Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollapse-stretching transition for polymer brushes: preferential solvationP. Auroy and L. AuvrayCite this: Macromolecules 1992, 25, 16, 4134–4141Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.a…
AesrRAcr The apparent SiO bond lengths recorded for silicates over a range oftemperatures either typically are invariant or exhibit a contraction with increasing temperature. A rigid-body thermal analysis was completed for the tetrahedra in nine silicates whose structures have been determined over a range of temperatu…
Poly(4-methyl-l-pentene) (PMP) is a linear α-polyolefin with isobutylbranches and with very interesting properties. From a practical point of view. PMP presents high optical transparency. relatively high thermal stability and chemical resistance. in addition to excellent dielectric characteristics and microwave transp…
Effects of salinity on the mineral composition, growth and physiology of field-grown sultana grapevines were studied by adding NaCl solution to River Murray water. Five salt treatments, ranging between 0.37 and 3.47 dS m-l, were applied for six seasons. Petiole levels of Cl and Na were better predictors of yield than…
The relationship between fibre strength loss and cellulose degree of polymerization (D.P.) was examined for different pulps and chemical treatments in an effort to understand the cause of fibre strength loss a high -cellulose contents. Is was found that the decrease in fibre strength is caused by the degradation of ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacial amphiphilesYuan Cheng, Douglas M. Ho, Craig R. Gottlieb, Daniel Kahne, and Michael A. BruckCite this: J. Am. Chem. Soc. 1992, 114, 18, 7319–7320Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://…
Brucite-related double layer structures are characterized by a regular but distinct stacking of [Me2x+Me3+ (OH)2x+2]+ octahedral layers with ordered cation distribution and usually x = 2 or x = 3, alternating with anionic {A·nH2O}- interlayers. The stacking sequence of the layers is rhombohedral (3R) or hexagonal (2H)…
The effect of different growth conditions on the glycogen and poly-β-hydroxybutyrate (PHB) content of the cyanobacterium Spirulina maxima is described. Under photoautotrophic growth conditions without any nutrient limitation, S. maxima exhibited a glycogen content of between 7.1 and 10.7% of cell dry wt, whereas PHB w…
Polycrystalline monoclinic ( m ), tetragonal ( t ), and cubic ( c ) ZrO 2 , sintered at 1500°C, were annealed in the cubic stability field and rapidly cooled to permit the displacive c → t ′ transformation to occur in compositions containing 0–6 mol% Y 2 O 3 . The bulk fracture toughness of coarse‐grained (> 25 μm)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCombined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 1. Mechanism of sulfur dioxide oxidation-adsorptionGabriele Centi, Nello Passarini, Siglinda Perathoner, and Alfredo RivaCite this: Ind. Eng. Chem. Res. 1992, 31, 8, 1947–1955Publication Date (Print):Aug…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArrested solid-solid phase transition in 4-nm-diameter cadmium sulfide nanocrystalsM. Haase and A. P. AlivisatosCite this: J. Phys. Chem. 1992, 96, 16, 6756–6762Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 19…
We isolated several overlapping cDNA clones covering the 4242 nucleotides of a Strongylocentrotus purpuratus transcript that codes for a fibrillar procollagen chain. The sea urchin polypeptide includes a 124-amino acid long amino pre-propeptide, a 1064-amino acid alpha-chain inclusive of 338 uninterrupted Gly-X-Y repe…
Abstract This article describes the synthesis and characterization of a new series of liquid crystalline thermosets. Nematic epoxy‐terminated oligoethers based on dihydroxy‐α‐methylstilbene were synthesized for this study. These prepolymers were crosslinked within the nematic mesophase using methylenedianiline. Depend…
OBJECTIVES: Gadolinium-ethoxybenzyl-DTPA (Gd-EOB-DTPA) is a new hepatobiliary magnetic resonance imaging (MRI) contrast agent with a dual elimination: 70% via the liver and bile and 30% via the kidney in normal rats. The abdominal enhancement patterns of this new compound and the uptake mechanism by the liver were stu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfidation of zinc titanate and zinc oxide solidsSusan Lew, Adel F. Sarofim, and Maria Flytzani-StephanopoulosCite this: Ind. Eng. Chem. Res. 1992, 31, 8, 1890–1899Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 Augus…
The lattice constants of boron carbides have been determined by powder X‐ray diffraction for samples with compositions between about 7.7 and 20.5 at.% carbon. The boundaries of the single‐phase region are at about 9 at.% carbon and near, but likely somewhat less than, 20 at.% carbon. The composition dependence of the…
High‐sinterability MgAl 2 O 4 powder has been produced from alkoxide precursors via a freeze‐drying method. Clear alumina sol and magnesium methoxide were used as starting materials in the process. The spinel powders were characterized by various techniques, such as thermal analysis, X‐ray diffraction, scanning electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative structure-property relationships for aqueous solubilities and Henry's law constants of polychlorinated biphenylsFrank M. Dunnivant, Alan W. Elzerman, Peter C. Jurs, and Mohamed N. HasanCite this: Environ. Sci. Technol. 1992, 26, 8, 1567–1573Publication Date (Pri…
^2H NMR relaxation measurements were used in an extensive study of chain mobility in poly-(amido amine) (PAMAM) dendrimers as a function of molecular weight and position along the chain. For ^2H labels in the terminal generation, the spin-lattice relaxation times (T_1) were found to decrease as the number of chain ter…
Two series of poly(amido amine) (PAMAM) dendrimers have been prepared. Both were built from an ammonia core via repetitive addition of methyl acrylate and ethylenediamine. End groups were either hydroxyl or amine, the former derived from 2-aminoethanol substituted for ethylenediamine in the final amidation step. The d…