Materials Literature
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We investigate the crazing process (craze initiation, growth, and failure) in symmetric polystyrene- b -poly(2-vinylpyridine) (PS- b -P2VP) glassy thin films. PS- b -P2VP is a model material for this study due to its ability to self-assemble into well-aligned lamellar microdomains and the similar mechanical properties…
We have presented liquid crystal phase gratings using photoregulated photocrosslinkable polymer liquid crystals. The phase grating consists of homogeneous and 90°-twisted nematic area and shows unique polarization conversion in the diffraction process. The diffraction properties are well explained by the theory based…
The structures and magnetic properties of melt-spun B-rich (10 at. %) and Nb-containing nanocomposite alloys, with compositions based on the formula (Nd0.75Pr0.25)yFe90−y−xNbxB10 (y=8, 10; x=0, 2, 4) have been studied. Considerable enhancement of the intrinsic coercivity, (of 657kA∕m) together with excellent energy de…
By using a two-dimensional (2D) real-space self-consistent field theory, we present the phase diagrams of monodisperse ABC triblock copolymers in a three-component triangle style with the interaction energies given between the distinct blocks; this system displays richer phase behavior when compared with the correspon…
The reaction of [M(CN)(6)](3-) (M = Cr(3+), Mn(3+), Fe(3+), Co(3+)) and [M(CN)(8)](4-/3-) (M = Mo(4+/5+), W(4+/5+)) with the trinuclear copper(II) complex of 1,3,5-triazine-2,4,6-triyltris[3-(1,3,5,8,12-pentaazacyclotetradecane)] ([Cu(3)(L)](6+)) leads to partially encapsulated cyanometalates. With hexacyanometalate(I…
Mesoporous silica nanofibers containing CdS quantum dots (QDs) were fabricated by the confined self-assembly of a lyotropic mesophase within the nanochannels of porous alumina. The resulting mesoporous nanofibers show unique internal mesostructures that depend on the size of the incorporated CdS QDs. Porous nanochanne…
Magnetism in organic and non-traditional inorganic materials (NTIMs) is a fascinating phenomenon from both scientific and technological perspective. Recent experimental discovery of ferromagnetism in organic C 60 -based polymers has challenged the traditional concepts of the origin of magnetism. Although the nature of…
Abstract In‐situ high‐pressure X‐ray diffraction studies were performed on EuWO 4 to 12 GPa. We found that EuWO 4 transforms from the tetragonal I4 1 / a structure to the monoclinic I2/ a structure at 8.5(5) GPa, being this phase transition re‐ versible. No other structural change is detected up to 12 GPa. The EOS of…
The porphyrin-sexithiophene-fullerene triad 2, where the two central thiophene units of the sexithiophene spacer are bridged with a crown-ether-like polyether chain, undergoes efficient intramolecular electron transfer from the photoexcited porphyrin moiety to the fullerene through the sexithiophene. However, complexa…
A new polybenzoxazole containing an adjacent hydroxyphenyl group was synthesized by using Suzuki coupling reaction accompanied by a simultaneous elimination reaction of acetyl protecting group of hydroxyl group. The polymer in solution as well as in the film exhibited a strong emission (520 nm) with a large Stokes shi…
Abstract Structural, dielectric and optical properties of the crystal C 3 N 2 H 5 ClO 4 have been studied by X‐ray diffraction, dielec‐tric and birefringence measurements. On cooling, structural phase transitions occurring at 373 K ( T c1 ) and 210 K ( T c2 ) are of second and first order, respectively. It is consider…
The complete elastic properties of tetrahedrally coordinated amorphous carbon (ta-C) thin films have been measured in the temperature range of 300–873K. Flexural and torsional mechanical oscillators were fabricated from ta-C, and using the resonant frequency of the oscillators as a function of temperature, we calculat…
Using a powerful multilevel simulation approach, we "visualize" the complete growth dynamics of hydrogenated silicon nanostructures under realistic experimental conditions of a plasma reactor. For the early stages of the synthesis, we demonstrate for the first time how precise control of atomic hydrogen not only permi…
Luminescent silica nanotubes SNT-2 (loaded with coumarion laser dye 2) and SNT-3 (loaded with anthracene laser dye 3) were prepared by sol-gel cocondensation of functional dyes and TEOS in a cholesterol-based organogel system. The emission colors of silica nanotubes were tuned by using different functional dyes. Inter…
The amorphous carbon thin films have been deposited on silicon and quartz substrates by microwave surface wave plasma chemical vapor deposition at low temperature (<100°C) in Ar∕CH4 phase gas. Doping of iodine has been done in the postdeposited films by exposing them in iodine vapor. The photovoltaic measuremen…
Sn19.3Cu4.7As22I8, a new clathrate-I compound with a cationic host framework containing transition metals, has been synthesized, and its crystal structure has been determined. It crystallizes in the cubic space group Pmn with a unit cell parameter a = 11.1736(3) angstroms and Z = 1 (R = 0.031 for 329 independent refle…
Photochromic diarylethene dimer derivatives with large two-photon absorption (TPA) cross-sections have been designed and synthesized. The derivatives have a D-pi-D structure in which indole rings are used as donor units (D) and 1,4-bis(ethynyl)benzene or 1,4-bis(ethenyl)benzene as a pi-conjugated chain unit (pi). Comp…
Fluorescence spectroscopy is employed to follow the ion exchange of an emissive dye--a carboxylated perylene imide--on a layered double hydroxide. The exchange of the carboxylate ions starts at the edges of the layered double hydroxide crystals and is followed by diffusion to the basal plane. Such space-resolved obser…
As the role for diagnostic and therapeutic contrast-enhanced imaging increases, review of the epidemiology, mechanisms, risk factors, and pretreatment for radiocontrast-mediated anaphylactoid reactions becomes more and more pertinent. Ongoing research has failed to elucidate the precise mechanisms of both early and la…
Mechanically responsive surfaces that allow to switch reversibly from a hydrophobic to a hydrophilic substrate are reported. The surfaces are constituted of polyelectrolyte multilayers deposited on modified charged silicone sheets. n bilayers of poly(allylamine)-Nafion (PAH-Naf) and m bilayers of poly(allylamine)-poly…