Materials Literature
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Electrochemical impedance (AC impedance) measurements are practical for predicting corrosion behavior. Combining this technique with small amplitude DC polarization offers a rapid method of estimating corrosion rates. Optimization of the potentiostat gain allows for the rapid estimation of very low corrosion rates. Fu…
The first eleven members of the homologous series of α-(4-cyanobiphenyl-4'-oxy)-ω-(4-n-alkylanilinebenzylidene-4'-oxy)hexanes have been synthesized. The compounds are all enantiotropic nematogens and, with the exception of the heptyl, octyl and nonyl homologues, exhibit smectic phases. The thermal stability of the sme…
The idea either to reveal or to construct a liquid ferroelectric was never abandoned by researchers since the discovery of ferroelectricity in solid crystals at the beginning of this century. In principle, nature does not forbid the existence of ferroelectric liquids. For instance, a centro-symmetric liquid can change…
Abstract Although thermodynamic calculations indicate a narrow range of conditions for coprecipitation of kaolinite and K-feldspar, coexistence of authigenic kaolinite and K-feldspar is common in Jurassic sandstones of the North Sea. This paper shows that the coexistence of authigenic K-feldspar and kaolinite may indi…
Abstract— Synthetic methods to obtain selectively sulfonated metallo phthalocyanines are compared. Both condensation and direct sulfonation procedures lead to mixtures of mono‐ to tetrasulfonated products which are resolved by reverse phase liquid chromatography in buffered aqueous‐methanol. The proportion of sulfonat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModerately strong intramolecular magnetic exchange interaction between the copper(II) ions separated by 11.25 .ANG. in [L2Cu2(OH2)2(.eta.-terephthalato)](ClO4)2 (L = 1,4,7-trimethyl-1,4,7-triazacyclononane)Phalguni. Chaudhuri, Karen. Oder, Karl. Wieghardt, Stefan. Gehring, W…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of polybutadiene ringsJacques RooversCite this: Macromolecules 1988, 21, 5, 1517–1521Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/ma00183a049https://doi.…
Large multilamellar non-ionic surfactant vesicles (niosomes) with diameters of around 800-900 nm prepared from a C16 triglyceryl ether with and without cholesterol and containing doxorubicin (Adriamycin) were administered to S180 tumour-bearing NMRI mice by bolus injection. Although in-vitro drug release from choleste…
Four ferrimagnetic chains formed by manganese hexafluoroacetylacetonate and different nitronyl nitroxide radicals 2-R- 4,4,5,5-tetramethy1-4,5-dihydro1-H -imidazolyl-1 - oxy 3-oxide (with R = isopropyl, ethyl, methyl, and phenyl) were synthesized. The magnetic susceptibility measurements in the range 6300 K show a div…
Abstract An automated tension infiltrometer useful for a range of water tensions from 0.02 to 0.50 m and for infiltration rates of 1 × 10 −8 to 5 × 10 −4 m s 1 is described. Infiltration rates are calculated from the change in water height in a Mariotte column. Water height is automatically measured by using the diffe…
The scattering matrix, differential cross section, and total cross section for supramicrometer-size nematic droplets in a polymeric matrix are derived in the anomalous-diffraction approach. Scattering patterns are calculated in detail for three different nematic-director configurations: one characteristic of a droplet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation state of cerium in cerium-based catalysts investigated by spectroscopic probesFrancois Le Normand, Lionel Hilaire, Koffi Kili, Gerard Krill, and Gilbert MaireCite this: J. Phys. Chem. 1988, 92, 9, 2561–2568Publication Date (Print):May 1, 1988Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScattering theory and properties of block copolymers with various architectures in the homogeneous bulk stateH. Benoit and G. HadziioannouCite this: Macromolecules 1988, 21, 5, 1449–1464Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Publish…
Dense ‘‘diamondlike’’ hydrocarbon films (a-C:H) are a class of amorphous solids which can be condensed as thin films from nonequilibrium environments by several plasma deposition techniques. Films with hydrogen atom fractions from 0.5 to 0.6 select a structure with an average coordination number close to the theoretic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(alkyl/arylphosphazenes) and their precursorsRobert H. Neilson and Patty Wisian-NeilsonCite this: Chem. Rev. 1988, 88, 3, 541–562Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021…
A single-crystal Lorentz correction is derived for the case of a general scan through an out-of-plane reflection on a four-circle diffractometer with relaxed sample-to-detector collimation. When the Lorentz correction is expressed in terms of the incremental steps in the Eulerian setting angles, structure amplitudes o…
α-titanium single crystals, containing three different amounts of interstitial impurities, have been tested in compression at temperatures between 77 and 700 K. The mechanical behaviour is characterized by a strong temperature dependence of the yield stress for slip on the primary prismatic slip plane (1010)[1210], a…
In the directional solidification of concentrated alloys, the frozen solid region is separated from the melt region by a mushy zone consisting of dendrites immersed in the melt. Simultaneous occurrence of temperature and solute gradients through the melt and mushy zones may be conducive to the occurrence of salt-finge…
An explicit form of the spin-adapted multireference coupled-cluster formalism in the linear approximation is developed for the special case of a two-dimensional model space involving only closed-shell-type configurations. The formalism is applicable to a number of quasidegenerate systems with two valence orbitals of d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose-poly(vinyl alcohol) blends prepared from solutions in N,N-dimethylacetamide-lithium chloride.Yoshiyuki Nishio and R. S. John ManleyCite this: Macromolecules 1988, 21, 5, 1270–1277Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Publ…