Materials Literature
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Two kinds of 180\ifmmode^\circ\else\textdegree\fi{} domain wall structures in the tetragonal phase of ferroelectric perovskites, one of the ``Ising type'' with only one polarization component and the other of the ``Bloch type'' with two polarization components within the wall layer, have been derived from the Landau-G…
Abstract The poly-(ethylene-b-propylene) was nucleated for a study of the structure modifications as well as the improvement of the mechanical properties, particularly the impact resistance. The nucleation was accomplished by two various red pigments: a linear trans-quinacridone dye (as ß-phase nucleator) and a dimeth…
The formation of highly coherent nanocrystalline semiconductor films on polycrystalline metal substrates has important practical and theoretical implications. Electron diffraction patterns reveal that quantum dots (QDs) of CdSe grown on a gold film on a mica substrate are coherent over several micrometers in the later…
Lithium formate monohydrate (FLMH) has been studied by Raman spectroscopy and infrared transmittance. The Raman spectra have been measured in the temperature range 10 to 490 K. The low temperature Raman spectra showed a temperature dependence of the intensities of the modes observed in the Z(XX)Y polarisation with a m…
The crystallization and unusual crystalline morphologies of compatible mixtures of tetrahydrofuran−methyl methacrylate diblock copolymer with tetrahydrofuran homopolymer were studied. It is shown that the PTHF [poly(tetrahydrofuran)] block of the copolymer cocrystalizes with the PTHF homopolymer in the PTHF microphase…
For network-forming components, we develop a model of the phonon-assisted structural transition between the configurations of atoms, which allows for quantitative predictions of the liquid-glass transition. This model is based on our investigation that shows that vitreous ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ consists…
All articles of this category A pyriphorphyrinone was synthesized by cyclocondensation of tripyrrane 2 with 2,6-diformyl-3-hydroxypyridine (1b) . It was possible to identify 3b as the exclusively formed tautomer. porphyrins - cyclocondensation - tautomers
Glassy carbon has desirable properties for electron field emission such as surface inertness, electrical conductivity, and thermal stability. In addition, a uniform thick substrate with a polished surface is easily obtainable. This enables one to apply large scale integrated circuit processing for fabricating arrayed…
Clay mineralogical characteristics of volcanic ash soils in Changbaishan and Sanjiaolongwan, Jilin Province and Wudalianchi, Heilongjiang Province, Northeast China, were investigated. The clay mineral fractions of 8 Changbai-shan pedons, 1 Sanjiaolongwan pedon, and 4 Wudalianchi pedons were characterized by the predom…
This paper reviews work carried out by the authors in developing nanoporous sol-gel films as hosts for semiconductor crystallites, for applications in nonlinear integrated optics, including aspects of fabrication, characterisation and modelling. Particular attention is given to three novel techniques — optospinography…
Monte Carlo simulation is used to study the adsorption of diblock copolymers and homopolymers on bare surfaces and surfaces modified by end-grafted polymers at densities well below the brush limit. Monomer distribution profiles for the adsorbed polymer are used to compute the surface excess (Γ exc ). The competitive a…
The shear-induced reorientation of the hexagonal surfactant mesophase is investigated by deuterium nuclear magnetic resonance spectroscopy. The NMR spectra of the sheared samples, measured in situ with two different shear geometries, either cone and plate or coaxial cylinders, prove that the hexagonal axis (the direct…
Details are reported for the synthesis and characterization of composite materials prepared from powdered Bi 3 Ru 3 O 11 and a polymeric adhesive fashioned into disk electrodes. The structure of the synthesized material was found to be that of the cubic KSbO 3 type on the basis of single-crystal and powder X-ray diffr…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTImproved Methods for the Synthesis of Porphyrin Alcohols and Aldehydes from Protoporphyrin IX Dimethyl Ester and Their Further ModificationStephen B. Kahl, John J. Schaeck, and Myoung-Seo KooView Author Information Department of Pharmaceutical Chemistry, University of Californi…
Abstract The influence of yarn geometry on surface topography, friction, and smoothness of fabrics is reported. A systematic increase in fabric construction (threads per cm) increases frictional resistance but the fabric surface becomes smoother. This is attributed to the diminishing crown height as yarn sett increase…
The crystal structure of cobalt(II) acetate tetrahydrate, Co(C 2 H 3 O 2 )·4H 2 O, has been refined using single-crystal, laboratory powder, and synchrotron powder diffraction data, both individually and in various combinations. The compound crystallizes in the monoclinic space group P 2 1 / c , with a =4.80688(3), b…
A nonlinear optical material, o–chlorobenzol–benzoyl thiourea (C 14 H 11 ClN 2 OS), has been characterized by X-ray powder diffraction. Experimental values of 2θ corrected for systematic errors, relative peak intensities, values of d , and the Miller indices of 78 observed reflection with 2θ up to 72° are reported. Th…
Abstract Diethyl triacontanedioate (CH 3 CH 2 O 2 C(CH 2 ) 28 CO 2 CH 2 CH 3 ) and triacontane‐ 1,30‐diol (HO(CH 2 ) 30 OH) were prepared and condensed to synthesize poly(triacontamethylene triacontanedioate) (PTRM). The properties of (PTRM) were compared with those of commercial low density polyethylene (LDPE), and e…
The influence of the chemical composition of polymers on their modification in argon or oxygen RF plasmas has been studied. Hexatria-contane (C36), octadecyloctadecanoate (OOD), and octadecyloctadecanamide (OAD) have been chosen as model compounds of the following polymers: high density polyethylene (HDPE), polycaprol…
Adsorption of polymers on mineral surfaces allowing colloidal stability have widespread applications in industrial processes. The binding mechanism has been quite well described on oxide surfaces. Mainly in terms of hydrogen bonds and electrostatic interactions between charged sites and polymer segments. This phenomen…