Materials Literature
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Exchange bias (EB) and magnetic properties of ferrimagnetic (FI) Fe 3 O 4 and antiferromagnetic (AFM) Cr 2 O 3 nanocomposites prepared by mechanical alloying have been investigated. A large EB field of 2.2 kOe at 10 K is observed in one of the nanocomposites, which may be related to the uncompensated and pinned AFM sp…
The wearable wireless sensors powered with human body heat, which have been developed at IMEC and Holst Centre starting 2004, demonstrated that the power obtainable on the human body is large enough to power practical applications. The improving performance characteristics of the thermoelectric generators (TEGs) on hu…
Abstract Polycrystalline BiFeO 3 (BFO) thin films were successfully grown on Pt/Ti/SiO 2 /Si(100) and SrTiO 3 (STO) (100) substrates using the chemical solution deposition (CSD) technique. X‐ray diffraction (XRD) patterns indicate the polycrystalline nature of the films with rhombohedrally distorted perovskite crystal…
A tetranuclear cyano-bridged [{Ni(HL3)}{W(CN)8}]2 compound in a square geometry was formed by self-assembling of {W(CN)8}3- and {NiL3}2+ (L3=pentadentate ligand). The structure of the compound has been established by single crystal X-ray diffraction. The coordination sphere of the Ni ions is severely distorted with th…
The oxygen potentials of AmO 2− x were measured in the x range of 0.01–0.5 and the temperature range of 1000–1333 K by the electromotive force method. The oxygen potentials at 1333 K were −19.83 kJ/mol for x =0.019 and −319.1 kJ/mol for x =0.485, which were higher than those of CeO 2− x by approximately 200 kJ/mol for…
Abstract Polystyrene was treated by low‐pressure microwave‐excited ammonia plasmas to generate surface amino groups and subsequently treated with NO to label the remaining carbon radicals for in situ detection by XPS. Short time treatments between 5 ms and 40 s duration were used to vary densities of amino groups and…
Most of the insulating solids have in their structure point defects, naturally occurring or artificially created, which induce electronic states in the forbidden band. These defects are strongly related with the thermoluminescence (TL) phenomenon. There are several models described in the literature which explain the…
Nano‐ and microcrystalline yttria‐stabilized zirconia (YSZ) thin films with a dopant concentration of 8.3±0.3 mol% Y 2 O 3 were prepared with a variation in grain size by two orders of magnitude. A sol–gel‐based method with consecutive rapid thermal annealing was applied to fabricate YSZ films, resulting in about 400…
A planar film of gadolinia-doped ceria (GDC) was deposited on the (100) surface of an yttria stabilized zirconia (YSZ) single crystal substrate. Upon annealing, the film breaks up into an array of nanoislands (see figure) due to stress driven instability, providing an inexpensive route to the formation of ordered nano…
Model protein bovine serum albumin (BSA) was covalently grafted onto poly[(L-lactide)-co-carbonate] microsphere surfaces by "click chemistry." The grafting was confirmed by confocal laser scanning microscopy and X-ray photoelectron spectroscopy. The maximum amount of surface-grafted BSA was 45 mg x g(-1). The secondar…
Abstract To fabricate ferroelectric ultrathin polymer films with large dielectric constants for potential all‐organic electronic devices, ferroelectric polymer nanotubes and a composite of the nanotubes with a dispersed organic semiconductor have been fabricated by template‐assisted methods. The ferroelectricity drops…
An innovative approach is developed to electrospin Au polymer wires, dissolving HAuCl 4 salt in ethanol followed by addition of poly(acrylic acid) with several modifications in the conventional electrospinning system. The as-prepared Au polymer wires are assembled on the rotating drum in between the spinneret (+ elect…
We present a tight-binding study of the strong quantum confined Stark effect (QCSE) involving direct transitions in $\mathrm{Ge}∕\mathrm{Si}\mathrm{Ge}$ quantum wells. Our aim is to provide a theoretical and numerical description of the experimental results by Kuo et al. [Nature 437, 1334 (2005)] by means of a tight-b…
Vertically aligned perfectly hexagonal-shaped ZnO nanoprisms have been grown on a Si(100) substrate via a noncatalytic thermal evaporation process by using metallic zinc powder in the presence of oxygen gas. The as-grown nanoprisms consist of ultra smooth Zn-terminated (0001) facets bounded with the {0110} surfaces. T…
Abstract The thermo‐Raman spectra of synthesised α‐gallium oxyhydroxide nanorod prove that the transition of α‐gallium oxyhydroxide to β‐gallium oxide nanorods occurs above 350 °C but below 400 °C. Scanning electron microscopy proves that the morphology of the α‐gallium oxyhydroxide nanorods is retained upon calcinati…
The active magnetic regenerator (AMR) refrigeration system represents an environmentally attractive alternative to vapour-compression refrigeration. This paper compares the results of two numerical AMR models: (1) a 1D finite difference model and (2) a 2D finite element model. Both models simulate a reciprocating AMR…
Acentric vanadates: Three unique structure types of the vanadate-based mixed-metal oxide systems (salt)⋅MnII-VV-O and (salt)⋅CuII-VV-O are presented, with a focus on the role of the asymmetric vanadate units (yellow polyhedra). The two structure types found in the (AX)2M(VO3)2 series differ in the propagation directio…
The equilibrium atomic geometries of a $\text{Si}/{\text{SiO}}_{2}$ interface are studied by using first principles pseudopotential method within the density functional theory. The optical linear [reflectance differential spectra (RDS)] and nonlinear [second-harmonic generation (SHG)] spectra of the $\text{Si}/{\text{…
A recently developed method is used for the analysis of structures of planar disordered granular assemblies. Within this method, the assemblies are partitioned into volume elements associated either with grains or with more basic elements called quadrons. Our first aim is to compare the relative usefulness of descript…
Abstract Thermal decomposition process of cumene hydroperoxide (CHP) in cumene has been investigated by different researchers from chemical and kinetic point of view although its reactive characteristics have not yet been fully identified. The major discrepancy in the literature data is represented by different reacti…