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Binding Energy of Oxigen and Methane Adsorbed on Bundles of Open-Ended Single-Wall Carbon Nanotubes
서주연,유대황,곽진성,황윤회,김형국 부산대학교 유전체물성연구소 2004 유전체 논문집 Vol.3 No.
The adsorption of oxygen and methane on the bundles of open-ended single wall carbon nanotube(SWNT) was studied using the volumetric adsorption qst was obtained from the adsorption isotherm measurements performed at different temperatures. The trend in the values of the methane isosteric heat of adsorption showed three regions, representative of the adsorption on the different types of adsorption sites. In case of oxygen, on the other hand, such distinguishable regions were not appeared in the N-qst graph. From the results of qst the binding energies of oxygen and methane adsorbed on open-ended SWITs were estimated.
Light Scattering Study of Glass Transition Temperatures of Glucose-Water Mixtures
서정아,오지영,김형국,황윤회 부산대학교 유전체물성연구소 2004 유전체 논문집 Vol.3 No.
We studied glass transition temperatures of glucose-water mixtures by using Brillouin light scattering. We fitted the polarized components of the Brillouin spectra measured by backscattering geometry to simple Lorentzian form and estimated the glass transition temperature from the slope of the temperature-dependent Brillouin peak shift.
Dielectric properties of the near stochiometric KLN crystal in the ferroelectric Curie range
Yoon-Hwae Hwang,Byeong-Eog Jun,Chungsik Kim,Dong-Jin Kim,Hyung-Kook Kim,Jung-Nam Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The dielectric constants of near-stoichiometric potassium lithium niobate (K2:83Li1:84Nb5:33O15:66 , KLN43) crystal in the frequency range from 100 Hz to 1 MHz showed a dielectric anomaly at maximum temperatures around Tmax = 510 C. At low frequencies, ranging from 100 Hz to 10 kHz, the dielectric maximum temperature Tmax shifted to higher temperature as the frequency increased in the Curie range. The impedance Cole-Cole plot in the Curie range could betted by the complex nonlinear least squares (CNLS) method with two parallel Rcircuits in series: Z(!) = R1=[1 + (i!)n11]+R2=[1 + (i!)n22], where 1 and 2 are the relaxation times,1;2 = R1;2C1;2. The universal capacitance Ce= C(i!)n1 was applied for each RCecircuit. This observation suggests that the universal dynamic response of KLN43 crystal in the Curie rangewas the superposition of the low-frequency dispersion (LFD) due to the mobile charge carriers and to the rotational dielectric relaxation mechanism in the dipolar regions.
The Ionic Conduction and Dielectric Properties of Pure and Na-Doped K3Li2..xNb5+xO15+2x Crystals
전병억,Yoon-Hwae Hwang,Chung Sik Kim,Dong Jin Kim,Gwang Soo Jeen,Hyung Kook Kim,Jung Nam Kim,Suk Chul Song 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Pure and Na-doped potassium lithium niobates (KLN) crystals were grown by r.f. heating Czochralski method from the melts composition Na2O : K2O : Li2O : Nb2O5 = x : 32 - x : 25 : 43 (x = 0, 2 mol%). Tetragonal cell volume of the Na-doped KLN crystal decreases compare to the pure KLN, because K+ ions in the A1 sites were partially replaced by Na+ ions. The ferroelectric phase transition was observed from the dielectric properties along the polar c-axis of pure and Na-doped KLN crystals. The Curie temperature of pure and Na-doped KLN were 502 C and 456 C, respectively. Both KLN crystals showed the strong low frequency dielectric dispersion at about phase transition temperatures in the frequency range of 100 Hz 10 kHz. The ac conductivity showed a slope change at the Curie temperature in the Arrhenius plot of log(kBT33) vs. 103=T . The electrical conduction in pure and Na-doped KLN crystals originates mainly from the ionic hopping. The Li+ ions in A1 sites are considered to be the main charge carriers. The activation energy at lower temperature of pure and Na-dope KLN were 0.83 eV and 0.72 eV, respectively.
A Study of Structures in ZnO and ZnO:V2O5 Thin Films by in-situ Synchrotron X-ray Scattering
S.W Hwang,Yoon Hwae Hwang,H.K. Kim,Kwang-Nak Koh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
We investigated the structural properties of ZnO and ZnO:V2O5 thin films by using X-ray diffraction (XRD). The ZnO and ZnO:V2O5 films were grown on (0001) sapphire (-Al2O3) substrates at 400 C by using a pulsed-laser deposition (PLD) technique. The thin films were deposited at different ambient pressures ranging from 5 × 10.6 Torr to 3 × 10.1 Torr and the ambient pressure was controlled by using high-quality oxygen gas. All films were post-annealed in the deposition chamber at 400 C for 1 hour. The out-of-plane XRD data show that the films were oriented along the c-axis. The in-plane -scan of the (101) plane data shows that the films have 6-symmetry or 12-symmetry, depending on the ambient pressure (oxygen gas pressure).
Vu, Hong Ha Thi,Hwang, Yoon-Hwae,Kim, Hyung-Kook Korea Photovoltaic Society 2016 Current Photovoltaic Research Vol.4 No.2
Increasing the efficiency of dye-sensitized solar cells (DSSCs) by the fabrication of new photoelectrodes (PEs) is an important challenge. This study examined the photovoltaic parameters of DSSCs composed of a $TiO_2$ PE with $WO_3$ nanoparticles (NPs). A number of PEs with the same thickness but different concentrations of $WO_3$ NPs in the $TiO_2PE$ were prepared. The morphology and structural properties of the prepared PEs were examined by field-emission scanning electron microscopy and X-ray diffraction, respectively. The effects of the $WO_3$ NPs mixing concentration on the efficiency of DSSCs were investigated under simulated solar light irradiation.
Characterization of Thermal Expansion in Li$_3$VO$_4$ Single Crystals
Dong Jin Kim,Yoon-Hwae Hwang,전병억,Chung-Sik Kim,Gwang Soo Jeen,Hyung Kook Kim,Jung Nam Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We studied the thermal expansion of Li3VO4 single crystals by using high temperature X-ray diraction (HTXRD) method and thermo-mechanical analysis (TMA) technique. We found abnormalies in the temperature dependent cell parameters at temperatures 720 C and 770 C. The observed abnormalies may originate from the intermediate phase which has the sub-group structure of orthorhombic structure.