New Physics: Sae Mulli

Aims and Scope

The origin of New Physics: Sae Mulli (NPSM, ISO abbreviation: New Phys.: Sae Mulli.): Sae Mulli (새물리 in Korean characters means ‘new physics’) is the oldest Korean pure scientific journal. It was first published in 1961 just after the Korean War by the Korean Physical Society (KPS). The primary mission of Sae Mulli was to start building up Korean physics research community from almost nothing and in fact Sae Mulli had made tremendous contributions to the Korean science community. Through a peer-review system, Sae Mulli had continued elevating the level of scientific researches, consequently becoming a cornerstone of the economic miracle of Korea...

Editor-in-Chief : Sam Jin KIM
New Physics: Sae Mulli Editorial Board

pISSN : 0374-4914
eISSN : 2289-0041

Tel : +82-2-556-4737
Fax : +82-2-554-1643
E-mail: npsm@npsm-kps.org

Research Papers

Laser-Fabricated Microfluidic Channels Consisting of Hydrophobic and Hydrophilic PMMA

Jin-Ho LEE, Jeong-hyun SEOUNG, Ki-Soo LIM*

Department of Physics, Chungbuk National University, Cheongju 28644, Korea

We report hydrophobic and hydrophilic Polymethylmethacrylate (PMMA) surfaces fabricated by using a femtosecond laser. The treated surfaces were characterized by using water contact angle measurements, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The hydrophobicity of the surface with periodic square arrays of rectangular pillars was assumed to be due to its Cassie−Baxter state. The hydrophilicity of the irradiated flat surface was due to a change in the surface chemical state, not to the Wenzel state. The irradiated surface showed a reduced ratio of the carbon to the oxygen density and an increased hydro-oxide ion band due to surface oxidization and bond-breaking. We fabricated Y-shaped microfluidic channels consisting of hydrophobic and hydrophilic surfaces. Flow rates were observed and analyzed for both channels with different injection rates. We also used a confocal fluorescence microscope to observe the flow with high resolution.

New Phys.: Sae Mulli 2018; 68: 934-938

Measurement of Electrical Conductivity and Dielectric Constant for Various Emission Wavelengths of Quantum-Dots-Doped Nematic Liquid Crystals

Gun Yeup KIM, Chong Hoon KWAK*

Department of Physics, Yeungnam University, Gyeongsan 38541, Korea

We fabricated quantum dot/nematic liquid crystal mixtures (QD-NLCs) with various quantum dot emission wavelengths and measured the electrical resistance and the electrical capacitance as functions of the QD emission wavelength by using the current-voltage characteristic curve and the capacitor method, respectively. By combining the Frank elastic continuum theory and the Maier-Saupe mean field theory, we explicitly present the formulae for the electric resistance and the electric capacitor in terms of the order parameter of the QD-NLCs. Versatile physical parameters, such as the electrical conductivity, dielectric anisotropy constant, Frank elastic constant and quantum dot potential energy, for various quantum dot emission wavelengths are qualitatively estimated from the experimental data by using the proposed theoretical model; Reasonably good agreements are obtained between the measured and predicted results.

New Phys.: Sae Mulli 2018; 68: 844-851

New Phys.: Sae Mulli 2018; 68: 819~938

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Review Paper

Short Review on Fe$_2$O$_3$ Polymorphs and $\varepsilon$-Fe$_2$O$_3$ Thin Films

Heon-Jung KIM*

New Phys.: Sae Mulli 2018; 68: 819-828 https://doi.org/10.3938/NPSM.68.819