Spatial organization and patterning of gold nanoparticles on self-assembled biolipid tubular templates
Helically-patterned arrays of gold particles are formed using lipid tubules as templates.
Materials Literature
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A model of anisotropic anhysteretic magnetization
A model of hysteresis has been developed earlier in which the susceptibility depends on the displacement of the prevailing magnetization from the anhysteretic. This model does not take into account the effect of magnetocrystalline anisotropy in a material. In the current work, it has been shown that the effect of anis…
Physical Chemistry of Polymers: Entropy, Interactions, and Dynamics
A brief examination of some issues of current interest in polymer physical chemistry is provided. Emphasis is placed on topics for which the interplay of theory and experiment has been particularly fruitful. The dominant theme is the competition between conformational entropy, which resists distortion of the average c…
Comparison of Oxygen and Water Vapor Permeabilities of Whey Protein Isolate and β-Lactoglobulin Edible Films
Oxygen permeability (OP) and water vapor permeability (WVP) of whey protein isolate (WPI) and β-lactoglobulin (β-Lg) edible films were studied at three different levels of glycerol content. WVP and OP of WPI films were not statistically different from WVP and OP of β-Lg films. Although the presence of glycerol as plas…
Langmuir−Blodgett Film Formation from Fluorescence-Activated, Surfactant-Capped, Size-Selected CdS Nanoparticles Spread on Water Surfaces
Fluorescence-activated sodium hexametaphosphate stabilized CdS particles have been transferred from water into apolar organic solvents (chloroform and hexane) by dioctadecyldimethylammonium bromide (DODAB) and by cetyltrimethylammonium chloride (CTAC) and spread on water surfaces in a Langmuir film balance. Surface pr…
Excited State Dynamics of Phthalocyanine Films
Femtosecond pump−probe transient absorption measurements were performed for thermally evaporated polycrystalline vanadyl and lead phthalocyanine (VOPc and PbPc) films in order to obtain information about the excitation energy migration and relaxation. The films were shown to be composed of phase II and amorphous mater…
Characterization of Solution and Solid State Properties of Undoped and Doped Polyanilines Processed from Hexafluoro-2-propanol
We have investigated the changes in the molecular conformation, morphology, and conductivity of polyaniline as it transforms from the insulating emeraldine base (PANI-EB) to the conducting emeraldine salt (PANI-ES) in solutions of hexafluoro-2-propanol (HFIP) and in films processed from the same solvent. Since both PA…
Mechanical Properties and Water Vapor Permeability of Edible Films from Whey Protein Isolate and Sodium Dodecyl Sulfate
The ability of sodium dodecyl sulfate (SDS) to plasticize edible films from whey protein isolate (WPI) was assessed. SDS was not able to plasticize WPI films on its own, but it was an effective coplasticizer in films containing either sorbitol or glycerol as the main plasticizer. In films that contained sorbitol, a ma…
Preparation of uniform zinc oxide colloids by controlled double-jet precipitation
A new and simple method for the preparation of uniform zinc oxide colloidal particles of different morphologies by controlled double-jet precipitation is described. Scanning electron microscopy and X-ray diffraction data indicate that the solids generated under different conditions have identical crystallite structure…
Soluble, Rigid-Rod Polyamide, Polyimides, and Polyazomethine with Phenyl Pendent Groups Derived from 4,4‘‘-Diamino-3,5,3‘‘,5‘‘-tetraphenyl-p-terphenyl
The reaction of 4,4‘-(1,4-phenylene)bis(2,6-diphenylpyrylium tetrafluoroborate) with nitromethane afforded 4,4‘‘-dinitro-3,5,3‘‘,5‘‘-tetraphenyl- p -terphenyl, which was catalytically hydrogenated to the corresponding diamine. The latter was used as starting material for the preparation of new rigid-rod polyamide, pol…
