Materials Literature
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Two triazole derivatives were synthesized, and their inhibiting ability for scaling and corrosion process was checked using various electrochemical techniques. Potentiodynamic polarization studies clearly reveal the fact that triazole derivatives are good mixed-type inhibitors. Electrochemical impedance spectroscopy m…
The adsorption of CO on Al 2 O 3, ZrO 2, ZrO 2 −SiO 2, and ZrO 2 −La 2 O 3 supported Pd catalysts was studied by adsorption microcalorimetry and infrared (IR) spectroscopy. Some interesting and new correlations between the results of microcalorimetry and IR spectroscopy have been found. The CO is adsorbed on palladium…
Pentaheptites (three-coordinate tilings of the plane by pentagons and heptagons only) are classified under the chemically motivated restriction that all pentagons occur in isolated pairs and all heptagons have three heptagonal neighbors. They span a continuum between the two lattices exemplified by the boron nets in T…
Core−shell type micelles with a hydrodynamic diameter of 52 nm composed of 38 molecules of zinc dendrimer porphyrin with 32 carboxylate groups on the periphery and 39 poly(ethylene glycol)−poly( l -lysine) (PEG−PLys) block copolymers were prepared at a stoichiometric mixing ratio. These micelles showed an unusually hi…
In this work, the displacement of a globular protein from the air/water interface by sodium dodecyl sulfate (SDS) was followed using a combination of the Langmuir−Blodgett method and atomic force microscopy. The results are compared to displacement of the same protein by the nonionic surfactant Tween 20. The displacem…
The dispersion process of laponite clay powder in water was investigated using light scattering. The complete dispersion process takes about 12 h. Laponite solutions were characterized in salt-free water and in 10 - 3 M NaCl using static and dynamic light scattering, which shows that laponite has a large size polydisp…
Synthetic strategies for preparing dimeric tetrathiafulvalenes (TTFs) linked by either one, two, or four bridges have been developed. In particular, we report efficient few-step protocols for the preparation of face-to-face overlapped quadruple-bridged bis-TTFs. The ready interconversion of cis and trans TTFs in the p…
The isostructural compounds of general formula Cu 2 Te 2 O 5 X 2 (X = Cl, Br) have been synthesized by chemical transport reaction. They crystallize in the tetragonal system, space group P 4̄ with a = 7.6209(3) Å, c = 6.3200(4) Å, and a = 7.8355(2) Å, c = 6.3785(2) Å for Cu 2 Te 2 O 5 Cl 2 and Cu 2 Te 2 O 5 Br 2 respe…
A series of 35 layered compounds A[M II Cr III (C 2 O 4 ) 3 ]· n solvent has been synthesized with five different metals (M = Mn, Fe, Co, Ni, Cu) and seven hyperpolarizable stilbazolium-shaped A chromophores: (4-[4-(dimethylamino)-α-styryl]- N-alkyl pyridinium), alkyl = methyl, ethyl, isopropyl (DAMS, DAES, DAPS respe…
We report on results from high-energy spectroscopic measurements on CeFe2, a system of particular interest due to its anomalous ferromagnetism with an unusually low Curie temperature and small magnetization compared to the other rare earth-iron Laves phase compounds. Our experimental results indicate very strong hybri…
We present exact results for the density profile of the one dimensional array of N hard spheres of diameter D and mass m under gravity g. For a strictly one dimensional system, the liquid-solid transition occurs at zero temperature, because the close-pakced density, $ϕ_c$, is one. However, if we relax this condition s…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNonflocculating and Chiral-Nematic Self-ordering of Cellulose Microcrystals Suspensions in Nonpolar SolventsL. Heux, G. Chauve, and C. BoniniView Author Information CERMAV-CNRS, Joseph Fourier University of Grenoble, Box. 53, 38041 Grenoble Cedex 9, France Cite this: Langmuir 2…
We studied the effect of pH on ligand binding in wild-type lactose permease or mutants in the four residues-Glu-269, Arg-302, His-322, and Glu-325-that are the key participants in H(+) translocation and coupling between sugar and H(+) translocation. Although wild-type permease or mutants in Glu-325 and Arg-302 exhibit…
13C-selective NMR, combined with inhibitor perturbation experiments, shows that the C(epsilon)(1)H proton of the catalytic histidine in resting alpha-lytic protease and subtilisin BPN' resonates, when protonated, at 9.22 ppm and 9.18 ppm, respectively, which is outside the normal range for such protons and approximate…
We have measured the heat conduction between 0.05 K and 1.0 K of high purity silicon wafers carrying on their polished faces a variety of thin dielectric films and polycrystalline thin metallic films. Using a Monte Carlo simulation to analyze the conduction measurements, we have determined the phonon mean free path wi…
This is the last part of a series of five articles published in Journal of Rheology (Maier et al. (1998), Thimm et al. (1999a), Thimm et al. (2000a), Thimm et al. (2000c)) in which progress on the determination of binary molecular weight distributions from rheological data has been reported. In this article is discuss…
We have developed a rigorous unidirectional method for designing finite-aperture diffractive optical elements (DOE's) that employs a micro-genetic algorithm (microGA) for global optimization in conjunction with a 2-D Finite-Difference Time-Domain (FDTD) method for rigorous electromagnetic computation. The theory and i…
A systematic study is reported on the thickness dependence of the electrical resistivity in thin films of the giant magnetoresistance manganite Nd2/3Sr1/3MnO3. We observed a first-order phase transition versus thickness in these films, which is seen as a jump of about 30 K in the metal-to-insulator transition temperat…
This work describes the effects of pyrolysis oven length and erbium precursor on the preparation of discrete erbium-doped silicon nanoparticles. These doped nanoparticles were prepared by the co-pyrolysis of disilane and the volatile complex Er(tmhd)3 (tmhd=2,2,6,6-tetramethyl-3,5-heptanedionato). The particle sizes a…
Promising configurations for grating-waveguide structures are presented. In these structures, the grating layer, which is normally adjacent to the waveguide layer, is displaced by means of an intermediate layer, resulting in significant reduction of losses and weaker coupling. This leads to very narrow spectral bandwi…