Materials Literature
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Abstract The molecular orientation in monolayer and multilayer films of fluorinated comb copolymers with various monomer ratios can be characterized by in‐plane and out‐of plane X‐ray diffraction (XRD), near‐edge X‐ray absorption fine structures (NEXAFS) spectroscopy at the C K‐edges, and atomic force microscopic obse…
This paper discusses the control of the foaming process for production of variable microcellular structures and morphologies for novel acoustical foams under investigation. For that purpose, the foaming process was controlled for production of foam samples with various microcellular structures. Crosslinked LDPE was us…
To develop liquid crystal displays suitable for moving picture, a liquid crystal display mode having an electrically tilted phase is proposed. This is realized by initially having a tilted liquid crystal with low bias voltage. We found that its measured response time is in good agreement with numerical calculation obt…
Abstract Diamond electrodes were prepared by MWCVD, using varying methane‐to‐hydrogen feedstock ratios to form both micro‐ and nano‐crystalline samples. Although Raman spectroscopy indicated substantial concentrations of non‐diamond carbon in the nanodiamond forms, XPS and ELS measurements confirm that the area‐averag…
We report a novel elasticity control technique for piezoelectric lead zirconate titanate (PZT) ceramics using an electric circuit that behaves as a "negative capacitor" (hereafter referred to as a negative-capacitance circuit) for application to sound shielding technology. A feature of this technology using an optimiz…
New results are obtained from an investigation of the formation processes of nanostructured material accompanying the heat treatment of silicate glasses containing lead sulfide dissolved during synthesis. Important morphological features of the material have been detected—close-to-monodisperse distribution of PbS nano…
The goal of this study was to synthesize Poly(DL-lactide-Co-glycolide) nanoparticles with entrapped magnetite, of under 100 nm in diameter, for future drug delivery applications. The emulsion evaporation method was selected to form poly(lactide-co-glycolide) (PLGA) nanoparticles with entrapped magnetite (Fe3O4) in the…
Heterojunctions were fabricated by depositing La0.9Sr0.1MnO3 (LSMO) films on 0.8wt% Nb-doped SrTiO3 substrates. Such heterojunctions showed good rectifying characteristics and clear photovoltaic effect. When the temperature increases from 50K to room temperature, the diffusion voltage (Vd) decreases from 0.77to0.22V a…
Abstract Molecular dynamics (MD) is used to investigate the structural and diffusive properties of interlayer species, namely water and counterion speciations, of Na-montmorillonite and Na/Mg-montmorillonite. It is found that Na/Mg-montmorillonite exhibits a higher swellability compared with that of Na-montmorillonite…
An experimental study of the B1-B2 transition is carried out in a bent-core liquid crystal. The study is essentially based on x-ray measurements as a function of temperature. The B1-B2 transition is extremely unusual and implies a deep structural change from a columnar phase to a lamellar phase. We have found that the…
Kinetics of the nucleus growth during a deep temperature quench across the isotropic to nematic phase transition was experimentally investigated for a siloxane‐azomethine polyether at cooling rates of 10 and 20°C min−1. Nematic droplets revealed in the optical images during the phase separation were treated statistica…
The crystal structures of (1- x )Pb(Zn 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PZN–PT: 0≤ x ≤0.3) in the cubic phase at 650 K have been investigated by analyzing the high-energy synchrotron-radiation (SR) powder diffraction data using the Rietveld method. It is found that the Pb atom does not settle at the ideal high-symmetry po…
Generally nanocapsules suspensions are a colloidal system in a metastable state, there is aggregation due to attraction and repulsion forces between particles. The objective of this work was to bring the role of the polymeric membrane in the protection of the active drug against damaging caused by external agents and…
Silver nanoparticles were synthesized by the reduction of silver nitrate with sodium borohydride at widely varied concentrations of the starting reagents. A physicochemical study of the synthesized nanosystems was carried out. The stabilizing ability of acid gelatin in the systems under study was considered. The stabi…
Ferroelectric thin films of Pb(Zr 0.3 Ti 0.7 )O 3 (PZT30) with different thicknesses were deposited on a Pt/Ti/SiO 2 /Si substrate by chemical solution deposition (CSD). The residual stress in the PZT30 thin films was estimated by the phonon mode shift of Raman scattering. The stress dependence of the optical phonon m…
Silver lithium niobate (Ag 1- x Li x NbO 3 , 0< x <0.1, ALN) single crystals were grown by a slow cooling method without flux under oxygen flow. By optimizing growth conditions, Ag 0.9 Li 0.1 NbO 3 (ALN10) crystals with sizes of ca. 30 mm cube were successfully grown in this study. The crystal symmetries in the ALN sy…
A Permian bentonite deposit at Melo, Uruguay is composed of a calcite-cemented sandstone containing clay pseudomorphs of glass shards (0-0.50 m) overlying a pink massive clay deposit (0.50-2.10 m). The massive bed is composed of two layers containing quartz and smectite or pure smectite respectively. The smectite is r…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. Sánchez Aké, R. Sanginés de Castro, H. Sobral, M. Villagrán-Muniz; Plume dynamics of cross-bea…
Phenomenological description of crystallization kinetics in a binary system "aqueous solution--solid solution" is given. This approach involves consideration of the true equilibrium and possible quasi-equilibrium states. It gives description of the crystallization kinetics close to equilibrium and features of the grow…
Trimetallic nickel dithiolene complexes with two tetrathiooxalate (tto) ligands were obtained by a reaction monitored by ESI-mass spectrometry followed by HPLC separation and were characterized by elemental or crystal structural analysis, MO calculations, and electrical conductivity measurements.