Materials Literature
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Bimetallic palladium-gold (PdAu) nanoparticle (NP) catalysts have been demonstrated for the better catalytic performance than monometallic Pd catalysts in various reactions; however, the enhancement mechanism is not completely clear for most reactions. This thesis addresses the investigation of PdAu NP catalysts with…
In this paper, the sawdust was used as the starting material. A urea or a melamine was added to sawdust as the nitrogen compound, and K2CO3 was added to this mixture as an activation reagent. We tried to produce the activated carbon with large specific surface area from this mixture by chemical activation. The result…
전분필름의 물성에 미치는 고압균질 처리의 영향을 검토한 결과, 고압균질처리 옥수수전분필름은 산화전분필름과 유사한 투명도를 가지며, 용해도와 산소투과억제력의 증가와 함께 인장강도가 다소 높아지는 것을 확인하였다. 이러한 고압균질처리 옥수수전분필름의 물성변화는 고압균질기의 고압과 전단력에 의해 호화전분입자가 완전히 소실되고 전분의 용해도 증가와 보다 균일한 분산상이 형성되기 때문으로 판단되었다. 일반적인 호화과정을 통해 형성되는 전분필름의 구조는 연속상의 아밀로오스에 팽윤된 접분입자가 분산되어 있는 network 형태에서 형성된다. 반면 고압균질처리의 경우, 호화전분입…
Preparation and characterization of radiation-grafted poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) membranes for alkalineanion-exchange membrane fuel cells
为获得充分水解,且尽量避免缩聚的有机硅氧烷水解产物,以γ-（2,3-环氧丙氧）丙基三甲氧基硅烷（GPT-MS）为例,对有机硅氧烷的水解工艺进行研究。结果表明,中性介质、常温搅拌有利于降低水解得到的Si-OH发生缩聚反应;Si-OH的缩聚反应随着水含量的增加而下降,GPTMS的水解、缩聚反应随着反应温度的提高而加快;GPTMS与水的质量比为100∶28,常温搅拌至溶液无分层且澄清,即可获得水解完全且基本无缩聚反应发生的GPTMS水解产物。
The use of nanoporous membranes in molecular separation or sieving, which involve the separation of molecular mixtures, is gaining rapid interest. The ability to modify and alter their pore size and dimensions, along with the physical and chemical properties of the material that constitute these pores make them highly…
利用熔融共混法制备高密度聚乙烯（HDPE）／水滑石（LDH）复合材料，研究乙烯-丙烯酸共聚物（EAA）对复合材料的增容作用、力学性能以及结晶行为的影响。结果表明：EAA可以促进HDPE基体的结晶速率，提高复合材料结晶度：EAA对复合材料有很好的增容作用，能明显增强LDH与HDPE之间的界面粘合，促进LDH在基体中的有效分散；力学测试表明：加了EAA的复合材料比没有加EAA的复合材料力学性能有明显提高，且能使强度和韧性同时提高。
在醇溶液中合成了标题配合物[Co（PMBP）2（MeOH）（EtOH）]（HPMBP=1-phenyl-3-methyl-4-benzoyl-pyrazolone-5）,并进行了元素分析、红外光谱、摩尔电导率、X-射线衍射等表征。结果表明此配合物属单斜晶系,空间群为P2（1）/n,晶胞参数为：a=13.802（2）b,=13.889（2）nmc,=17.488（3）,α=90°,β=100.805（2）°,γ=90°,V=3292.9（9）,Z=4,Dc=1.395 Mg.m-3,μ=0.575mm-1,F（000）=1444。配合物中的金属钴离子与2个PMBP-中的4个氧原子以及2个醇分子中氧原子配位,而形成六配位的变形八面体。
In recent years polymer/layered silicate (PLS) nanocomposites have attracted great interest, both in industry and in academia, because they often exhibit remarkable improvement in materials properties when compared with virgin polymer or conventional micro and macro-composites. These improvements can include higher mo…
In clause the basic data on modelling ramming working body for condensation various grounds. Dependences for definition of the cores parameters of ramming working body are resulted: the geometrical sizes of the ramming plate, demanded values of contact pressure on a surface of a ground at the set thickness of a conden…
Quaternized pyridine derivatives have attracted interest for many years from various perspectives, especially for potential applications in electronic/optical devices.1 Pyridinium salts are readily synthesized, highly stable, and often combine intense visible absorptions with reversible electrochemistry. Notable recen…
The early stages of culture of the Chilean scallop Argopecten purpuratus are affected by the mortality attributed to the presence of pathogenic bacteria. The purpose of this study was to characterize the culturable bacteria present in larval cultures of A. purpuratus in the presence and absence of antibiotic (Tetracyc…
Biodiesel was synthesized by industrial palmitic acid and methanol,using solid superacid catalyst SO42-/SnO2-CeO2 which was prepared by sol-gel method.Effects of the mole fraction of CeO2 in SnO2-CeO2,the calcination temperature and the time of calcination,the concentration of sulphuric acid,the mass ratio of methanol…
Second-order scattering induced re∞ection divergence and nonlinear depolarization on randomly sub-wavelength corrugated semiconductor nano-pillar surface is observed, which explains the nonlinear transverse electric (TE)/transverse magnetic (TM) mode transformation of the nano-pillar surface re∞ection with diminishing…
The use of medical implants has significantly improved the survival and quality of lives of the world population and has been an indispensable procedure in health care industry nowadays. Biofilm formation, which is mainly composed of microorganisms within a protective extracellular matrix, is a major barrier in the lo…
Water dissociation and the energetics of the WGS reaction on a bulk MgO, an Ag supported MgO thin film and Au/MgO/Ag surfaces is studied based on the density functional theory. The literature results for water splitting on MgO and MgO/Ag surfaces with a step type defect are repeated and further analysis on the origin…
通过原位熔融聚合的方法合成了聚酰胺11（尼龙11）／马来酸酐化乙烯一辛烯共聚物（POE—g—MAH）共混材料，采用XLY-II型毛细管流变仪研究共混物的流变特性。结果表明：PAll及其共混物融体均为假塑性流体，在200～230℃下的非牛顿指数n为0．538～0．775。随着POE—g-MAH含量的增加，表观黏度趋于增加。POE—g—MAH的加入导致体系的黏流活化能下降，表明共混材料的表观黏度对温度的敏感性降低，易于加工成型。
Bichromophore 2-[4-(4-nitrophenylazo)-phenylaminopyridinium-1-yl]-1,3-dioxy-2,3-dihydro-1H-inden-2-ide (1) has been prepared in order to develop strategy that allows simultaneously to increase the first molecular hyperpolarizability and to adjust the dipole moment of chromophores. Three synthetic roots to its precurso…
Background: Implant placement should be based on a restoration-oriented treatment plan with correct three-dimensional positioning to allow optimal support and stability of surrounding hard and soft tissues. After tooth extraction the alveolus remodels producing changes in the soft tissues contours. This may translate…
An efficient control system is paramount for the operability of Fuel Cell systems since, in ideal cases, it allows the regulation of power output, temperatures and economic performance under a dynamic working environment where they need to operate. Although several control strategies, scenarios and methodologies have…