Materials Literature
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金老(Rh ) 是为许多化学转变过程的许多催化剂的一个批评部件。控制 Rh nanocrystals 的形状由于在催化活动 / 选择和表面之间的靠近的关联把一条有效线路提供给他们的催化表演的优化原子结构。它也帮助实质地减少装载数量并且因此完成这少见、宝贵的金属的持续使用。在这篇评论文章，我们旨在提高他们的催化性质在 Rh nanocrystals 的控制形状的合成集中于最近的进步。传统、最新开发的合成策略和生长机制将基于盖住代理人，减小动力学的操作，表面散开率的控制，蚀刻的氧化的管理，和电气化学的改变的表面的使用被讨论，包括那些。我们也使用二个例子加亮控制形状的合成为在催化应用提高这金属的使用提供的唯一的机会。策略能也被扩大到另外…
Ozone(O3) is an important atmospheric oxidant. Black carbon(BC) particles released into the atmosphere undergo an aging process via O3 oxidation. O3-aged BC particles may change their uptake ability toward trace reducing gases such as SO2 in the atmosphere,leading to different environmental and health effects. In this…
The mixed adsorption of a cationic gemini surfactant,ethanediyl-1,2-bis(dodecyldimethylammonium bromide) 12-2-12),and a nonionic surfactant,polyoxyethylene mono-dodecyl ether(C_(12)E_n,where n = 4,10,23) at the air/water interface was studied using surface tension measurements.The dilational viscoelastic properties of…
The nucleation and epitaxial films of ZnO on Si substrates were investigated by metal-organic chemical vapor deposition( MOCVD). As is known to all,the morphology and crystalline quality of ZnO are determined by both the nucleation and epitaxy process. In this paper,the effect of temperature on the growth of ZnO films…
SnS thin films were prepared on glass substrates by RF magnetron sputtering technique.The crystalline structure,composition,surface morphology,film thickness,transmittance and reflectance of the films were characterized by XRD,EDS,AFM,FE-SEM and UV-Vis-NIR spectroscopy,respectively. The results show that the increase…
A study on natural radioactivity in virgin and agricultural soil samples collected from Sungai Petani was conducted using high-purity germanium. The mean activity concentrations of 226 Ra, 232 Th, and 40 K in virgin soils were 51.06±5.83, 78.44±6.42, and 125.66±7.26 Bq kg −1 , respectively, while those in agricultural…
Combustion characteristic in growth chamber for preparation of single crystal with hydrooxygen flame fusion method was investigated. The results show that along the centerline of growth chamber a peak temperature 3504.3 K could be reached when the flow rates of oxygen and hydrogen were 6 L/min and 20 L/min respectivel…
generalized-stacking-fault 精力被计算说明 c 的分离 ?+? 脱臼在上金字塔形我在镁的飞机。\的表面(\{ 10 \bar { 1 } 1 \}\)飞机和它的邻近的飞机\(\{ 30 \bar { 3 } 4 \}\)并且\(\{ 30 \bar { 3 } 2 \}\)用刘 embedded-atom-method 被介绍潜在的方法，和\的一条可能的分离路径( 1/3 \langle { 11 \bar { 2 } 3 } \rangle \)\上的脱臼(\{ 10 \bar { 1 } 1 \}\)有最小的精力的飞机被预言。同时，另一合理分离\的二条路径( 1/3 \langle { 11 \bar…
Polyimide membranes were synthesized by the polymerization of five diamines,p-phenylenediamine(PPD),2,3,5,6—tetramethyl-1,4-phenylenediamine(TMPPD),4,4'-oxydianiline(ODA),4,4'-(4,4'-isopropylidenediphenyl-1,1'-diyldioxy) dianiline(BAPP) and 4,4'-(hexafluoroisopropylidene) bis(p-phenyleneoxy) dianiline(BDAF),and the sa…
An amino-functionalized metal ion-imprinted adsorbent was newly synthesized for the selective extraction and removal of Cu( Ⅱ) from aqueous solution. The adsorption capacity of the amino-functionalized ion-imprinted adsorbent was found to be significantly more than that of several adsorbents reported in the literature…
