Materials Literature
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There is increasing evidence that entropy can induce microphase separation in binary fluid mixtures interacting through hard particle potentials. One such phase consists of alternating two-dimensional liquidlike layers of rods and spheres. We study the transition from a uniform miscible state to this ordered state usi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTManganese Oxide Thin Films with Fast Ion-Exchange PropertiesOscar Giraldo, Stephanie L. Brock, William S. Willis, Manuel Marquez, Steven L. Suib, and Stanton ChingView Author Information Department of Chemistry, University of Connecticut, U-60 55 North Eagleville Rd.,…
Rietveld quantitative X-ray diffraction analysis of the fly ash Standard Reference Materials (SRMs) issued by the National Institute of Standards and Technologies was performed. A rutile ( TiO 2 ) internal standard was used to enable quantitation of the glass content, which ranged from 65% to 78% by weight. The GSAS R…
An effective way to design well-fitting products is to analyse human body forms and to classify them into several groups. In the present study, a new method is proposed to analyse human body forms using the FFD (Free Form Deformation) technique. The FFD method is a way to deform the shapes of object smoothly by moving…
We have found giant negative magnetoresistance in the one-dimensional conductor $\mathrm{TPP}[\mathrm{Fe}(\mathrm{Pc})(\mathrm{CN}{)}_{2}{]}_{2}$ below 50 K. The reduction of the resistance is larger in the field perpendicular to the one-dimensional axis than parallel to the axis. The magnetic susceptibility shows ani…
Synthetic polymers and co-polymers are described, to be used as carriers of reporter groups for gamma-, magnetic resonance (MR), and computed tomography (CT) imaging. Those compounds include polychelating and amphiphilic polymers and serve as key components of various contrast agents. Single terminus-activated polyche…
Attaching branched alkyl chains directly to the phenyl ring of substituent R in hexaalkynylbenzene (see picture) proved to be the key in the synthesis of the first room-temperature discotic nematic liquid crystals. A liquid crystal device having discotic nematic liquid crystals shows advantages over conventional devic…
The site preference and magnetic properties of Zn-Zr substituted BaM ferrite ${\mathrm{BaFe}}_{12\ensuremath{-}x}{\mathrm{Zn}}_{x/2}{\mathrm{Zr}}_{x/2}{\mathrm{O}}_{19}$ nanoparticles with $x=0--1.6$ have been studied using M\"ossbauer spectra and magnetic measurement. The results show that the magnetizations and magn…
We report observations of acoustoelectric effects in carbon nanotubes. We excite sound in &mgr;m long ropes of single walled carbon nanotubes suspended between two metallic contacts by applying radio-frequency electric field. The sound is detected by measuring either the dc resistance of the tubes in a region of stron…
Microsatellite markers were developed to examine the genetic diversity of field populations of the centric diatom Ditylum brightwellii . Polymerase chain reaction amplification of two dinucleotide microsatellite loci using DNA extracted from single cell isolates was sensitive enough to identify genetically distinct cl…
Hybrid materials have found widespread applications in recent years and are one example for the bottom-up approach to nanotechnology: materials and phases are generated by physical or chemical means from precursor compounds forming nanoscale or nanocomposite materials. This review describes basic principles and severa…
Dense CaBi 4 Ti 4 O 15 (CBT) ceramics with a unique texture were prepared by the reactive templated grain growth (RTGG) method using an extrusion technique. Plate-like Bi 4 Ti 3 O 12 (BIT) particles, a reactive template for CBT, were mixed with other oxide and carbonate powders and unidirectionally aligned by extrusio…
We have developed a new class of metal-loaded nanoparticles that have potential as contrast agents for medical imaging. These polymeric materials have a core−shell morphology where the interior is a functionalized polymer, that provides high affinity for a specific metal, and the shell consists of a porous hydrophobic…
An article providing background on fundamentals of partial discharge, especially as related to field PD testing of cable systems.
The three-dimensional coordination polymers [Mn(dca)2(H2O)] (1) and [M(dca)(tcm)], M =Co (2), Ni (3), Cu (4), dca =dicyanamide, N(CN)2-, tcm = tricyanomethanide, C(CN)3-, have isomorphous structures. In 1 half the dca ligands coordinate directly (through all three nitrogen atoms) to three Mn atoms (all metal atoms are…
In the manganite ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ charge ordering occurs at a much higher temperature than the antiferromagnetic order ${(T}_{\mathrm{CO}}=250 \mathrm{K},$ ${T}_{N}=160 \mathrm{K}).$ The magnetic behavior of the phase ${T}_{N}<T<{T}_{\mathrm{CO}}$ is puzzling: its magne…
Textured Sr 0.53 Ba 0.47 Nb 2 O 6 ceramics with a relative density of >95% were fabricated using templated grain growth (TGG). Acicular KSr 2 Nb 5 O 15 template particles synthesized via a molten salt process were aligned by tape casting in a mixture of solid‐state‐synthesized SrNb 2 O 6 and BaNb 2 O 6 powders. The re…
A new class of mesoporous (nickel/platinum)-yttria-zirconia materials, denoted meso -(Ni/Pt)YZ, which may have utility as electrode material in solid oxide fuel cells (SOFCs), have been synthesized by aqueous co-assembly of glycometalates and metal complexes with a surfactant template. These materials form as solid so…
Dependent on the conditions, crystallisation of polymorphs from solvent may be under kinetic or thermodynamic control. In the latter case the nature of the solvent will be immaterial in respect of the polymorph produced. The conditions under which each of these factors may apply are analysed in detail. The transition…
Measurements of magnetoresistance and magnetization were carried out on ceramic samples of La0.5Pb0.5MnO3 and La0.5Pb0.5MnO3, containing 10 at. % Ag in a dispersed form. The results obtained for the resistivity at zero applied magnetic field exhibit a shallow minimum at the temperature T∼25–30 K which shifts towards l…