Materials Literature
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We describe an approach to create nanoscale, functionalized channels in block copolymer films and demonstrate their use as templates for attaching filamentous actin (F-actin). Topographic and chemical patterns on the surface are created and controlled by exposure to UV-ozone (UVO) and reacting with an amine-terminated…
Abstract C 60 + sputtering was firstly used to determine depth profile of nitrogen in zinc oxide materials by time‐of‐flight (ToF) SIMS. Compared to traditional Cs + sputtering depth profiling, the C 60 + sputtering provides increase in signal intensity by a factor of over 200 and improves the detection limit by a fac…
An experimental study of the self-propagating high temperature synthesis of Mo–Si alloys was conducted from elemental powder compacts. Test specimens with seven compositions, including Mo/Si = 1∶1·25, 1∶1·50, 1∶1·75, 1∶2·00, 1∶2·25, 1∶2·50 and 1∶2·75 respectively, were employed. Experimental evidence showed that a com…
Tunable photophysical properties, high electron affinity, and solution processability, make colloidal quantum dots (QDs) useful for hybrid QD/polymer photovoltaic solar cells. However, the separately synthesized QDs are capped by a ligand, which hinders electron transport at the QD/polymer interface. A recently report…
The modes in a circular metallic waveguide loaded with a high permittivity dielectric rod may possess similar dispersion relations to the modes in the left-handed metamaterial (LHM) waveguide. Therefore such dielectric-loaded metallic waveguide may also support slow light with parameters properly selected. The slow li…
Abstract The hydrogen‐releasing activity of (LiNH2)6–LiH nanoclusters and metal (Na, K, or Mg)‐cation substituted nanoclusters (denoted as (NaNH2)(LiNH2)5, (KNH2)(LiNH2)5, and (MgNH)(LiNH2)5) are studied using ab initio molecular orbital theory. Kinetics results show that the rate‐determining step for the dehydrogenat…
The title compound, [PdCl(2)(C(6)H(16)N(3))](C(7)H(7)SO(3)), consists of a Pd(II) atom bonded to two N atoms of the 1,4,7-triaza-cyclo-nonane (TACN) ligand and two chloride ions, which define a distorted square-planar geometry. The third N atom of the TACN ligand is protonated and hydrogen bonds to the p-toluene-sulfo…
采用搅拌针置中(M4A4)、向镁合金侧偏置2 mm(M6A2)和向铝合金侧偏置2 mm(A6M2)3种焊接方式,研究了6 mm厚6061-T651铝合金和AZ31镁合金轧制板材的搅拌摩擦焊接.SEM及XRD分析表明,3种焊接方式均在焊接界面处发现Mg_(17)Al_(12)相的生成和由于共晶相熔化和随后冷却所形成的孔洞.在M4A4和M6A2样品中,少量的Al搅入到镁合金侧形成金属间化合物Mg_(17)Al_(12),而在A6M2样品中,少量的Mg搅入到铝合金中也形成金属间化合物Mg_(17)Al_(12),在Mg_(17)Al_(12)与基体的界面处存在微小孔洞.由于焊核区仅有少量的Mg_(17)Al_(12)生成,其硬度变化并不…
Dense CO2 can be used as an environmentally-benign polymer processing medium because of its liquid-like densities and gas-like mass transfer properties.In this work, polymer bio-blends of polycarbonate (PC), a biocompatible polymer, and polycaprolactone (PCL), a biodegradable polymer were prepared. Dense CO2 was used…
Purpose The purpose of this paper is to address the influence of deposition process parameters. The substrate heating mechanisms are also discussed. Design/methodology/approach Deposition duration, sputtering power, working gas pressure, and substrate heater temperature on substrate heating in the direct current (DC)…
针对汽车车身用Al-0.9Mg-1.0Si-0.7Cu-0.6Mn合金薄板,通过固溶、T4及退火处理控制其合金相组态,采用拉伸实验结合TEM/EDS观察研究了薄板在拉伸变形过程中的应变强化指数n值的变化规律及其应变强化行为.结果表明,Al-0.9Mg-1.0Si-0.7Cu-0.6Mn合金薄板的拉伸真应力-真应变不完全满足Hollomon公式,其对应于不同应变阶段的强化指数n各不相同;塑性变形早期,退火态合金薄板的应变强化效应最显著,塑性变形后期,固溶态合金薄板的应变强化效应最显著;拉伸变形任意应变范围内,固溶态合金薄板的应变强化指数n均高于T4态,其原因是固溶态合金薄板位错滑移的切应力明显小于T4态合金薄板.
Abstract Cesium (Cs+) and xenon (Xe+) sputter beams of energy ranging from 150 to 1000 eV were used to depth profile a 70 nm vitamin C layer spin‐coated on silicon wafer. We have shown that under Xe+ beam we were able to maintain the molecular information throughout the profile. In particular, the intensity of the dep…
Low cost ceramic dough moulding compounds/composites (CDMC) are composed of inorganic metal silicates and chopped fibre reinforcements. This paper investigates the fire reactions of these materials under severe thermal and heat conditions. This research is targeted to potential applications in the replacement of glass…
Abstract HVPE growth of a‐plane (11‐20)GaN was demonstrated. GaN growth was initiated from template GaN stripes, and each GaN stripes coalesced to get uniform crystal. At conventional growth temperature of 1000 °C, melt back etching was observed in GaN and surface morphology was poor. By lowering growth temperature to…
The hydration characteristics of C3S were studied in the presence of chromium (III) for up to 7 days. Chromium was introduced by either direct incorporation (as Cr2O3) during C3S preparation or during the subsequent hydration with a chromium (CrCl3) solution. Levels of Cr(III) used were 1 and 3% by wt. of C3S. The che…
Abstract In this work we report a systematic study of the electron and hole mobilities of GaNxAs1‐x alloys with different dopants (Zn, Te) and carrier concentrations (1017‐1019 cm‐3). We found a very slight reduction of the hole mobility in p‐GaNxAs1‐x compared to p‐GaAs, indicating that for small N contents (∼1.6%) t…
Abstract In order to investigate the merits of cluster bombardment for inorganic sputter depth profiling, thin (50‐nm) anodic Ta 2 O 5 films were analyzed by ToF‐SNMS using 25 keV Au n + projectile ions. The same focused primary ion beam was employed both for sputter erosion and (static) data acquisition. Sputtered ne…
Abstract Wetting behaviors and interfacial microstructures of molten Sn‐3.5Ag‐0.7Cu drops on micrometer‐ and nanometer‐grained Cu substrates were studied. The wettability of the micrometer‐grained Cu substrates was found to be better than that of the nanometer‐grained substrates. Moreover, Kirkendall voids were observ…
Purpose The purpose of this paper is to calculate the electromagnetic torque at a radius of an integration contour for which an optimal value is determined. Design/methodology/approach To analyze electrical machine dynamics, the electromagnetic torque should be precisely determined. This paper presents a method for ca…
A detailed study on the relaxation mechanisms of higher cage fullerene sizes is done as a prerequisite for studies of the influence of the endohedral structures on fullerene cage carbon relaxation. Recent studies of the dynamic behavior of C(60) and C(70) in aromatic solvents and CS(2) solution show the influence of t…