Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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-…
The structure of the Baxter adhesive hard sphere fluid is examined using computer simulation. The radial distribution function (which exhibits unusual discontinuities due to the particle adhesion) and static structure factor are calculated with high accuracy over a range of conditions and compared with the predictions…
The construction of amperometric immunosensors to cholera antitoxin immunoglobulins were shown to have improved sensitivity when the cholera toxin B subunit biorecognition entity was linked to an electrogenerated biotinylated polypyrrole film copolymerized with pyrrole-lactobionamide monomer. The copolymer exhibits gr…
We review some results on the dynamics of gelation phenomena, obtained via a lattice model and via molecular dynamics using a DLVO potential. This study allowed us to make a connection between classical gelation and the phenomenology of colloidal systems, suggesting that gelation phenomena in attractive colloids at lo…
Thermal stability and dispersion of CeO 2 supported on Al 2 O 3 is greatly improved by insertion of ZrO 2 into the CeO 2 lattice. It is shown that homogeneous nanosized Ce x Zr 1 - x O 2 solid solutions can be prepared on the Al 2 O 3 surface by using a citrate complexation synthesis method. Investigation of effects o…
A simulation model for the solvent-mediated transformation from the metastable α-form to the stable β-form of l -glutamic acid ( l -Glu) was developed using the concept of the population balance. The solvent-mediated transformation process is a combination of the dissolution of the α-form and the nucleation and subseq…
We studied clustering and gelation in low-volume-fraction () hard-sphere colloids, some with charge, with added non-adsorbing polymers. The range of the effective 'depletion' attraction induced by the polymers between the particles is of the particles' diameter. The effects of density mismatch between the particles an…