Materials Literature
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Suspensions of binary mixtures of hard-sphere poly-methylmethacrylate colloidal particles were studied at six different size ratios alpha. The main aim was to determine the range of size ratios over which the binary colloidal crystals AB2 and AB13 are stable. Combining these results with those of earlier work, we foun…
Bulk modification of polypyrrole (PPY) with poly(vinyl alcohol) (PVA) was carried out by the electropolymerization of pyrrole in the presence of PVA in the reaction solution, with tetraethylammonium perchlorate (TEAP) as the electrolyte. The surface morphology of the as-synthesized PPY-TEAP-PVA film was investigated u…
Herein is reported a metamorphosis taking place in a gold nanosized system. The observed phenomenon of shape and size transformations was found to be completely reversible. Unlike most procedures in the literature where shape and size control occur in the synthetic step by adding growth- and shape-controlling agents s…
Iron aggregates are arranged into a close-packed structure through coordination bonds to give a material that displays a structural and magnetic hierarchy. The tripodal proligand nitrilotripropionic acid (H3ntp=N(CH2CH2COOH)3) successfully traps {Fe13} aggregates, thus producing a lattice that displays three levels of…
Experimental studies of the magnetic domain structure of amorphous wires with positive (Fe-rich) and negative (Co-rich) magnetostriction by using the magneto-optical indicator film method have been performed. The following main results have been obtained. (i) Fe-rich wires possess unclosed 180° surface domain structur…
Abstract Polyurethane/organically modified montmorillonite (PU/O‐MMT) nanocomposites were electrospun and the effect of O‐MMT on the morphology and physical properties of the PU/O‐MMT nanofiber mats were investigated for the first time. The average diameters of the PU/O‐MMT nanofibers were ranged from 150 to 410 nm. T…
Besides its importance for conventional ceramics, mullite has become a choice of material for advanced structural and functional ceramics due to its favourable properties. Some outstanding properties of mullite are low thermal expansion, low thermal conductivity, excellent creep resistance, high-temperature strength,…
Boron nitride nanotubes (BNNT) of significant lengths were synthesized by reaction of boron with nitrogen. Barium calcium aluminosilicate glass composites reinforced with∼4 wt% of BNNT were fabricated by hot pressing. Ambient‐temperature flexure strength and fracture toughness of the glass‐BNNT composites were determi…
Abstract Sol‐gel technology was first discovered in the late 1800s, but it was not until the early 1970s that renewed interest in the technique was generated, when monolithic inorganic gels were formed at low temperature. In this review, we introduce the sol‐gel reaction and the properties of the gel matrix in the fir…
Here, we report an efficient way to produce homogeneous Pt nanoparticles within a well-defined size range (3.5-6.6 nm) as a result of the seeded growth procedure using Pluronic L64 polymer capping agent. First, small seeds (3.5 nm) were prepared by the reduction of H2PtCl6.6H2O in water with NaBH4 in the presence of t…
The densification of non‐oxide ceramics like titanium boride (TiB 2 ) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐tempe…
We report here on applying electric fields and dielectric media to achieve controlled alignment of single-crystal nickel silicide nanowires between two electrodes. Depending on the concentration of nanowire suspension and the distribution of electrical field, various configurations of nanowire interconnects, such as s…
The dynamics of inertial cavitation bubbles produced by short pulses of high-intensity focused ultrasound near a rigid boundary are studied to get a better understanding of the role of jet formation and shock wave emission during bubble collapse in the therapeutic applications of ultrasound. The bubble dynamics are in…
Site-selective deposition of UV- and visible-light-emitting ZnO crystals was successfully achieved in an aqueous solution at low temperature. Molecular recognition was effectively utilized for patterning of ZnO crystals on self-assembled monolayers. Crystalline ZnO was further controlled to have different morphologies…
This work reports the fabrication and the characterization of a new composite consisting of multiwalled carbon nanotubes (CNTs) and conducting titanium nitride (TiN) with a higher specific surface area ( S BET ), enhanced electrical conductivity (σ), and specific capacitance. With increasing CNT content, the electrica…
An unusual growth phenomenon, with no precedent in vapor-phase thin film growth, is described here, for the case of the growth of stacked multiple layers of vertically aligned carbon nanotubes(1-6) on solid substrates. As multiple layers of ordered nanotubes are sequentially deposited from the vapor onto the substrate…
Qualität und Ausbeute hoch: Die vorgestellte Synthese liefert CdSe- und CdTe-Halbleiter-Nanokristalle, ohne dass ein Einspritzen der Vorstufen nötig ist. Sie ermöglicht zudem eine genaue Einstellung von Größe und Form der Nanokristalle, wie aus den synthetisierten tetraedrischen CdSe-Nanokristallen ersichtlich ist (TE…
The effect of fractal clusters on magnetic and transport properties of percolative superconductors is considered. The superconductor contains percolative superconducting cluster, carrying a transport current, as well as clusters of a normal phase, which act as pinning centers. A prototype of such a structure is a high…
The optical properties of two-dimensional electron gases in ZnSe/(Zn,Be)Se and ZnSe/(Zn,Be,Mg)Se modulation-doped quantum wells with electron densities up to 1.4x10^{12} cm^{-2} were studied by photoluminescence, photoluminescence excitation and reflectivity in a temperature range between 1.6 and 70 K and in external…
Growth of interfaces during vapor deposition is analyzed on a discrete lattice. It leads to finding distribution of local heights, measurable for any lattice model. Invariance in the change of this distribution in time is used to determine the finite size effects in various models The analysis is applied to the discre…