Microphase Separation in Star Block Copolymers of Styrene and Isoprene. Theory, Experiment, and Simulation
The order−disorder transition (ODT) and the ordering kinetics have been studied in four-arm star diblock copolymer melts of styrene (corona) and isoprene (core) by rheology and SAXS. The results are compared with the corresponding linear diblock and show that the transition shifts in the direction predicted by theory.…
Texture predictions using a polycrystal plasticity model incorporating neighbor interactions
A viscoplastic model is presented for distributing the deformation applied to a polycrystal in a non-uniform fashion among the constituent crystals. Interactions with surrounding crystals are incorporated in the calculation of the deformation rate of each crystal through an appropriately defined local neighborhood. A…
Synthesis of Peroxo-Modified Anatase Sol from Peroxo Titanic Acid Solution
A peroxo titanic acid (PTA) solution has been prepared by mixing titanic acid wet gel and hydrogen peroxide solution. The PTA solution was a neutral, transparent, stable liquid. The PTA crystallized to form an anatase phase after calcination at a temperature above 250°C. When the PTA solution was autoclaved at a tempe…
Photochemical investigations of functionalised 1,4,7,10-tetraazacyclododecane ligands incorporating naphthyl chromophores
The fluorescence properties of two macrocyclic ligands incorporating bis-(β-naphthyl amide) groups, –CH2CON(CH2C10H7)2, as fluorophores, have been studied in water and acetonitrile. The ligands exhibit distinctive luminescence behaviour in the presence of quenching (e.g. Pb2+, Ni2+, Cu2+ and Eu3+) and non-quenching io…
Surface Characterization of Polypyrrole-Coated Polystyrene Latex by X-ray Photoelectron Spectroscopy
The surface composition of electrically conductive polypyrrole-coated polystyrene latex particles has been examined by X-ray photoelectron spectroscopy (XPS). We have systematically characterized the surface of polystyrene (PS), poly( N -vinylpyrrolidone) (PNVP), chloride-doped polypyrrole (PPyCl) powder, and PNVP-sta…
Characterization, Surface Area, and Porosity Analyses of the Solids Obtained by Acid Leaching of a Saponite
New deposits of saponite have been described recently in the Madrid Basin (Madrid and Toledo provinces, Central Spain), a zone very rich in Mg silicates, especially in sepiolite. This is the first time that the high surface area saponitic material from Yunclillos deposit (Toledo province) is described. The acid treatm…
Single-site metal alkoxide catalysts for ring-opening polymerizations. Poly(dilactide) synthesis employing {HB(3-Butpz)3}Mg(OEt)
{HB(Butpz)3}Mg(OEt) in CH2Cl2 at 22 °C acts as a catalyst precursor for the fast, stereoselective, ring-opening polymerization of L,L-dilactide by the acyl cleavage mechanism yielding isotactic poly(L,L-dilactide) with PDI ≈ 1.2.
Synthesis and characterization of a shock-synthesized cubic B–C–N solid solution of composition BC 2.5 N
A cubic BC2.5N solid solution (c-BC2.5N) was synthesized in 18% yield by shock-compression of a hexagonal BC2.5N compound. c-BC2.5N was confirmed to have a diamond structure without a long range order of atomic arrangement. The material is a polycrystal composed of microcrystals of 5–20 nm in size. All constituent ato…
New Procedures for the Synthesis and Analysis of 5,10,15,20-Tetrakis(sulphophenyl)porphyrins and Derivatives through Chlorosulphonation
Tetrakisarylporphyrins are conveniently chlorosulphonated in high yields.These chlorosulphonyl compounds may he converted in high yield into sulphonic acid derivatives through reaction with a variety of nucleophiles so as to give, for example, the free sulphonic acid, a sulphonamide or a sulphonate ester.
Silylation To Improve Incorporation of Zeolites in Polyimide Films
The silylation of borosilicate with APTS ((γ-aminopropyl)triethoxysilane) is studied as a tool to improve zeolite incorporation in PI (polyimide) films. Among other experimental parameters, a quantification of the zeolite outer surface silanols is performed in order to determine the most appropriate silylation conditi…