Materials Literature
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During the past few years considerable interest in ultrasmall gold nonoparticles (usNP) was expressed. Due to their unique electronic properties, NP are promising candidates for applications in molecular electronics, catalysis, photovoltaics, or biolabeling. These properties are in a transient regime between molecule…
Application of polymers in novel and advanced scientific technologies is increasingly expanding. In this regard, optical polymers among different materials have found a special and unique position. A novel dye doped polymer thin film was prepared by taking advantage of dye molecules' interaction with the host environm…
In the modern world of rapid development of scientific and innovative technologies it is impossible to imagine any industry without using laser technology. Such a universal tool as laser can be used by many modern technologies, one of which is Rapid Prototyping technology, widely used in highly developed countries all…
The dependence of the quantities rotational moment upon the size and cross-sectional NiTi wires at the beginning tooth rotation process. A comparison of experimental data with theoretical values. Registered values of the relaxation phenomenon rotational moment in time.
Organic light emitting diodes(OLEDs) were fabricated using 5 wt.% cesium carbonate(Cs2CO3) doped 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP) as eletron-injection layer and 20 wt.% molybdenum oxide(MoO3) doped N,N’-Bis(naphthalen-1-yl)-N,N’-bis(phenyl)-benzidine(NPB) as hole-injection layer,respectively,and the…
Au cours des deux dernières décennies, il y a eu un intérêt accru pour la recherche de nouveaux dispositifs de type capteurs pour la détection de très petites quantités de molécules, par exemple, d'intérêt biologique. Les critères importants de tels capteurs sont principalement la grande sensibilité et la sélectivité.…
Physical characteristics, such as heat, conductivity and others, in principle, one can always express by the Green’s function. However, the relationship is often very complex and “one-sided” because it does not allow to recover the Green’s function from experimental data. It is therefore of interest to discuss methods…
A single-molecule magnet placed in a magnetic field perpendicular to its anisotropy axis can be truncated to an effective two-level system, with easily tunable energy splitting. The quantum coherence of the molecular spin is largely determined by the dynamics of the surrounding nuclear spin bath. Here A. Morello, A. M…
采用高温固相法制备了一种新型的白光LED用Ca3Si2O4N2∶Eu2+,Ce3+,K+荧光粉。利用X射线衍射仪对样品的物相结构进行了分析,结果表明:Ce3+和K+离子的掺杂没有改变Ca3Si2O4N2∶Eu2+荧光粉的主晶相。利用荧光光谱仪对样品的发光性能进行了测试,发现样品在355 nm激发下得到的发射光谱为峰值位于505 nm的单峰,是Eu2+离子5d-4f电子跃迁引起的。Ca3Si2O4N2∶Eu2+荧光粉通过Ce3+和K+离子的掺杂,发光明显增强。当Ce3+的摩尔分数为1%时,荧光粉的发光强度达到最大值,是单掺Eu2+离子荧光粉发光强度的168%。通过光谱重叠的方法计算Ce3+→Eu2+能量传递临界的距离为2.535 n…
NOx dannelsen i forbrenning er en komplisert prosess. Den kan bli kategorisert i tre mekanismer; termisk NOx, hurtig NOx og NOx fra nitrogenforbindelser i drivstoffet. Betydning av mekanismene i denne rapporten er henholdsvis. Forbrenning av hydrogen gir høyere flammetemperaturer som igjen kan føre til mer produksjon…
以H3PW12O40／ZrO2-WO3为催化剂，以丁酮和乙二醇为原料合成丁酮乙二醇缩酮。探讨H3PW12O40／ZrO2-WO3对缩酮反应的催化活性，较系统地研究了酮醇物质的量比、催化剂用量、带水剂用量、反应时间等因素对产物收率的影响。实验表明：H3PW12O40／ZrO2-WO3是合成丁酮乙二醇缩酮的良好催化剂；在凡（丁酮）：n（乙二醇）=1．0：1．5，催化剂用量占反应物总质量1．0％，环己烷（12mL）为带水剂，反应时间为75min的最佳条件下，丁酮乙二醇缩酮的收率可达79．1％。
This thesis centers on the design of patchy particles and their self-assembly into ordered structures. Patchy particles have a patterned surface consisting of sticky and repulsive patches. These patches can be exploited to arrange the particles into ordered structures. In this thesis, the patchy particles are formed u…
Представлены некоторые результаты моделирования наноразмерных объектов в рамках подходов механики сплошных сред и конструкций. Обсуждаются исследования наноструктур, состоящих из множества одинаковых наноэлементов, основанных на измерении собственных частот. Рассматриваются упорядоченные ориентированные массивы нанооб…
Les objectifs de ce travail de these concernent le developpement de composites polymeres conjugues/nanotubes de carbone (NTC) et l’etude de leurs proprietes electriques. En effet, du fait de leur taille nanometrique et de leurs priorites electroniques originales, les nanotubes de carbone apparaissent comme tres promet…
采用液相预处理和固相反应相结合的方法合成了聚阴离子型锂离子电池Li2Fe1-xVxSiO4/C（x=0,0.1,0.3,0.5）复合正极材料,采用XRD、SEM、EDX和电化学测试对材料进行了表征,研究了钒掺杂对材料结构、形貌和电化学性能的影响。结果表明所有样品均为正交晶系,属P21mn空间群,钒掺杂量x=0.1时样品晶格常数发生明显变化,晶胞呈c轴方向拉长的立方体,导致了材料的比容量和循环性能下降;所有样品均为纳米至亚微米尺寸颗粒,且随钒掺杂量的增加而增大,但x=0.5时样品的电化学性能最优。在常温和0.2C倍率下初始放电容量为124.3mAh/g,循环10次后容量无衰减,可逆放电容量仍高达126.2mAh/g,显示了良好的循环…
Organic inorganic compounds constitute a vast family of hybrid materials of considerable technological importance. Indeed, due to the nature (molecular, ionic, hydrogen bonding, etc...) of organic and inorganic components, many combinations may be achieved to elaborate suitable materials, so as to exhibit some interes…
The application of ultrasounds (US) in dyeing and washing at industrial scale has become an important research topic in the recent years, as this technology appears to have a high potential to reduce the environmental impact of textile productions, as well as to increase the effectiveness of these basic operations. As…
In this research, a braiding-pultrusion production line is developed by modifying a conventional textile maypole braiding machine and adding it to a pultrusion line for production of braid-pultruded (BP) composite rods. In order to evaluate the mechanical properties of BP rods and study the effect of some braiding par…
聚乙烯吡咯烷酮是一种具有优异的化学稳定性、低毒性、生物相溶性的水溶性高分子。采用活性可控聚合方法和原子转移自由基聚合法制备聚乙烯吡咯烷酮，利用基质辅助激光解吸电离飞行时间质谱仪（MALDI—TOF—MS）和凝胶渗透色谱法（GPC）分析聚合物的分子量和分子量分布，并比较两者在分析聚合物分子量中的差异。研究表明MALDI—TOF—MS方法可直观分析PNVP分子链段的结构和重复单元的信息，该方法测定聚合物的分子量与GPC测定的分子量相比偏小，造成这种现象的主要原因是分析过程中存在离子歧化现象。
Oligonucleotide-conjugated bio-hybrid nanomaterials with a dense DNA layer on the surface have been shown to possess extraordinary selectivity and sensitivity for DNA detection as well as promising results as delivery agents, as demonstrated with the exceptional example of polyvalent oligonucleotide-conjugated gold na…