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김형진,이갑수,김상식,조진규,강형석,박경북 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.5
The mock-up test was carried out to evaluate applicability of unmanned coating method to prevent asbestos scattering from fiber insulation board in same vibration condition of school. Fiber insulation boards were cut into uniform size and attached in checker figure. Bang machine and rubber hammer were used to scatter asbestos sufficiently. Sodium silicate was used as a asbestos scattering inhibitor. The asbestos concentration was counted by PCM (Phase Contrast Microscope) and TEM (Transmission Electron Microscope). Asbestos concentration was 0.014 (1st day) and 0.021 (14th day) f/cm3, respectively in case of without coating. Asbestos concentration was 0.006 (1st day) and 0.008 (14th day) f/cm3, respectively in case of unmanned coating method. It was satisfied the standard of asbestos concentration in indoor air quality management law. So unmanned coating method was applicable to prevent asbestos scattering from fiber insulation board in buildings.
Enhancement of sensitivity for NO<sub>2</sub> gas sensing using electrospun polymer nanofibers
김형진,홍창국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
In this study, Polypyrrole (PPy) and Poly(3,4-ethylenedioxythiophene) (PEDOT) as conducting polymer were deposited onto surface of quartz crystal microbalance (QCM) using by electrospinning technique for gas sensing. Furthermore, frequency shifts were compared with dip and drop coating method. In dip coating method, QCM electrodes were soaked into each polymeric solution for 10s and dried during 2h. Similarly, prepared PPy and PEDOT solution were drop onto both sides of electrodes and dried for 2h. In electrospinning deposition, PVA mixed with PPy and PEDOT for high viscosity. The feed rate, shear stress and tip and collector distance (TCD) were fixed at 0.2ml/h, 20kV and 12cm, respectively. As a results, electrospun polymer nanofibers coated electrodes show much higher sensitivity than general methods are used.