Materials Literature
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Abstract Broadband dielectric spectroscopy was used to study the segmental (α) and secondary (β) relaxations in hydrogen‐bonded poly(4‐vinylphenol)/poly(methyl methacrylate) (PVPh/PMMA) blends with PVPh concentrations of 20–80% and at temperatures from −30 to approximately glass‐transition temperature ( T g ) + 80 °C.…
Abstract The melting temperature and heat of fusion were measured for an extensive series of compositionally uniform copolymers of ethylene with butene‐1, hexene‐1, and octene‐1. Fractions and whole polymers that exhibited minimal interchain compositional heterogeneity were from commercial copolymers made with either…
An on-line X-ray diffraction system capable of monitoring and identifying the polymorphic form of organic materials crystallized during batch crystallization processes is described. The overall system comprises a conventional X-ray source, monochromator, collimator, slits, curved position sensitive detector, and a flo…
A dimensionless correlation for the liquid overflow rate from a rising column of foam has been developed that expresses the ratio of liquid to gas superficial velocities as a function of Reynolds, Grashof, and Morton numbers. This correlation is developed using new and previously reported data. An empirical approach i…
We present the first demonstration of red shifting upon nonplanarity in alkylporphyrins using two pure conformations having known structures with identical substituents. The traditional view about the relationship of spectral red shifting to nonplanar deformation in porphyrins has been that the deformation from planar…
Microrelief structures were optically inscribed on binary polymer blend films which consist of a liquid crystalline azobenzene polymer as a host matrix and π-conjugated poly(3-dodecylthiophene) as a guest functional polymer. In this process, full migrations occurred to a level where the bare substrate surface was expo…
Semiconductor alpha-MoTe2 nanorods have been synthesized by annealing Te-seeded particles of an amorphous MoTe2 intermediate. This intermediate is prepared by a solution reaction between Mo(CO)6 and elemental Te in diphenylmethane. The as-synthesized products were characterized by structural, compositional, and morpho…
The purpose of this paper is to examine the effect of reaction parameters on the preparation of SiAlON powder. The conditions to obtain maximum concentration of nitrogen in the product were also examined and discussed. SiAlON (silicon aluminum oxynitride) powders have been prepared from Huntley fly ash in a tubular la…
Abstract The alternating copolymerization of propylene oxide and carbon monoxide was investigated with cobalt complexes. The NaCo(CO) 4 /amine catalyst system selectively yielded oligo(3‐hydroxybutyrate)s bearing a polymerizable crotonate end group, whereas the use of Co 2 (CO) 8 as a cobalt source resulted in a small…
Abstract We have synthesized bis( N ‐hexylethylenediamine)silver( I ) nitrate ([Ag(hex‐en) 2 ]NO 3 ), bis( N ‐octylethylenediamine)silver( I ) nitrate ([Ag(oct‐en) 2 ]NO 3 ), and bis( N ‐dodecylethylenediamine)silver( I ) nitrate ([Ag(dod‐en) 2 ]NO 3 ) and investigated the aggregation behavior of [Ag(dod‐en) 2 ]NO 3 a…
A perturbation method is modified to calculate the thermal conductivity of ionic crystals by molecular dynamics simulation. The energy flux and perturbation tensor are formulated so as to contain only phase space variables and a single convergence parameter. The characteristics of the perturbation method are studied u…
In this work, the adsorption and temperature induced-decomposition of maleic anhydride (MA, C 4 H 2 O 3 ) on the polar Zn−ZnO(0001) and O−ZnO(0001̄) surfaces and on the nonpolar ZnO(101̄0) surface of zinc oxide were investigated using X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure…
Prospective gadolinium(III) MRI contrast agent precursors [Gd-TREN-1,2-HOPO] (1) [TREN-1,2-HOPO = tris[(1-hydroxy-2-oxo-1,2-dihydropyridine-6-carboxamido)ethyl]amine] and [Gd-TREN-bis(Me-3,2-HOPO)-1,2-HOPO] (2) have been synthesized and characterized by relaxometric measurements. The water proton relaxivity values of…
The resonant Raman intensity of the radial breathing mode is calculated for 50 narrow semiconducting single-walled carbon nanotubes within a symmetry-adapted nonorthogonal tight-binding model. The matrix elements of the momentum and the deformation potential in the quantum-mechanical formula for the intensity are calc…
There has been an increasing effort in designing pharmaceutical particles with controllable properties (quality) such as chemical purity, morphology, size distribution, surface characteristics, and microstrain content. In this paper, we explore the feasibility of oscillatory flow mixing (OFM) in improving the quality…
Compatible solutes such as glycine betaine and proline betaine serve as protein stabilizers because of their preferential exclusion from protein surfaces. To use extracellular sources of this class of compounds as osmo-, cryo-, or thermoprotectants, Bacteria and Archaea have developed high affinity uptake systems of t…
A comparative analysis of the structure and mechanical properties of two elastomeric amorphous and semicrystalline polypropylenes samples, produced with C 2 v -symmetric and chiral C 2 -symmetric ansa -zirconocene catalysts, respectively, is presented. The poorly isotactic polypropylene ( iam -PP) of medium molecular…
Structure analysis of multifunctional nanoparticles could be a complex process. In this paper, we demonstrate the step-by-step techniques used for identifying the structure of the CoFe−Fe 3 O 4 nanoparticles, which are composed of ∼4-nm CoFe cores and covered with ∼3-nm Fe 3 O 4 polynanocrystallites. The techniques de…
Fruits of the laboratory: Dendrimers containing up to six different functional groups can be prepared in multistep one-pot reactions by using a selective manipulation and deprotection strategy (see example). The authors call these multifunctional dendrimers molecular fruit-salad trees; they could function as useful bu…
The spreading of Newtonian fluids on smooth solid substrates is well understood; the speed of the contact line is given by a competition between capillary driving forces and viscous dissipation, yielding Tanner's law $R \propto t^{1/10}$ . Here we study the spreading of non-Newtonian liquids, focusing on the two most…