Materials Literature
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High-resolution polarized absorption and fluorescence spectra of ${\mathrm{Pr}}^{3+}$ in LiY${\mathrm{F}}_{4}$ were measured at temperatures between 10 and 300\ifmmode^\circ\else\textdegree\fi{}K. Energy-level assignments were made assuming electric-dipole transition selection rules for ${S}_{4}$ site symmetry. Forty-…
The room-temperature Brillouin spectra of 16 optical glasses of varying composition have been measured. Sound velocities for both transverse and longitudinal waves were determined along with the Pockels electro-optic coefficients ${p}_{12}$ and ${p}_{44}$. The damping parameter for the longitudinal phonons was obtaine…
Various properties of dielectric thin films are discussed in this paper: refractive index and absorption coefficient, light scattering, structure, microstructure, density, gas sorption, chemical composition, homogeneity, adhesion, hardness and mechanical stress, and environmental influences.
Ion mobilities and volume recombination coefficients in sulphur hexafluoride were measured in the pressure range 0.25-21 bar. At higher pressures proportionality between recombination coefficient and the sum of ion mobilities is observed. The mobilities and the recombination coefficient were found to vary with pressur…
The electrical resistivity and temperature coefficient of the resistivity of polycrystalline aluminium films (500-1700 AA) deposited on to a glass substrate were measured in situ at temperatures of 50, 100 and 140 degrees C. The effect of grain boundary scattering was analysed using the Mayadas-Shatzkes theory (1970).…
Infrared absorption and luminescence measurements of substitutional Cr 2+ (d 4 ) in the II-VI compounds ZnS, ZnSe, ZnTe and CdTe are reported. The experimental results are interpreted in the framework of crystal field theory with spin-orbit coupling and a substantial Jahn-Teller interaction in the 5 T 2 ground state a…
The cationic complex (2-hydroxyethanethiolato)(2,2',2''-terpyridine)platinum(II), [(terpy)Pt(HET)]+, binds cooperatively to poly(A).poly(U) by intercalation. The melting temperature of poly(A).poly(U) in low-salt buffer is increased by 6 degrees C in the presence of [(terpy)Pt(HET)]+, indicating stabilization of the d…
Abstract The changes in molecular weight and molecular weight distribution of PVC degraded in presence of maleic anhydride, benzoquinone and anthraquinone were studied by gel permeation chromatography. Chain scission and crosslinking reactions were indicated on the basis of M̄ n and M̄ w of degraded samples. Crosslink…
Surfactants and Interfacial Phenomena Milton J. Rosen Bridging the gap between purely theoretical aspects of surface chemistry and the purely empirical experience of the industrial technologist, this book applies theoretical surface chemistry to understanding the action of surfactants in modifying interfacial phenomen…
The free-volume distribution in a simulated Lennard-Jones liquid is heterogeneous. Chains of holes, appearing as segments rather than a continuous network, have lifetimes that are brief compared with the mean vibration period of the atoms. Larger isolated holes persist for longer times. If the chains are interpreted a…
Carboxyl content of cellulose half-acid ester derivatives was determined by the calcium acetate method and by the absorption of silver from silver meta-nitrophenolate solutions. Both methods utilize the acidity of the carboxyl proton in an ion-exchange reaction, thereby producing a salt. With both the calcium acetate…
With the use of ESR spectroscopy NO/sub 2/ molecules have been found in minor quantities in a ..gamma..-irridiated single crystal of uridine 5'-phosphate. NO/sub 2/ is produced from the built-in impurities in a single crystal. The concentration of the NO/sub 2/ molecules depends on the commercial source of the compoun…
PMR spectroscopy and lanthanide shift reagents were used to determine sequence distribution of units of poly(dimethyldian-phenolphtalein)terephthalate. The calculated values of degree of randomness confirm the theory that the copolyester obtained at the isokinetic temperature (200°C) has random distribution of comonom…
A direct observation of the influence of an externally applied electrostatic field on the sublimation steps on (100) surfaces of KCl is reported. Typically, round-cornered square spirals were found to be distorted into round-cornered rhombical spirals in the presence of a field. The results are interpreted in terms of…
Abstract The Raman spectrum of pure liquid para ‐nitroaniline ( p ‐NA) was studied between 150 and 220°C, and compared with those of the crystal and solutions. The 1270–1350 cm −1 region is the most significant. The ν line, very weak for the solid, becomes intense in the spectrum of molten p ‐NA. Except for one case,…
Processing of natural rubber , Processing of natural rubber , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The role of hydroxyl ion concentration in the endwise depolymerization of hydrocellulose has been investigated in sodium hydroxide solution (0.05–18.6N) at 120°C, by determining the amount of degradation and the changes of carboxyl content and degree of polymerization in the solid phase. The extent of degradation incr…
Raman spectra for Ln 2 O 2 S: Eu (Ln=Lu, Y, Gd and La) have been measured at room temperature. The observed four Raman lines are divided into low and high-frequency groups, each consisting of A 1g and E g modes in representations of D 3d crystal point group. The high-frequency lines shift toward low frequency with inc…
An experimental investigation on the aqueous polymerization of acrylamide with potassium persulfate initiator is reported. Molecular weight averages were measured by viscometry. Non-Newtonian effects were accounted for by extrapolation to high shear rates where the polymer solutions approximated Newtonian behavior. Va…
Maximum stable lengths of the floating-liquids zone (lmax) were measured in the small-diameter (d=0.25–1.5 mm) float-zone crystal growth of sapphire and silicon. A 100-W cw CO2 laser was used as power source. The measured ratios of lmax/d for sapphire and silicon are in good agreement with the theoretical analyses by…