Materials Literature
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Abstract Poly(o-aminobenzoic acid) and copolymers of o-aminobenzoic acid and aniline were synthesized as excellent candidates for the precursor of polyaniline. The reaction conditions were optimized with emphasis on the isolated yield. The polymers were characterized by a number of techniques including infrared spectr…
The production of cold shock proteins (csps) and cold acclimation proteins (caps) was characterized in the psychrotrophic bacterium Pseudomonas putida Q5 and its transconjugant P. putida Q5T which contains the toluene-degradative TOL (pWWO) plasmid, using two-dimensional gel electrophoresis and computing scanning lase…
RATIONALE AND OBJECTIVES: A series of studies was conducted to determine whether metal complexes of the EOB-DTPA type are useful as contrast agents for computed tomography (CT). METHODS: Metal complexes using EOB-DTPA as ligand were synthesized with lanthanide metal ions (lanthanum [La], cerium [Ce], praseodyme [Pr],…
The magnetic hyperfine splitting frequencies of (i) $^{57}\mathrm{Ni}$ in Fe ${(}^{57}$NiFe), (ii) $^{57}\mathrm{Ni}$ in Ni ${(}^{57}$NiNi), and (iii) $^{59}\mathrm{Fe}$ in Fe ${(}^{59}$FeFe) were measured with the technique of nuclear magnetic resonance on oriented nuclei (NMR-ON) at low temperatures. The NMR-ON spec…
The three-dimensional structure of the complexes of ribonuclease A with cytidyl-2',5'-adenosine (2',5'-CpA) and deoxycytidyl-3',5'-deoxyadenosine [3',5'-d(CpA)] in aqueous solution has been determined by 1H NMR methods in combination with restrained molecular dynamics calculations. Twenty-three intermolecular NOE cros…
Rare‐earth (R) melilite M(R) and its solid solution M'(R) are investigated. Starting with compositions of R 2 Si 3 O 3 N 4 and R 2 Si 2 AlO 4 N 3 , the formation conditions for M(R), M'(R), and their neighboring phases have been delineated, and their lattice parameters and stoichiometry have been determined. Systemati…
The role of second-order perturbations in interlayer interactions of two-dimensional electronic systems is examined. The general features of interlayer interactions are deduced from a simple two-layer model. The preferred motion is discussed specifically for the stacking of layers in graphite, using a transition-densi…
Abstract Phenol-based dinucleating macrocycles possessing two dissimilar N(amine)2O2 and N(imine)2O2 metal-binding sites, sharing two phenolic oxygens, have been obtained as mononuclear Cu(II) complexes, capable of incorporating a second metal ion to provide homo- and hetero-dinuclear complexes.
In a previous experiment, it was shown that a gas identification sensor using porous silicon necessitated more than 60% concentration for identification. In the present study, it was shown by means of an experiment using water vapor that the concentration limit for gas identification may be controlled by changing the…
Abstract Aqueous suspensions of allophane show relatively high viscosity, presumably because of strong particle interaction between the unit particles. To test this hypothesis, we measured the particle weight and particle size of allophane during a dispersion using the light scattering method. The particle weight was…
The rheological properties of self-assembling fluids are studied within the framework of a simple time-dependent Landau-Ginzburg model. In addition to the Langevin relaxation dynamics, the order parameter field is subject to a kinematic deformation process due to a shear velocity field. The Hamiltonian contains a Gaus…
Results are presented of studies on the low frequency (f' 250 kHz) non-linear dielectric effect on approaching the nematic and smectic A phases in 4′-cyano-4-n-alkylbiphenyls (nCB, for n = 6, 7, 8, 10, 11, 12). In all cases, the mean-field behaviour was valid up to the clearing temperature. In the case of the isotropi…
Crystal data: Na 4 Si 3 Al 3 O 12 Cl, cubic, space group P 43 n , Z = 2, F (000) = 233.06 fm, μ n = 0.06 cm −1 , lattice parameter a o (Å) [ T ] (K) at eight temperatures: 8.882 (1) [295]; 8.902 (2) [500]; 8.912 (1) [600]; 8.923 (1) [700] 8.951 (2) [800]; 8.971(1) [900]; 8.988 (1) [1000]; 9.037 (1) [1200]. The crystal…
Using the exact charge density of intrinsic point defects of metal oxides (MOs), the phenomenological electron theory of chemisorption, developed by Volkenstein, is applied to acceptorlike and donorlike chemisorption on MO thin films for the whole ξ region (where ξ=D/LD, D is the film thickness, and LD is Debye length…
The double-differential cross section for inner-shell ionization in a crystal by fast electrons is calculated within the theory of dynamical electron diffraction. Bloch waves are used for the incident and the emerging electrons. We show that interference terms are still present in the independent Bloch-wave model. In…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
The effective response of random media consisting of two different kinds of strongly nonlinear materials with strong power-law nonlinearity is studied. Each component satisfies current density and electric-field relation of the form J=\ensuremath{\chi}|E${\mathrm{|}}^{\mathrm{\ensuremath{\beta}}}$E. A simple self-cons…
The mathematical model of a flexible beam covered with shape memory alloy (SMA) layers is presented. The SMA layers are used as actuators, which are capable of changing their elastic modulus and recovery stress, thus changing the natural frequency of, and adjusting the excitation to, the vibrating beam. The frequency…
Cardo polysulfonates (PSBCB and PSBCT) of 1,1′-bis(4-hydroxy phenyl)cyclohexane with benzene-1,3 and toluene-2,4-disulfonyl chlorides have been synthesized by interfacial polycondensation of 1,1′-bis(4-hydroxy phenyl)cyclohexane (0.005 mol) with benzene-1,3/toluene-2,4-disulfonyl chlorides (0.005 mol) using water-chlo…