INVITED REVIEW SECONDARY CONTACT NUCLEATION: KINETICS, GROWTH AND SCALE-UP
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Peculiarities of phase transitions in sodium-bismuth titanate
The ferroelectric properties of (Na0,5Bi0,5TiO3) single crystals are studied. It is found that some physical characteristics possess a large temperature hysteresis in the temperature range 200 – 300°C. The nature of that hysteresis is discussed.
Properties of Segmented Polyether Poly(urethaneureas) Based of 2,4-Toluene Diisocyanate. 2. Infrared and Mechanical Studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of Segmented Polyether Poly(urethaneureas) Based of 2,4-Toluene Diisocyanate. 2. Infrared and Mechanical StudiesC. S. Paik Sung, T. W. Smith, and N. H. SungCite this: Macromolecules 1980, 13, 1, 117–121Publication Date (Print):January 1, 1980Publication History Pu…
High oxygen ion conduction in sintered oxides of the Bi2O3-Er2O3 system
The phase diagram of the Bi2O3-Er2O3 system was investigated. A monophasic f c c structure was stabilized for samples containing 17.5–45.5 mol% Er2O3. Above and below this concentration range polyphasic regions appear. The f c c phase showed high oxygen ion conduction. The ionic transference number is equal to one for…
Crystal structure and electronic properties of ammine[tris(2-aminoethyl)amine]copper(II) diperchlorate and potassium penta-amminecopper(II) tris(hexafluorophosphate)
The crystal structure of the title compounds [Cu(tren)(NH3)][ClO4]2(1) and K[Cu(NH3)5][PF6]3(2) have been determined by X-ray diffraction methods using three-dimensional diffractometer data; the structures were solved by heavy-atom techniques and successive Fourier synthesis. Compound (1) crystallises in a cubic unit…
Effect of Water Content on the Gelatinization of Wheat Starch
Abstract The influence of water content on the gelatinization of wheat starch was examined by differential scanning calorimetry. Three endothermic transitions were observed when starch was heated to 140 °C with 35 to 80% (w/w) water. The temperature of the second and third endotherms and the enthalpies of the first an…
Exchange interaction in tetrameric oxygen-bridged copper(II) clusters of the cubane type
The magnetic properties of the tetrameric oxygen-bridged copper (II) complexes [{CuX(OCH2CH2NR2)}4](1)(R = Me, X = NCO; R =Prn, X = NCO; and R = Bun, X = NCO or NCS) have been determined in the temperature range 3.4–300 K. The cubane-type complexes exhibit magnetic interactions between the single copper (II) ions, whi…
A polymer electrode with variable conductivity: polypyrrole
Thin films of the ‘metallic’ polymer, polypyrrrole, when adhered to a platinum electrode surface, can be repeatedly driven between the conducting and insulating state with E°′ near –220 mV vs. the sodium chloride calomel electrode.
Band structure model and dynamical dielectric function in lowest stages of graphite acceptor compounds
A 2D band structure model is proposed to describe electronic states in the lowest stages (n = 1, 2) of GAC. The tight binding method is applied taking into account intra and interlayer nearest neighbour interactions. From the energies and wavefunctions of the π valence and conduction bands, the frequency dependence of…
Indirect location of hydride ligands in metal cluster complexes
A quantitative procedure for indirectly locating hydride ligands bound to transition metals in cluster compounds is described. The method predicts hydride positions which can be and are compared with those determined by neutron (and X-ray) diffraction. Examples are presented of its use in determining hydride sites in…
Chemical microstructure of polymer chains
Determination of Structure-Property Relationships in Polymers. Probability Applied to Polymerization. Theory of the Characterization of Polymer Microstructure. Multicomponent Copolymerization Theory. Copolymer Microstructure and Its Experimental Treatment. Chemical and Physical Methods of Determining Polymer Microstru…
Sorption and transport in glassy polymers–a review
Abstract After defining Fickian diffusion in rubbery polymers an overview of transport behavior in polymers is presented. Diffusion and sorption below the glass transition are discussed, followed by a review and classification of the various theoretical models which have been proposed to account for these phenomena. A…
The detection of DNA-binding proteins by protein blotting
A method, called "protein blotting," for the detection of DNA-binding proteins is described. Proteins are separated on an SDA-polyacrylamide gel. The gel is sandwiched between 2 nitrocellulose filters and the proteins allowed to diffuse out of the gel and onto the filters. The proteins are tightly bound to each filter…
Specimen damage considerations in biological microprobe analysis.
In many biological materials radiation damage limits the resolution of the microanalytical measurement. To provide some perspective regarding the relative merits of different experimental arrangements, the dose to the specimen may be calculated using a simple model. While electron and proton probe X-ray microanalysis…
3d transition-metal intercalates of the niobium and tantalum dichalcogenides. II. Transport properties
The Hall coefficient and resistivity of the first-row transition-metal intercalates, M1/3TaS2 (M = V, Cr, Mn, Fe, Co, Ni), Mnl/4TaS2, M1/3NbS2 (M = V, Cr) and Fel/4NbSe2 have been measured as a function of temperature. These intercalation complexes show either ferromagnetic or antiferromagnetic orderings and there are…
Stoichiometry, structure, and physical properties of niobium disulfide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry, structure, and physical properties of niobium disulfideWayne G. Fisher and M. J. SienkoCite this: Inorg. Chem. 1980, 19, 1, 39–43Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://pubs.…
Picosecond laser photophysics. Group 3A phthalocyanines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond laser photophysics. Group 3A phthalocyaninesJames H. Brannon and Douglas MagdeCite this: J. Am. Chem. Soc. 1980, 102, 1, 62–65Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://pubs.acs.org…
Short range correlation between elements of a long polymer in a good solvent
Correlation properties of a long polymer in a good solvent are studied with the help of renormalization techniques. The probability distribution of the vector r joining, in a space of dimension d, the end points of a polymer segment made of N links, is a function Ps,N(r), where s is an index referring to various situa…
Structural characteristics of pyrochlore formation
By calculating the value of the unknown oxygen positional parameter x for a large number of A3+2B4+2O7 pyrochlores, it was determined that increasing the radius of the A cation in a series of constant B increased the value of x, and that increasing the radius of the B cation in a series of constant A decreased the val…
Luminescence of porphyrins and metalloporphyrins. Part 1.—Zinc(II), nickel(II) and manganese(II) porphyrins
Metal-free and ZnTPP complexes exhibit both fluorescence and low temperature phosphorescence, MnIITPP shows only low temperature phosphorescence while NiIITPP is non-luminescent. The absorption spectra show that there is little interaction between the metal and the porphyrin π-system so that the excited states can be…