Materials Literature
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Image-processing techniques for measuring the fibre-orientation distribution in a nonwoven fabric are described. The digitised image of the surface of a fabric is progressively simplified by a line operator and edge-smoothing and thinning operations to produce an image in which fibres are represented by curves of one…
NO selective reduction by CH4 over Ga2O3 catalysts is a structure-sensitive reaction depending on the local structure of Ga2O3; low-coordinate Ga ions are responsible for higher activity.
Configuration interaction (CI) spaces obtained from the full CI space by imposing arbitrary restrictions on the occupancies of molecular orbital (MO) groups are studied. It is proved that such restricted spaces are in a certain sense “closed.” Namely, in the course of the Hamiltonian matrix construction the excitation…
Reaction of Fe(OH) 3 with 2 equiv of catechol (Cat) and 1 equiv of NaOH in aqueous solution produces violet crystals (monoclinic unit cell, space group C 2/ c, with a = 22.544(9) Å, b = 12.949(6) Å, c = 22.459(9) Å, β = 91.10(3)°, V = 6555(5) Å 3, Z = 4, and R = 0.039) of (Ph 4 P) 2 [Fe 2 (Cat) 4 (H 2 O) 2 ]·6H 2 O. X…
The application of the desyl or 2-oxo-1,2-diphenylethyl moiety as a photolabile ligand for the release of phosphates such as cAMP and inorganic phosphate (P i ) 1,2 is extended to include selected excitatory amino acids. The synthesis and photochemical studies of N - and O -desyl-caged versions of the endogenous amino…
Isotactic (i) and syndiotactic (s) polypropylenes (PP) have been successfully incorporated into the channels of their inclusion compounds (IC) with urea (U). The IC's were obtained by cocrystallization following the addition of a warm toluene solution of polymer to a warm solution of urea in methanol. The white crysta…
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…