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조을룡 한국기술교육대학교 2006 論文集 Vol.13 No.1
The water-born polyurethane/acrylic emulsion with core-shell morpology was used to develop water-born base coat for automotive coating. Compared to solvent based base coat, water-born base coat showed good water resistance and rust resistance, excellent appearance, and good workability at spray coating. The increase of polyurethane content in hybridized emulsion yielded improvement of adhesion, chip resistance, and film flexibility. The hardness of film with mole ratio of isocyanate group to hydroxy group increased with increasing isocyanate group. In the rheological measurement, unlike solvent based coating, water-born coating resulted in rapid rise of viscosity with increasing shear rate. The range of 3 to 6 of thixotropy index(TI) with use of thickener showed good storage stability and appearance, excellent orientation of color components.
조을룡 한국기술교육대학교 2004 論文集 Vol.10 No.2
Acryl monomers such as acrylic acid(AA), methylmethacrylate(MMA), and ethyl acrylate(EA) were polymerized to use as water reducing agent for cement mortar. Acrylic acid was employed to show good final physical properties with polyoxyethylene aklyphenyl ether(Poly-E) and 2-acrylamido-2-methyl-1-propanesulfonic acid(AMPS). All the polymerizations were carried out in water-based solution to obtain environmentally freindly system. The viscosities of the synthesized solutions for the research have less than 800 cps. Especially, copolymer of AA, MMA, AMPS, and Poly-E resulted in high water retention, low bleeding, good dimensional stability, excellent resistance to freeze-thawing, and high compression strength due to hydrogen bonding of amide group of AMPS and ethylene oxide group of Poly-E.
조을룡 한국기술교육대학교 2006 論文集 Vol.12 No.1
Tint pastes for water-based coatings were formulated and the properties were investigated as water-based coatings is being important due to environmental problems of solvent-based coatings. In the rheological behavior, viscosity of intermediate varies with respect to increased addition of wetting dispersant. The largest viscosity restitution occured at 8% of wetting dispersant when shear stress was removed, and anionic wetting dispersant yielded excellent restitution of viscosity at removal of shear stress. In terms of rheological behavior with pH, we could get the most stable dispersion at pH 8.5. Rheological behavior regarding to amount of dispersing resin showed the most stable pigmented dispersion at 6wt% of it. Particle size of pigment also affected jetness by variation of workability owing to differences of surface area.
Sol-gel based TiO2 paste applied in screen-printed dye-sensitized solar cells and modules
Mateja Hocˇevar,Ursˇa Opara Krasˇovec,Matevzˇ Bokalic,Marko Topic,Welmoed Veurman,Henning Brandt,Andreas Hinsch 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
A simple manufacturing process based on screen-printing is crucial for a successful commercialization of dye-sensitized solar cells (DSSCs). We developed the sol–gel based TiO2 paste in such a way that solely a single step deposition is sufficient to realize a sponge-like structure of the layer assuring its high activity in DSSCs. For the first time the sol–gel based TiO2 paste was screen printed and tested in DSSC masterplates and PV mini-modules. Electroluminescence imaging of the mini-module proved layer homogeneity and no manufacturing defects. The conversion efficiency of the PV mini-module with the active area of 75 cm2 reaches 5.7% at STC.
J. P. Morán-Lázaro,F. López-Urías,E. Muñoz-Sandoval,M. Courel-Piedrahita,A. Carreon-Alvarez,V. M. Rodríguez-Betancourtt,I. Zamudio-Torres,E. S. Guillén-López,A. Palafox-Corona 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
The acetone contained in human breath is of great interest for the health sector as it is a marker that allows to diagnoseand control diabetes in a non-invasive way. However, its concentration is extremely low. Therefore, high-performanceacetone sensors are still a challenge. With this in mind, MgCo 2 O 4 nanoparticles were synthesized using a microwaveassistedcolloidal route with subsequent calcination. Structural and morphological characterizations were done through varioustechniques. The MgCo 2 O 4 sensor was fabricated with the sample calcined at 500 °C. The sensing results showed that thesensor could detect acetone vapors ranging from 0.5 to 50 ppm at an optimum operating temperature of 250 °C with a highresponse, repeatability, stability, and selectivity. These sensing characteristics revealed that MgCo 2 O 4 could be used as a newsensor material to detect acetone in exhaled human breath.
Optical and electrical modelling and characterization of dye-sensitized solar cells
Marko Topič,Andrej Cˇ ampa,Miha Filipic,Marko Berginc,Urša Opara Krašovec,Franc Smole 한국물리학회 2010 Current Applied Physics Vol.10 No.3
A route of optical and electrical modeling of dye-sensitized solar cells (DSSCs) has been developed and validated within a set of test structures. The optical model is based on one-dimensional semi-coherent optical simulator SunShine, in which nanoporous active layer was successfully modelled as effective medium layer with effective scattering of light at its front and back surface interface using effective roughness. The electrical model is based on a pseudo-homogeneous active layer using drift–diffusion transport equations for free electron and ion transport. In both models, input parameters have been extracted from measured performance of test devices and main optical and electrical losses have been quantitatively identified for ionic liquid based DSSC structures, having 7 or 14 lm thick active layer.
N. Arlkan,A.Iyigör,A. Candan,M. Özduran,A. Karakoç,S . U ur4,G. Ugur4,A. Bouhemadou,S. Bin-Omran,N. Guechi 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
Pseudopotential plane-wave method based on density functional theory within the generalized gradientapproximation for the exchange-correlation potential has been applied to study the structural, electronic, elasticand vibrational properties of the binary intermetallic Pd3V and Pt3V in the L12 phase. The optimized latticeconstant, bulk modulus and its pressure derivative, independent single-crystal elastic constants and elasticwave velocities in three different directions are evaluated and compared with the available experimental andtheoretical data. The polycrystalline elastic parameters, hardness coefficient, elastic anisotropy, Debye temperatureare estimated. The electronic band structure, electronic total and partial densities of states, and totalmagnetic moment of the Pd3V and Pt3V alloys are computed and analyzed in comparison with the existingtheoretical and experimental findings. Phonon-dispersion curves and their corresponding total and projecteddensities of states were obtained for the first time using a linear-response in the framework of the densityfunctional perturbation theory.
Thermoelectric Properties of Nano Structured Synthesized by Mechanical Alloying
Ur Soon-Chul,Kwon Joon-Chul,Choi Moon-Kwan,Kweon Soon-Yong,Hong Tae-Whan,Kim Il-Ho,Lee Young-Geun 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Undoped powders were synthesized by mechanical alloying (MA) of elemental powders using a nominal stoichiometric composition. Nano-structured, single-phase skutterudite was successfully produced by vacuum hot pressing (VHP) using MA powders without subsequent annealing. Phase transformations during synthesis were investigated using XRD, and microstructure was observed using SEM and TEM. Thermoelectric properties in terms of Seebeck coefficient, electrical conductivity, thermal conductivity and figure of merit(ZT) were systematically measured and compared with the results of analogous studies. Lattice thermal conductivity was reduced owing to increasing phone scattering in nano-structured MA , leading to enhancement in the thermoelectric figure of merit. MA associated with VHP technique offers an alternative potential processing route for the process of skutterudite.