Materials Literature
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The combination of short-range attractions and long-range repulsions can lead to interesting clustering phenomena.In particular there are strong indications that the colloidal cluster phase is in fact a manifestation of such a competition.Here we compute the stability boundary of the cluster phase by invoking counter-…
The structure of the Baxter adhesive hard sphere fluid is examined using computer simulation. The radial distribution function (which exhibits unusual discontinuities due to the particle adhesion) and static structure factor are calculated with high accuracy over a range of conditions and compared with the predictions…
The construction of amperometric immunosensors to cholera antitoxin immunoglobulins were shown to have improved sensitivity when the cholera toxin B subunit biorecognition entity was linked to an electrogenerated biotinylated polypyrrole film copolymerized with pyrrole-lactobionamide monomer. The copolymer exhibits gr…
We review some results on the dynamics of gelation phenomena, obtained via a lattice model and via molecular dynamics using a DLVO potential. This study allowed us to make a connection between classical gelation and the phenomenology of colloidal systems, suggesting that gelation phenomena in attractive colloids at lo…
Thermal stability and dispersion of CeO 2 supported on Al 2 O 3 is greatly improved by insertion of ZrO 2 into the CeO 2 lattice. It is shown that homogeneous nanosized Ce x Zr 1 - x O 2 solid solutions can be prepared on the Al 2 O 3 surface by using a citrate complexation synthesis method. Investigation of effects o…
A simulation model for the solvent-mediated transformation from the metastable α-form to the stable β-form of l -glutamic acid ( l -Glu) was developed using the concept of the population balance. The solvent-mediated transformation process is a combination of the dissolution of the α-form and the nucleation and subseq…
We studied clustering and gelation in low-volume-fraction () hard-sphere colloids, some with charge, with added non-adsorbing polymers. The range of the effective 'depletion' attraction induced by the polymers between the particles is of the particles' diameter. The effects of density mismatch between the particles an…
This study describes the development of a surface plasmon fluorescence spectroscopy (SPFS)-based sandwich immunoassay, for the detection of free prostate-specific antigen (f-PSA). The commercial CM5 chip (Biacore) was integrated into the SPFS-based assay making use of its three-dimensionally extended dextran architect…
A high-nuclearity {W36} isopolyoxotungstate cluster, [H12W36O120]12-, with a triangular shape has been isolated by using an encapsulating organic cation, protonated triethanolamine. In analogy to an 18-crown-6 crown ether, the cluster captures a potassium ion, present in trace amounts in the reaction system, within it…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Conductors and Superconductors Based on Trihalides of BEDT-TTF and Some of Its AnaloguesRimma P. Shibaeva and Eduard B. YagubskiiView Author Information Institute of Solid State Physics and Institute of Problems of Chemical Physics, Russian Academy of Sciences, Che…
Pb(Zn$_{1/3}$Nb$_{2/3}$)O$_{3}$ is one of the simplest representatives of the lead ferroelectric relaxors. Its solid solution with PbTiO$_{3}$, at concentrations near the morphotropic phase boundary, is especially important. In this paper, we apply the tested earlier on Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ approach, to ana…
In this paper, impedance spectroscopy study was performed to establish the electrical property and microstructure relations of the as-deposited and post-annealed polycrystalline CCTO films prepared on Pt/Ti/SiO2/Si (100) substrates by pulsed-laser deposition (PLD). Our results demonstrated that the as-deposited polycr…
Ultrasonic irradiation of slurries produces high velocity impacts between solid metal particles that are sufficient to cause interparticle melting. Sonication of 5 mum Zn powder as a slurry in alkanes, for example, produces dense agglomerates 50 mum in diameter consisting of approximately 1000 fused particles. Particl…
The equilibrium phase behavior of 43 linear poly(isoprene- b -styrene- b -ethylene oxide) (ISO) triblock copolymer melts, with molecular weights that place these materials near the order−disorder transition, is reported. Ordered phase morphologies were characterized using small-angle X-ray scattering, transmission ele…
This study demonstrates a novel approach toward development of advanced chemical sensors based on chemically functionalized single-walled carbon nanotubes (SWNTs). SWNTs with covalently attached poly( m -aminobenzene sulfonic acid), SWNT-PABS, have shown improved sensor performance for detection of NH 3 . Compared to…
We apply the recently developed plasmon hybridization method to a solid nanosphere interacting with a metallic surface. We show that the plasmon energies of the nanoparticle exhibit strong shifts with nanoparticle−surface separation. Depending on the energy of the surface plasmon, nanoparticle plasmons can either red…
Luminescence properties of highly <100>-oriented Y 2 O 3 :Tb 3+ whiskers obtained by chemical vapor deposition on Si substrate have been investigated over a wide temperature range for different dopant concentrations. A considerable thermally stimulated increase of the green Tb 3+ emission intensity was found in the te…
The leakage current in ferroelectric thin films is one of the most pertinent issues for their application in microelectronics. We argue that the leakage current in ferroelectric films at low electric field can arise from interband tunneling as opposed to Fowler–Nordheim tunneling at high electric field. We substantiat…
The piezoelectric properties of sodium bismuth tantalate Na 0.5 Bi 2.5 Ta 2 O 9 (NBTa) dense ceramics were determined using 0.1 wt% Mn-doped samples. The ferroelectric properties of the NBTa ceramics were confirmed. The remanent polarization P r and coercive field E c were 15.5 µC/cm 2 and 81.5 kV/cm at room temperatu…
Supercritical carbon dioxide (scCO2) annealing enhances the hydrophobicity of the surfaces of asymmetric perfluorinated block copolymers. X-ray photoelectron spectroscopy (XPS) and contact angle measurement reveal that the surface domains of the fluorinated block (PF) of poly[styrene-block-4-(perfluorooctylpropyloxy)s…