Materials Literature
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以二茂铁二甲酸为原料,经酯化、部分水解、与叠氮化钠反应、在叔丁醇中发生Curtius重排得到1'-甲酸甲酯-1-叔丁氧胺基二茂铁(5),5经三氟乙酸脱保护、与(Z)-2-苯基-4-苯甲基噁唑-5-酮反应,合成了含α,β-不饱和氨基酸残基的二茂铁-肽缀合物CH3O-Fc-NH-ΔPhe-COPh(7)(ΔPhe为α,β-不饱和苯丙氨酸).用红外、核磁、质谱和元素分析对其结构进行鉴定和表征.用循环伏安(CV)法对产物的电化学性能进行研究,结果表明化合物7的氧化峰和还原峰的电位分别为0.802和0.714 V,峰电位之差ΔEp为88 mV,峰电流密度之比Jpa/Jpc为1.06.用荧光光谱研究了近生理条件下化合物7与牛血清白蛋白(BSA…
The thin-lens beta-ray spectrometer is described, together with its associated equipment. The energies of gamma-rays, emitted by Radium in equilibrium with its disintegration products have been determined by measuring, in such a spectrometer, the energies of photoelectrons ejected from lead. These energies agree reaso…
采用化学共沉淀法制备了γ-Fe2O3／Ni2O3复合磁性纳米微粒，并用Massart法合成了γ-Fe2O3／Ni2O3复合磁性微粒的磁性液体。用振动样品磁强计（VSM）测量了磁性微粒及不同体积分数的磁性液体的磁化曲线。结果表明，磁性液体的饱和磁化强度与磁性液体中微粒的体积分数≠。、微粒表面的非磁性层以及基液的磁性有关；不同体积分数的磁性液体的饱和磁化强度实际测量值与相应的理论值吻合较好。由此可判断：γ-Fe2O3／Ni2O3复合磁性微粒较其它单相纳米微粒更适于合成磁性液体。
采用溶剂热法合成[Cu2L2]（L=2,4-dichloro-6-{[（2-hydroxyphenyl）amino]methyl}phenol）,并通过红外光谱、元素分析、X-射线单晶衍射进行表征。该化合物属于单斜晶系,P21/n空间群,晶胞参数：a=12.932 2（10）,b=5.083 2（4）,c=14.760 9（11）,β=96.069（7）°,V=1 241.7（11）3,Z=4,Dx=1.924 mg.m-3,μ=2.19 mm-1,F（000）=716,R[F2〉2σ（F2）]=0.175,wR（F2）=0.252。结构分析表明,配合物为具有手性对称的平面结构。
Carbon nanotubes (CNTs) are a fascinating material with a diverse set of electrical and mechanical properties. In particular, they exhibit either metallic or semiconducting behaviour depending on their size and molecular configuration. This ability to tune their electrical properties makes CNTs applicable to a diverse…
In dieser Arbeit wurden die elektrischen und magnetischen Eigenschaften des verdünnten magnetischen Halbleiters (Ga,Mn)As untersucht. In Zusammenhang mit diesem Materialsystem wurden insbesondere folgende Themengebiete behandelt: magnetische Anisotropie, Valenzbandstruktur-Rechnungen, anisotroper Magnetowiderstand, Ma…
The impact of nano metal-oxides on human and environmental health is predicted to be increasing. Among metal oxides, nano ZnO (nZnO) is retained one of the most dangerous. Recently nZnO has invaded the market for its UV protective and antibacterial properties, that make it suitable for a wide range of application for…
制备了以N，N-（2-羟乙基）-2-氨基乙磺酸钠（BES—Na）为亲水扩链剂的磺酸型水性聚氨酯，采用FT—IR、DSC对水性聚氨酯的结构进行表征，并研究了BES—Na含量和NCO／OH值对水性聚氨酯乳液和薄膜性能的影响。研究表明：随着BES—Na含量的增加，乳液粒径分布区间变窄，平均粒径由237．3nm减小至61．2nm，薄膜的力学性能有较大提高，拉伸强度由16．07MPa增至24．67MPa，断裂伸长率由478．73％增至724．07％，硬度增大，吸水率由6．82％增至13．03％；随着NCO／OH值的增大，乳液粒径分布变宽，平均粒径由77．6nm增至335．7nm，薄膜拉伸强度由11．46MPa增至22．28MPa，而断裂伸长…
在还原性气氛下采用高温固相法合成了适合近紫外（λex=375nm）激发的光致发光蓝色荧光粉St2MgSi2O7：Eu2＋，Zr4＋，研究了NaF助熔剂对Sr2MgSi2O7：Eu2＋，Zr4＋荧光粉晶体结构、颗粒形貌及发光性能影响。结果表明：适量的NaF助熔剂有利于样品的晶化，所获得样品的颗粒形貌更加规整，能有效降低中间粒径（D50）并控制粒径分布；只含中间颗粒（D50）样品的发光强度高于含全颗粒样品的发光强度；NaF助熔剂最佳添加含量为6％（质量分数），可使样品的发光强度提高446％；掺杂适量的Zr4＋有利于样品的发光强度的提高，最后探索NaF助熔剂及掺杂Zr4＋离子提高发光性能的机制。
采用固相合成法制备Ce4＋掺杂ZnO-MgO-Al2O3-SiO2体系红外陶瓷材料,并通过XRD、IR和红外辐射测试等研究了样品的结构与红外辐射性能。结果表明：Ce4＋的引入可作为烧结助剂降低烧结温度,也可固溶于尖晶石结构中。随着Ce4＋含量的增加,样品的红外辐射性能明显增加;当CeO2添加量为0.08%,在12～15μm范围内,材料红外辐射率可达0.94。
