Materials Literature
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We study the effects of noise in scanning electron microscope (SEM) images on the size and roughness of contact holes when they are measured using top-down SEM images. The applied methodology is based on the generation of synthesized top-down SEM images, including several model contact edges with controlled roughness,…
Raman scattering spectra have been collected on p-type 4H-SiC samples doped with aluminum up to 5×1019 atoms per cubic cm. The distortion and asymmetry of FTA modes which appear in the low frequency range has been probed in great details. We show that, using standard Fano formulae with three parameters per mode, one c…
Spin polarization of 5d conduction electrons induced in the Au layers of antiferromagnetically coupled Fe/Au metallic superlattice was investigated by resonant X-ray magnetic diffraction at the Au L3 absorption edge. Superlattice reflections around the Au 002 Bragg peak were measured in the magnetic saturation state w…
In this paper, results shows that expanded graphite of 128mL/g could be produced under the nitric acid treatment with the optimum mixture ratio of graphite: HNO3: H2O2: KMnO4 being 1(g):6(ml):2(ml):0.02(g), compared with the 145ml/g under the sulfuric acid treatment (graphite: H2SO4: H2O2 =1(g):3(ml):2 (ml)). The sulf…
이 연구에서는 녹차-목재섬유 복합보드의 강도성능과 기능성을 보강한 건축내장재를 개발하기 위하여, 목재섬유에 녹차와 흑탄, 백탄, 활성탄 등 3종류의 숯을 혼합한 녹차-숯-목재섬유 복합보드를 제작하였고, 구성원료의 종류 및 그 배합비율이 복합보드의 정역학적 성능에 미치는 영향을 조사하였다. 녹차-숯-목재섬유 복합보드의 휨 강도성능은 백탄함유 복합보드에서 평균적으로 가장 높은 값을 나타내었으나, 숯의 종류에 따른 휨 강도성능의 차이는 크지 않았다. 그러나 그 값은 선행연구의 녹차-목재섬유 복합보드보다 현저한 휨 강도성능의 향상을 나타내었고, 녹차와 숯의 배합비율이 증가…
본 연구에서는 알루미나 나노섬유의 함량을 20에서 100 phr까지 달리하여 알루미나 나노섬유와 분말이 첨가된 에폭시 복합재료의 열전도도 및 파괴인성에 미치는 영향에 대해서 살펴보았다. 열전도도는 열전도도분석기로 측정하였고, 파괴인성은 임계응력세기인자( $K_{IC}$ ) 측정을 통하여 고찰하였다. 모폴로지는 주사전자현미경(SEM)으로 관찰하였다. 실험결과, 알루미나 나노섬유의 함량이 증가함에 따라 열전도도가 향상됨을 확인할 수 있었으며, 알루미나 나노섬유의 함량이 열전도도를 결정하는 중요한 요소임을 알 수 있었다. $K_{IC}$ 값도 알루미나 나노섬유의 함량이…
We explore theoretically the possibility of growing GaN films in a nonpolar orientation on planar high-index Si($hhk$) substrates. Candidate substrates were identified by requiring that they are well lattice matched, on a length scale of several unit cells, to GaN in the nonpolar $m$-plane orientation. These candidate…
We report the observation of a positive temperature coefficient of resistance in strongly coupled quantum dot (QD) arrays. Conductivities of lead selenide (PbSe) QD thin films treated with 1,2-ethanedithiol increase when cooled from room temperature to 78 K, consistent with bulk PbSe crystals and indicating bandlike t…
A zinc hydroxystannate-coated mineral grade Mg(OH)2 (ZHSCMH) was synthesized as flame retardant and smoke suppressant for flexible poly (vinyl chloride). The powder of ZHSCMH was characterized by the x-ray diffraction (XRD) and scanning electron microscopy (SEM). The flame retardancy, smoke suppression and thermal beh…
The paper discussed the effects of Ce, Mn, Cr on the microstructure and properties of high-iron eutectic Al-Si piston alloy using orthogonal design. It has been found that Mn and Cr improved the morphology of β phase (Al9FeSi3), becoming the Fe phase that consists of Mn and Cr; Rare earths Ce has a strong effect on re…
Due to its inert chemical nature, plasma etching is the most effective technique to pattern SiC. In this paper, dry etching of 4H-SiC substrate in Inductively Coupled Plasma (ICP) has been studied in order to evaluate the impact of process parameters on the characteristics of etching such as etch rate and trenching ef…
Nanofiber are defined as diameter less than 1 micron is under development for future medical application. The simple method was used to prepare a nonwoven in nanofiber of shellac (SHL) and polyvinylpyrrolidone (PVP) is electrospinning machine. The objective of the present study was to investigate the effect of electro…
3C-SiC is the only polytype that grows heteroepitaxially on Si substrates and, therefore, it is of high interest for various potentail applications. However, the large (~20 %) lattice mismatch of SiC with the Si substrate causes a serious problem. In this respect, rotated epitaxy of 3C-SiC(111) on the Si(110) substrat…
This study examines the effects of twisted steel fiber obtained by changing the shape of the fiber in order to improve the toughness of the conventional straight steel fiber. Three types of twisted fiber with different lengths (l) and diameters (d) are considered while maintaining the aspect ratio (l/d) to 100. Flexur…
The objective of this study was to investigate the influence of acetylation on properties of paper made using the chemi-mechanical pulp (CMP) process. Industrial unbleached CMP pulp was provided (before and after refining), and paper handsheets were made. After drying, the specimens were acetylated on a heated cylinde…
The peculiarities of martensitic transformations and formation of nanostructured states in metastable austenitic steel (Fe-18Cr-8Ni-Ti) after severe plastic deformation by high pressure torsion are investigated. It is shown that during severe plastic deformation with increased strain rate not only direct (γ→α΄) but al…
Abstract Herein, we describe the combination of polyoxometalates (POMs) with a polynuclear metallic cluster Mn4 {Mn4 = [Mn4(OAc)2(pdmH)6]2+, (pdmH = deprotonated pyridine‐2,6‐dimethanol; C7H8NO2)} for the construction of ionic crystals with layered architectures. Choosing a POM with the appropriate charge and size not…
Effect of rolling rate on texure of Ti-Mo-Al-Zr shape memory alloy was investigated using X-ray diffraction pole figure measurement and electron backscattering pattern (EBSP) analysis to optimize the thermomechanical processing. Ti-Mo-Al-Zr alloy is a candidate Ni-free shape memory alloy to replace Ti-Ni alloy in medi…
In this work, the effect of PE-g-MAH as compatibilizer in polyethylene/ natural rubber/ water hyacinth fibers composites were prepared and characterized in terms of tensile properties, morphology properties, swelling behavior and FTIR characteristic. Water hyacinth fibers (WHF) was used as reinforced fiber in the comp…
ZnO nanorods were deposited on ITO glass substrate via chemical bath deposition at low temperature of 90°C. The seeding solution was made by dissolving zinc nitrate tetrahydrate and methenamine in cool water (5°C). The as-synthesized ZnOs were further subjected to post-hydrothermal treatment series.The results of scan…