37 Result(s)
within
X. X. **e
Materials Science
Materials Engineering
Nanotechnology
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Article
Thermoresponsive copolymers based on synthetic porphyrin derivatives
Porphyrins and their derivatives may find a variety of applications in biomedical fields due to their interesting photochemical and photophysical properties. A tetraphenylporphyrin (TPP)-based methacrylate mon...
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Article
Toughening mechanisms of Ti3SiC2- and TiB2- toughened SiC matrix prepared via reactive melt infiltration
The SiC–Ti3SiC2–TiB2 composites herein were prepared in situ by reactive melt infiltration (RMI). The synergy mechanism between Ti3SiC2 and TiB2 on fracture toughness of SiC matrix was investigated. The phase com...
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Article
Self-assembly synthesis of AgNPs@g-C3N4 composite with enhanced electrochemical properties for supercapacitors
AgNPs@g-C3N4 composite was synthesized from Ag-containing sol and g-C3N4 powder by the ultrasonic-assisted self-assembly method. The composite has hierarchical pore size distributions, which will be beneficial to...
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Article
Size effects of micrometer-scaled metals—the search continues for materials containing real microstructures
Recent observations on strength and deformation of small metals containing microstructures, including dislocation patterns, grain boundaries, and second-phase precipitates are reviewed. These microstructures i...
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Article
Raman Studies of the Soft Phonon Modes in BaxSr1−x.TiO3 thin Films
The vibrational properties of barium strontium titanate thin films were studied by Raman spectroscopy in the temperature range from 5 to 300 K. The films were grown by pulsed laser deposition on SrTiO3 and LaAlO3
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Article
Assembly of Nanoparticles from Bioactive Peptides and Chitosan
Assembly of nanoparticles from bioactive peptides, caseinophosphopeptides (CPPs) and chitosan (CS) at physiological conditions and various CS/CPPs mass ratios have been systematically studied using a combinati...
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Article
Use of Quantum-Well Superlattices to Increase the Thermoelectric Figure of Merit: Transport and Optical Studies
The thermoelectric figure of merit(ZT) of a material is a measure the usefulness of the material in a thermoelectric device. Presently, the materials with the highestZT are Bi2Te3 alloys, withZT ≃ 1. There has be...
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Article
Facet-Facet Barrier on Surfaces: Proposal and Experimental Validation
Surface processing is generally kinetics limited. Migration barriers, both on flat surfaces and near steps, therefore are of crucial importance. In this paper, we describe a kinetic barrier that separates two ...
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Article
Growth of nanoscale BaTiO3/SrTiO3 superlattices by molecular-beam epitaxy
Commensurate BaTiO3/SrTiO3 superlattices were grown by reactive molecular-beam epitaxy on four different substrates: TiO2-terminated (001) SrTiO3, (101) DyScO3, (101) GdScO3, and (101) SmScO3. With the aid of ref...
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Article
Thermoelectric properties of epitaxial and topotaxial NaxCoO2 thin films
We report structural, electrical, and thermopower properties of epitaxial and topotaxial NaxCoO2 thin films on (0001) sapphire substrate. Topotaxial NaxCoO2 films were prepared by converting an epitaxial Co3O4 fi...
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Article
Polypyrrole-coated Large Deformation Strain Fabric Sensor and its Properties Study
Conductive-polymer coated fabrics have been investigated as intelligent materials in the past years. In this paper, a flexible fabric strain sensor coated with polypyrrole is reported, which is featured with h...
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Article
Amorphization of cristobalite at high temperature in vacuum
Amorphous transition behavior of silica polymorphs under high pressure has been extensively studied by using diamond-anvil cells or shock wave technologies at ambient temperature. Here, we report the amorphiza...
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Article
Multiple Layers of Copper Thin Films of Alternating Textures
In this paper, we present a preliminary study of texture development during copper thin film deposition. Using direct current (DC) magnetron sputtering technique, we deposit copper films on a SiO2/Si(111) substra...
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Article
Dislocations in SrTiO3 thin films grown on LaAlO3 substrates
The dislocation configurations in SrTiO3 thin films grown epitaxially on LaAlO3 (100) substrates were studied by conventional and high-resolution transmission electron microscopy. Misfit dislocations had, in most...
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Article
Creep behavior of in situ dual-scale particles-TiB whisker and TiC particulate-reinforced titanium composites
A titanium composite reinforced by in situ dual-scale particle, high-aspect-ratio TiB whiskers and fine TiC particulates was fabricated by a reactive hot pressing technique from a B4C–Ti system. The composite was...
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Article
Superplasticity in NiAl and NiAl-based alloys
Superplastic deformation was realized on NiAl and NiAl-based alloys prepared by both common casting and directional solidification. Directionally solidified NiAl–27Fe–3Nb alloy as well as conventionally cast N...
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Article
Cellular automaton model to simulate nucleation and growth of ferrite grains for low-carbon steels
A two-dimensional cellular automaton model was developed for the simulation of nucleation and growth of ferrite grains at various cooling rates in low-carbon steels. The model calculates the diffusion of the s...
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Article
Microstructure and misfit relaxation in SrTiO3/SrRuO3 bilayer films on LaAlO3(100) substrates
We studied the microstructure of SrTiO3/SrRuO3 bilayer films on (001) LaAlO3 substrates by high-resolution transmission electron microscopy. At the SrRuO3/LaAlO3 interface a defect configuration of stacking fault...
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Article
Oxidation Kinetics in SrTiO3 Homoepitaxy
Using an oblique-incidence optical reflectivity difference technique, we investigated kinetic processes in SrTiO3 homoepitaxy on SrTiO3(001) under pulsed laser deposition conditions. Depending upon growth tempera...
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Article
Superparamagnetic Behavior of Granular Co-C Films Consisting of Nanocrystalline Cobalt Encapsulated in Carbon
Nanocomposite Co-C thin films of about 15 nm thick were prepared by pulsed filtered vacuum arc deposition. The films were characterized by x-ray photoelectron spectroscopy, non-Rutherford backscattering spectr...
