Materials Literature
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Wetting and brazing studies of sputtering‐deposited, submicrometer thin film filler metal in an Ag—Cu—Ti/Al 2 O 3 system were performed. The interfacial reaction layer between the filler metal and Al 2 O 3 was investigated. It is possible to make a brazing joint even with a reaction layer of less than 100 nm thickness…
Abstract Utilizing high-resolution transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) and X-raydiffraction (XRD) techniques, we have studied the transition from shallower smectite-rich mudrocks to deeper illite-rich mudrocks in Pliocene-age turbidite sediments from the northern Gulf of Mexico…
Thin layers of grafted polymer chains were produced by ultraviolet light-induced graft polymerization of a hydrophilic monomer, methacryloxyethyl phosphate, onto the Ar plasma-pretreated film surface of high-density polyethylene. The hydrogen-bonding interactions in the grafted polymer and the wettability of the graft…
‐based perovskites are of interest as cathode material for the development of advanced solid oxide fuel cells operating at temperatures significantly lower than 900°C. The compatibility of the selected materials is necessary to guarantee long‐term operation of a solid oxide fuel cell. Systematic investigations on the…
Starting from α-tetralone and maleic anhydride, novel AB-type amino anhydrides 3 and 5 were synthesized in good yields and obtained in high purity without self-condensation. The tetrahydro[5]helicene monomer 3 could be readily polymerized in m -cresol to give polyimide 8 with high molecular weight. Although direct pol…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHost−Guest Complex Dependent Regioselectivity in Substitution Reactions of Chlorocyclotriphosphazene-Containing PNP-Crowns with AlkylenediaminesKrystyna Brandt, Iwona Porwolik, Mariola Siwy, Teobald Kupka, Robert A. Shaw, David B. Davies, Michael B. Hursthouse, and Geo…
The diffusion profile of small helium bubbles along grain boundaries in in-situ aluminium has been examined by electron microscopy observation. It was found that bubbles moved two-dimensionally in the general grainboundary interface with a misorientation about the axis [122]. The occurrence 2 * ) ( P R t probability,…
This paper presents a generalization of the unidimensional deformation equation based on the van Wyk theory. The derivation considers the effect of uncompressed areas between contacting fibers. Theoretical results are verified by the experimental work of Baljasov. The solution is extended to cover bidimensional deform…
Adsorption behavior of the hydrocarbons n -hexane, n -octane, cyclohexane, neopentane, and benzene on microporous activated carbon fibers (ACFs) was studied by use of molecular adsorption and adsorption calorimetry. The calorimetric aspects were discussed in connection with pore characteristics determined by nitrogen…
The thermoelastic behavior and equilibrium stress–strain properties of chitosan films lightly crosslinked with gluteraldehyde and swollen with water were studied. Precautions were taken to preclude changes in the swelling ratio of swollen sample films during the experiment. The results indicate that at relatively low…
The shear response of a Nicalon‐reinforced ceramic‐matrix composite was investigated using Iosipescu tests. Damage was characterized by X‐ray, optical, and SEM techniques. The large inelastic strains which were observed were attributed to rigid body sliding of longitudinal blocks of material. These blocks are created…
Using an off-lattice Monte Carlo bead-spring model of a chain in a random environment, we study chain conformations and dynamic scaling of diffusivity and relaxation times with chain length N and density of the host matrix ${\mathrm{C}}_{\mathrm{obs}}$. Our simulational results show that with growing ${\mathrm{C}}_{\m…
Ab initio geometry optimizations and normal mode analysis have been performed on a series of oligomers of leucoemeraldine base (LB, the fully reduced amine form of polyaniline) over conformational variations with the HF/6-31G* basis set. Aniline was used to obtain 12 force constant scaling factors with the best vibrat…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInclusion Adduct Formation between Tris(o-phenylenedioxy)cyclotriphosphazene and Poly(ethylene oxide) or PolyethyleneA. Paul Primrose, Masood Parvez, and Harry R. AllcockView Author Information Department of Chemistry, The Pennsylva…
Abstract Polymerisation conditions have a remarkable effect on the electrochemical properties of polyaniline. Care has to be taken to ensure identical conditions for electrochemical experiments when films electropolymerised differently are examined in comparison, especially when films are prepared potentiodynamically.…
A careful study of the existing literature available in the field of cavitation reveals the potential of ultrasonics as a tool for controlling and, if possible, eliminating certain types of hydrodynamic cavitation through the manipulation of nuclei size present in a flow. A glass venturi is taken to be an ideal device…
A laboratory study was conducted on the cavitation corrosion behavior of a commercial cast duplex stainless steel (DSS) in seawater using an ultrasonically-induced cavitation facility. Mass loss, free-corrosion potential, potentiodynamic polarization, and microscopic examinations were compared in the absence and prese…
A facile preparation of polyimide–silica gel hybrids by the simultaneous in-situ formation of polyimides during the hydrolysis–condensation of tetramethoxysilane (TMOS) is reported here. The hydrolysis and condensation of TMOS was carried out in a solution of DMAc containing 5% LiCl, CaCl2 or ZnCl2 and the seven-membe…
The noncollinear magnetic structure of ferrimagnetic ${\mathrm{Mn}}_{4}$N is calculated ab initio. The magnetic exchange contributions of the different magnetic sites are estimated and compared with ordinary fcc-Mn. For this purpose we present a model which allows us to explain the noncollinear spin configurations of…
The syntheses and mesomorphism of novel octaalkoxymethyl-substituted tetra-2,3-thiophenophorphyrazines, heterocyclic phthalocyanine analogues in which the benzene rings are replaced by thiophene rings, are reported. NMR analysis indicates that these materials exist as isomeric mixtures due to the asymmetry induced by…