Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and photoactivity of chemically asymmetric polymeric porphyrin films made by interfacial polymerizationCarl C. Wamser, Raymond R. Bard, Velu Senthilathipan, Valerie C. Anderson, James A. Yates, Harold K. Lonsdale, George W. Rayfield, Dwayne T. Friesen, Douglas A. L…
Abstract Poly[ N , N ′‐(sulfo‐phenylene)phthalamid]es and poly[ N , N ′‐(sulfo‐ p ‐phenylene)pyromellitimide] were prepared in water‐soluble form and were found to have unique solution properties, similar in some respects to xanthan. The polymer most investigated, poly[ N , N ′‐(sulfo‐ p ‐phenylene)terephthalamide] (P…
We study the transition between the twisted and untwisted states of a cholesteric liquid crystal bounded between two plates and constrained to have homeotropic anchoring at the plate surfaces. Previous theories predict that the twisted-untwisted transition should be second order, while experiments show that it is firs…
In this work the value methods of deposit caused by reversible movement of domain and interphase boundaries (boundaries between the tetragonal and rhombohedral phases) into piezomoduli is proposed. Ceramics on the basis of (Ba, Ca)TiO3 (TBK) and Pb(Zr, Ti)O3 (ZTS) were estimated. In some materials piezoeffect is cause…
The genus of a three-periodic intersection-free surface in R3 refers to a primitive unit cell of its symmetry group. Two procedures for the calculation of the genus are described: (1) by means of labyrinth graphs; (2) via the Euler characteristic derived from a tiling on the surface. In both cases new formulae based o…
Abstract Comparative analyses of the 4f N (Ln 3+ ) energy level structures in a series of LiYF 4 :Ln 3+ systems are reported. These analyses focus on empirical energy level data currently available in the literature for the Pr 3+ , Nd 3+ , Eu 3+ , Dy 3+ , Ho 3+ , Er 3+ , and Tm 3+ systems, and they are based on the us…
The pitting corrosion of two duplex stainless steels was studied in chloride solutions. Phase compositions were determined by micro-analytical techniques and correlated with pitting behavior. The study showed that the pitting potential and the preferential pitting of the ferrite or austenite phase was dependent upon p…
Novel modeling and sensitivity analysis techniques are used with experimental data obtained from discharge flow–resonance fluorescence experiments to evaluate the product branching ratio of OH+H2CO. Two channels are considered: the H-atom abstraction reaction (R2) to form HCO and H2O; and the addition reaction (R17) f…
Upon the cw optical excitation of N-V centers in diamond, a spin alignment in the ensemble of nonexcited N-V defects in the electron spin-triplet ground state is induced. When the diamond sample is subjected to magnetic fields of suitable directions and strengths, cross relaxation (CR) and level anticrossing are found…
A method for the determination of rotational viscosity and elasticity associated with the director rotation on the C * cone is proposed. The method is based on measurements of the Goldstone mode dielectric strength and relaxation frequency, supplemented with values for spontaneous polarization, tilt angle and pitch. F…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroad-band dielectric spectroscopy on a set of combined main-chain side-group liquid-crystalline polymersF. Kremer, S. U. Vallerien, R. Zentel, and H. KapitzaCite this: Macromolecules 1989, 22, 10, 4040–4045Publication Date (Print):October 1, 1989Publication History Publishe…
Galvannealed steel is an iron-zinc alloy coated steel produced by a diffusion process. The corrosion potentials and corrosion current of the various iron-zinc alloy phases present in the coating were measured in a neutral salt solution by employing coulometric and linear polarization techniques. In laboratory accelera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopy and structural characterization of five-coordinate, bis(aryldiazenido)technetium complexes and their protonation reactions. X-ray structure of [TcCl(PPh3)2(NNC6H4Br)2]Terrence Nicholson, Nadine De Vries, Alan Davison, and Alun G. JonesCite this: Inorg…
The GTP binding domain of the c-Ha-ras protooncogene product (p21'c) and the corresponding region from an oncogenic mutant form of the protein in which glycine at position 12 has been replaced by valine [p21'(G12V)] have been crystallized with P3-1-(2-nitro)phenylethylguanosine 5'-O-triphosphate (caged GTP) at their a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of bilayer membranes in organic solvents by novel amphiphilic compoundsYuichi Ishikawa, Hiroaki Kuwahara, and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1989, 111, 22, 8530–8531Publication Date (Print):October 1, 1989Publication History Published online1 May 2…
Abstract XPS and contact angle measurement have been used to study oxygen–plasma‐treated polypropylene (PP) surfaces aged at variable temperatures. Surface rearrangement leading to low wettabillity has been observed, without alteration of the surface composition, as determined by XPS. Experimental results have been in…
Abstract The lattice parameters of a series of hydrogenated polybutadiene (HPB) model copolymers is measured as a function of branch content between 0 and 73 ethyl branches per 1000 C atoms. Expansion of the a and b axes nearly ceases for branch contents greater than 20 per 1000 C atoms. The c axis is seen to contract…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBound water in collagen: evidence from Fourier transform infrared and Fourier transform infrared photoacoustic spectroscopic studyV. Renugopalakrishnan, G. Chandrakasan, S. Moore, T. B. Hutson, C. V. Berney, and Rajendra S. BhatnagarCite this: Macromolecules 1989, 22, 10, 41…
Electrical properties of BaTiO 3 ‐based capacitors are investigated. A new model is developed to explain the frequency response of the impedance of grain‐boundary barrier layer (GBBL) capacitors. This model takes into consideration the dipole polarization effect and provides a simple and effective approach to evaluate…