Materials Literature
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cyclicpoly(butylene terephthalate) oligomers, c-PBT, weresuccessfully polymerized to a high molecular weightPBT employing the advantages of the low viscosity (17cP) of c-PBT oligomers and lack of chemical emissionsduring polymerization. In this research, we intend toascertain the possibility of producing high-performa…
Polyelectrolyte multilayers were built up layer by layer from a polycation (poly( l -lysine) (PLL)) solution and polyanion solutions containing simultaneously poly( l -glutamic acid) (PGA) and poly( l -aspartic acid) (PAA). Quartz crystal microbalance-dissipation (QCM-D) measurements revealed that, for a given number…
Surfactant-templated silica thin films are potentially important materials for applications such as chemical sensing. However, a serious limitation for their use in aqueous environments is their poor hydrolytic stability. One convenient method of increasing the resistance of mesoporous silica to water degradation is a…
Lattice defects in two-dimensional hexagonal arrays primarily take the form of dislocations, point defects that lie at the mutual terminus of two incomplete rows of material. The dislocation core is composed of one 5-fold and one 7-fold coordinated domain within the otherwise hexagonally coordinated lattice. Using sca…
Solvent uptake and swelling of ultrathin spin-coated polyacrylamide films in the presence of saturated vapor of water at room temperature was studied using gravimetric and X-ray reflectivity methods. Solvent uptake was observed to be a faster process, compared to swelling, governed by the Fickian dynamics of the diffu…
Here we show that the B -site cation (Fe/Mo) ordering in the double-perovskite magnetoresistor, Sr 2 FeMoO 6, is controlled by either kinetics or thermal equilibrium depending on the temperature range. To enhance the ordering, long synthesis periods at moderate temperatures are thus required. Employment of a special o…
IRAS studies of CO adsorption on the Au(110)−(1 × 2) surface were performed as a function of CO pressure and sample temperature. It was found that with increasing coverage, the CO IRAS absorption shifts red from 2118 to 2108 cm -1 . Clausius−Clapeyron data analysis yielded a heat of CO adsorption (−Δ H ads ) of 10.9 k…
The change in the electronic structure of Au(n)- clusters induced by the exchange of an Au atom by hydrogen is studied using photoelectron spectroscopy. Au anion clusters react with one hydrogen atom but not with molecular hydrogen. The spectra of Au(n)- and Au(n-1)H- clusters show almost identical features for n > 2…
Single molecule conformations and associate morphologies for polystyrene/poly(2-vinylpyridine) (PS 7 −P2VP 7 ) heteroarm star copolymer, formed in controlled environment and deposited onto mica or Si wafers, have been studied by atomic force microscopy (AFM) with molecular resolution. At concentrations below 0.01 mg/m…
The synthesis of a water-soluble anionic silver 2-mercaptonicotinate complex having effective antibacterial and antifungal properties is described. Its structure has been confirmed to be a hexameric cluster by an X-ray diffraction analysis of a mixed Na(+)/Tris(+) salt (Tris(+) = tris(hydroxymethyl)methylammonium cati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHydrogen-Bonded Polymer Capsules Formed by Layer-by-Layer Self-AssemblyVeronika Kozlovskaya, Salim Ok, Alioscka Sousa, Matthew Libera, and Svetlana A. SukhishviliView Author Information Department of Chemistry and Chemical Biology,…
A series of observations of polymer sheathing in multiwalled carbon nanotube (MWCNT)−polycarbonate composites are presented. This sheathing was observed in images of the composite fracture surface and is consistent with diameter distributions of the as-received and embedded MWCNTs. A novel nanomanipulation experiment,…
The use of metal ion-induced polymerizations of a ditopic ligand offers a facile route to the preparation of organic/inorganic hybrid materials. Such metallo-supramolecular polymers potentially offer the functionality of the metal ion along with the processibility of a polymer. We report, herein, the preparation of ge…
In the present study, we show the isolation and characterization of the protein haemoporin, which constitutes the second most abundant protein fraction in the haemolymph of the marine gastropod Aplysia californica. Although Aplysia is commonly used to investigate the molecular basis of learning, not much is known abou…
Chlorine gas evolution was investigated by bubbling O 2 gas into molten CaCl 2 at temperatures higher than 1173 K, although a thermodynamic analysis shows almost no progress of the reaction 2CaCl 2 + O 2 = 2CaO + Cl 2 . To break the thermodynamic limitation, chlorine gas slightly evolved was quickly removed from the r…
Abstract Multifunctional molecules were designed to produce microgels with specific structures. Both static light scattering and dynamic light scattering were employed to determine the fractal dimension of the microgels. The protein, avidin, was strongly bound to four biotin moieties. Biotin was attached covalently to…
Single bubble sonoluminescence (SBSL) is realized in air-saturated water at ambient pressure and room temperature. The behavior is similar to SBSL in degassed water, but with a higher spatial variability of the bubble position. A detailed view on the dynamics of the bubbles shows agreement between calculated shape sta…
We have reported the relaxation dynamics of charge carriers in mixed alkali fluoride glasses of compositions 50ZrF4–10BaF2–2YF3–3AlF3–(35−x)LiF–xNaF; where 0⩽x⩽35. We have analyzed the relaxation data for these mixed alkali glasses, taken in the frequency range from 10 Hz to 2 MHz and in the temperature range from roo…
We report the electrical and thermal transport properties, including electric resistivity (ρ), Seebeck coefficient ( S ) and thermal conductivity (κ) of icosahedral Al 70 Pd 22.5 Re 7.5 quasicrystals in the temperature range between 10 and 300 K. Four Al 70 Pd 22.5 Re 7.5 samples with a resistivity ratio ranging from…
Neutron scattering measurements were carried out for liquid Se, liquid Te, and liquid Te50Se50. The results are discussed in the context of semiconductor-to-metal transition. As to liquid Te50Se50, the vibrational modes show a remarkable change when the semiconductor-to-metal transition occurs by temperature increase.…