Materials Literature
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다양한 이온성 액체를 사용하여 은이 담지된 이산화티타늄 입자를 제조하였다. 합성에 사용된 이온성 액체의 종류에 따라 입자의 물성이 변하는 것을 관찰하였다. 이는 이온성 액체의 특성이 은 입자들의 결합에 영향을 주기 때문이다. 제조된 입자의 촉매 성능을 측정하기 위하여 산소분위기에서 벤질알코올의 산화반응을 실시하였다. 그 결과 1-octyl-3-methylimidazolium tetrafluoroborate를 이용하여 합성한 $Ag/TiO_2$ 입자가 가장 우수한 촉매 활성을 나타내었다. $Ag/TiO_2$ particle was prepared using vario…
(метод термического анализа). m). Обнаружены вакансии фтора в позиции 8с и междоузельные анионы в двух позициях 32f. Соотношение дефектов в структуре Sr0.7Ce0.3F2.3 соответствует тетраэдрической конфигурации кластера дефектов {Sr4 - nCenF26}. Дефектная структура закаленного (со скоростью 25 K/мин) кристалла отличается…
A powder mixtures of 18.72% wt, 17.67% wt Al2O3 and 63.6% wt zircon were prepared and milled in a planetary ball milled for one up to 10 hours in presence of air. After removal Iron impurity from as-milled samples, they were isothermally heated in temperature range of 1300-1450 0C for one hour in an air atmosphere. Af…
In the title complex, [PtCl2(C12H6N2O2)]·CH3CN, the Pt(II) atom lies in a slightly distorted square-planar arrangement defined by an N2Cl2 donor set. In the packed structure, columns of complex moieties are stacked such that the neighboring units are oriented at 180° and laterally displaced with respect to each other.…
A comparative study on the field electron emission properties of the nanocrystalline lead chalcogenide thin films has been made. The structure of the films was established by X-ray diffraction, transmission electron microscopy and atomic force microscopy, which revealed the formation of cubic structure with particle s…
Background: Drug delivery systems were developed to improve the efficiency of drugs and minimize toxic side effects during the 1980s and 1990s. Nanoparticles have the ability to deliver a wide range of drugs to different areas of the body for sustained periods of time. Objective: The aim of this study was to prepare a…
본 연구에서는 바나듐 산화물( $VO_2$ )과 텅스텐이 도핑된 바나듐 산화물(W- $VO_2$ ) 분말을 바나듐 산화물( $V_2O_5$ )과 옥살산수화물로부터 수열합성과 하소공정을 통하여 성공적으로 제조하였다. 시료들의 결정구조와 열변색 특성들은 FE-SEM, XRD, XPS, DSC 및 UV-Vis-NIR 분광기를 이용하여 분석하였다. W- $VO_2$ 시료에 W의 도핑량을 증가시키면, W- $VO_2$ 시료의 상전이 온도가 $70^{\circ}C$ 에서 $42^{\circ}C$ 로 낮아지는 경향이 있었다. 또한, W- $VO_2$ 시료를 상전이 온도 이상으로…
본 연구에서는, 화력발전소 및 소각로 후단에서 발생되는 $NH_3$ 를 제어하기 위한 $W/TiO_2$ 촉매의 $NH_3$ 산화 반응 특성 연구를 수행하였다. 그 결과, $W/TiO_2$ 촉매의 텅스텐 최적함량은 10 wt% 임을 도출하였으며, 그 이상의 텅스텐을 담지 할 경우 비표면적의 감소로 인한 효율저하를 확인하였다. 또한, $NH_3$ 주입농도가 420 ppm 이상으로 주입될 경우 중 저온의 온도구간에서 효율저하를 나타냈으며, 수분이 존재할 경우 경쟁흡착으로 인한 효율저하가 발생하였고 산소농도가 증가할수록 $NH_3$ 의 전환율은 우수해지지만 $N_2$ 의…
Direct current control has been used in many voltage source converters connected to the grid, such as shunt active power filters. In their stationary coordinates control systems, there are two closed control loops, one is the current loop and the other is the voltage loop. In practical applications, because the voltag…
Kurzfassung In der Regel werden Wälzlagerstähle martensitisch gehärtet und auf verschiedenen Temperaturstufen angelassen, um bestimmte Eigenschaften wie Festigkeit und Restaustenitgehalt einzustellen. Martensitische Stähle sind durch eine starke Verfestigung (zwangsgelöster Kohlenstoff; feines Gefüge) gekennzeichnet.…
A method for locally sensing and storing data of transverse domain wall chirality in planar nanowire logic and memory systems is presented. Patterned elements, in close proximity to the nanowires, respond to the asymmetry in the stray field from the domain wall to produce a chirality-dependent response. When a bias fi…
A novel type of superparamagnetic iron oxide nanoparticles (SPIONs) with dual coatings was reported to address the problem of poor loading capability of traditional SPIONs. It was found that the loading of a model drug, paclitaxel, in such SPIONs increased up to ca. 190 times.
Abstract The understanding of complex bio‐mechanisms in nature is explored in this perspective as a way to effectively enable scientific advancements in membrane technology. The mechanisms of nature‐inspired technological improvements are first analyzed from macroscale to nanoscale. Separation methods using membranes…
Abstract We show that the sporadic simple group M(22), the exceptional group of Lie type 2E6(2) and their automorphism groups are uniquely determined by the approximate structure of the centralizer of an element of order 3 together with some information about the fusion of this element in the group.
Przedstawienie wyników badań stali P91 w stanie dostawy i po 80 000 h przepracowanych na rurociągu pary świeżej oraz wskazanie parametrów porównawczych stanowi treść niniejszego opracowania. W pracy przedstawione zostały wyniki badań składu chemicznego, mikrostruktury, statycznej próby rozciągania oraz charakterystyki…
In this study, we demonstrate an atomic force microscopy process for manipulating multiferroic BiFeO 3 nanodots smaller than 15 nm to desired positions on a Nb ‐doped SrTiO 3 substrate. For formation of the BiFeO 3 nanodot array, nanocrystal movement was achieved using a +1.2 V biased conducting atomic force microscop…
Cu(In,Ga)Se2 (CIGS) thin films were deposited by a two-step process on Mo-coated soda-lime glass substrates. The CuInGa (CIG) precursors were prepared in an in-line evaporation system at room temperature, and then selenised at 500 °C. The two-step processed CIGS films were mechanically compressed at 25 MPa to improve…
Developing a new field of molecular self-assembly in the sub-micrometer regime-with precision as high as that used to make discrete nano-sized molecular architectures through molecular design-is a major challenge for supramolecular chemistry. At present, however, there is no effective strategy for controlling the asse…
The growing demand for using high-performance materials for industrial sheet parts manufacturing actuated us to fabricate wave-formed sheets nanocomposite. A combination of impregnation method and plasma spray forming (PSF) was used for manufacturing of Al/multiwall carbon nanotube (MWCNT) sheets nanocomposite. By add…
This paper reports the nanostructure, formation mechanism, and magnetic properties of tetragonal L10-type Fe55Pd45 (at. %) nanocluster wires (NCWs) fabricated by thermal decomposition of metal nitrates and subsequent hydrogen reduction in nanoporous anodized aluminum oxide templates. The as-synthesized NCWs have diame…