Materials Literature
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The magnetic properties of single crystals of the chain compound formed by manganese(I1) hexafluoroacetylacetonate and the nitronyl nitroxide radical NIT-i-Pr (NIT-i-Pr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-l-o3x-yolx ide), Mn(hfa~)~NIT-i-Phra,v e been investigated at low temperature to character…
Abstract The effect of deformation history on the morphology and properties of liquid crystalline polymers (LCP) blended with polycarbonate resin was assessed. The addition of an immiscible LCP phase was found to improve the melt processability of the host thermoplastic polymer. In addition, by employing a suitable de…
The preparation and mesomorphic properties of a series of bis-(4-alkyl- or 4-alkoxy-benzoyloxy)-trans-1,4-dioxanes 1, trans-1,4-dithianes 2 and trans-1,4-cyclohexanes 3 are reported and compared to the corresponding hydroquinone bis-esters 4. The 1,4-dithianes 2 do not show liquid crystalline properties and the 1,4-di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and liquid-crystalline properties of (acetyl)(ethyl)celluloseJian Xin Guo and Derek G. GrayCite this: Macromolecules 1989, 22, 5, 2082–2086Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyphosphazene electrolytes for lithium batteriesGholamabbas Nazri, Donald M. MacArthur, and John F. OgaraCite this: Chem. Mater. 1989, 1, 3, 370–374Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.ac…
The highly reproducible pH-stat technique was used to study the influence of various types of inhibitors on the precipitation of calcium phosphate from solution. Three types of inhibitors were evaluated: (1) homo- and copolymers of acrylic acid, (2) polyphosphate and phosphonates, and (3) polycarboxylic acids. Experim…
Abstract A perturbation expression of the gyromagnetic factor of d 3 ions is derived considering the spinorbit coupling of the ligand ions and taking into account all the excited states besides 4 T 2 state. The molecular orbital coefficients are determined by means of a semiempirical method in estimating the g ‐shift.…
X-ray generated photoelectron and Auger transition data for several phosphorus reference compounds, including PCl3, P3 N5, P2 O5, (C6 H5 )3 P(C5 H4 ), (C6 H5 )4 PBr, KH2 PO4 , NH4H2PO4, and NH4 PF6 are presented. These data have been used to determine the relative ionicity and polarizability of phosphorus in the chlor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-hydrogen and carbon-hydrogen bond activation in ethylene glycol by atomic oxygen on silver(110): heterometallacycle formation and selective dehydrogenation to glyoxalArmand J. Capote and Robert J. MadixCite this: J. Am. Chem. Soc. 1989, 111, 10, 3570–3577Publication D…
Heat treatment of a bare single-domain lithium niobate plate at somewhat lower temperatures than the Curie temperature causes a local polarization reversal, thereby yielding a ferroelectric inversion layer. The plate with such an inversion layer can serve as a piezoelectric actuator similar to the bimorph, because the…
Abstract Novel heteroquinonoid compounds as potential electron acceptors, 2,5-bis(dicyanomethylene)-2,5-dihydrothieno[3,2-b]thiophene (4a), 3,6-dibromo derivative, 2,6-bis(dicyanomethylene)-2,6-dihydrodithieno[3,2-b:2′,3′-d]thiophene, 3,5-dibromo derivative, and 4,4-dioxide were synthesized by the action of tetracyano…
On the basis of a critical analysis of Li's disclination model of large-angle boundaries, the disclination-structural unit model is developed, combining both the atomistic and the mesoscopic levels of description of the grain-boundary structure. The curve of energy against misorientation angle for symmetrical [001] ti…
Expression of beta-galactosidase in transcriptional fusions with the pps gene (encoding phosphoenolpyruvate [PEP] synthase), the aceBAK operon (encoding malate synthase, isocitrate lyase, and isocitrate dehydrogenase kinase, respectively), and the phs operon (encoding either thiosulfate reductase or a regulatory prote…
Abstract The hydrolysis of model structures found in the hard blocks of polyurethanes has been studied under moderately acidic and neutral conditions. These include a series of N ‐alkyl and N ‐phenyl urethanes and ureas; for comparison purposes the corresponding amides and a carbonate ester based on bisphenol A were a…
Microtexture (i.e. grain-specific) measurements have been made from grains both before and after grain growth in an austenitic stainless steel. Such measurements allow computation of grain misorientation texture in terms of the proportions of coincident site lattice (CSL) boundaries. After 2% postrecrystallization str…
A combined experimental and numerical study is reported of melting of a pure metal inside a vertical rectangular enclosure with natural convection in the liquid and conduction in the solid. The numerical model is successfully verified by conducting a series of experiments covering a wide range of hot and cold wall tem…
The depth profile of passive layers on Fe/Cr alloys has been examined with ion scattering spectroscopy (ISS). The monolayer depth resolution of the method permits determination of a detailed Fe/Cr profile which may not be obtained with other methods. Cr is accumulated in the center of the passive film. In alkaline sol…
The relationships between target material properties and the target strength term in the analytic representation of impact is examined. For ductile materials hardness is closely related to the magnitude of the strength term. It is shown that the key parameters correlating microhardness measurements in ceramics are sim…
A variety of synthetic procedures are described that convert the trinuclear complex Mn<inf>3</inf>O(O<inf>2</inf>CPh)<inf>6</inf>(py)<inf>2</inf>(H<inf>2</inf>O) (1) into the hexanuclear complexes [Mn<inf>6</inf>O<inf>2</inf>(O<inf>2</inf>CPh)<inf>10</inf>(py)<inf>2</inf>(MeCN)<inf>2</inf>].2MeCN (2) and [Mn<inf>6</in…
Spatially periodic structures in nematic liquid crystals usually appear as the initial response to a suddenly applied reorienting field. To account for the significant discrepancy between the measured periodicity and the periodicity calculated from a linear instability analysis we derived nonlinear equations of motion…