Materials Literature
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The complex admittance was measured for CsH2PO4 in the frequency range from 30 Hz to 60 MHz and in the temperature range 90-550 K. The domain wall relaxation time was found to decrease anomalously when approaching to Tc. From the investigations of the conductivity of CDP the structural phase transition at Tsi.=503K wa…
Abstract In the present paper, progress has been made in developing a model for nonisothermal vulcanization of rubber compounds. The model is presently based on differential scanning calorimetry (DSC) measurements of heat evolved during vulcanization. The model parameters are determined from several isothermal DSC sca…
We present a simple way to compensate for hysteresis and creep in piezoelectric actuators. By inserting a capacitor in series with the piezoelectric actuator, we find a reduction in the size of the hysteresis loop. For a suitable small capacity in series, creep is eliminated.
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…