Materials Literature
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The effect of Si and Ga substitutions on the magnetic and the magnetocaloric properties in Heusler based system Ni46Co4Mn38Sb12−xZx (Z = Si and Ga) has been studied. From the M(T) plots it is found that Si substitution stabilizes the austenite phase, whereas Ga substitution stabilizes the martensite phase. Strong meta…
A structural chameleon: A porous layered carbon material (PLC) containing nanographene domains was prepared by graphitizing glucose within the nanoscopic voids of an aminoclay template. The size of the pores in the PLC was altered reversibly by a mesoscale order–disorder transformation brought about by an applied mech…
The formation of an Y 2 O 3 -Yb 2 O 3 solid solution (8 mol % Yb 2 O 3 ) during the thermal decomposition of (Y,Yb) 2 (CO 3 ) 3 · 2H 2 O mixed carbonates obtained by coprecipitation from a nitrate solution has been studied by X-ray diffraction, thermal analysis, and optical microscopy. The results demonstrate that the…
Graded and nongraded FePt:C(hard)/Fe(soft) films with different structures are fabricated by magnetron sputtering and postannealing. Due to the interdiffusion between FePt and C layers during the annealing process, films with a continuous variation in anisotropy are realized by varying the C concentration in the FePt…
We investigated thermoelectric properties for polycrystalline oxypnictide LaFePO 1- x F x and LaFeAsO 1- x F x . The temperature ( T ) and F-doping dependences of resistivity (ρ) and Seebeck coefficient ( S ) are quite different between these compounds. In contrast to a monotonic T dependence and an absence of large F…
By irradiating undoped ZnO and Ga-doped ZnO (GZO) films with electron cyclotron resonance Ar plasma, their electrical and optical properties have been modified. Both the carrier concentration and the Hall mobility increased with continuous irradiation in conductive ZnO films with a defect-rich crystalline lattice. Imp…
X-ray absorption spectroscopy (XAS) is an ideal technique for the investigation of the local structure in materials and in particular around dopant species in semiconducting crystals. This experimental technique permits the quantitative determination of structural parameters such as the bond distances and number of ne…
Kinetically Constrained Models (KCMs) have been widely studied in the context of glassy dynamics, focusing on the influence of dynamical constraints on the slowing-down of the dynamics of a macroscopic system. In these models, it has been shown using the thermodynamic formalism for histories, that there is a coexisten…
As local gene therapy has received attention, immobilizing functional gene onto irregular oral implant surface has become an advanced challenge. Electrostatic layer-by-layer (LBL) assembly technique could achieve this goal and allow local and efficient administration of genes to the target cells. In this study, multil…
Measurements of d33* (major and minor loops) and d33 (major loops) were made on three Fe81.6Ga18.4 (Galfenol) highly textured polycrystalline rods, one of which had a small amount of 1002 steel substituted for the iron. Seven ΔT’s between ±25 and ± 0.5 MPa at 100 Oe were used for the minor loops. These measurements ar…
The technique of beam optics is applied to the description of the wave function of Dirac electrons. This approach is illustrated by considering electron transmission through simple nonhomogeneous structures, such as flat and bent p-n junctions and superlattices. We found that a convex p-n junction compresses the beam…
The structure and magnetocaloric properties of polycrystalline (Gd12-xTbx)Co7 (x=0, 4, and 8) alloys with Ho12Co7-type monoclinic structure have been investigated. A spin reorientation transition occurs at about 123 K for the alloy with x=0. The peak values of magnetic entropy change −ΔSM under a magnetic field change…
Abstract This study determines the diffusivity of nitrogen as a function of its concentration in polypropylene at 170, 180, and 190°C in the range, 0.99–6.75 MPa. Isothermal pressure decay experiments are utilized to obtain the uptake of nitrogen by polypropylene with time. These data when used with a detailed mass tr…
The electronic and optical properties of the KTaO${}_{3}$/SrTiO${}_{3}$ heterointerface are analyzed by the full-potential linearized augmented plane-wave approach of density functional theory. Optimization of the atomic positions points at subordinate changes in the crystal structure and chemical bonding near the int…
Abstract A new‐type of dicarboxylic acid was synthesized from the reaction of 2,5‐bis(4‐aminobenzylidene)cyclopentanone with trimellitic anhydride in a solution of glacial acetic acid/pyridine (Py) at refluxing temperature. Six novel heat resistance poly(amide‐imide)s (PAIs) with good inherent viscosities were synthes…
Abstract Highly branched polyurethane (PU) scaffolds that match mechanical properties are the preferred tissue engineering materials, which is composed of a multi‐hydroxyl‐terminated poly(butadiene‐co‐acrylonitrile) (THTPBA) prepolymer and poly(ethylene glycol) (PEG) via 1,6‐hexamethylene diisocyanate as anchor molecu…
Abstract Potato starch sulphate (PSS) was synthesized by the reaction between potato starch and sulphuric acid in ethanol. In order to obtain the products with high degree of substitution (DS), the reaction conditions which could influence the DS were optimized, including $m_{{\rm St}} /V_{{\rm H}_{2} {\rm SO}_{4} } $…
We report the use of molecular combing as an alignment method to obtain macroscopically oriented amyloid fibrils on planar surfaces. The aligned fibrils are studied by polarized infrared spectroscopy. This gives structural information that cannot be definitively obtained from standard infrared experiments on isotropic…
Tailored hierarchically structured (organo) silica beads with particle diameters between 0.3 and 2.5 mm have been prepared using an emulsion based sol−gel approach. Poly(propylene oxide)-poly(ethylene oxide) triblock copolymers as surfactants, aniline or 1-butanol as solvent and different silanes such as tetraethyl si…
Abstract Biology implements intriguing structural design principles that allow for attractive mechanical properties—such as high strength, toughness, and extensibility despite being made of weak and brittle constituents, as observed in biomineralized structures. For example, diatom algae contain nanoporous hierarchica…