreements with the experimental data. It is found that the phenomena of structrue making and breaking of water molecules in the first hydration shell of ion must be quantitatively explained in order to understand the viscosities in the dilute aqueous solution.
Analysis of PVDF Coating Properties with Addition of Hydrophobically Modified Fumed Silica
문명준,이남규,김영훈,임태규,이동욱,손민영 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.6
In this study, hydrophobically modified fumed silica was added to the PVDF coating to improve corrosion protection performance. Two types of silane modifiers, trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDZ), were used for hydrophobic modification of the fumed silica. The composition of modified fumed silica was analyzed by Fourier transform infrared, X-ray photoelectron spectroscopy, and elemental analysis. The dispersion of modified fumed silica in the PVDF coating was observed by the transmission electron microscopy, and the hydrophobicity of PVDF coating was analyzed by the water contact angle. Surface properties were examined by the field emission scanning electron microscopy and scanning probe microscopy. Potentiodynamic polarization was conducted to confirm corrosion protection performance of PVDF coating in terms of hydrophobically-modified fumed silica contents. As a result, the average surface roughness and the water contact angle of the PVDF coating increased with modifier contents. The results of the potentiodynamic polarization test showed an increase of the Ecorr values with increase of the hydrophobicity of PVDF coating. Thus, it clearly indicates that the corrosion protection performance of PVDF coating improved with the addition of the hydrophobic-modified fumed silica that prevents the penetration of moisture into the PVDF coating.