Materials Literature
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Propene-hexene copolymers crystallize in a new polymorphic form of isotactic polypropylene when the concentration of hexene is higher than nearly 10-15 mol %. The hexene units are included in the crystals, inducing an increase of density that allows crystallization of 3-fold helical chains in a trigonal unit cell acco…
We report on the use of simple chemical vapor deposition (CVD) nanocasting routes to simultaneously control the morphology, pore size, and graphitization in structurally well-ordered mesoporous carbons. Mesoporous silica SBA-15 rods were used as hard templates to nanocast mesostructured carbon nanorods and nanotubules…
The corrosion properties of bulk nanocrystalline ingot iron (BNII) fabricated from conventional polycrystalline ingot iron (CPII) by severe rolling were investigated by means of immersion test, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) tests, and scanning electron microscopy (SEM…
The suitability of amino acids and dipeptides as structure-directing agents for the deposition of coatings from aqueous solutions of zinc salts is discussed. According to a bio-inspired approach, the influence of these biomolecules was investigated with respect to the evolution of architectures based on zinc oxide and…
A liquid crystal (LC) lens with focal length variable from negative to positive is reported. There are three electrodes in the LC cell. One electrode has a circular hole in the center. The lens is driven by two voltages that produce a spatially nonuniform and symmetrical electric field in the LC layer. By adjusting th…
The energy relaxation of the electrons in the conduction band of 12 and 30 nm diameter copper nanoparticles in colloidal solution was investigated using femtosecond time-resolved transient spectroscopy. Experimental results show that the hot electron energy relaxation is faster in 12 nm copper nanoparticles (0.37 ps)…
We report the effect of aggregation in gold nanoparticles on their ultrafast electron-phonon relaxation dynamics measured by femtosecond transient absorption pump-probe spectroscopy. UV-visible extinction and transient absorption of the solution-stable aggregates of gold nanoparticles show a broad absorption in the 55…
We apply systematic methods previously used by Mihalkovic et al. to predict the structure of the `basic' Co-rich modification of the decagonal Al70 Co20 Ni10 layered quasicrystal, based on known lattice constants and previously calculated pair potentials. The modelling is based on Penrose tile decoration and uses Mont…
Personal comments are made about the title subjects, including: the relation of Friedel oscillations to Hume-Rothery stabilisation; how calculations may resolve the random-tiling versus ideal pictures of quasicrystals; and the role of entropies apart from tile-configurational.
Using spin-1/2 description of valence holes and Kondo coupling between local spins and carriers, GaAs-based III-V diluted magnetic semiconductors (DMS)are studied in the coherent potential approximation(CPA). Our calculated relation of ground-state energy and impurity magnetization shows that ferromagnetism is always…
Mechanistic investigations on the end-to-end assembly of Au nanorods to nanochains, in the presence of alpha,omega-alkanedithiols, were reported. A decrease in the longitudinal plasmon absorption was observed along with a concomitant formation of a new red-shifted band above a critical concentration of dithiol, which…
Polymorph discrimination of CaCO 3 mineral has been easily realized in an ethanol/water mixed solution system under mild conditions without using any organic additives. The phase transition from a mixture of calcite and aragonite to pure aragonite, and then to almost pure vaterite, can be nicely captured by the choice…
New oxides, BiAlO 3 and BiGaO 3, were prepared using a high-pressure high-temperature technique at 6 GPa and 1273−1473 K. BiAlO 3 is isotypic with multiferroic perovskite-like BiFeO 3 and has octahedrally coordinated Al 3+ ions. Structure parameters of BiAlO 3 were refined from laboratory X-ray powder diffraction data…
This article describes the studies of a photomagnetic cyanide-bridged Cu-Mo bimetallic assembly, Cu(II)(2)[Mo(IV)(CN)(8)].8H(2)O (Cu(II), S = (1)/(2); Mo(IV), S = 0) (1), which has an intervalence transfer (IT) band from Mo(IV)-CN-Cu(II) to Mo(V)-CN-Cu(I) around 480 nm. Wide-angle X-ray scattering and X-ray spectrosco…
Hydrogen-bonded multilayer thin films were constructed using poly(vinylpyrrolidone) and poly(methacrylic acid) functionalized with cysteamine. The resulting films included thiol moieties that were cross-linked to render the films stable at physiological pH. Film buildup was followed using quartz crystal microgravimetr…
Phase transformation of TiO2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers, visible Raman spectroscopy excited by 532 nm laser, X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV Raman spectroscopy is found to be more sensitive to the surface region of…
A combination of transmission electron microscopy (TEM) and in situ tensile testing in an environmental scanning electron microscopy (ESEM) was used to evaluate the static bulk and dynamic surface morphologies of medical polyurethanes. TEM results showed phase-separated hard segment and soft segment structures. Surfac…
Kapitel 46, 18 S.
We present a generalization of the Green-Kubo expressions for thermal transport coefficients $\ensuremath{\mu}$ in complex fluids of the generic form $\ensuremath{\mu}={\ensuremath{\mu}}_{\ensuremath{\infty}}+{\ensuremath{\int}}_{0}^{\ensuremath{\infty}}dt{V}^{\ensuremath{-}1}{⟨{J}_{ϵ}\phantom{\rule{0.2em}{0ex}}\mathr…
A phenomenological model based on the interactions between the crystal field and the 3d–4f exchange interactions has been developed to explain the zero-kelvin magnetic anisotropy of the RFe 11 Ti compounds and their hydrides, RFe 11 TiH, where R is a rare-earth element. In most cases, this model also predicts the exis…