Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of Composition Fluctuations in Diblock Copolymer Solutions Far from and Near to the Ordering TransitionT. Jian, S. H. Anastasiadis, A. N. Semenov, G. Fytas, K. Adachi, and T. KotakaCite this: Macromolecules 1994, 27, 17, 4762–4773Publication Date (Print):August 1, 1…
The morphology and primary crystal structure of SLPF, a protein polymer produced by genetically engineered Escherichia coli bacteria, were characterized. SLPF is a segmented copolymer consisting of amino acid sequence blocks modeled on the crystalline segments of silk fibroin and the cell attachment domain of human fi…
The dynamics of phase separation in two-dimensional binary mixtures diluted by surfactants is studied by means of molecular dynamics simulations. In contrast to pure binary systems, characterized by an algebraic time dependence of the average domain size, we find that systems containing surfactants exhibit nonalgebrai…
Abstract Enantioselective epoxidation of unfunctionalized olefins is achieved by the combined use of molecular oxygen and pivalaldehyde in the presence of a catalytic amount of optically active Mn(III)–salen complexes. N-Alkylimidazoles are effective axial ligands to produce optically active epoxides with high enantio…
Lipid particle size and distribution were found to significantly affect the water vapor permeability (WVP) properties of whey protein/beeswax edible emulsion films. Films oriented with the lipid-enriched side facing the high relative humidity environment during WVP testing exhibited lower WVPs. Particle size distribut…
and were investigated as potential low voltage cathodoluminescence phosphors for use in vacuum fluorescent displays. A low‐voltage cathodoluminescence spectrophotometer was developed for phosphor characterization. Brightness was measured as a function of anode voltage (10 to 300 V). The effects of activator concentrat…
Aqueous solutions of zirconium acetate and aluminum nitrate were spray pyrolyzed at 250°C and upquenched to different temperatures to yield metastable solid solutions of composition Zr (1− x ) Al x O (2− x /2) . An amorphous oxide forms first during pyrolysis which subsequently crystallizes as a single phase for x ≤ 0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization Kinetics and Morphology of Poly(3-hydroxybutyrate)/Cellulose Ester BlendsMaria Pizzoli, Mariastella Scandola, and Giuseppina CeccorulliCite this: Macromolecules 1994, 27, 17, 4755–4761Publication Date (Print):August 1, 1994Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerspectives on Solid-State Host-Guest AssembliesV. Ramamurthy and D. F. EatonCite this: Chem. Mater. 1994, 6, 8, 1128–1136Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://doi.org/10.1021/cm00044a011R…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of Organic Anions Promoted by a Quaternary Ammonium Ion DendrimerJeng-Jong Lee, Warren T. Ford, J. A. Moore, and Yufei LiCite this: Macromolecules 1994, 27, 16, 4632–4634Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published…
The crystal structure of the complex between ribonuclease A and d(ApTpApApG) has been solved by xray crystallography using the molecular replacement method. The model includes, besides the enzyme, the d(ApTpApA) 5'-segment (A'T2ASA4) and 68 solvent molecules. The R-factor for the strongest 87p of the measured data tha…
We propose a new model for the brittle-to-ductile transition based on the Kosterlitz-Thouless concept of dislocation screening. In this model, thermal fluctuations assisted by the applied stress drive the spontaneous generation of dislocations and the instability occurs well below the melting temperature. In the limit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheological and Microstructural Transitions in Colloidal CrystalsL. B. Chen, M. K. Chow, B. J. Ackerson, and C. F. ZukoskiCite this: Langmuir 1994, 10, 8, 2817–2829Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August…
For the burning of plutonium derived from nuclear warheads, once-through type oxide fuels have been studied by considering their proliferation resistance and environmental safety as well as their technological backgrounds of fuel fabrication and reactors.From phase relations of ceramic materials and their chemical pro…
We present a continuum theory of frustration-limited clusters in one-component glass-forming liquids that accounts, in part, for the recently reported [Fischer et al., J. Non-Cryst. Solids, 131–133, 134 (1991)], and quite unexpected, presence in simple glass-forming liquids of stable clusters at low temperatures (T) a…
It is shown that strongly reducing the range of the attractions of a simple fluid will transform its phase diagram from the usual type, with a fluid-fluid critical point and a fluid-fluid-solid triple point, into its fluid-solid mirror image, with a solid-solid critical point and a solid-solid-fluid triple point. This…
A general purpose multiline, mean‐normalized‐intensity (MNI) method, derived from a procedure proposed in the literature, was applied to puase‐composition analysis of powders containing α‐ and β‐silicon nitride and small amounts of free silicon. Results obtained using peak and integrated intensities to derive the MNI…
Abstract A high-pressure modification of tungsten dioxide (hp-WO 2 ) was synthesized at 80 kbar and 1120 K. The structure was determined from X-ray powder diffraction data: hp-WO2, M = 215.85, space group Pnma, a = 9.7164(3) Å, b = 8.4380(3) Å, c = 4.7564(2) Å, Z = 12, D x = 11.03 g cm −3 , R wp = 0.12 and R B = 0.078…
The synthesis and characterization of a highly processable thermosetting polyimide system based on 22'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride or bisphenol A dianhydride (BPA-DA) endcapped with 4-phenylethynylphthalic anhydride is described. The system afforded oligomers that were readily melt processab…
X-ray crystallography has allowed to identify new solid solutions with the formulae LiPb1–xMxPO4, NaBa1–yM′yPO4 and NaPb1–zSrzPO4. When M = Sr, Ba, × varies between 0.0 and 0.4 in the vicinity of LiPbPO4 and between 0.8 and 1.0 close to LiMPO4 while for M″=Sr, 0.2 ≤y≤0.8 and M″=Pb, 0.0 ≤y≤ 1.0. The third system corres…