Substituent Effects on Direct Arylation Polycondensation and Optical Properties of Alternating Fluorene-Thiophene Copolymers
Ar ) 机制。紫外可见的吸收和光致发光被学习在四共聚物的光性质上调查取代者效果。结果证明有不同取代者的这些轮流出现的 fluorene-thiophene 共聚物好荧光灯材料并且在作为答辩的应用有希望。
Materials Literature
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Microstructure and Mechanical Properties of 45 vol.% SiCp/7075Al Composite
Microstructure and mechanical behavior of high volume content Si Cp/7xxx Al composites have not been explored yet. Therefore, in the present work, 45 vol.% SiC p/7075 Al composite has been prepared by pressure infiltration method. High density dislocations were found around Si C/Al interface in SiC p/7075 Al composite…
Effect of Ce Addition on the Surface Properties and n-Dodecane Dehydrogenation Performance of Pt–Sn/Ce–Al2O3 Catalyst1
Ce-modified alumina carriers with different Ce content were prepared by vacuum isovolume impregnation method aiming to improve the n-dodecane catalytic dehydrogenation performance of PtSn/Al2O3 catalyst. The support and catalyst were characterized by XRD, N2 adsorption-desorption, NH3– TPD, H2–TPR, CO-pulse adsorption…
Facile Synthesis of Pd-ZnO Microhole Composites with Enhanced Photocatalysis and Its Photoluminescence Properties
In this study, hexagonal-like Pd-ZnO micron composites with nanoscale holes were fabricated via a facile solvothermal synthesis, the prepared samples were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, photoluminescence (PL) and UV-Visible spectroscopy, res…
Gas chromatography/mass spectrometry(GC-MS) analysis of the essential oil from Asarum by molecular distillation(MD) separation
The essential oil extracted from Asarum through steam distillation was fractionated using molecular distillation(MD). The crude essential oil was used for two molecular distillation processes. One residue(RF2) and two distillate fractions(DF1 and DF2) were prepared by MD. Three fractions were obtained under the operat…
Electrochemical and liquid crystal properties of ferrocene-based b-diketonato copper(II) and zinc(II) complexes
Heterometallic liquid crystals are of special interest because of the possibility to combine optical, magnetic and electric properties of different metal ions in one mesogenic molecule. In order to investigate new heteropolynuclear mesogenic systems, the long-chain alkyl bromophenyl ferrocenyl b-diketones and their co…
POLYMERIC NANOGELS AS SYSTEMS FOR DRUG DELIVERING
Selective delivery of drugs in the body is the focus of many research groups in the world. One of the promising nanocontainers is nanogel soft nanoparticles, consisting of hydrophilic or amphiphilic polymeric chains. Nanogels have beneficial characteristics: high loading capacity, stability and sensitivity to environm…
Structural and mechanistic understanding of an active and durable graphene carbocatalyst for reduction of 4-nitrophenol at room temperature
能代替基于金属的催化剂的活跃、持久、没有金属的 carbocatalyst 的发展具有增加科学、工艺的重要性。如此的催化剂的使用将避免例如，包含金属的催化剂引起的问题由稀罕金属资源的重金属和弄空的环境污染。此处，活跃、持久的 graphene carbocatalyst 在周围的温度为 4-nitrophenol 的 carbocatalytic 变换被介绍给 4-aminophenol。carbocatalyst 经由在 L 维生素酸(AA ) 和 graphene 氧化物之间的温和、以水为基的反应被准备(去) 并且没包含任何另外的反应物。在结构和催化性质优化期间，一系列 carbocatalysts 在各种各样的反应温度和 A…
Towards active plasmonic response devices
在科学，化学，物理，和生物学，以及在纳米合并电子学和 photonics 的要求为使小型化的集成电路放大的材料给学科交差的挑战， plasmonics 由处于 nanoscale 电子学的速度和兆兆赫电介质 photonics 的尺寸打破限制用作一座桥。在实时在 plasmonic 性质上启用活跃控制的活跃 plasmonic 系统开创了很多潜在的应用程序。这评论集中于活跃 plasmonic 反应设备的发展。重要进展在对活跃包围媒介的绝缘的性质的控制被完成了，包括液体晶体，聚合物，对光反应变色分子和无机的材料，它接着允许附近的金属 nanostructures 的可逆电浆子回声开关调节。
New method for analyzing recrystallization kinetics of deformed metal by differential scanning calorimeter
The drawn copper wires have been analyzed by differential scanning calorimeter(DSC) and a new method, which uses DSC measurements to determine the Johnson-Mehl-Avrami-Kolmogorov(JMAK) exponent via introducing Arrhenius behavior and modifying the baseline of DSC curves, has been proposed. The results show that JMAK exp…
