Materials Literature
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Adhesion, spreading, proliferation, and collagen matrix production of human bone marrow stromal cells (BMSCs) on an RGD-modified silk matrix was studied. Anterior cruciate ligament fibroblasts (ACLFs) were used as a control cell source. Scanning electron microscopy (SEM) and MTT analyses demonstrated that the modified…
We report conductivity measurements of Cr-doped V2O3 using a variable pressure technique. The critical behavior of the conductivity near the Mott insulator to metal critical endpoint is investigated in detail as a function of pressure and temperature. The critical exponents are determined, as well as the scaling funct…
Abstract Needle‐like ZnO nanowires with high density are grown uniformly and vertically over an entire Ga‐doped conductive ZnO film at 550 °C. The nanowires are grown preferentially in the c ‐axis direction. The X‐ray diffraction (XRD) θ‐scan curve shows a full width at half maximum (FWHM) value of 2°. This indicates…
Abstract By simply changing the molar ratio of the dopant to monomer, the morphology of salicylic acid (SA)‐doped polyaniline (PANI) can be changed from one‐dimensional nanotubes (∼ 109–150 nm in diameter) to three‐dimensional hollow microspheres (∼ 1.5–3.1 μm in diameter) via a self‐assembly process. Freeze–fracture…
Free‐standing metal foam structures with nano‐dendritic walls of copper and tin are fabricated by an electrochemical deposition process. This unique structure is attributed to the concurrent generation of hydrogen bubbles with extremely fast metal deposition at high cathodic current densities. The Figure shows a typic…
Tissue engineering aims at resolving problems such as donor shortage and immune rejection faced by transplantation. Scaffolds (artificial extracellular matrices) have critical roles in tissue engineering. Recently, we developed nano-fibrous poly(L-lactic acid) scaffolds under the hypothesis that synthetic nano-fibrous…
Abstract Mechanical attrition, mechanical alloying and other methods of extreme plastic deformation (high pressure torsion, equal channel angular pressing) have been developed as versatile alternatives to other physical and chemical processing routes in preparing nanophase materials. Here several examples are discusse…
Abstract Structural evolution process in crystalline phase transition, isothermal crystallization from melt and solvent‐induced crystallization has been investigated for crystalline polymers on the basis of the time and/or temperature dependence of small‐angle X‐ray scattering (SAXS), wide‐angle X‐ray scattering (WAXS…
The microstructure and electrical characteristics of $Pr_{6}$ $O_{11}$ -based ZnO varistor ceramics composed of $ZnO-Pr_{6}$ $O_{ 11}$ / $-CoO-Cr_2$ $O_3$ - $Dy_2$ $O_3$ -based ceramics were investigated with $Dy_2$ $O_3$ content in the range of 0.0∼2.0 mol%. As $Dy_2$ $O_3$ content was increased, the average grain si…
Abstract The crystal structures of clathrate forms of syndiotactic poly( m ‐methylstyrene) containing guest molecules having different steric hindrance (CS 2 , benzene and orto ‐dichlorobenzene) are presented. The structures are all characterized by polymer chains in s (2/1)2 helical conformation and guest molecules p…
A model has been developed for calculating the hydrogen solubility in steel on the basis of composition (S, Ti, B) and grain size, with the objective of improving the control of hydrogen content in steel products. The effects of sulphur are in agreement with previous experience, but complex effects have been observed…
Abstract The current research on grain boundary dynamics in metals is reviewed. The boundary dynamics, i. e., the boundary reaction to applied forces, is strongly dependent on the grain boundary character, which is commonly reduced to the orientation relationship between adjacent grains and impurity segregation at the…
The structure of zirconium-base alloys with metals of V-VIII groups of the Periodic Table, quenched from high temperature p-phase region, was studied. X-ray diffraction analysis, light microscopy, and transmission electron microscopy were used in this investigation. It was found that the orthorhombic a-phase is formed…
Spent railway ballast is a source of recycled aggregate. Recycling of aggregates contributes to sustainable development by reducing the volume of construction waste going to landfill, reducing transportation and reducing the impact of primary mineral extraction supplying primary aggregates. Railway ballast is renewed…
A study has been made on the effect of the presence of grafted acrylic layers on the autoadhesion of polyethylene. Methyl methacrylate (MMA), ethyl methacrylate (EMA), methyl acrylate (MA), ethyl acrylate (EA), and butyl methacrylate (BMA) were grafted onto high density polyethylene (HDPE). The grafting reaction was f…
Abstract Weight‐loss tests and electrochemical techniques are used to study the inhibition of BTA and Na 2 MoO 4 either individually or in different combinations for carbon steel in boiling 10.24 mol/L LiBr solution containing 0.07 mol/L LiOH. The result indicates the corrosion of carbon steel is effectively inhibited…
We observe the intermittent motion of a single planar twin boundary under a constant shear stress in organic crystals (TMTSF) 2 PF 6 . The boundary is forced to shuttle repeatedly in a specific region of a single crystal. For each move we measure the residence time t res at a certain trap as well as the local velocity…
The structure of titanium-base alloys with d-metals of V-VIII groups of the Periodic Table, quenched from high temperature p-phase region, was studied. X-ray diffraction analysis, light microscopy, and transmission electron microscopy were used in this investigation. It was established that the β-stabilising action of…
Abstract Melting behavior of semicrystalline poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride‐ co ‐hexafluoropropylene) is investigated as a function of supercritical CO 2 pressure using a Linear Variable Displacement Transformer (LVDT). The melting temperature ( T m ) of both polymers is lowered due to s…
The low-temperature martensitic transformation of pure lithium is characterized by a complex phase diagram exhibiting the coexistence of several close-packed phases with the bcc matrix. On cooling, below the martensitic start temperature a long-range ordered 9R structure and a one-dimensionally disordered polytype pha…