Materials Literature
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The threshold characteristics U c (U ac ), q c (U ac )andq c (U c ), whereU c is the d.c. threshold voltage, U ac is a high-frequency orienting voltage with a frequency above 5000 Hz, and q c is the threshold wave number of the flexoelectric domains of Vistin'-Pikin-Bobylev, excited under the joint action of a d.c. vo…
Holographic gratings of different periods were recorded in the photopolymer by two laser beams with opposite circular polarization and a nematic liquid crystal was brought in contact with them. The anchoring conditions for the nematic were modulated in a similar way and an induced, field controlled replica manifested…
Abstract A liquid crystalline epoxy resin was cured under non‐ and 10T‐magnetic fields, and polydomain and monodomain networks were obtained, respectively. The fracture toughness of these systems was evaluated and it was clarified that the toughness of the magnetic field system showed a higher value. To investigate th…
A study of the optical properties of pure-and some metal ions doped ammonium sulfate crystals (AS) were made. Optical constants of AS crystals were calculated at room temperature. The optical absorption coefficient (α ) was analyzed and interpreted to be in the allowed direct transition. The introduction of Rb+ or Cs+…
ADVERTISEMENT RETURN TO ISSUEPREVNoteEffect of Particle Size, Composition, and Thermal Treatment on the Crystalline Structure of Polycaprolactone NanoparticlesEun Chul Cho, Kilwon Cho, Jong Kun Ahn, Junoh Kim, and Ih-Seop ChangView Author Information Skin Research Institute, Amorepacific Corporation/ R&D Center, 314-1…
Sb2S3 amorphous thin films were prepared by thermal evaporation of corresponding powder on thoroughly cleaned glass substrates held at temperature in the range 300-473 K. X-ray diffraction and atomic force microscopy have been used to order to identify the structure and morphology of surface thin films. The optical co…
Two mesoporous ordered carbon materials (MOCs) have been synthesized from silica templates by using sucrose as the carbon precursor. The textural characterization using Ar, N2, and CO2 adsorption combined with neutron diffraction showed that the two samples exhibit a significant microporous volume close to 0.5 cm3/g a…
Temperature has great impact on the structure and size of the linked crystallites of the conducting topmost layer formed at the surface of a polycarbonate film via the reaction BEDT-TTF+IBr [BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene]. We show that fine temperature control permits formation of a semiconducting top…
The degree of adhesion of protein crystals, heterogeneously nucleated and grown on different supports (e.g. glass plates and plates coated with poly-L-lysine, hexamethyl-disilazane and silicon) is measured directly with a purposely-developed technique. The sticking force crystal/support is determined by means of a fle…
The fundamental processes of crystal nucleation and growth are strongly dependent on the solvents used in the crystallization process. Consequently, the product quality is also affected by the choice of solvent used in the process. In this study, several solvents were used, and their impact on the polymorphic generati…
We study the orbitally dependent magnetic exchange in cyanide-based clusters as a source of the barrier for reversal magnetization. We consider the Mn(III)-CN-Mn(II) dimer and linear Mn(II)-NC-Mn(III)-CN-Mn(II) trimer containing octahedrally coordinated Mn(III) and Mn(II) ions with special emphasis on the magnetic man…
We measure the conductance of close-packed films of $\mathrm{CdTe}$ nanocrystals in field-effect structures in the dark and in the presence of light. We find that the majority carriers are holes, that they are injected from gold electrodes into the $\mathrm{CdTe}$ nanocrystal films, and that the hole density can be mo…
The Li + ion conductor Li 0.3 La 0.567 TiO 3 was synthesized as a metastable phase quenched in liquid N 2 from 1300 °C, and it was studied by time-of-flight powder neutron diffraction at high-resolution (HRPD instrument, ISIS Facility, U.K.). At room temperature a tetragonal perovskite superstructure was found, with a…
The reaction of Ru2Cl(O2CMe)(DPhF)3 (DPhF = N,N'-diphenylformamidinate) with mono- and polycarboxylic acids gives a clean substitution of the acetate ligand, leading to the formation of complexes Ru2Cl(O2CC6H5)(DPhF)3 (1), Ru2Cl(O2CC6H4-p-CN)(DPhF)3 (2), [Ru2Cl(DPhF)3(H2O)]2(O2C)2 (3), [Ru2Cl(DPhF)3]2[C6H4-p-(CO2)2] (…
The electronic structures and optical properties of titanate nanotubes have been studied. It was shown that ${\mathrm{H}}_{2}{\mathrm{Ti}}_{3}{\mathrm{O}}_{7}$ is a large gap insulator with an energy gap of $3.3\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, and Fe intercalation into the interlayer region of the layered ${\m…
Two hydroxy double salts (HDSs), zinc copper hydroxy acetate (ZCA) and zinc nickel hydroxy acetate (ZNA), and an analogous layered compound, zinc hydroxy acetate (ZHA), have been prepared by a coprecipitation method. The thermal degradation of these materials was characterized via thermogravimetric analysis (TGA), dif…
Near-infrared electroluminescence was recorded from unipolar single-wall carbon nanotube field-effect transistors at high drain-source voltages. High resolution spectra reveal resonant light emission originating from the radiative relaxation of excitons rather than heat dissipation. The electroluminescence is induced…
Two diarylethene derivatives 1 a and 2 a containing a 2,5-diaryl-3-thienyl group have been designed and synthesized. The pK(a) values of these compounds change upon photoirradiation. They have a phenol group as a proton source and a pyridinium group as an acceptor unit at each end of the pi-conjugated chain. The cycli…
Crystallizer design is often hindered by the lack of scaleup rules, hydrodynamic information, and predictive crystallization modeling tools. A hybrid CFD compartmentalization batch cooling crystallizer model is proposed to take into account localized mixing, heat transfer, and fluid hydrodynamics, combined with key pr…
The derivative-based analysis for detecting regions of the validity of the Vogel-Fulcher-Tammann (VFT) dependence for superpressed and supercooled liquids is discussed. For the temperature $(T)$ path the analysis introduced by Stickel et al. [J. Chem. Phys. 104, 2043 (1996); J. Chem. Phys. 107, 1086 (1997)] is recalle…