• School Science Journal
• /
• v.12 no.2
• /
• pp.218-225
• /
• 2018

우리나라 화학 교육과정에서 표면장력은 분자 간 상호작용과 함께 지속적으로 제시되어 온 개념이지만, 지금까지 다뤄진 표면장력은 과학적 정의보다는 단순히 현상이나 사례의 측면으로만 제시되는 경향이 있다. 따라서 본 연구에서는 표면장력에 대한 새로운 교수학습 방법을 마련하고자 과학적 정의에 기반을 둔 표면장력 측정 실험 장치를 개발하고자 하였다. 선행 연구에서 제시한 표면장력 측정 장치들의 한계점을 분석하였고, 실험의 직관성, 편리성, 정확성 등에 초점을 맞추어 Wilhelmy 평판법(Wilhelmy plate method) 기반의 표면장력 측정 장치를 개발하였다. 6종 액체의 표면장력을 측정함으로써 제작된 표면장력 측정 장치가 짧은 시간 내에 정확하고 정밀한 값을 측정할 수 있다는 것을 확인하였다. 본 연구에서 제안하는 표면장력 측정 장치는 추후 화학 수업 현장에서 표면장력 교수와 측정을 위해 사용될 수 있다.

• Korean Journal of Optics and Photonics
• /
• v.15 no.6
• /
• pp.531-538
• /
• 2004

Studies of adsorption isotherms with sharp step-wise layer condensation help us to better understanding of two dimensional layers. For this, an adsorption isotherm apparatus, using a phase modulated ellipsometric technique, has been constructed and an adsorption experiment has been performed. With subatomic scale resolution(∼0.3 $\AA$), the adsorption processes could be observed by ellipsometric signals. On measurement of multilayer adsorption of argon on highly oriented pyrolytic graphite(HOPG), thousands of adsorbed layers were observed at 34.04 K, which suggests that the adsorption is completely wet. On the contrary nine sharp layers of steps for adsorptions and desorptions were observed at 67.05 K. These isotherms obtained can provide a lot of information about thermodynamic states, bonding energies between adsobate and substrate, and structure transitions in the adsorbed film.

• Economic and Environmental Geology
• /
• v.44 no.2
• /
• pp.161-170
• /
• 2011

The multiphase flow simulator, CHEMPS, was developed based on the fractional flow approach reported in the petroleum engineering literature considering fully three phase flow in physically and chemically heterogeneous media. It is a extension of MPS developed by Suk and Yeh (2008) to include the effect of wettability on the migration of NAPL. The fractional flow approach employs water, total liquid saturation and total pressure as the primary variables. Most existing models are limited to two-phase flow and specific boundary conditions when considering physically heterogeneous media. In addition, these models focused mainly on the water-wet media. However, in a real system, variations in wettability between water-wet and oil-wet media often occur. Furthermore, the wetting of porous media by oil can be heterogeneous, or fractional, rather than uniform due to the heterogeneous nature of the subsurface media and the factors that affect the wettability. Therefore, in this study, the chemically heterogeneous media considering fractional wettability as well as physically heterogeneous media were simulated using CHEMPS. In addition, the general boundary conditions were considered to be a combination of two types of boundaries of individual phases, flux-type and Dirichlet type boundaries.