Materials Literature
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The Frank elastic constants of lyotropic polymer liquid crystals are formulated using an equivalent freely-jointed chain model, which can be uniquely defined by the parameters of the corresponding wormlike chain and the polymer concentration. The contribution of the higher virial terms to the elastic constants was tak…
Different reconstructions of the polar, cation-terminated (100) surface of Cu 2 O have been investigated. All surfaces have been fully relaxed employing a pair-potential and shell-model description of the interactions within the crystal. A (1 × 1) missing-row reconstruction gave the lowest surface energy, while the ex…
The phase separation processes occurring in poly( l -lactide) (PLLA)−chloroform−methanol mixtures and poly( dl -lactide) (PDLLA)−chloroform−methanol mixtures have been studied using differential scanning calorimetry, cloud point measurements, and optical microscopy. It is demonstrated that liquid−liquid demixing occur…
Two very different molecular shapes are formed using the ligand 1,3,5-tris(diphenylphosphino)benzene (L); polymeric chains form through Au⋯Au contacts in the crystals of [(ClAu)3L], while the metallocyclophane [(PtCl2)3L2] self assembles from five components when L and [PtCl2(cod)] are combined in a 2:3 molecular rati…
A mathematical model was developed to simulate the emulsion copolymerization of acrylonitrile/butadiene, otherwise known as nitrile rubber. Our goal was to develop a practical tool to predict polymer production rate and product quality on an industrial scale. Model predictions include the polymerization rate, the poly…
ADVERTISEMENT RETURN TO ISSUEPREVNoteDifferentiating Unilamellar, Multilamellar, and Oligovesicular Vesicles Using a Fluorescent DyeF. M. Menger, S. J. Lee, and J. S. KeiperView Author Information Department of Chemistry, Emory University, Atlanta, Georgia 30322 Cite this: Langmuir 1996, 12, 18, 4479–4480Publication D…
Collagens are a family of structural proteins of the extracellular matrix. The fibril-forming collagens are the major structural proteins of skin, cartilage, bone, blood vessel walls and internal organs. In addition to biological function, the collagens provide natural structural frameworks that are utilized in the me…
The sol−gel method is applied to prepare γ-alumina-supported copper oxide and calcium oxide sorbents containing 10−50 wt % active species. The prepared sorbents are characterized for their pore texture, dispersion of active species on the surface of support, and desulfurization properties. The sol−gel-derived alumina-…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTChain Tilt in α-Poly(vinylidene fluoride)A. J. Lovinger and H. D. KeithView Author Information Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269Cite this: Macromolecules 199…
Dimacrocycle 6, incorporating three tetrathiafulvalene units, reacts with dication 7.2PF6 and dibromide 8 under ultra-high pressure (8 × 105 kPa), to exclusively give cis-[3]pseudocatenane 9.4PF6 in 20% yield.
The crystal growth kinetics of paracetamol have been investigated at different temperatures and the crystals obtained have been analysed for their mechanical properties. Variations in the crystal habit and crystal quality can be explained by different growth activation energies for the most important crystallographic…
Very well-preserved Pliocene diatoms from a diatomite unit interbedded within glacial sediments at Ocean Drilling Program Site 742 in Prydz Bay, Antarctica are documented and illustrated. The presence of Thalassiosira kolbei, T torokina, Actinocyclus actinochilus, A karstenii and the absence of Nitzschia interfrigidar…
Solid-state nuclear magnetic resonance (NMR) was used to characterize porous silicon (PS) surfaces. On freshly prepared samples, the range of hydrogen content measured by 1 H NMR was equivalent to 0.5−3 monolayers, while fluorine concentrations were below the 19 F NMR detection limit. The 1 H nuclei were used to selec…
The CVD of Cu using (hfac)Cu(VTMS) (hfac = hexafluoroacetylacetonate, VTMS = vinyltrimethylsilane) and (hfac)Cu(2-butyne) in the presence of water and other reagents has been studied. The overall CVD reaction involving disproportionation of these copper(I) compounds in the presence of water is similar to the overall r…
Cyclic voltammetry experiments show that the corrosion behavior of binary nickel‐iron alloys shows a gradual change from iron‐like behavior to nickel‐like behavior. The behavior of the 50 and 75% iron alloy is similar to the behavior of pure iron, the behavior of the 10% iron alloy is similar to the behavior of pure n…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPhysisorption of Nitrogen by Mesoporous Modified KanemiteP. J. Branton, K. Kaneko, N. Setoyama, K. S. W. Sing, , and Y. FukusimaView Author Information Department of Chemistry, Faculty of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263, Japan School of Chemistry, Bristo…
Linear very high molecular weight polyamides, such as nylons 6, 7 and 66, have been prepared via the rapid ring-opening polymerization (ROP) of their respective lactams catalyzed by super nonionic poly(aminophosphazene) and protophosphatrane bases. The super nonionic poly(aminophosphazene) bases appear to mimic cataly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorThermotropic and Lyotropic Mesophase Behavior of Some Novel Phthalocyanine-Centered Poly(oxyethylene)sGuy J. Clarkson, Bashir M. Hassan, Darren R. Maloney, and Neil B. McKeownView Author Information Department of Chemistry, University o…
A new mixed valence copper complex Cu(II)(Me(5)dien)Cl(2)(Cu(I)Cl) (2) was obtained from the reaction of CuCl with Cu(II)(Me(5)dien)Cl(2) (1) in acetonitrile. The structures of 1 and 2 have been determined by single-crystal X-ray diffraction analyses. Compound 1 crystallizes in the monoclinic space group P2(1)/n with…
This study examines the structure of planar polyelectrolyte brushes and the disjoining pressure between such brushes in a poor solvent. The self-consistent field theory is used in this work in contrast with the earlier studies that used a step-density model. We predict that upon the reduction in solvent quality the br…