Materials Literature
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Kinetic study of the temperature effect on the quenching of the N2(a1Πg) and N2(a′1Σu−) states in pure nitrogen and the quenching of the N2(a1Πg) state by molecular oxygen in N2–O2 mixtures, Ledru, G, Rodriguez-Akerreta, P, Marchal, F
Insulin has been extensively studied since it was discovered by Banting and Best in 1921. Early in 1934, Dorothy Crowfoot and John Desmond Bernal obtained the first X-ray diffraction photograph of an enzyme protein: pepsin. In 1935, they took another photograph of a protein hormone: insulin. The chemical structure of…
通过原子转移自由基聚合合成了线形及三臂聚苯乙烯-b -聚2(5)-乙烯基对(间)苯二甲酸二钠嵌段共聚物,通过凝胶渗透色谱、核磁共振和热失重表征证实得到了结构明确、分散度较窄的嵌段共聚物成核剂.采用熔融共混的方法制得聚对苯二甲酸乙二酯(PET)与成核剂共混样品.采用差示扫描量热仪与一维X射线衍射仪研究了PET及添加成核剂后PET的非等温结晶过程,对不同结构和组成成核剂的成核效果进行对比研究,结果表明所合成的一系列共聚物都能有效改善PET结晶过程,同时还能有效保持PET分子量.
The integration of carbon nanotube (CNT)-based sensor and readout complementary metal-oxide-semiconductor integrated chip (CMOS IC) to detect hydrogen gas in a single chip is presented. First, we have fabricated the CMOS IC using the standard 0.35-μm CMOS process. Then, we have built 8 × 8 CNT-based sensor cells on it…
Calibration and exploitation of failure criterion is at present a challenging field in the structural integrity scenario. Calibrated failure criteria allow the simulation/reproduction of damages using virtual approach and eventually further assessment of the residual integrity of the components. Therefore the increase…
This article deals with the development of functional graded materials which is pursued by the collaborative research centre Transregio 30. The functional gradation is produced by a thermo-mechanical production process and is characterized by different fracture mechanical specific values. Because cracks are by all mea…
Epoxy resins were materials with excellent mechanical, electrical properties and good chemical stability. Thus, they had been used in various fields, especially in electrical and electronic application. However, because they were brittle material, the fields of application were limited. Adding nano-Aluminum Nitride (A…
Abstract This article describes the results of a study of Cu/Ni multilayer coatings applied on a monocrystalline Si(100) silicon substrate by the deposition magnetron sputtering technique. Composed of 100 bilayers each, the multilayers were differentiated by the Ni sublayer thickness (1.2 to 3 nm), while maintaining t…
In order to carry out precise measurements of the thickness of a dielectric layer deposited on a metal surface two-dimensionally, we have introduced an ellipsometric measurement technique (EMT) to a new modified Otto configuration (MOC) that is used for observing surface plasmon resonance (SPR). In the conventional MO…
Rupture dynamics in reinforced elastomers is a much more complex process than in pure elastomers due to the intrinsic heterogeneous mixture of a rubber matrix with filler particles at submicronic scale. In the case of natural rubber, an additional source of heterogeneity is the strain-crystallization effect. How ruptu…
Bulk Na 2 O–BaO–PbO–Nb 2 O 5 –SiO 2 glass-ceramic dielectrics in considerable size (about 200 × 100 × 5mm 3 ) were prepared via controlled-crystallization route. The dielectric properties (including the permittivity and the loss tangent) of the bulk dielectrics were investigated. The results show that the capability o…
Presently, one of the most interesting approaches to the generation of H 2 is based on sulphur-based cycles, that however require structural components able to work in a corrosive environment at high temperature. Silicon carbide (SiC) is one of the most promising materials for this application, and to increase its lim…
Purpose: Applications for highly corrosive environments and cyclic loading are often made out of austenitic stainless steels. Corrosion fatigue and crack propagation behaviour has been studied to determine failure processes and damage mechanisms. Approach: CrNiMo stabilized austenitic stainless steel and CrMnN austeni…
Synthesis of thiophenophanes with ethyne and ethene spacers has been achieved by
This paper studies a dynamical stability of the steady state for some thermoelastic and thermoviscoelastic systems in multi-dimensional space domain.More general nonlinear term can be taken here than the one in [6] which studiedthe stability for the one-dimensional system called the Falk model system.We also give appl…
Increasing the synthesis scale is one of the most important issues in nanocrystal synthesis. The main difference between small and large reactor is their thermal transfer rate which is reported to have great effects on particle nucleation and growth. In this paper, CdSe Quantum dots synthesis as was used as a model to…
Poly(methyl methacrylate) (PMMA) microbeads are hybridized with fluorescent YVO 4 :Bi 3+ ,Eu 3+ nanoparticles using the layer-by-layer adsorption technique. The composite beads A are prepared by adsorbing negatively-charged YVO 4 :Bi 3+ ,Eu 3+ nanoparticles onto positively-charged PMMA beads modified with poly(allylam…
The breaking of symmetry is the ground on which many physical phenomena are explained. This is important in particular for bipartite lattice structure as graphene and carbon nanotubes, where particle-hole and pseudo-spin are relevant symmetries. Here we investigate the role played by the defect-induced breaking of the…
A linear zone plate named multilayer laue lens (MLL) is fabricated using a depth-graded multilayer structure.The lens shows considerable potential in focusing an X-ray beam into a nanometer scale with high efficiency.In this letter, a depth-graded multilayer consisting of 324 alternating WSi2 and Si layers with a tota…
The vibrational spectrum of hydrogen and the parameters of H jump motion in the rhombohedral Th(2)Zn(17)-type compound Ce(2)Fe(17)H(5) have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ce(2)Fe(2) sites participate in the fast localized j…