Materials Literature
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This paper reports interactions and possible incompatibilities in solid dispersions of hydrophobic drugs with hydrophilic carriers, with solubility parameters employed as a means of interpreting results. Systems containing ibuprofen (IB) and xylitol (XYL) in varying proportions and systems of IB with other sugars and…
Superhydrophobic surfaces are those with a water contact angle greater than 150°, and these are desired for various industrial products. Such surfaces have been achieved for boehmite and silica films, which were roughened by the sublimation of aluminum acetylacetonate during calcination. The Figure shows the shape of…
Diatoms are the most species-rich group of algae. They are ecologically widespread and have global significance in the carbon and silicon cycles, and are used increasingly in ecological monitoring, paleoecological reconstruction, and stratigraphic correlation. Despite this, the species taxonomy of diatoms is messy and…
The dependence of polyelectrolyte multilayer thickness on salt concentration, salt type, solvent quality, deposition time, and polymer concentration is evaluated. Polymers are deposited on spinning silicon wafers. For the strong polycation/polyanion pair studied, film thickness is approximately proportional to the num…
Methods of synthesis, molecular and electronic structures and electrophysical, optical and magnetic properties of ternary and quaternary chalcogenides based on copper, silver and gold are considered. The possibility of the synthesis of chalcogenide analogues of high-temperature superconductors is discussed. The prospe…
The influences of the type and concentration of α-olefin (1-hexene, 1-octene, 1-decene, 1-octadecene, 4-methyl-1-pentene) on the mechanical behavior and crystallinity degree of some ethylene/α-olefin copolymers obtained by metallocene catalysts were studied by means of stress/strain experiments. The crystallinity degr…
The dynamic mechanical properties of rubber vulcanisates filled with cryogenically pulverized polyurethane foam particles, used as a reinforcing filler, were investigated with respect to storage modulus (E′), loss modulus, and the variation of glass transition temperature. Two rubbers were using styrene–butadiene rubb…
Calcium carbonate highly filled composites of a polyolefin plastomer (POP), and its blends with postconsumer linear low-density or high-density polyethylene (PC-LLDPE or PC-HDPE) were prepared and evaluated. The mechanical properties of compounded POP and its blends were compared with those of a PVC–calcium carbonate…
The effect of water on the morphology of four ethylene vinyl alcohol copolymers (EVOH) with different ethylene contents was studied by differential scanning calorimetry (DSC). EVOH film samples equilibrated in controlled atmospheres at different relative humidities (RH) and 23°C were analyzed. Under dry conditions, th…
The thermal, viscoelastic, and mechanical behaviors of three binary blends of ethylene 1-octene copolymer (EOC) regarding the melt index and density, one component made by Ziegler–Natta (FA and RF in abbreviation of the commercial name) and the other by metallocene catalysts (FM, EN and PL in abbreviation of the comme…
The numerical simulation of concrete subjected to high dynamic loadings, e.g. explosive charges, is a subject of current research. This kind of loading produces extremely high pressures in the megabar region and strain rates up to 108(1/s). It is obvious that one will not succeed by only using the classical field of s…
We derive the modified Young's equation for the contact angle of a fluid droplet on a rigid substrate using an interface displacement model and identify the line tension with the excess free energy per unit length calculated previously for a straight three-phase contact line.
The electrochemistry of a chemically prepared polypyrrole/poly(styrene-4-sulfonate) powder has been investigated by cyclic voltammetry and impedance spectroscopy in a variety of aqueous electrolytes. The facile p-doping/undoping of thick layers of the polymer composite is shown to be due to the high ionic conductivity…
Anionic ring-opening polymerization of ε-thionocaprolactone was examined. When organolithiums, Grignard reagents, and lithium tert -butoxide were used as the initiators, the corresponding polythiocarboxylic- O -ester was selectively formed. When potassium tert -butoxide and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) wer…
EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge structure) techniques have been used to study the structural evolution of nanocomposites constituted of nickel oxide nanoparticles embedded into an amorphous silica matrix during their sol−gel preparation. EXAFS data show that no in…
The molecular structural volume change (as determined by laser-induced optoacoustics), Δ V R ∼−18 Å 3, accompanying triplet state formation of free base 5,10,15,20-tetrakis-(4-sulfonatophenyl)-porphine (TSPP 4 - ) in aqueous solutions of pH > 5.5, was markedly decreased to −5 Å 3 for the dimer, to −3.5 Å 3 for ZnTSPP…
The contributions to the thermodynamics of liquid SPC/E water from its inherent structures have been determined over a broad range of temperature and density (220−500 K, 0.8−1.25 g/cm 3 ). Molecular dynamics simulations of shifted-force SPC/E water give a retracing locus of density maxima in the equilibrium liquid wit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOrganometallic Sandwich Chains Made of Conjugated Polyenes and Metal−Metal ChainsTetsuro Murahashi, Eiko Mochizuki, Yasushi Kai, and Hideo KurosawaView Author Information Department of Applied Chemistry, Faculty of Engineering Osaka University, Suita, Osaka, 565-0871,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCrystalline Salts of Na- and K- (Alkalides) that Are Stable at Room TemperatureJineun Kim, Andrew S. Ichimura, Rui H. Huang, Mikhail Redko, Richard C. Phillips, James E. Jackson, and James L. DyeView Author Information Department of Chemistry and Center for Fundamental…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLight Induced Excited Pair Spin State in an Iron(II) Binuclear Spin-Crossover CompoundJean-François Létard, José Antonio Real, Nicolás Moliner, Ana B. Gaspar, Laurence Capes, Olivier Cador, and Olivier KahnView Author Information Laboratoire des Sciences Moléculaires I…