Materials Literature
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The ground-state properties of a Co3II moiety encapsulated in a polyoxometalate anion were investigated by combining measurements of specific heat, magnetic susceptibility, and low-temperature magnetization with a detailed inelastic neutron scattering (INS) study on a fully deuterated polycrystalline sample of Na12[Co…
Pd-based composite membranes supported on porous stainless steel offer high permeability and good mechanical stability. They represent an appropriate alternative in catalytic membrane reactors. In this study, Pd−Ag/porous stainless steel membranes prepared by electroless plating were used in the oxygen-free methane ar…
To develop a nonmetal catalyst to decompose hydrocarbons, a new zeolite-like Ca 12 Al 10 Si 4 O 35 was prepared by calcining hydrogarnet, Ca 3 Al 2 (SiO 4 ) 0.8 (OH) 8.8, a hydrothermal reaction product from a mixture of CaO, Al 2 O 3 sol, and amorphous SiO 2 . The X-ray diffraction analysis showed the framework of (A…
Five novel heptanuclear trigonal-prismatic polyhedra, Na4[PrNi6(Gly)9(mu 3-OH)3(H2O)6].(ClO4)7 (1), Na2[PrNi6(Gly)8(mu 3-OH)3(mu 2-OH2)-(H2O)6].(ClO4)6.(H2O)2 (2), Na[DyNi6(Gly)7(mu 3-OH)3(mu 2-OH2)2(H2O)6].(ClO4)6.H2O (3), [SmNi6(Gly)6-(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O)9 (4), and [ErNi6(Gly)6(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O…
The local order in a supercooled monodisperse colloidal fluid is studied by direct imaging of the particles with a laser scanning confocal microscope. The local structure is analysed with a bond order parameter method, which allows one to discern simple structures that are relevant in this system. As expected for samp…
We have adapted the transition path sampling algorithm for the study of activated diffusive processes in complex systems, in which the system has to overcome a high and rough free energy barrier. The new scheme is based on the stochastic shooting procedure and employs molecular dynamics trajectories with an Andersen t…
Treatment of Pd4phen2(CO)2(OAc)4 with metal nitrates such as Cu(NO3)2 produced monodispersed Pd nanoclusters with a mean diameter and standard deviation (d ± σ) of 38 ± 2.1 Å (σ/d = 6%). The Pd nanoclusters act as heterogeneous catalysts for the selective oxidation of primary aromatic allylic alcohols using molecular…
Field emission properties of the (10,10) carbon nanotube are investigated with a first-principles approach. Emission currents are obtained through integrations of the time-dependent Schr\"odinger equation. We find that the emission current from the states localized at the tip end is more than ten times greater than di…
Liquid foam is an example of soft matter (or a complex fluid) with a very well-defined structure, first clearly described by Joseph Plateau in the 19th century. Current research addresses many aspects of the fluid dynamics of this system. How is liquid transported through it in response to a pressure gradient or gravi…
Towards small switches: The relationship between molecular orbitals and the conductance of a molecular wire, composed of a nanosized graphite sheet and two gold chains, is described. Useful rules for effective quantum transport are given, and a new model for a molecular switch is proposed. As indicated in the cartoon,…
Luminescent lanthanide complexes have been developed, based on the assembly of bulky ligands around the lanthanide ion, to provide shell-type protection of the ion from coordinated solvent molecules. Aryl-functionalised imidodiphosphinate ligands (tpip and Metpip) provide a bidentate anionic site that leads to hexa-co…
Recent research related to foam drainage is surveyed with emphasis on the influence of interfacial rheology. Active research directions are highlighted and the possible impact of these studies on macroscopic rheology is indicated.
In general, sensitization of lanthanide(III) ions by organic sensitizers is regarded to take place via the triplet state of the sensitizers. Herein, we show that in dansyl- and lissamine-functionalized Nd3+ complexes energy transfer occurs from the singlet state of the sensitizers to the Nd3+ center. No sensitized emi…
We use confocal microscopy to directly visualize the dynamics of ageing colloidal glasses. We prepare a colloidal suspension at high density, a simple model system that shares many properties with other glasses, and initiate experiments by stirring the sample. We follow the motion of several thousand colloidal particl…
The problem of the reduced dielectric response in thin films of high-permittivity materials is analyzed by studying the soft-mode response in several ${\mathrm{SrTiO}}_{3}$ thin films by means of Fourier transform far infrared, monochromatic submillimeter, and micro-Raman spectroscopies. A 300-nm-thick metalorganic ch…
Three novel ferrocenecarboxylato-bridged lanthanide dimers [Gd2(mu 2-OOCFc)2(OOCFc)4(MeOH)2(H2O)2].2MeOH.2H2O (1) (Fc = (eta 5-C5H5)Fe(eta 5-C5H4)), [Nd2(mu 2-OOCFc)2(OOCFc)4(H2O)4].2MeOH.H2O (2), and [Y2(mu 2-OOCFc)2-(OOCFc)4(H2O)4].2MeOH (3) have been synthesized and characterized by single-crystal X-ray crystallogr…
We introduce a new scheme for investigating temporally heterogeneous dynamics, which is termed time-resolved correlation (TRC). TRC is applied to data obtained by diffusing wave spectroscopy probing the slow dynamics of a strongly aggregated colloidal gel. Other examples of TRC data, collected for different jammed mat…
Magnetic, vibrational, and optical techniques are combined with density functional calculations to elucidate the electronic structure of the diamagnetic mononuclear side-on CuII-superoxo complex. The electronic nature of its lowest singlet/triplet states and the ground-state diamagnetism are explored. The triplet stat…
In recent years optical tracer techniques have been developed to determine the micro-rheology of soft viscoelastic materials. Recent theoretical arguments (Levine A J and Lubensky T C 2001 Phys. Rev. E 65 011501) suggest that the correlated fluctuations of a pair of widely separated probe particles should reflect the…
We re-analyse earlier measurements of resistance R and piezoresistance K in RuO2-based thick-film resistors. The percolating nature of transport in these systems is well accounted by values of the transport exponent t larger than its universal value t=2.0. Furthermore, we show that the RuO2 volume fraction dependence…