Materials Literature
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The swelling behavior of the complex film formed from pectin and chitosan was studied. The swelling degree increased sharply in the case of pH less than 2 and larger than 7. The swelling mechanisms of the complex film in acidic and alkaline medium are discussed, respectively. Moreover, the swelling degree could be mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChromophoric Self-Assembled SuperlatticesShlomo Yitzchaik and Tobin J. MarksView Author Information Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208-3113 Cite this: Acc. Chem. Res. 1996, 29, 4, 197–202Publication Da…
The aging of high-density polyethylene (HDPE) when exposed to drastic climatic conditions (Canadian winter, characterized by low temperature and abrupt temperature variations between the night and the day) was studied. The importance of degradation was determined by evaluating the microstructural changes in HDPE (i.e.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe Ionic Auxiliary Concept in Solid State Organic PhotochemistryJanet N. Gamlin, Ray Jones, Mordechai Leibovitch, Brian Patrick, John R. Scheffer, and James TrotterView Author Information Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, Canada…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiscrete Silanetriols: Building Blocks for Three-Dimensional MetallasiloxanesRamaswamy Murugavel, Vadapalli Chandrasekhar, and Herbert W. RoeskyView Author Information Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, GermanyCite this: Acc. Chem. Res. 19…
We present a new method for establishing and exploiting a multicanonical distribution for Monte Carlo sampling across an extended space of macrostates, with particular reference to the study of first-order phase transitions. The method exploits the information contained in measurements of the transition rate between m…
Self-diffusion in a suspension of spherical particles in steady linear shear flow is investigated by following the time evolution of the correlation of number density fluctuations. Expressions are presented for the evaluation of the self-diffusivity in a suspension which is either raacroscopically quiescent or in line…
The vibrational spectrum of C$_{60}$ is compared to the spectrum of a classical isotropic elastic spherical shell. We show correlations between the low frequency modes of C$_{60}$ and those of the spherical shell. We find the spherical model gives the approximate frequency ordering for the low frequency modes. We esti…
A system of three particles undergoing inelastic collisions in arbitrary spatial dimensions is studied with the aim of establishing the domain of ``inelastic collapse''---an infinite number of collisions which take place in a finite time. Analytic and simulation results show that for a sufficiently small restitution c…
A phenomenological model of the evolution of an ensemble of interacting dislocations in an isotropic elastic medium is formulated. The line-defect microstructure is described in terms of a spatially coarse-grained order parameter, the dislocation density tensor. The tensor field satisfies a conservation law that deriv…
Defect structures in a homoepitaxial diamond film grown by chemical vapor deposition have been studied by cross-sectional transmission electron microscopy. Many interstitial dislocation loops are discerned in the (001) interface. The internal region grown on the (11̄1) facet comprises stacking faults and twins, while…
We present the results of large-area (20 cm2) diamond deposition from a scaled-up stagnation-flow reactor. The reactor uses a unique nozzle geometry that optimizes reagent gas usage. The premixed acetylene–oxygen–hydrogen flames were operated in a highly strained configuration, allowing uniform deposition of diamond w…
Impulsive stimulated light scattering experiments were carried out on an ionic glass former Ca0.4K0.6(NO3)1.4 to determine the temperature dependence of the Debye–Waller factor fq(T) in the q→0 limit and to investigate the structural relaxation dynamics. A square-root cusp anomaly was observed in fq→0(T) at a crossove…
We report the realization of a bright and stable electroluminescent Schottky diode based on aluminum-porous silicon junction. White light, visible in normal daylight, is emitted when a reverse bias is applied to the device, promoting the junction breakdown. The device has a fast (100 ns) rise time of the light emissio…
Several reports of electron paramagnetic resonance experiments performed on the spin - Peierls compound have appeared so far, but none of them have precisely explained the origin of the line broadening and the temperature dependence of both the linewidth and the resonance field, all of which differ from those of conve…
We present an extensive study of the approximant phases present in the Al - Cu - Fe phase diagram in the vicinity of the icosahedral phase. In addition to the rhombohedral and the two pentagonal phases previously observed, a new orthorhombic approximant has been identified. The identification of these structures, via…
A complete process compatible with conventional Si technology has been developed in order to produce a bipolar light-emitting device. This device consists of a layer of light-emitting porous silicon annealed at high temperature (800–900 °C) sandwiched between a p-type Si wafer and a highly doped (n+) polycrystalline S…
We have applied extended x-ray absorption fine structure (EXAFS) spectroscopy to study the cation distribution in a series of spin-sprayed NiZn-ferrite films. A least-squares fitting of experimental EXAFS data with theoretical, multiple-scattering, EXAFS data allowed the quantitative determination of site distribution…
The C 1s and O 1s core-level photoabsorption spectra of poly[2-methoxy,5-(2′-ethyl- hexoxy)-1,4-phenylene vinylene] (MEH-PPV) before and after exposure O2 and broadband visible light were recorded to determine the degradation pathway for this polymer. The change in the O 1s spectra as a function of exposure demonstrat…
In a series of papers, we have reported the results of dielectric, magnetic and magnetoelectric studies of (R = rare earth between Nd and Lu, Y or Bi), proposing the possibility of ferroelectricity in these oxides, but the direct demonstration of ferroelectricity was lacking. In this paper we present the results of py…