和交流频率 ? Hz。试验性的结果显示随 AC 当前的密度的增加，一个 X60 钢电极的腐蚀潜力否定地变了，阳极的当前的密度显著地增加了，并且腐蚀率增加了。而且随 AC 频率的增加， X60 电极的腐蚀潜力断然变了，阳极的当前的密度减少了，它处于腐蚀率导致了减少。而且， X60 电极的形态学显示那一致腐蚀发生在低交流水流密度；当腐蚀坑在高交流水流密度，和严重损坏的深腐蚀坑在 X60 电极表面上被发现时，管道和力量导致漏。
H-NMR ) 。传播电子显微镜(TEM ) 和散布的小角度 X 光检查(萨克斯风管) 分析证明 PVC-g-P4VP 与领域间距的 37.6 nm 展出了分开 microphase 的、订的结构，它没在整洁的 PVC 被观察。为抗菌剂应用， PVC-g-P4VP 的第三级的氮原子是使用 1-bromohexane，由 FTIR 大小证实了的 quaternized。细菌包括 Escherichia coli (E。coli ) ，葡萄球菌 aureus (S。aureus ) ，杆菌仙影拳(B。仙影拳) ，并且 Pseudomonas aeruginosa (P。aeruginosa ) 完全在 quaternized PVC-…
The thermodynamic properties of crystals can be routinely calculated by density functional theory calculations combining with quasi-harmonic approximation.Based on the method developed recently by Wu and Wentzcovitch(Phys Rev B 79:104304, 2009) and Wu(Phys Rev B 81:172301, 2010), we are able to further ab initio inclu…
有不同微观结构的镍涂层被脉搏喷气电极淀积技术综合。他们的形态学和微观结构被扫描电子显微镜学(SEM ) 和传播电子显微镜学(TEM ) 调查。涂层的腐蚀性质被使用极化学习，电气化学的阻抗光谱学(EIS ) ，零免费费用(PZFC ) 潜在大小和 Mott-Schottky (MS ) 关系。结果证明有 50 nm 的谷物尺寸的涂层与 10 nm 的谷物尺寸比那拥有了更高的腐蚀电阻。这反常行为可能与在涂层和在被动电影的领受人的更低的集中的 nanoscale 双胞胎的存在有关。
nano 金属氧化物的抗菌剂性质(ZnO， CuO ) 基于反应的氧种类(ROS ) 的形成。这个工作表明这些 nano 金属氧化物的抗菌剂性质强烈依赖于他们的水晶的结构。nanooxides 的抗菌剂活动对通常引起医院的感染的细菌的四种类型被测试。sonochemical 方法在纺织品上为 nanooxides 而且到他们的涂层的合成被使用不仅。与商业、 sonochemically 准备的 nano 金属氧化物涂的纺织品的抗菌剂性质被评估并且比较。毒性在人的肺房间和两栖动物胚胎上被评估，作为为吸入和水的毒物学的代表性的模型。sonochemically 准备的金属 nanooxides 比有一样的粒子尺寸范围的商业地可得到的金…
Solution-aging treatment was performed to a high-strength and high-toughness titanium alloy.Several microstructural feature including volume fraction of primary α phase,size factor of primary α phase,volume fraction of secondary α phase,αs/ β interface density,were quantitatively characterized. By making a statistical…
Graphene 由于它的非凡的结构、机械、电子的性质吸引了化学家，物理学家，和材料科学家的兴趣。当太古的 graphene 为要求高电的传导性的应用是合乎需要的时，许多另外的应用要求修改或 graphene 的 functionalized 形式例如 graphene 氧化物，减少了 graphene，或另外的 functionalized 形式。通过化学 functionalization 修改 graphene 的在结构上为调节它的结构揭示众多的可能性；几个化学、物理的 functionalization 方法被探索了改进 graphene 的稳定和修正。在这评论，我们向 graphene 的化学修正报导最近的进步，包括共有…
We extracted crude polysaccharide( BPS) from bamboo leaves by the method of supercritical CO2 extraction. The BPS was fractionated and precipitated by ethanol,and then protein was removed and further separated and purified by cellulose column. Physical and chemical indicators of the purified BPS were investigated. Res…
To forecast the as-cast structure and ferrite-austenite phase ratio of 2205 duplex stainless steel(DSS), the effects of cooling rate and forced convection were observed in a high-vacuum resistance furnace in which the forced convection was created by the rotation of the crucible. The as-cast structure of all 2205 DSS…
The influence of an electric field on metallic single walled carbon nanotube(SWCNT) interconnects is studied. A voltage-dependent equivalent circuit model is presented for the impedance parameters of single-wall carbon nanotubes that capture various electron–phonon scattering mechanisms as a function of the electric f…