Materials Literature
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In mixtures of thermotropic liquid crystals with spherical poly (methyl methacrylate) particles, self-supporting networklike structures are formed during slow cooling past the isotropic-to-nematic phase transformation. To characterize the process of network formation in terms of morphology, phase transformation kineti…
The deformation and fracture behavior of soda-lime and borosilicate glass rods was examined during classic and symmetric Taylor impact experiments for impact pressures to 4 and 10GPa, respectively. High-speed photography and piezoresistive gauges were used to measure the failure front velocities in both glasses, and f…
We demonstrate that electron wave functions change their dimensionality at some commensurate directions of a magnetic field in conductors with open [quasi-one-dimensional (Q1D)] sheets of Fermi surface. These $1\mathrm{D}\ensuremath{\rightarrow}2\mathrm{D}$ dimensional crossovers lead to delocalization of wave functio…
The equilibrium structure and strain energy per atom of $(n,n)$ and $(n,0)$ single-walled carbon nanotubes (SWNTs) are analyzed by developing a simple force-field based atomistic model, in which the pyramidalization angle is used to characterize the inversion term energy associated with the curvature at an atom. Their…
Abstract Summary: The Ti III Cp 2 Cl‐catalyzed radical ring opening of epoxides produces Ti alkoxides which initiate the ring‐opening polymerization of ε ‐caprolactone. A linear dependence of $\overline M _{\rm n}$ on conversion, linear kinetics, low $\overline M _{\rm w} /\overline M _{\rm n}$ values, and the synthes…
All isohedral simple tilings of 3D Euclidian space by tiles with </=16 faces have been determined. There are no such tilings by polyhedra with less than 14 faces. For simple polyhedra with 14, 15 and 16 faces, there are respectively 10, 65 and 434 that fill space and a total of 23, 136 and 710 distinct tilings. The ti…
Abstract Summary: The grafting of poly(ethylene oxide) (PEO) onto silica nanoparticles was performed in situ by the ring‐opening polymerization of the oxirane monomer initiated from the mineral surface using aluminium isopropoxide as an initiator/heterogeneous catalyst. Alcohol groups were first introduced onto silica…
The media used for dispersion have a significant effect on the photoluminescent (PL) efficiency of colloidal CdSe nanocrystals, in addition to synthetic parameters. The investigated dispersion media were water-insoluble hexanes (Hex), toluene (Tol), chloroform (CHCl 3 ), and water-miscible tetrahydrofuran (THF); in ad…
On the basis of the coordination geometry of metal ions, regular cubic, clubbed, and wirelike nanocrystals of Cd(2+)-/PtCl(6)(2-)-mediated, and Hg(2+)-/Ag(+)-/PtCl(4)(2-)-mediated multiporphyrin arrays have been grown at the water-chloroform interface. The nanocrystal growth process was monitored by the transmission e…
Benzene, diethylbenzene, and ethylenediamine-bridged bistrialkoxy precursors were used in the synthesis of multifunctional PMO copolymers for the adsorption of phenols and metal ions. Polyoxyethylene(10) stearyl ether (Brij 76) was used as the structure director with the surfactant template approach in the synthesis.…
The aging dynamics in thin films of poly(methyl methacrylate) (PMMA) have been investigated through dielectric measurements for different types of aging processes. The dielectric constant was found to decrease with increasing aging time at an aging temperature in many cases. An increase in the dielectric constant was…
We demonstrate films of the well-known ferroelectric lead zirconate titanate (PZT) prepared directly on copper foils by chemical solution deposition (CSD). The films exhibit saturating polarization hysteresis, remanent polarization values of 26μC∕cm2, and permittivities of 800; these properties are comparable to those…
Photocatalytic reduction of mercury in aqueous solutions using PW12O40(3-) or SiW12O40(4-) as photocatalysts has been studied as a function of irradiation time, concentration of Hg(II), polyoxometalate, and organic substrate in the presence or absence of dioxygen. The photocatalytic cycle starts with irradiation of po…
V for victory? Theory has suggested that V-shaped molecules may provide a route to biaxial nematic liquid crystals (see picture). The identification of a biaxial nematic phase is, however, a challenging task. Even if it is yet to be agreed that the hunt is over, it appears that this path is well worth pursuing.
Tables of crystallographic properties of the magnetic subperiodic groups, i.e. the 31 magnetic frieze-group types, the 394 magnetic rod-group types and the 528 magnetic layer-group types are presented. The content and format is similar to that of non-magnetic subperiodic groups and space groups given in International…
Biomimetische Lichtsammelantennen mit ausgezeichneter Löslichkeit und Langzeitstabilität sind durch nichtkovalente Polymerisation semisynthetischer Zinkchlorine zugänglich. Die reversible Bildung der Zinkchlorin-Aggregate wurde spektroskopisch untersucht (siehe Bild), ihre stabförmige Struktur wurde experimentell durc…
A perfluorinated monomer, perfluoro-2-methylene-4-methyl-1,3-dioxolane (PFMMD), was synthesized by various methods. The monomer was polymerized in bulk and/or in the solution by a free radical mechanism using perfluorodibenzoyl peroxide and/or perfluorodi- tert -butyl peroxide as an initiators. The polymers obtained (…
Ein Ligand, fünf im NIR emittierende Komplexe: Tropolonat(trp)-Liganden bilden mit mehreren Lanthanoid(LnIII)-Ionen [Ln(trp)4]−-Komplexe (Ln=Nd, Ho, Er, Tm und Yb), die im nahen IR-Bereich emittieren (siehe Spektren). Die Strukturen dieser Komplexe im Festkörper wurden ebenso charakterisiert wie ihre photophysikalisch…
The mesoporous silica superstructure SBA-1 was studied to obtain a formulation in terms of curvature that is important for surfactant structures and the mechanism of formation of inorganic replicas. The picture shows an oblique view of the atomistic model used to calculate the X-ray diffraction patterns. Green regions…
A brief summary of quantitative structure−property relationship methodology, together with an explanation of the approach using theoretical molecular descriptors to study diverse physical, chemical, and technological properties of organic compounds, is given. Studies of several properties of importance to fuels scienc…