Materials Literature
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We report a facile one-pot synthesis of hierarchically porous scaffolds, with independent control over nanoparticle mesoporosity and scaffold macroporosity. Our technique combines the chemistry of mesoporous silica nanoparticles with the control afforded by dynamic templating of surfactant mesophases. These materials…
X-band ESR spectra of zircon before and after heat treatment under oxygen rich atmosphere were measured with directions of the magnetic field applied in parallel and perpendicular to c-axis [001]. Seven peaks of Zeeman interaction were generated from the microwave energy absorptions due to the transitions between the…
Using the Taguchi method, the extraction of 1,10-phenanthroline and 2,2′-bipyridine from aqueous samples by a solid phase extraction system has been studied. The extraction is based on a new nanoporous CMK-1 modified with sodium dodecyl sulfate and Fe3+. The structural order and textural properties of the modified sor…
Fundamental understanding of dynamic behavior of polycrystalline ceramics is advanced through constitutive theory development and computational modeling. At the mesoscale, microstructures of silicon carbide grains (hexagonal crystal structure) or aluminum oxynitride grains (cubic crystal structure) are subjected to co…
The demand of lightweight structural materials is growing in automobile industry for energy saving. Magnesium alloy is one of the best candidates due to its low density. However, its low thermal stability and poor corrosion-resistant property against wear and environment limit applications of magnesium alloy. The main…
The flow and leakage characteristics of the air-curtain fume hood under high temperature operation (between 100°C and 250°C) were studied. Laser-assisted flow visualization technique was used to reveal the hot plume movements in the cabinet and the critical conditions for the hood-top leakage. The sulfur hexafluoride…
A total of 13 leaf extracts of coastal plants were used for the synthesis of silver nanoparticles and to test the antimicrobial potential of nanoparticles. The highest amount of nanoparticles was obtained by Sesuvium portulacastrum followed by Prosopis chilensis, Hibiscus rosasinensis and Clerodendrum inerme. The synt…
Phase equilibria in the Tl-TlI-S composition region of the Tl-S-I system were studied by differential thermal analysis, x-ray powder diffraction, and measurements of the microhardness and the emf of concentration circuits relative to a thallium electrode. A series of polythermal sections, an isothermal section at 300…
We investigate the self-organized growth of short TiO 2 nanotubes by complete anodization of Ti thin films deposited on Si substrates in ethylene glycol electrolytes with small addition of NH 4 F. During the anodization process, real-time inspection of the current transient is performed to anodize the Ti films complet…
使用简单的溶液共混的方法制备了氧化石墨烯/聚甲基丙烯酸甲酯(GO/PMMA)和表面官能化的石墨烯/聚甲基丙烯酸甲酯复合材料. 通过透射电镜(TEM), 扫描电镜(SEM)和原子力显微镜(AFM)观察了石墨烯及复合材料的表观形貌. 通过拉伸实验表征了其力学性能, 研究发现随着石墨烯的加入, 其拉伸强度和断裂伸长率都有所改善, 而且表面官能化的石墨烯的复合材料的改善效果要优于氧化石墨烯.
The solvent-induced morphological change of silver nanoparticles is studied with a combination of optical spectroscopy and atomic force microscopy (AFM). By using the local surface plasmon resonance (LSPR) spectroscopy arising from Ag nanoparticles, an in-situ investigation of the spectral changes is carried out befor…
General Atomics (GA) is developing a new nuclear concept called Energy Multiplier Module (EM2), which is a helium (He) cooled fast reactor with a net electrical output of 240 MW. It employs a “convert & burn” core design which converts fertile to fissile and burns it in situ over a 30-year core life. It can burn SNF f…
This review describes the major electrothermal methods for measuring the thermal conductivity of thin films in both cross-plane and in-plane directions. These methods use microfabricated metal lines for joule heating and resistance thermometry. The 3ω method for crossplane measurements is described thoroughly, along w…
In this study, we investigate the electrochemical properties of graphene-based capacitors using cyclic voltammetry (CV), constant charge/discharge cycling, and electrochemical impedance spectroscopy combined with an equivalent circuit. An easy route incorporated with modified Hummers' method and microwave-assisted red…
A new experimental method (IIC, Infrared Image Correlation) for quick assessment of the coefficients of thermal expansion of solid materials is presented. The proposed method is based on performing a digital image correlation between thermal images acquired at different temperatures by means of an infrared camera. It…
Magnesium phosphate cement (MPC) was modified by fly ash, silica fume and re-dispersible latex powder and the properties of modified MPC, such as fluidity, setting time and compressive strength, were tested. Based on the experimental results, the contents of 50% fly ash, 10% silica fume and 2% re-dispersible latex pow…
PEDOT:PSS buffer layers have been processed with the standard annealing step used for organic solar cells device applications. The d.c. conductivity σ as a function of temperature for two heating rates under He and atmospheric air was studied. Moreover, the stability of the conductivity was investigated at different t…
First-principle investigations of the elastic, electronic and thermodynamic properties of TiC in NaCl structure under high pressure are conducted by using the plane-wave pseudopotential method and quasi-harmonic Debye model. The obtained lattice parameters, elastic constants and moduli at p=0 GPa and T=0 K are in very…
The Bi and the Te nano-powders are prepared by inert gas protected evaporation-condensation method; the n-type Bi2Te3 bulk materials with nano-layer and twin crystallite sub-structures are then synthesized by mechanical alloying and spark plasma sintering technique. The effects of grain size and microstructure on ther…
In order to find how the external electric field affects the SiN molecule completely, in the present work the density functional B3P86/6-31(g) method is adopted to optimize the ground state structure and the time dependent density functional theory TDDFT/6-31(g) is used to study the absorption spectra, emission spectr…