Materials Literature
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The degree of crystallinity of cellulose was used for assessing the degradation level of coated and uncoated samples of pine wood after weathering. X-ray diffraction (XRD) and Fourier Transform Infrared (FT-IR) spectroscopy measured the changes in the surface crystallinity of cellulose resulting from weathering, both…
Transparent electronic materials are increasingly in demand for a variety of optoelectronic applications, ranging from passive transparent conductive windows to active thin-film transistors. BaSnO${}_{3}$ is a semiconducting oxide with a large band gap of more than 3.1 eV. Recently, we discovered that BaSnO${}_{3}$ do…
Colloidal superparticles are nanoparticle assemblies in the form of colloidal particles. The assembly of nanoscopic objects into mesoscopic or macroscopic complex architectures allows bottom-up fabrication of functional materials. We report that the self-assembly of cadmium selenide-cadmium sulfide (CdSe-CdS) core-she…
Magnetometry and magnetic imaging with nitrogen–vacancy (NV) defects in diamond rely on the optical detection of electron spin resonance (ESR). However, this technique is inherently limited to magnetic fields that are weak enough to avoid electron spin mixing. Here, we focus on the high off-axis magnetic field regime…
A flexible solid-state asymmetric supercapacitor device with H-TiO(2) @MnO(2) core-shell NWs as the positive electrode and H-TiO(2) @C core-shell NWs as the negative electrode is developed. This device operates in a 1.8 V voltage window and is able to deliver a high specific capacitance of 139.6 F g(-1) and maximum vo…
International audience
The mechanism of superconductivity in pnictides is discussed through direct doping in superconducting FeAs and also in charge reservoir REO layers of SmFeAsO. The un-doped SmFeAsO is charge neutral Spin Density Wave (SDW) compound with magnetic ordering below 150 K. The Superconducting FeAs layers are doped with Co an…
The inelastic deformation behavior of the PMR-15 neat resin, a high-temperature thermoset polymer, was investigated at temperatures in the 274–316 °C range. The experimental program was designed to explore the influence of strain rate on monotonic loading at various temperatures. In addition, the effects of prior stra…
GaN Schottky barrier UV photodetectors (PDs) with a β-Ga 2 O 3 cap layer realized by furnace oxidation of GaN epitaxial layer were fabricated and characterized. With the cap layer inserted, it was found that the reverse leakage current could be reduced by more than 4 orders of magnitude and the UV-to-visible rejection…
Introduction Interest in pharmaceuticals, especially their benefits to human health and toxicology has a long history. Although the earliest activities were oriented toward benefits to health, it is also well known that there was substantial interest in the toxicology aspects of this field. As early as Roman times the…
A novel perylenetetracarboxylic diimide (PDI) derivative, N,N′-di(4′-benzo-15-crown-5-ether)-1,7-di(4-tert-butyl-phenoxy)perylene-3,4;9,10-tetracarboxylic diimide (CRPDI), has been synthesised and characterised. Dimerisation of CRPDI is induced by the presence of K+ in CHCl3 or spontaneously occurs in methanol, as rev…
Permalloy is used in a magnetically shielded room to inhibit the penetration of external magnetic field, etc. The flux density in permalloy used in the shielded room is of the order of a few mT or lower. In order to examine the performance of such a shielded room, the dc magnetic properties at low flux density is nece…
A first-time study of ESD characterization of atomically-thin graphene is reported. In a material comprising only a few atomic layers, It2 reaches 4 mA/μm for 100 ns and ∼8 mA/μm for 10 ns TLP or an equivalent current density of 2−3×108 A/cm2 and 4.6×108 A/cm2, respectively. The fact that failure occurs within the gra…
The electrical resistance of oriented graphitic carbon films supporting catalytic Pt pads decreases upon exposure to hydrogen gas with a magnitude dependent on the crystallographic order in the film. This resistance change is attributed to defects responding to atomic hydrogen spilled over from the catalytic Pt.
We have studied magnetic and magnetotransport properties of a polycrystalline ceramics of La0.7Sr0.2Ca0.1MnO3(LSCM) prepared from nanoparticles. The Curie temperature (TC) of the sample is about 340 K. Basing on the magnetic-field dependences of magnetization measured aroundTC, maximum magnetic-entropy changes under t…
This paper presents the application and verification of a dynamic vector-hysteresis model for nonoriented ferromagnetic materials. The hysteresis model is based on the fundamental principles of thermodynamics. Since the model is completely consistent with a genuine energy interpretation it can be considered from this…
Many of the commonly used high strength steels have small amounts of magnetostriction. This magnetostriction can be utilized, for example to measure the torque on a rotating shaft. Previous studies on the magnetostriction in high strength steels have ignored the internal anisotropies due to previous material handling.…
Abstract In this work, a one‐pot route to prepare emulsions of silica/polymer core‐shell composite particles was developed through the direct sol–gel processing of alkoxysilane on the surface of newly synthesized template polymer particles in emulsifier‐involved aqueous emulsions. It included two continuous steps: fir…
We describe here a facile two-step synthesis of hybrid nanocomposites based on one-dimensional carbon nanofibers (CNFs) decorated with cubic octasilsesquioxane (T8). The functionalization of CNFs with oxalyl chloride, via Friedel–Crafts acylation reaction in the presence of aluminum chloride, was first demonstrated as…
We show that patterned surfaces can promote bistable configurations of nematics for reasons other than the symmetry of the surface. Numerical and analytical calculations reveal that a nematic liquid crystal in contact with a striped surface is subject to the competing aligning influences of elastic anisotropy, differi…