Materials Literature
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Summary This paper describes the conditions for dispersion and flocculation of clays, and the impact of this process on soils of contrasting textures cropped with rice. Clay seems to be translocated down the profiles and along a topographic sequence. The clays are mixed kaolinite–smectite. The cation exchange capacity…
A breakthrough step in the development of magnetic refrigeration would be to find a way to increase the cooling capacity of the magnetic refrigerant material in order to make this technology even more energy efficient. In this paper, we present a theoretical study which shows how to increase the refrigerant capacity u…
The effect of mechanical milling on the structure and luminescent properties of CdSe powder has been investigated by means of cathodoluminescence (CL) in the scanning electron microscope, transmission electron microscopy (TEM) and x-ray diffraction. The starting powders were ball milled for times between 5 and 20h. TE…
Surrounded by selenium: Pulse field gradient spin-echo (PGSE) NMR diffusion studies of a mixture of oligomeric 1,2-diselenolene PtIV complexes are performed to characterize the species in solution (see structure: n=0 (1), n=1 (2), n=2 (3); red Pt, green Se, blue N, gray C). The results are in accord with the single-cr…
Electrical contact to amorphous silicon nanoparticles was established with a method that self aligns the contacts to the particles. Charge transport characteristics were studied as a function of temperature and voltage. The conduction in these devices was not limited by the metal∕semiconductor barrier; rather it was l…
A systematic investigation of optical absorption and luminescence is presented for Er 3+ ions in the Bi 4 Si 3 O 12 crystal. The intrinsic emission of this crystal gives rise to a radiative energy transfer among the host lattice and Er 3+ ions. Measured oscillator strengths for seven different transitions from the gro…
Spectra and transients of the photoluminescence (PL) of undoped and Er-doped size-controlled nanocrystalline Si∕SiO2 multilayered structures with mean nanocrystal size of 1.5–4.5nm have been comparatively investigated. The Er-doped structures exhibit a strong Er-related PL band at 0.81eV, while the efficiency of the i…
Optical properties of normal spinel MxCo3−xO4(M=CrandCu) films grown by sol-gel method have been investigated by the spectroscopic ellipsometry (SE) in the 1.5–4eV region. For x<1.0, the cubic lattice constant of CrxCo3−xO4 is found to increase linearly with x while that of CuxCo3−xO4 decreases slightly. By com…
Abstract Summary: To obtain a balance between toughness (as measured by notched impact strength) and elastic stiffness of poly(butylene terephthalate) (PBT), a small amount of tetra‐functional epoxy monomer was incorporated into PBT/[ethylene/methyl acrylate/glycidyl methacrylate terpolymer (E‐MA‐GMA)] blends during t…
Abstract Full Paper: Using Sn( II )2‐ethylhexanoate (SnOct 2 ) in combination with 1,4‐butanediol, 1,1,1‐tris(hydroxymethyl)propane (THMP) or pentaerythritol as initiator systems telechelic polyesters or star‐shaped homopolyesters of ε ‐caprolactone ( ε ‐CL) or L,L ‐lactide (L‐LA) were prepared. These homopolymers wer…
Abstract Summary: Reinforced clear coats were prepared using nanosized silica and alumina particles in UV/EB curable acrylate formulations. For a firm embedding of the oxide nanofillers via covalent bonds to the network acrylates their surfaces were modified by polymerization‐active trialkoxysilanes, e.g., methacrylox…
Hydrosilylation by H-terminated silicon of the double bond of methyl 10-undecenoate with formation of a robust SiC bond is the first step in a three-step procedure (see scheme) for anchoring the single-molecule magnet (SMM) [Mn12O12(OAc)16(H2O)4] (1) on the Si(100) surface.
High energy (MeV)C2+,F2+, and Cl2+ ions were irradiated onto π-conjugated polyaniline emeraldine base (PAN-EB) samples. The energy of an ion beam was controlled to a range of 3–4.5MeV, with the ion dosage varying from 1×1012 to 1×1016ions∕cm2. The highest dc conductivity (σdc) at room temperature was measured to be ∼6…
The temperature dependence of the magnetocrystalline anisotropy and the effects of pressure on the intrinsic magnetic properties of the hexagonal DO19 phase of Fe3Ge single crystals have been studied. The easy-magnetization direction is in the basal plane at low temperatures and a spin reorientation transition from pl…
Abstract Summary: Polystyrene (PS) was toughened with ethylene‐propylene‐diene terpolymer (EPDM) in the presence of styrene‐butadiene‐styrene block copolymer (SBS). Incorporation of SBS into the PS/EPDM blends clearly improved the impact properties. For PS/EPDM/SBS (mass ratio: 69/21/10) blends, the notched Charpy imp…
Structural differences between pure and LiCF3SO3-doped amorphous WO3 thin films were studied by Raman spectroscopy and X-ray photoelectron spectroscopy analysis. Based on our interpretation of reports in the literature on Raman spectra of WO3 thin films, we found that the LiCF3SO3-doped amorphous WO3 film presented gr…
The deposition and characterization of thick M-type barium hexaferrite (BaFe12O19) films produced by a modified liquid phase epitaxy deposition technique are reported. The films are deposited on (111) oriented single crystal garnet (Gd3Ga5O12) substrates. The thickness of the films ranged between 45 and 80μm with grow…
Abstract We present the results of a first‐principles study of the electronic and structural properties of strontium chalcogenides, SrS, SrSe and SrTe. The computational method is based on the full‐potential linear muffin‐tin orbitals method (FP‐LMTO) augmented by a plane‐wave basis (PLW). The exchange and correlation…
BACKGROUND: Annotating genomes remains an hazardous task. Mistakes or gaps in such a complex process may occur when relevant knowledge is ignored, whether lost, forgotten or overlooked. This paper exemplifies an approach which could help to resuscitate such meaningful data. RESULTS: We show that a set of closely relat…
A microscopic model of the molecular magnet ${\mathrm{V}}_{15}$ is used to study mechanisms for the adiabatic change of the magnetization in time-dependent magnetic fields. The effects of the Dzyaloshinskii-Moriya interaction, the most plausible source for the energy-level repulsions that lead to adiabatic changes of…