Materials Literature
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The phase stability of the ${\mathrm{MgMn}}_{2}{\mathrm{O}}_{4}$ spinel has been studied by means of high-pressure x-ray diffraction for pressures up to 30 GPa. Two samples with different inversion degrees have been considered. Both spinels undergo a phase transition toward an orthorhombic structure (${\mathrm{CaMn}}_…
Zn 1 − x Mn x O layers with x varying between 0.006 and 0.22, have been prepared by metal-organic chemical-vapor deposition technique and analyzed by electron paramagnetic resonance spectroscopy. The layers show an exchange narrowed single line spectrum of Mn2+ ions; its temperature dependence demonstrates antiferroma…
Abstract Octa(maleimido phenyl) silsesquioxane (OMPS) was prepared from octa(aminophenyl) silsesquioxane (OAPS) and maleic anhydride. Initially, octaphenyl silsesquioxane was prepared, and it was nitrated to obtain octa(nitrophenyl) silsesquioxane; subsequently, reduction was carried out to obtain OAPS. These compound…
A solid-state growth technique is described for the preparation of misfit layered compounds [(Bi2Te3)x{(TiTe2)y}1.36] from preconfigured reactants that provide independent control of both x and y. A procedure for optimizing the structure of the preconfigured amorphous reactants is presented demonstrating the importanc…
ABSTRACT This paper presents a new method to determine both the magnitude and the sign of the surface stresses that develop as a consequence of sodium/hydrogen ion exchange in soda‐lime‐silicate glass immersed in water. At 90 °C, very thin layers that develop at the surfaces of polished glass specimens are found to ha…
We have studied the quantum confinement effect on Volmer–Weber-type self-assembled ZnO nanocrystals. Volmer–Weber-type self-assembled ZnO nanocrystals were grown on the Pt(111) substrate by using a rf-magnetron sputtering method and were confirmed by the Auger electron spectroscopy. The free exciton transition energie…
A long-lived charge-separated (CS) state, which can be observed even at 900 mus after laser excitation, has been attained in the formanilide-anthraquinone dyad (FA-AQ) in dimethyl sulfoxide, whereas the CS lifetime is shortened significantly to 20 ps in the ferrocene-formanilide-anthraquinone triad (Fc-FA-AQ). Such a…
Zn 1 − x Mn x O diluted magnetic semiconductor single phase thin films have been grown by the MOCVD technique. Depositions have been done on fused silica and (0001)-sapphire substrates. Layers on silica are polycrystalline with [001] preferential orientation, while Zn1−xMnxO films on c-sapphire are highly (0001) textu…
Ferromagnetic V-doped ZnO films were fabricated by the conventional pulsed-laser deposition technique on R-cut sapphire substrates from a ceramic target that was made by sol-gel method. All films are highly crystallized to be wurtzite. V-doped ZnO thin films grown at 600–650°C show room-temperature ferromagnetism alon…
Using poly(5-{[(4'-heptoxy-4-biphenylyl)carbonyl]oxy}-1-pentyne) as an example, we demonstrate the incorporative accommodation of the rigid polyacetylene backbones and the mesogenic pendants, which leads to a highly ordered smectic (Sm) phase with a frustrated structure. The polymer exhibits a recognizable sheetlike m…
Abstract This study reports the glass transition temperature ( T g ), and sorption and diffusion of subcritical CO 2 gas in polymethyl methacrylate (PMMA) nanocomposites containing organically modified smectite clay, Cloisite 20A (C20A). A range of methods for preparing the PMMA‐clay nanocomposites was investigated an…
Continuous product development and technology integration efforts using shape memory polymers (SMPs) have uncovered a need for faster response times. As with most smart materials, SMP responds to a specific stimulus. Traditionally SMP is triggered by thermal stimulus; increasing the temperature of the SMP above a Tg w…
Visible electroluminescence from silicon nanocrystals (Si-NCs) embedded in amorphous silicon nitride (a-SiNx) films has been observed. The Si-NC∕a-SiNx films were deposited by evaporating silicon from electron gun into the inductively coupled plasma of nitrogen. The density of Si-NCs in the a-SiNx matrix was around 10…
ABSTRACT The present work aims to provide evidence of corrosion‐induced hydrogen embrittlement of the aircraft aluminium alloy 2024. An extensive experimental investigation involving metallographic and fractographic analyses as well as mechanical testing was performed. The corrosion exposure led to a moderate reductio…
We report that Co0.1Ti0.9O2−δ prepared by the sol-gel technique is a paramagnet following the Curie–Weiss law: χ=χ0+C∕(T+θ) with θ≃5K. However, hydrogenation at 673 K in H2∕Ar(5%∕95%) gas converts a part of the paramagnetic (P) sample to room temperature ferromagnet (RTFM) and reheating the sample at 573 K in air conv…
Abstract Ethylene‐vinyl acetate copolymer (EVA)/montmorillonite (MMT) clay nanocomposites with varying degree of intercalation and exfoliation have been prepared using direct melt blending techniques with various degrees of polarity (9, 18, and 28 wt% vinyl acetate [VA]) and two different types of clay modification. M…
We have grown Mn-doped V2VI3 single crystals using the temperature gradient solidification method. We report on the structural and magnetic properties of Mn-doped Bi2Te3, Sb2Te3, Bi2Se3, and Sb2Se3 compound semiconductors. The lattice constants of several percent Mn-doped V2VI3 were slightly smaller than those of the…
A new class of photoactive chiral liquid crystals based on a photoactive nematic host material and a photoinactive chiral dopant was utilized to investigate the behavior of the blues phases when trans-cis isomerization is induced. While the general behavior follows what has been observed in the cholesteric phase, the…
The work reported in this paper aimed at exploring the advantages of using supercritical carbon dioxide (scCO 2 ) as an environmentally benign solvent and swelling agent for carrying out the grafting process of maleic anhydride onto polypropylene in the solid state. The effects of scCO 2 on the melting temperature and…
Room-temperature ferromagnetism has been observed recently in Co and Fe doped SnO2 powders. In Sn0.99Co0.01O2 powders prepared at 600 °C, ferromagnetism emerged following a sharp transition in the M vs H data at a critical field ∼25kOe. Broad susceptibility maxima were observed in ferromagnetic Sn1−xCoxO2 and Sn1−xFex…