Materials Literature
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The dynamics of liquid-like ordered giant colloidal micelles in the wave vector range around the peak of the structure factor is explored using photon correlation spectroscopy. No thermodynamic slowing down of the collective density fluctuations is found, whereas the long-time diffusion coefficient follows the concent…
Two clinoptilolites from genetically different volcanoclastic formations have been studied. Both deposits are located in the Logudoro region (North-Western Sardinia, Italy) within epiclastic and pyroclastic formations related to calcalkaline volcanic activity. Chemical characterization performed by electron microprobe…
We report the first observations of nonmonotonic changes in the second virial coefficients of protein solutions, ${B}_{2}$, as the concentration of nonadsorbing polymer is increased. The observed minimum in ${B}_{2}$ cannot be predicted from standard depletion interaction energy models and is closely associated with p…
Hydrogen incorporation in strontium titanate thin films grown in a high vacuum environment by rf magnetron sputtering on MgO(001) substrates was investigated by nuclear resonance analysis. The amount of hydrogen in the films is strongly affected by the growth temperature. Films deposited at or below 200 °C have a clos…
The room-temperature unit-cell volumes of synthetic hydroxylapatite, Ca 5 (PO 4 ) 3 OH, fluorapatite, Ca 5 (PO 4 ) 3 (F (sub 1-x) ,OH x ) with x = 0.025, and chlorapatite, Ca 5 (PO 4 ) 3 (Cl (sub 0.7) ,OH (sub 0.3) ), have been measured by high-pressure (diamond anvil-cells) synchrotron X-ray powder diffraction to max…
In natural and synthetic materials having non-racemic chiral centers, chirality and structural ordering each play a distinct role in the formation of ordered states. Configurational chirality can be extended to morphological chirality when the phase structures possess low liquid crystalline order. In the crystalline s…
A kinetic–thermodynamic model is presented to predict the total porosities of macroporous copolymer networks formed by free-radical crosslinking copolymerization of styrene (S) and commercial divinylbenzene (DVB, a mixture of meta and para DVB isomers and ethylstyrene). The kinetic part of the model predicts, based up…
The research in this article explores the response of semicrystalline isotactic polypropylene to gamma radiation in air, and relates the morphological changes of the polymer to corresponding changes in mechanical properties. The effect of the initial morphology of the polymer on its response to irradiation is consider…
The hydrolytic degradation of two poly(ester amide)s derived from sebacic acid, dodecanediol, and alanine in both the quiral L configuration and the racemic L,D mixture has been studied. The degradation was monitored by following the changes in intrinsic viscosity, mass loss, chemical constitution, and mechanical prop…
N-(2-Hydroxy)propyl-3-trimethylammonium chitosan chloride (HTCC) was synthesized by the reaction of glycidyltrimethylammonium chloride (GTMAC) and chitosan. The reaction product was a water-soluble chitosan derivative, and showed excellent antimicrobial activity. HTCC was blended with polyacrylonitrile (PAN) using an…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRelations between Surface Energy and Surface Potentials of a Nitrogen Plasma-Modified PolypropyleneF. Poncin-Epaillard and You-Im ChangView Author Information Laboratoire de Physique et Chimie des Matériaux Polymères, Université du Maine, Avenue O. Messiaen, 72000 Le Mans, Fran…
Crystallization in suspensions of colloidal hard spheres with a volume fraction of 0.631 ± 0.004, and a polydispersity of less than 3%, is studied experimentally. The mass density of the solvent is almost equal to that of the particles. Normal (1 g -like) gravity conditions are simulated by centrifugation. It is shown…
π-Conjugated poly(hydroquinone)s and poly( p -benzoquinone)s have been prepared, and their optical and redox behaviors have been studied. Poly(hydroquinone-2,5-diyl), PPP-2,5-OH, with a weight-average molecular weight of 8500 (determined by the light scattering method) was soluble in DMF. The π−π* absorption peak of h…
Dynamic surface tension (DST) experiments have been combined with time-resolved ellipsometry (TRE) to study the adsorption kinetics of symmetric triblock copolymers at the air−water interface. The equilibrium behavior of these adsorbed monolayers has been studied in the preceding paper in this issue (part 1), pointing…
Electrochemical and electrochromic properties of a series of cathodically coloring copolyimides containing a perylene diimide moiety are reported. Well-defined redox responses were obtained in solutions containing large cation electrolytes that can interact well with the reduced intermediates of perylene diimide. Reve…
Surface pressure isotherms and ellipsometric measurements of monolayers of two triblock symmetric copolymers, poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) (PEO−PPO−PEO), at the air−water interface have been carried out. These copolymers are water-soluble, and the difference in hydrophobicity between…
We present an experimental study on the swelling of polyelectrolyte brushes covalently attached to planar solid surfaces in contact with humid air. Monolayers of poly- N -methyl-[4-vinylpyridinium]iodide (MePVP) with film thicknesses of several hundred nanometers were used in this study. The MePVP brushes were attache…
Monodisperse emulsions can be obtained by shearing a crude polydisperse one. The aim of this paper is to discover the required conditions for droplet fragmentation and resulting monodispersity, independently of the chemical nature of the system. We particularly examine (i) the role of the initial emulsion viscoelastic…
Quasicrystals are assumed to be electronically stabilized by a Hume-Rothery type mechanism. This explains most of the peculiar properties of quasicrystals. The stabilization is investigated by electronic transport properties, as they depend sensitively on the stabilizing interaction between the static structure and th…
This paper deals with the analytic derivation of a complete equation of state (EOS) for solids from shock-wave data in the range of pressures and temperatures, attained by detonation of chemical explosives. The caloric, the thermal and the incomplete EOS are determined as well. An equation for the shock temperature al…