Materials Literature
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A series of linear rod−coil multiblock oligomers of the (rod−coil) n type ( n = 1, 2, 3, 13) consisting of a rigid rod segment made up of three biphenyls connected though methylene ether linkages and a poly(propylene oxide) with degree of polymerization of 13 as a coil segment were prepared, and their thermal behavior…
Nanostructured vanadium-hydrides, ${\ensuremath{\beta}}_{2}\ensuremath{-}{\mathrm{VH}}_{x},$ with typical grain sizes of 80 nm $(x=0.82),$ 30 nm $(x=0.73),$ and 10 nm $(x=0.67)$ were prepared by mechanical milling under hydrogen atmosphere. The final grain size, about 10 nm, does not change any more with increasing mi…
Single-bubble sonoluminescence (SBSL) from noble gases in water is studied theoretically in order to clarify the reason of the distinguished feature that the luminescence is strong for all noble gases, while the other systems of cavitation luminescence are greatly enhanced by the presence of the heavy noble gas(xenon)…
The flagelliform silk protein underlies the unique elastomeric properties displayed by the capture spiral of arachnid webs. To investigate molecular mechanism underlying the elastomeric recovery of the capture spiral, a model polypeptide based upon the elastomeric repeat sequence of Nephila clavipes flagelliform silk…
First-principles total-energy calculations on the tetragonal states of bulk elemental copper have been made with a full-potential electronic structure program with both the local-density approximation (LDA) and the generalized gradient approximation (GGA). The unique path through tetragonal states produced by epitaxia…
[structure: see text]. The epoxidation of (E)-beta-methylstyrene mediated by an oxochromium salen complex yields the epoxide in 92% ee in stoichiometric mode, the highest ee yet reported for a metal-mediated epoxidation of an (E)-alkene. The effect of added donor ligands, previously substantial, has reached a ceiling…
Abstract Scales are minerals that form on a surface due to the saturation of the local environment with an inorganic salt. The major categories of scales are: carbonates (Ca, Mg, Fe(II)), sulfates (Ca, Ba, Sr, Ra), oxides and hydroxides (Fe(II), Fe(III), Mg), sulfides (Fe(II) and Zn) and silicates (Ca, Mg, Al and Na).…
In this work, the aggregation of microgel particles has been investigated, paying special attention to the structure of the clusters formed in the process. In particular, the aggregates' fractal dimension was determined by static light scattering. The results indicate that the aggregates are more compact than expected…
Reaction mechanisms between titanium, tantalum, and niobium ethoxides and deuterated water in the atomic layer deposition (ALD) of TiO 2, Ta 2 O 5, and Nb 2 O 5 were studied with a mass spectrometer. The amounts of the reaction product CH 3 CH 2 OD + ( m / z = 47) and its main fragment CH 2 OD + ( m / z = 32) increase…
The valence states of the nucleogenic (57)Fe arising from the nuclear disintegration of radioactive (57)Co by electron capture decay, (57)Co(EC)(57)Fe, have been studied by Mössbauer emission spectroscopy (MES) in the (57)Co-labeled systems: [(57)Co/Co(terpy)(2)]Cl(2).5H(2)O (1), [(57)Co/Co(terpy)(2)](ClO(4))(2).(1)/(…
We present a detailed comparison between experimental adsorption measurements and the excess adsorption predicted by the Ono−Kondo lattice model. The study was performed for high-pressure adsorption of hydrogen above the critical point on microporous adsorbents. The experimental adsorption isotherms of hydrogen on the…
We discuss the stress relaxation in a uniaxially strained solid due to the coarsening of a system of parallel cracks. We emphasize similarities and differences of this process to Ostwald ripening in a first order phase transition. A conventional mean-field approximation breaks down and several independent length scale…
The microscopic dynamics of the fragile glass-forming liquid ${\mathrm{Ca}}_{0.4}{\mathrm{K}}_{0.6}{(\mathrm{N}\mathrm{O}}_{3}{)}_{1.4}$ is investigated by molecular dynamics simulation with a polarizable model. Polarization effects are included within a fluctuating partial charges approach for the nitrate ion. Single…
The dynamics of Ostwald ripening in elastically stressed crystalline solids is determined through large-scale numerical simulations. Using the insight provided by the simulations, a theory for the dynamics of late-stage phase separation in elastically anisotropic homogeneous solids is developed. Both the theory and si…
Low-energy properties of half-filled Fibonacci Hubbard models are studied by weak-coupling renormalization group and density matrix renormalization group methods. In the case of diagonal modulation, weak Coulomb repulsion is irrelevant and the system behaves as a free Fibonacci chain, while for strong Coulomb repulsio…
A promising room-temperature copper etching process is described. The copper thin film can be etched into a vertical profile at a high rate using a parallel-plate reactor under mild conditions. The key factor for the success of this process is a copper swelling phenomenon from the plasma–copper reaction. The reaction…
Using original modulation technique, the longitudinal electron spin-relaxation time ${T}_{1}$ has been measured directly in the paramagnetic state of three ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ samples $(x=0.2,$ 0.25, and 0.33). Well above the phase-transition temperature ${T}_{c},$ the…
Optically activated indium oxide diffractive optical microstructures are demonstrated through a two step laser based fabrication method. Nonstoichiometric indium oxide thin film material grown by reactive pulsed laser deposition has been selectively transferred onto glass substrates by ultrashort pulse laser microprin…
The orientational order parameter decrease, due to nematic director macroscopic fluctuations, is obtained by birefringence measurements around the nematic <--> smectic-A transition temperature of the liquid crystal 4'-n-octyl-4-cyanobiphenyl. The measured nematic order reduction shows the same amplitude as the seconda…
Molecular beam epitaxial methods have been used to grow single crystal Laves phase DyFe2/YFe2 superlattice samples with a (110) growth direction. Detailed magnetization curves have been obtained for YFe2 dominated multilayer samples [wDyFe2/4wYFe2]×16 with w=45, 50, and 55 Å. In particular, it is shown that the format…