Materials Literature
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ZnS nanobelts with a pure wurtzite phase have been synthesized by a thermal evaporation method with the assistance of H2S in an Ar atmosphere. Photoluminescence band centered at about 535nm has been observed under excitation in the range of 250–480nm with decay rate as short as 860ps. The origin of this intense photol…
We study (inverse) photoemission from systems with strong coupling of doped carriers to phonons. Using an adiabatic approximation, we develop a method for calculating spectra. This method is particularly simple for systems where the electron-phonon coupling can be neglected in the initial state, e.g., the undoped t-J…
Transport properties of a series of poly(3-hexylthiophene) organic field effect transistors with Cr, Cu and Au source/drain electrodes were examined over a broad temperature range. The current-voltage characteristics of the injecting contacts are extracted from the dependence of conductance on channel length. With rea…
The amorphous-to-crystal transition has been studied through in situ resistance measurements in Ge2Sb2Te5 thin films doped by ion implantation with nitrogen or oxygen. The dependence of the electrical resistivity and structure on the annealing temperature and time has been investigated in samples with different dopant…
p -type ZnO thin films have been realized by the N–Al co-doping method. Secondary ion mass spectroscopy demonstrated that the N incorporation was enhanced evidently by the presence of Al in ZnO. The lowest room-temperature resistivity was found to be 57.3Ωcm with a Hall mobility of 0.43cm2∕Vs and carrier concentration…
Bone morphogenetic protein (BMP)-2 has a critical role in bone formation and regeneration. Therefore, the ability to immobilize this molecule in certain matrices may be crucial in bone tissue engineering. Using carbodiimide chemistry, BMP-2 was directly immobilized on silk fibroin films. Whereas human bone marrow stro…
Glassy carbon is a technologically important material widely used in products such as electrodes and high-temperature crucibles. However, the properties which make glassy carbon so valuable in these applications are poorly understood, since its detailed atomic structure is not known. A model for the structure of glass…
Super-hydrophobicity can be achieved on relatively smooth surfaces. Short, wide pillars on slightly rough surfaces are shown to produce super-hydrophobic surfaces (see Figure) where neither the pillars nor the slight roughness suffice alone. This use of two length scales to create super-hydrophobic surfaces directly m…
New data are presented on neutron diffraction in ultrapure bulk supercooled heavy water measured down to 262 K. The data are analysed in terms of the trends observed in the first sharp diffraction peak (FSDP) parameters, the feature which dominates the measured neutron spectra. The neutron FSDP position, height and wi…
This paper discusses the differences between the results of various measurements of the effective tensile strength (F c ) of liquids in experiments involving a pulse of tension (‘negative pressure’) created by the reflection of a pressure pulse at a boundary. Using a modified ‘bullet-piston’ (B-P) pulse reflection app…
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…