Materials Literature
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We have investigated the kinetics of the acid-catalyzed hydrolysis of ethyl, propyl, and butyl acetates in aqueous binary mixtures of ethanol and of 1,4-dioxane without sonication and under ultrasound at 22 kHz. Various rate enhancements were found in the region from pure water up to 50 wt % ethanol and 60 wt % dioxan…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionMolecular Logic: A Half-Subtractor Based on Tetraphenylporphyrin [J. Am. Chem. Soc. 2003, 125, 11198−11199]. Steven J. Langford and Trevor YannCite this: J. Am. Chem. Soc. 2003, 125, 48, 14951Publication Date (Web):Octob…
Thermodynamic properties of bovine pancreatic trypsin inhibitor (BPTI) hydrated by up to 1600 water molecules, i.e., a ratio of the weight of water to that of protein, h, from 0 to ∼4.5, are studied by molecular dynamics (MD) simulation and normal-mode analysis (NMA). Temperatures range from 100 to 300 K to include th…
Particle size control is of great importance to the pharmaceutical industry and is a key factor in product performance. Mechanical size reduction methods have some significant drawbacks. Sonocrystallisation, the use of power ultrasound in crystallisation, is a method of generating particles of controlled size, and thi…
We have developed a general method for aligning anisotropic materials by using carbon nanotubes to influence order in the surrounding material. Specifically, we have shown that carbon nanotubes seed the formation of oriented domains in a liquid crystalline polymer (LCP). Using polarized light microscopy, we have obser…
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…