Materials Literature
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In this paper, we provide a method for the simultaneous measurement of the inner diameter of nanotubes with a regular shape and calculation of their mean inner potential (MIP) using electron holography. This method contains 4 steps: (i)phase profile characterization from electron holography; (ii) shape assumption from…
We report the synthesis of undoped ZnO and Al-doped ZnO (ZnO:Al) nanowires grown using a two-step process: (a) preparation of the seed layer, and (b) growth of the nanostructures. In the first step, 10 mM solutions of zinc acetate dihydrate and 1-propanol were spin coated on polyethylene terephthalate (PET) substrate…
Purpose. Based on the experiment of the microarteriogenesis that is associated with angiogenesis during tissue repair process in porous silk fibroin films (PSFFs), we investigate the characteristics of micro-arteriogenesis and explore its mechanism. Methods. After the porous silk fibroin materials are implanted into t…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Ivan Kralov, Petko Sinapov, Krasimir Nedelchev, Ignat Ignatov; Friction induced rail vibrations.…
Burning velocity just after spontaneous ignition has been examined not only experimentally but also theoretically, as related to a Self-propagating High-temperature Synthesis (SHS) process, for a Ti-Al system. After varying the mixture ratio, the degree of dilution, and the compact and particle sizes, the spontaneous…
Crystalline silicon thin film solar cells, based on the epitaxial wafer equivalent, require a reflecting interlayer between substrate and active layers to increase the generated current and reach similar efficiencies as wafer based solar cells. With the epitaxial lateral overgrowth technique, a reflecting dielectric l…
The article presents a novel kinetic method for the solution of time-dependent source-driven linear transport problems. As will be discussed, the method is based on a multigeneration representation of linear Boltzmann equations and is derived from physically grounded considerations. The technique is said to be hybrid…
A large decrease is observed in the critical current density of YBCO coated conductors (CC) and related compounds when a strong perpendicular magnetic field is applied. While measurements are generally carried out at 77K only, here we present a magnetic technique permitting to determine the critical current per unit w…
Crystalline silicon solar cells with high ohmic emitters show higher efficiencies due to a better blue response. Unfortunately, the only way to contact them by screen printing is using the selective emitter technology. This study shows that contacting emitters with Rsh = 100 Ω/sq can be achieved by standard screen pri…
Copolymer based on triphenylamine (TPA) and 3,4-ethylenedioxythiophene (EDOT) is polymerized electrochemically. The structure, morphology and electrochemical properties of the obtained copolymer are investigated by cyclic voltammetry and FT-IR spectroscopy. The results confirm the copolymerization of TPA/EDOT. UV-vis…
The deformation and stacking of graphene significantly affect the overall electronic and mechanical properties. The graphene sheets are easily stacked each other due to van der Waals attraction. The folded characteristic may prevent graphene stacking and increase the d-spacing between graphenes. It can easily form den…
The electrical quality of the GeO 2 /Ge interface, prior to and after Gd 2 O 3 deposition, has been investigated as a function of the oxidizer (atomic O, O 2 , O 3 ) used for the GeO 2 based passivation of the Ge surface. In particular, the density of interface traps depends on the details of the Ge oxidation process…
A theory of X-ray acoustic resonance in the Bragg geometry is developed as applied to triple-axial X-ray diffractometry. In contrast to existing approaches, transverse ultrasonic oscillations propagating in the surface region of a crystal are considered in the model of a Rayleigh surface wave. Numerical simulation of…
Shock wave propagation in diamond along the [110] crystallographic direction was simulated by molecular dynamics (MD) using the reactive empirical bond order (REBO) potential. A new regime of shock wave propagation was observed involving split elastic-elastic shock waves for the range of piston velocities between 2.0…
We have synthesized several kinds of porous carbon material by template method using 2 kinds of natural allophanic soil purchased in Japan as template materials. To determine the hydroscopic properties of the templated porous carbon specimens, we measured their water adsorption and desorption isotherms around room tem…
The detection of flaws in steel pipes using Magnetic Flux Leakage (MFL) consists in detecting magnetic flux leaks outside the pipe, either with a magnetic sensor or with an induction coil, while the pipe is rotating. In the Vallourec group, many NDT units use MFL for testing ferromagnetic pipes. In order to improve th…
The results of phase relations investigation in bismuth-rich part of ternary Bi-Ga-Ni system are presented in this paper. Two sections with constant bismuth content equal to 80 and 90 at% were investigated experimentally using DSC and SEM-EDS methods and predicted thermodynamically by CALPHAD method. Calculated phase…
The adsorption of adamantane, adamantanol, thiocamphor, and sodium cryptate on electrodes of single-walled carbon nanotubes (SWNT) from dimethylsulfoxide (DMSO) solutions is studied by measuring the differential capacitance ( C ) vs. potential ( E ) dependences and cyclic voltammograms. In the tested systems, the high…
为了制备高性能的聚合物/蒙脱土纳米复合材料, 必须对蒙脱土(MMT)进行有机改性来改善蒙脱土表面的疏水性、提高蒙脱土与聚合物之间的相容性, 同时也需要尽可能地增大蒙脱土的层间距. 为此, 提出了一种采用不同链长的聚醚铵阳离子协同插层MMT 的新方法, 即采用D2000(或T5000)聚醚铵盐与D400 聚醚铵盐协同插层MMT, 并采用X射线衍射分析(XRD)和热重分析(TGA)研究了协同插层对改性MMT 的层间距、有机含量以及耐热性的影响. 另外, 也研究了插层过程中的搅拌方式和D400 聚醚铵盐多次插层对改性MMT 的层间距、有机含量等的影响. 研究结果表明,采用长链聚醚铵阳离子协同插层更有利于提高D400 聚醚铵盐改性MMT…
Ceramic solid solutions on the base of composition from morphotropic phase boundary 0.36BiScO3-0.64PbTiO3 modified by the powdered Bi4Ti3O12 and Bi0.75Sr0.25O1.36 single crystals additives and by the low-melting LiF additive in amounts 5, 10, and 1 wt.%, respectively, have been prepared by the solid-state reactions me…