Elastin-like polypeptides (ELPs) are a part of the family of responsive polymers. These polymers can be made to respond to a wide variety of stimuli, including temperature, pH, salt, concentration, light, and solvent. Elastin-like polypeptides are soluble in water at low temperatures but they become hydrophobic and in…
摘要：为探索适于中温条件下使用的固体氧化物燃料电池的阴极材料，利用溶液浸渍法，制备了具有阴极与电解质一体化离子传导路径的LnBaCo2O5＋δ-Lal0Si6O27（Ln=Gd，Sm，Nd）复合阴极。通过X射线衍射仪和扫描电子显微镜研究了阴极相结构、微观形貌。利用交流阻抗谱对电极的性能进行了研究。结果表明，SmBaCo2O55＋δ-La10Si6O24，复合阴极在空气中的界面极化电阻最小，700℃为0．518Ω·om^2。
The Flange-Midway types were found to be petrographically indistinguishable from ordinary sills. The cause of the bluish colour of Flange specimens could not be definitely established. The porphyries may have been altered both by deuteric and by hydro-thermal action. Studies of zoned plagioclases indicate a magmatic o…
This chapter explores the water vapour sorption properties of natural fibres and how this influences their mechanical properties. Despite having been studied intensively for over a century, water vapour sorption behaviour is far from being fully understood. This chapter explores some of the properties, but concentrate…
Many years have passed since « Many atom» showed what it was. The 26th of April 1986 will always remain the evil day for the mankind. Almost half of Ukraine’s territory suffered from extra contamination which mill affect every living being for thousands of years to come. According to official data the emergency fallou…
Single wall carbon nanotubes (SWNTs) are grown on quartz or silicon substrates using chemical vapor deposition technique. Electron beam evaporation forms a thin layer of gold (100nm) on the SWNTs on the growth substrates (quartz or silicon). The SWNTs and gold layer can be transferred to device substrates (silicon waf…
苯并三氮唑（BTA）作为性能优异地金属和气相防腐缓蚀剂而被广泛地应用到青铜保护.采用密度泛函理论（DFT）、概念DFT活性指数和Multiwfn波函数分析法等现代量子化学工具,计算和分析了BTA及高聚物膜[BTA-Cu（Ⅰ）]n中BTA-Cu（Ⅰ）单元的反应活性位点、反应前后前线轨道能和BTA分子反应结构;发现BTA和Cu（Ⅰ）可以发生成键反应,形成的高聚物膜[BTA-Cu（Ⅰ）]n较BTA单独分子在化学键长、键角和UV-Vis吸收峰上有明显地变化,并且从概念DFT的活性指数（主要为μ,η,ω,ΔEn,ΔEe）比较中发现,BTA-Cu（Ⅰ）的亲电性和亲核性较BTA有所增加,并计算了BTA-Cu（Ⅰ）单元分子间的相互作用能。
采用CO2气体保护堆焊方法,在Q235钢表面制备不同硼含量的Fe-C-Ti-Cr-B系堆焊层金属,利用扫描电镜（SEM）对堆焊层的组织进行了观察分析.在MLS-225型湿式橡胶轮磨粒磨损试验机上进行磨粒磨损试验,通过对磨损试样表面扫描电子显微镜观察分析并结合能谱成分分析探讨了磨损机理.结果表明,Fe-C-Ti-Cr-B耐磨堆焊合金中随着硼含量增加,基体组织逐渐细化,TiC颗粒数目增多且分布弥散均匀,但当硼含量增大至1.16%时,磨损面上大量碳化物剥落,抗磨损性能降低;当硼含量为0.55%时合金表现出优良的耐磨损性能,其耐磨性比未加硼的Fe-C-Ti-Cr系堆焊合金提高了3.7倍.
The use of materials is an important aspect in all aspects of life. Aerospace engineers strive to design structures that can stay longer in air, without the need to constantly conduct checks on the integrity of the structure. All these changes can only be made possible by evaluating different materials and how the imp…
在卤素离子存在下，考察了富马酸酮替芬一Ru（bpy）32’体系在金电极上的电化学及其发光行为。结果表明：Br-对富马酸酮替芬-Ru（bpy）32＋体系在金电极上发光行为具有显著的促进和增敏作用。据此，建立了一种高效、简便的富马酸酮替芬检测的新方法。在最佳实验条件下，富马酸酮替芬在1．0×10～～1．0×10μmol／L浓度范围内与相对发光强度呈线性关系，回归方程为I（counts）=1．73×10-5C＋188．15（R。=0．9989），检出限（S／N=3）为4．29×10-8moL／L，连续平行测定富马酸酮替芬溶液（1×10-5mol／L）6次，发光强度的RSD为4．7％。回收率在99．5％～105．0％之间，RSD为2．3％…