Materials Literature
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Abstract Wood‐based composites such as particleboard and medium‐density fiberboard are currently made with formaldehyde‐containing adhesives. Since the government is continuously developing and implementing very stringent regulations to eliminate formaldehyde emissions into the environment, alternative approaches must…
We have prepared an unique cluster, [Eu(H 2 O) 3 (α 2 -P 2 W 17 O 61 )(Eu 2 (H 2 O) 7 )] 4 4– , 1 , in high yield and the preparation and crystallization is highly reproducible. This compound is based on the 1:1 [Eu (α 2 -P 2 W 17 O 61 )] 2 14– cluster where Eu2 is bound in the defect of the cap region of the α 2 -P 2…
The electronic properties of a series of colossal magnetoresistance (CMR) compounds, namely LaMnO3, La(1-x)Ba(x)(MnO3 (0.2 < or = x < or = 0.55), La(0.76)Ba(0.24)Mn(0.84)Co(0.16)O3, and La(0.76)Ba(0.24)Mn(0.78)Ni(0.22)O3, have been investigated in a detailed spectroscopic study. A combination of X-ray photoelectron sp…
We show that an ethylenic coupler provides a very strong intramolecular magnetic interaction. A recently synthesized nitronyl nitroxide derivative, D-NIT2, is investigated by ab initio quantum chemical methods. The broken symmetry approach yields a coupling constant -541 K that is in good agreement with the observed v…
Thin polystyrene (PS) films embedded with multiwalled carbon nanotubes (MWNTs) grafted with PS chains were prepared via solution casting, and the nanomechanical behavior of the thin films was probed by using AFM, TEM, and SEM. Percolated network of entangled nanotubes was observed to be well-dispersed in the PS thin f…
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…