Materials Literature
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The concept of a neutron Hybrid Spectrometer (HYSPEC) combines the time-of-flight spectroscopy with the focusing Bragg optics and incorporates a polarized beam option. Here we describe the polarization analysis scheme proposed for HYSPEC and quantify its performance via the Monte-Carlo simulations. We find that the br…
Abstract Yttrium(III) acylalaninate complexes such as tris(N-hexanoyl-Dl-alaninato)yttrium(III) (=Y(hex-Dl-ala)3) and tris(N-octanoyl-Dl-alaninato)yttrium(III) (=Y(oct-Dl-ala)3) form stable glassy states by an evaporation of solvent from the methanol solution. The trend of formation of the stable glassy state is sensi…
Abstract Tb-doped YPO4 has been synthesized by a mild and simple solution precipitation approach. pH value of synthesis has a significant influence on the formation and crystallinity of YPO4:Tb. Phase transformation occurs in the annealing process. Vacuum ultraviolet (VUV) excitation of Tb-doped YPO4 is investigated a…
Temperature-programmed desorption (TPD) of CO has been performed on supported and unsupported nickel catalysts. The unsupported Ni catalyst consists of a Ni(14 13 13) single crystal which has been studied under ultrahigh vacuum conditions. The desorption energy for CO at low CO surface coverage was found to be 119 kJ/…
Poly(1,1‘-ferrocenyldimethylsilane)- b -poly(methyl methacrylate) (PFS- b -PMMA) diblock copolymers were blended with the corresponding homopolymers, PFS and PMMA. The obtained blends were investigated with respect to their microphase morphologies in the bulk. Special attention was paid to those compositions which are…
A dithienosilole (DTS) possessing methylthio (SMe) groups at the α,α‘-positions of the thiophene rings was prepared. The electronic states were tunable by oxidation of the sulfur atoms of DTS(SMe) 2 with the corresponding amount of m CPBA, giving DTS(SOMe) 2 or DTS(SO 2 Me) 2, and the UV absorption and fluorescence ma…
We study the nonlinear rheological behaviour and the microscopic particle dynamics for a colloidal glass. The measurements allow us to relate the microscopic diffusion dynamics to the macroscopic viscosity of the system. We demonstrate that the competition between the spontaneous restructuration (ageing) and the destr…
At variance with previous determinations, recent investigations on water suspension of a synthetic clay (Laponite) have shown the presence of an arrested phase also at very low clay concentrations (down to C w = 0.003). This surprising behaviour has been studied in a wide clay concentration range. As a result the exis…
CeB3O6 crystallizes in the monoclinic space group I2/a and is a member of the isostructural series REB3O6 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb). The structure consists of chains of [B6O12]n6− building units, that run parallel to the c axis, and tenfold coordinated Ce3+.
We have studied by dynamic light scattering the glass transition dynamics of a binary mixture of polystyrene microgel particles with a size ratio of R small / R large = 0.81 and a number ratio of , where a short-ranged depletion attraction ( ) was induced by addition of linear polystyrene. This system shows a reentran…
The rotation domain structures in ZnO films grown on sapphire substrates under different pre-treatment conditions have been investigated by in situ reflection high-energy electron diffraction and ex situ x-ray diffraction (XRD). It was found that by appropriate nitridation treatment, forming a thin AlN film on the sub…
Abstract This article firstly reports the successful synthesis of wollastonite single crystal nanowires by hydrothermal route. We obtained xonotlite nanowires on hydrothermal condition at a lower temperature (180 °C) using cationic surfactant as template. The nanowires have high aspect ratios more than 100 with diamet…
We synthesized ABC triblock rigid aromatic-flexible dendritic block molecules consisting of a docosyl chain, rigid aromatic segment, and poly(ethylene oxide) dendrimer. These block molecules were observed to exhibit an ordered structure in the solid state. Small-angle X-ray scattering experiments showed that the rigid…
Zinc oxide nanocrystalline films with (002) preferred orientation and intense ultravoilet (UV) emission were prepared by oxidation of zinc-implanted silica at 700°C for 2 h in oxygen ambient. A TEM micrograph showed that ZnO nanocrystalline films with a thickness of about 90 nm were formed on the surface of the Zn-imp…
The thermal resistance technique for measurement of the thermal conductivity of microporous thin membranes is described. A modified and enhanced Lees' disc apparatus was used. Several samples of membranes were held between a hot copper plate and a cold copper base, and the temperature differences between them were mea…
A mixture of monometallic Ag and Au dendrimer-encapsulated nanoparticles (DENs) has been separated by selective extraction, which relies on sequential orthogonal assembly of different ligands onto the surface of the two metals. The DENs extract as monolayer-protected clusters (MPCs) that have the same size and optical…
Abstract. We present some recent theory and simulation results addressing the phenomena of colloidal gelation at both high and low volume fractions, in the presence of short-range attractive interactions. We discuss the ability of mode-coupling theory and its adaptations to address situations with strong heterogeneity…
UDCaT-6, a novel active mesoporous and stable catalyst, was synthesized by generating in situ nanosized acidic centers of chlorosulfonic acid treated zirconia in the pores of highly ordered hexagonal mesoporous silica (HMS). For the first time, we have used chlorosulfonic acid as a source of sulfating agent to treat z…
We report theoretical and simulation studies of phase coexistence in model globular protein solutions, based on short-range, central, pair potential representations of the interaction among macro-particles. After reviewing our previous investigations of hard-core Yukawa and generalised Lennard-Jones potentials, we rep…
The combination of short-range attractions and long-range repulsions can lead to interesting clustering phenomena.In particular there are strong indications that the colloidal cluster phase is in fact a manifestation of such a competition.Here we compute the stability boundary of the cluster phase by invoking counter-…