Effect of B-doping on Microstructure and Magnetic Properties of SmFe_(10)Mo_2 Alloy
Ingots of Sm Fe10Mo2 and Sm Fe10Mo1.5B0.5alloys were made by arc-melting method and followed by annealing treatment, with which nanocrystalline powders of the alloys were prepared by milling.While the effect of B- doping and ball milling on the phase composition and magnetic properties of the bulk and the nanocrystall…
Facile synthesis of Zr-and Ta-based catalysts for the oxygen reduction reaction
Cathode catalysts for direct alcohol fuel cells(DAFCs) must have high catalytic activity for the oxy-gen reduction reaction(ORR), low cost, and high tolerance to the presence of methanol or ethanol. Pt is the benchmark catalyst for this application owing to its excellent electrocatalytic activity, but its high cost an…
Effect of Surface Modification of Carbon Fiber on Friction Properties of Carbon Fiber/Phenolic Resin Matrix Composite
Polyacrylonitrile(PAN)-based carbon fiber was surface modified with HNO3(65-68%) and silane coupling agent(hk550) and of which the structural and surface characteristics of were investigated by SEM, FT-IR, and X-ray photoelectron spectroscopy(XPS). Then the surface modified carbon fiber reinforced phenolic matrix comp…
Microstructure and electrical properties of Sc2O3-doped CaCu3Ti4O12 ceramics
CaCu3Ti4O12 ceramics doped with different contents of Sc2O3(mol%, x = 0, 0.05, 0.10, 0.15, and 0.20) were prepared by the traditional solid-state reaction method. Scanning electron microscope(SEM) and X-ray diffraction(XRD) were used in the microstructural studies of the specimen, and the electrical properties were in…
Iron-catalyzed selective oxidation of 5-hydroxylmethylfurfural in air：A facile synthesis of 2,5-diformylfuran at room temperature
一个熨斗(III ) 在房间温度在空中催化 5-HMF 的选择氧化到 2,5-DFF 被开发。这条途径与好选择给 2,5-DFF 并且让步。另外，一个二拍子的圆舞过程在显著地高的底层集中为 2,5-DFF 的氧化被开发到 2,5-FDCA。这个工作不含糊地为生物资源的变换为新协议的发展作为便宜、地球丰富的催化剂表明铁的大潜力到增值化学药品。
The codes of matter and their applications
在周期表的元素是过去常与不同作文形成物质的积木。不过，它是为他们的存在和实际应用程序是明确的物质的性质。因为两个的复杂性，与异国情调的性质寻找材料的新班总是是挑战性的理论并且试验性的途径到目前为止发展了。这里，我们建议所有存在的事的三个无所不在、首要的属性收费(Q) ，旋转(S) 或旋转运动，和线性运动(K) 能被用来说明是或将为我们所知的事 / 材料和他们的性质的不同类型的形成。三个属性或原来的代码能生产能进一步生产六十代码的六主要代码。每代码代表的物理意思被开。由 60 代码组成的桌子作为物质的代码的性质的桌子被介绍。我们证明这些代码能被用作积木形成新性质和新材料。quasiparticles 的许多新类型和有 Q， S 和…
Wire-like nano-polyaniline deposited electrochemically in a reverse micelle electrolyte as a p H sensor
Wire-like polyaniline(PANI) films were successfully electrodeposited onto an indium tin oxide(ITO) substrate using a pulse galvanostatic method(PGM) in a reverse micelle electrolyte. The as-prepared PANI films were electrochemically analyzed by cyclic voltammetry and electrochemical impedance spectroscopy in 1 mol·L-1…
Crystal-oriented wrinkles with origami-type junctions in few-layer hexagonal boron nitride
理解层相互影响是利用为设备应用叠不同二维的材料形成的分层的 heterostructures 的关键。硼氮化物被表明了是与改进活动性造 graphene 设备的理想的底层。这里我们形态学和六角形的硼氮化物薄片在硅底层上扔了的退火的很少层的光反应上的现在的研究沿着明确的结晶的方向揭示线性皱纹的形成。皱纹在整个样品形成了首先三方面、偶尔四折的 origami 类型连接的一个网络，并且所有三方面的连接和皱纹沿着扶手椅形成了结晶的方向。而且，通过自发的对称碎，产出的分子的动力学模拟起皱与试验性的结果和建议合拢 origami 一致的连接形态学当模特儿。我们的调查结果显示这形态学可以是在合适的压力紧张条件下面的几二维的材料的一个一般特征，在…
In vitro Response of Human Mesenchymal Stromal Cells to Titanium Coated Peek Films and Their Suitability for Magnetic Resonance Imaging
Medical imaging is an important tool for the post-operative checkup of an accurate position of an implant as well as for monitoring the integration in the adjacent tissue that may influence the success of a medical device.Unfortunately,the possibility to use imaging methods is associated with the implant material and…
Effects of the flow rate of hydrogen on the growth of graphene
有不同形态学的 Graphene 样品被低压力化学药品蒸汽免职在铜围场的里面上制作并且调节氢的流动率。氢的流动率极大地影响 graphene 的生长，这被发现。热力学的分析显示氢的更高的流动率对有常规形态学的好优秀 graphene 的形成有利。然而，甲烷的集体转移的过程统治生长驱动力。在很低的压力，集体转移作为氢增加的流动率由 Knudsen 散开，和甲烷减少的集体转移的流动继续，在生长驱动力导致减少。在一个更高的压力，集体转移由 Ficks 散开，和甲烷的集体转移的流动继续被煤气的速度统治，其变化决定 graphene 的生长驱动力变化。