Materials Literature
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This paper presents an experimental study on the manufacture of low-density fine-cell high density polyethylene (HDPE) foams in extrusion using CO2 as a blowing agent. The strategies adopted to produce low-density, fine-cell HDPE foams were to generate a large number of cells by a rapid pressure drop, to suppress cell…
alloy was microencapsulated with cobalt by electroless deposition from an alkaline hypophosphite bath. Discharge curves of the encapsulated alloy indicate an additional contribution to the capacity arising from the cobalt on the surface. Studies on cobalt thin films reveal the presence of adsorbed hydrogen in cobalt.…
A series of seven poly(ethylene-co-1-octene) samples made with a single-site-type catalyst were analyzed by crystallization analysis fractionation (CRYSTAF). The samples have similar average copolymer compositions but differ in their average molecular weights. CRYSTAF results confirm the theoretical predictions of Sto…
Conducting polymers such as polypyrrole and polyaniline are being extensively studied for their use in a wide range of new products. These materials are unique in that they have switchable properties due to their 2 or more mechanically stable oxidation states. Thus, films or coatings can be easily switched by the appl…
Fumed silica is a synthetic amorphous silicon dioxide produced by burning silicon tetrachloride in an oxygen-hydrogen flame. Surface areas range from 50–400 m2/g. Using particle sizing techniques, fumed silica shows micron sized particles leading to surface areas markedly lower than expected. Fumed silica appears as a…
Preparation, optical properties, and electrochemical redox behavior of poly(benzimidazole-4,7-diyl)s are reported. Dehalogenation polycondensation of 4,7-dibromobenzimidazole and its derivatives (2-heptyl and 2-phenyl derivatives) with zerovalent nickel complexes gives the corresponding polymers in 72–100% yield. Poly…
A new GeS2-based chalcohalide glass was synthesized by the melt-quenching technique for nonlinear optical applications. A large glass-forming region was defined, and a wide infrared transmission was measured. Marked optical third-order nonlinearity was measured (n2≈7.5×10-5 cm2/GW), making this glass one of the best c…
Two-phonon spectra of ${}^{12}{\mathrm{C}}_{1\ensuremath{-}x}^{13}{\mathrm{C}}_{x}$ diamonds, $0<~x<~1,$ are measured with a sensitive charge-coupled device-based Raman and a Fourier transform infrared spectrometer. Exploiting the infrared activity and the polarization characteristics of the Raman spectra record…
The phase ordering kinetics of various liquid crystalline materials from well known series (PCH, CCH, nO. m, BCH and CB) when turning from a disordered to an ordered phase induced by a rapid temperature quench have been investigated. The process of phase ordering can generally be described by the growth of a character…
A flowing afterglow−tandem mass spectrometer has been used to determine 0 K bond strengths in three hypervalent polyhalide ions: D (Cl 2 −Cl - ) = 99 ± 5 kJ/mol, D (Br 2 −Br - ) = 127 ± 7 kJ/mol, and D (Br 2 −Br 3 - ) = 40 ± 7 kJ/mol. These bond strengths are close to the previously measured values D (I 2 −I - ) = 126…
Neutron scattering, ac susceptibility, and NMR measurements have been made on isotopically enriched ${}^{154}{\mathrm{SmMn}}_{2}{\mathrm{Ge}}_{2}.$ All the magnetic states are characterized from much clearer neutron-diffraction spectra than in previous works, in which natural abundance Sm was used. A temperature versu…
The adsorption and reaction of CO on Rh particles supported on oxidized and partially reduced epitaxial ceria films on yttria-stabilized cubic zirconia (YSZ) (100), (110), and (111) single crystals was studied using temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The ceria films on…
The effects of solution variations during growth on the perfection of tetragonal lysozyme crystals have been characterized using X-ray topography and high angular and wavevector resolution reciprocal-space scans. X-ray images of crystals grown under nearly uniform conditions show little contrast or evidence of defects…
The interactions of water with H−ZSM-5, Cu−ZSM-5, and Co−ZSM-5 have been investigated by density functional theory (DFT). Calculations were also performed to determine the thermodynamics of metal removal from the zeolite. For all three forms of ZSM-5, water adsorbs by direct interaction of the O atom with the cation a…
Biodegradable poly(lactic acid)-grafted amylose was synthesized using a trimethylsilyl (TMS) protection method. Tetrahydrofuran soluble, mostly trimethylsilyl protected amylose was prepared and reacted with potassium tert-butoxide to give the corresponding alkoxide. Poly(lactic acid)-grafted amyloses were obtained by…
It was shown that in the polymerization of 2-methyl-2-oxazoline initiated with benzyl bromide in nitrobenzene the equilibrium constant of the interconversion of cationic and covalent active centers could be measured over a wide range of temperatures, thus making the thermodynamic parameters of this reaction available.…
The expanded Hansen method was tested for determination of the solubility parameters of two non-steroidal anti-inflammatory drugs, naproxen and sodium diclofenac. This work describes for the first time the application of the method to the sodium salt of a drug. The original dependent variable of the expanded Hansen me…
Coprecipitates, Ni(OH)2 + 2Fe(OH3, were milled in a planetary mill, using an agate bowl and balls (99.9% SiO2), and then heated at a maximum temperature of 573 or 773 K. The Mossbauer spectra at 298 K of the ball-milled samples (not heated) showed the superposition of two quadrupole doublets. After heating at 573 K, t…
Using the Gibbs description of an interphase, the necessary conditions for equilibrium of a closed, two-phase fluid system in the presence of gravity are the Laplace and Young equations and a condition on the chemical potentials. The last condition has been neglected in all previous examinations of contact angles in a…
Supramolecular multilayered ferromagnets in which metal layers are interleaved with iminonitroxide benzoate radical anions have been synthesized and characterized by the authors. The structure of these novel compounds (see cover) consists of stacks of alternating organic–inorganic layers. Long-range ferromagnetism is…