Materials Literature
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The study of radiation absorption in material is an important subject to protect living creatures and environment from harmful effect of radiation. The degree to which gamma radiation is attenuated is dependent upon the energy of the incident gamma radiation, the thickness of the shielding, the atomic number and densi…
Nanostructured diffusion-limited-aggregation (DLA) crystal pattern formation in microemulsion consisting of water, styrene, cetyltrimethylammonium chloride (CTACl), potassium persulphate and an oscillating Belousov–Zhabotinsky (BZ) reactant is reported. A variety of spatiotemporal patterns like concentric wave, spatia…
It is expected that filling a rubber with a small amount of fullerene could lead to a new set of properties, bringing to the composite advantages over the rubbers in use. In the present work, the dielectric and microwave properties of natural rubber (SMR10) based composites containing various concentration of fulleren…
Abstract Langmuir‐Hinselwood (LH) and power rate equations were applied to describe the kinetics of the Fischer‐Tropsch reaction on cobalt catalysts and manganese‐doped cobalt catalysts supported on carbon nanotubes (CNTs). LH‐based kinetics characterize the activity behavior of the unpromoted Co/CNT system satisfacto…
Superconductivity can be induced with the application of pressure but it disappears eventually upon heavy compression in the iron-based parent compound BaFe2As2. Structural evolution with pressure is used to understand this behavior. By performing synchrotron X-ray powder diffraction measurements with diamond anvil ce…
The mechanical properties of low-pressure die cast (LPDC) A356-T6 automotive road wheels are evaluated and correlated with their corresponding microstructures. In this study, two types of alloy wheels processed using different LPDC gating system are investigated. The yield stress, tensile stress, and elongation values…
A solid solution of Nd 1-x Sr x CoO 3-δ (with x=0, 1/3, 2/3, and 1) has been prepared and characterized by a combination of X-ray diffraction, electron microscopy, and electron energy-loss spectroscopy (EELS). The structural characterization indicates that Nd-doped materials present an orthorhombic symmetry with a=√2x…
실리콘 KE-12, NBR 그리고 NR 등의 유전 탄성체 종류, 두께 및 희석제 함유량을 함수로 한 전기활성 유전탄성체(EADE) 구동 성능에 대해 연구하였다. 탄성체의 두께( $1{\rightarrow}0.5{\rightarrow}0.25{\rightarrow}0.1{\rightarrow}0.05$ mm)의 감소에 따라 그리고 희석제의 함유량 증가에 따라 KE-12 탄성체의 작동변위는 증가하였지만, 유전파괴는 낮은 전압에서 발생되었다. 동일한 탄성체 두께(1 mm)에 대해서 KE-12의 변위(2.24 mm)는 동일한 전압(25 kV)에서 NBR 혹은 NR보다 더…
Our lab designs a heat exchangers for hydrogen gas. Coolant is water, thus it is very difficult to determine heat transfer parameters in this gas-liquid system. Repeated experiments gives overdesign value 6.06%, overall heat transfer coefficient 36.32 ( $kcal/m^2-hr-^{\circ}C$ ) for Hydrogen. Theoretically determined…
The extensive use of petroleum product has caused a number of environmental pollution. The printing industry is one of our nation’s largest producers of hazardous waste and volatile organic compound. One of the major alternatives is to use vegetable oil based products as biorenewable raw materials. Hence, the formulat…
Highly fluorescent CdTe quantum dots (QDs) with emission in red to near-infrared (NIR) wavelength were successfully prepared by using 3-mercaptobutyric acid (3MBA) as capping agent. The maximum of quantum yield (QY) could reach up to 82% for QDs with emission peak at 686 nm and FWHM of 66 nm at optimal conditions. The…
Analytical transmission electron microscopy (ATEM) offers great flexibility in identification of the structural-chemical organization of soft materials at the level of individual macromolecules. However, the determination of mechanical characteristics such as hardness/elasticity of the amorphous and polycrystalline or…
Four types of monolayer-protected gold nanoclusters (MPCs) were synthesized and characterized as active layers of vapor sensors. An interdigitated microelectrode (IDE) and quartz crystal microbalance (QCM) were used to measure the electrical resistance and mass loading changes of MPC films during vapor sorption. The v…
The acoustic attenuation spectroscopy in connection with conductivity and dielectric relaxation spectroscopy can be useful techniques for the study of relaxation processes and transport mechanisms in Li+ ion conducting glasses. A theoretical model and mathematical fit of acoustic and conductivity measurements are used…
본 연구에서 아마/비닐에스테르(Flax/vinyl ester)를 적용한 친환경 구조물 설계를 위한 선행 연구로서 아마/비닐 에스테르 자연 섬유 복합재료의 기계적 물성치를 분석하였다. 시편 제작을 위해 VARTM 제작 공법이 적용되었다. 참고문헌에서 제시한 자연 섬유 복합재료의 물성치와 본 연구에서 제작된 시편의 물성치를 비교하였다. 이 결과를 바탕으로 아마/비닐 에스테르 복합재료가 친환경 구조물에 적용하는 것이 유리함을 확인하였다. In this study, an investigation on mechanical properties of flax/vinyl este…
본 연구에서는 InGaZnO 반도체를 제조하기 위하여 출발물질로 사용되는 $Ga_2O_3$ 분말을 침전법을 이용하여 합성하였다. 침전법의 공정 변수인 출발물질로 사용된 $Ga(NO_3)_3$ 의 농도와 aging 시간 및 온도를 제어하여 $Ga_2O_3$ 분말을 합성하고 그 물성을 분석하였다. TG-DSC 분석을 통하여 $Ga(OH)_3$ 의 산화온도 및 $Ga_2O_3$ 의 상전이 온도를 확인하였고, XRD 분석을 통해 $Ga_2O_3$ 의 결정구조와 결정성의 변화를 확인하였다. 또한 SEM 관찰을 통해 $Ga_2O_3$ 분말의 미세 구조와 평균 입도 및 입도 분…
Recently, metamaterial has grabbed prime focus of research fraternity working in the field of antennas, microwave filters and components design. Many different structures of split ring resonators (SRR) for their respective applications have been reported till date. In all of these findings in some way or other, using…
OBJECTIVES: To demonstrate the correlation between the nanostructure formation and the long duration of action in vivo of peptides, the morphology of nanostructures of LXT-101, a novel synthetic amphiphilic peptide of gonadotropin-releasing hormone antagonist were observed when dissolved in different solvents, and the…
Ti-SBA-15 composite materials containing 5 and 10% Ti are obtained by direct synthesis (samples denoted Pt Tix) or by impregnation of SBA-15 with titanium isoporopoxide solution (samples denoted i-Tix, x is Ti concentration). After calcination, the composite Ti-SBA-15 oxides are impregnated with an aqueous solution of…
We present our investigation results on the origin of the morphological defects on graphene films synthesized by chemical vapor deposition method on nickel catalytic substrates. These defects are small-base-area (SBA) peaks with tens of nanometer heights, and they diminish the applicability of graphene films. From ato…