Materials Literature
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系统合成了不同粒径的CeO2和Ag纳米粒子及Ag-CeO2纳米复合粒子，并对其进行了结构表征和CO催化氧化性能测试．结果表明，Ag纳米粒子的催化活性较低，以其为催化剂时CO的最大催化转化率仅为40％，且粒径越小越容易失活；在CeO2纳米粒子催化下，CO的催化转化率可达到100％，但催化反应的温度较高（约350℃）；与CeO2和Ag相比，Ag-CeO2的催化性能明显增强，CO在较低的温度（150℃）下可实现完全转化．程序升温还原（Temperature-programmed reduction，TPR）分析结果表明，纳米复合材料中Ag和CeO2作用是产生优异催化性能的关键原因．
The problems of an electromagnetic wave that is incident on a plane dielectric interface consisting of two different mediums have been the important research subjects for many years [1]–[10]. When the beam is incident on the dielectric interface from the denser medium, the lateral displacement (or Goos-Hanchen shift)…
Высокочастотные, "квантовые" Рё электромеханические эффекты РІ квазиодномерных кристаллах СЃ волной зарядовой плотности, РџРѕРєСЂРѕРІСЃРєРёР№ Р’.РЇ., Зыбцев РЎ.Р“., Никитин Рњ.Р’., Горлова Р
IN PRESENT study, sol-gel derived glasses were prepared based on … the following general formula :SiO2-CaO-P2O5-K2O and different concentrations of -Li2O (0-10 wt.%) were substituted for K2O in the studied system. The influence of these substitutions is investigated for both in vitro apatite formation ability and stru…
The article deals with the determining of fatigue lifetime of structural materials during multiaxial cyclic loading. The aim of this investigation is to evaluate the influence on fatigue behavior of the welded aluminum alloy EN AW 6063-T66. Experimental device was designed for combined bending - torque loading. The ex…
In this report, the surface properties and microstructure of chromium-molybdenum steel samples prepared by two-stage gas nitriding with a short isothermal time in stage one are compared with those prepared by one-stage gas nitriding. Two-stage gas nitriding was performed with a short isothermal time in stage one follo…
The aim of this study was to determine the in-plane shear properties of polyester ribs fabric by the pull-out method and analyticalrelations were developed to calculate the shearing properties. After the yarn in the fabric was pulled from the top ravel region before thestart of the crimp extension stage, it was found…
Seramik karolarin pisirilmesi sonucu olusan boyut kuculmesi, uretim sureci icin oldukca onemlidir. Seramik karolarda kuculme kullanilan hammaddelerden, sekillendirme ve pisirme kosullarindan etkilenmektedir. Deney tasarimi metotlarindan biri olan Yanit Yuzey Yontemi (RSM) uretim ve urun kalitesinin iyilestirilmesinde…
The effect of using different stabilizing agents for the synthesis of CuO nanocrystals on the morphological structure was studied. Spec grad CuCl2 and three different stabilizing agents LiOH, NaOH and kOH were used as starting materials. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), selected…
As rochas da superfície terrestre estão permanentemente expostas à ação de agentes naturais, como a água, as variações de temperatura, os gases atmosféricos e a ação dos seres vivos. Dentre a ação dos seres vivos, nos centros urbanos destaca-se a ação antrópica, que por vezes acaba por degradar os recursos naturais. N…
The popularity of these annual cover images as posters and postcards continues to grow and the complete set of our January cover cards is now an impressive collection. At your next crystallography meeting or workshop why not call at the IUCr Journals display and see for yourself. Be prepared for crowds during coffee b…
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본 연구에서는 중공형 나노 입자의 구조체가 되는 구형 폴리스티렌을 조절된 유화중합법으로 여러 크기의 구형 폴리스티렌을 제조하는 연구를 수행하였다. 유화중합에 사용되는 유화제의 농도를 조절하여 구형 폴리스티렌의 크기를 임의로 조절하였다. 이 폴리스티렌을 구조체로 이용하여 중공형 중간세공 실리카를 합성하였으며, 합성 과정 시 반응속도의 조절을 위해 에탄올을 넣어 실리카 전구체의 가수분해 속도를 조절하고, 실리카 전구체의 투여량을 조절하여 중공형 중간세공 실리카의 벽 두께를 조절하였다. In the present study, we synthesized mesoporous…
UV 경화형 우레탄아크릴레이트 수지와 유기화클레이를 혼합한 후 UV를 조사하여 경화시킴으로써 폴리우레탄-클레이 나노복합체를 제조하였다. 유기화클레이로서는 Closite20A (C20A) 및 이를 실란처리하여 표면에 아크릴기를 도입한 아크릴변성 C20A를 사용하였다. XRD와 TEM 분석으로부터 제조된 나노복합체는 삽입형 나노복합체이며, 아크릴 변성시킨 C20A가 변성시키지 않은 C20A에 비해 더 잘 분산되는 것을 알 수 있었다. DMTA, 연필경도분석, PET 필름에의 부착성 시험으로부터 클레이 첨가에 의해 유리전이온도와 저장탄성률 및 연필경도가 증가하고 PET…
${\beta}$ -cyclodextrin은 다른 분자를 포접하여 inclusion complex (포접착물)를 만드는 특성을 가지고 있기 때문에 의약품, 농약, 식품, 화장품, 산화방지제, 휘발방지제, 흡습방지제, 퇴색방지제, 유화제 등의 다양한 용도로 사용되고 있다. 이러한 장점에도 불구하고 ${\beta}$ -cyclodextrin은 물이나 유기용매에 대한 용해도가 낮아 사용에 제약을 받아왔다. 본 연구에서는 이러한 문제를 해결하기 위해서 Bisphenol-A나 폴리우레탄(PU) 발포제인 cyclopropane에 대한 포접특성을 갖고 물이나 유기용매에 대한 용…
In this paper, a simple method to fabricate two-dimensional (2D) nanostructures is demonstrated. Sn nanostructures are deposited on porous anodic alumina membrane (PAA) by using thermal vapor deposition technique. According to SEM images the deposited nanostructures have two different morphologies; thin nanoporous fil…
The effect of ammonia distribution upstream selective catalytic reduction converter on selective catalytic reduction conversion efficiency has been studied in this paper. The results indicate that the more uniform ammonia concentration distribution upstream converter is, the higher NOx reduction rate and lower NH3 sli…
CrN/AlN multilayer coatings with various bilayer periods in the range of 1.8 to 7.4 nm were synthesized using a closed-field unbalanced magnetron sputtering method. Their crystalline structure, chemical compositions and mechanical properties have been investigated with Auger electron spectroscopy, X-ray diffractometry…
This work focused on corrosion of carbon steel bolted GECM/Al parts in tap water and NaCl solutions. In tap water and NaCl solutions, open circuit potential of GECM and its potentials in a series of carbon steel bolt>Ti>Al became active. Regardless of test materials, open circuit potentials in tap water were noble, an…
Two kinds of heterometal coordination polymer precursors, {Sm[M(ox)3]·nH2O}x (M = Fe and Co), were prepared by the reaction of K3[M(ox)3]·3H2O with Sm(NO3)3·nH2O in methanol solvent. These compounds were found to have oxalato-bridged network structure. On the other hand, the desired heterometal coordination polymer pr…