Materials Literature
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A combination of in situ measuring methods and computer simulation is suggested for the optimization of debinding and sintering processes in lab furnaces. From the optical measurement of sintering shrinkage and the mass loss measurement during debinding the respective reaction rates are derived. A high resolution of 1…
Using the quartz crystal microbalance, we studied the formation of polymer brushes and the penetration of these brushes by chemically identical free chains. The systems studied were composed of thiol-end-functionalized polystyrene chains, toluene, and gold. Brushes were exposed to dilute solutions of free chains of mo…
Magnetic nanocrystalline Gd2O3 particles have been successfully synthesized in a silica glass matrix by the sol–gel method at calcination temperatures of 700 °C and above. The optical spectra, corresponding to the transition from ground 8S7/2 to the excited 6P, 6I and 6D multiplets, show a large blue shift which incre…
To address the limited availability of radiation shielding data for brachytherapy as well as some disparity in existing data, Monte Carlo simulation was used to generate radiation transmission data for 60Co, 137CS, 198Au, 192Ir 169Yb, 170Tm, 131Cs, 125I, and 103pd photons through concrete, stainless steel, lead, as we…
In this report, a novel chemical synthesis of polyaniline/gold nanocomposite is explored using ionic liquid (IL) 1-Butyl-3-methylimidazolium hexafluorophosphate. The direct chemical synthesis of polyaniline/gold nanocomposite was initiated via the spontaneous oxidation of aniline by AuCl(4) (-) in IL. A nearly uniform…
A possible mechanism of electronic phase separation in the systems with orbital ordering is analyzed. We suggest a simple model taking into account an interplay between the delocalization of charge carriers introduced by doping and the cooperative ordering of orbitals favoring the electron localization at lattice dist…
Viscosities of dilute solutions were measured for four generations of peripherically c harged d endronized p oly(methyl methacrylate)s (CDPs) of two different chain lengths in water (no salt added) and of their uncharged analogues (UCPs) in chloroform. In all cases it was possible to describe ln(η solution /η solvent…
Plasmonic excitations in two- and three-dimensional ordered assemblies of metal-dielectric-metal nanosandwiches are studied by means of full-electrodynamic calculations using the layer-multiple-scattering method. Plasmon hybridization results in collective electric-dipole-like and magnetic-dipole-like resonant modes,…
A series of new electron acceptor bearing silicon phthalocyanine (SiPc) triads have been synthesized, using the six-coordinated nature of the central silicon atom, by attachment of two electron-acceptor units, fullerene SiPc−(C 60 ) 2, trinitrofluorenone SiPc−(TNF) 2, and trinitrodicyanomethylenefluorene SiPc−(TNDCF)…
We report on the role of Al 2 O 3 and K 2 O on crystallization in glasses featuring a SiO 2 /Li 2 O ratio (3.13 to 4.88) far beyond that of lithium disilicate (LD, Li 2 Si 2 O 5 ) stoichiometry. Glasses in both bulk and frit form were produced by the conventional melt‐quenching technique. Scanning electron microscopy…
Foreword. Preface. List of Contributors. Part One: Thermodynamics. 1. Phase Formation in Multicomponent Monotectic Al-based Alloys (Joachim GrAbner, Djordje MirkoviA , and Rainer Schmid-Fetzer). 1.1 Introduction. 1.2 Experimental Methods. 1.3 Systematic Classification of Ternary Monotectic Phase Diagrams. 1.4 Selected…
Using $^{23}\text{N}\text{a}$ NMR measurements on sodium cobaltates at intermediate dopings $(0.44\ensuremath{\le}x\ensuremath{\le}0.62)$, we establish the qualitative change in behavior of the local magnetic susceptibility at ${x}^{\ensuremath{\ast}}=0.63--0.65$, from a low-$x$ Pauli-like regime to the high-$x$ Curie…
High-resolution magnetoresistance data in highly oriented pyrolytic graphite thin samples manifest nonhomogenous superconductivity with critical temperature ${T}_{c}\ensuremath{\sim}25\text{ }\text{K}$ and higher temperature. Our claim is based mainly in the observation of anomalous hysteresis loops of resistance vers…
The effects of the incorporation of multiwalled carbon nanotubes (MWNT) with a diameter range of 10−30 nm on the shear-induced crystallization behavior of poly(butylene terephthalate) (PBT) were investigated under myriad shearing and loading conditions employing principally the small-amplitude oscillatory shear flow.…
Supramolecular principles have been applied for improving the spin crossover activity of metal centers due to cooperative effects in solution. Thus, incorporation of alkyloxy tails at the phenyl group of Fe(sal2trien) 2a provides amphiphilic complexes Fe(sal-OR2trien) 2b-d (b, R = C6H13; c, R = C8H17; d, R = C18H37) c…
We model the self-assembly of superlattices of colloidal semiconducting nanorods horizontally and vertically oriented on material substrates. The models include van der Waals and Coulombic coupling between nanorods with intrinsic electric dipoles and their coupling to the substrates. We also investigate the effect of…
Core-shell structural MWNT/ZrO2 nanocomposites were successfully prepared by one-step hydrolyzing of MWNT-dispersed ZrOCl2.8H2O aqueous solution. A highly conformal and uniform monoclinic zirconia coating was deposited on MWNTs by this new and simple method, and the thickness of the coating increased with the reaction…
Abstract BACKGROUND: This paper describes the reuse of paper sludge, an industrial solid waste, for the preparation of sodium carboxymethyl cellulose (CMC). The process includes pretreatment, basification and etherification. RESULTS: The optimal pretreatment condition involved the addition of 6.7% hydrochloric acid to…
MgB2 monofilamentary nickel-sheated tapes and wires were fabricated by means of the ex-situ powder-in-tube method using either high-energy ball milled and low temperature synthesized powders. All sample were sintered at 920 C in Ar flow. The milling time and the revolution speed were tuned in order to maximize the cri…
Nanomechanical shuttles transferring small groups of electrons or even individual electrons from one electrode to another offer a novel approach to the problem of controlled charge transport. Here, we report the fabrication of shuttle-junctions consisting of a 20 nm diameter gold nanoparticle embedded within the gap b…