Preparation of mesoporous tin oxide for electrochemical applications
Mesoporous tin oxide stable up to 500 °C has been prepared for the first time using both cationic and neutral surfactants.
Materials Literature
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Superlattices of Metal and Metal−Semiconductor Quantum Dots Obtained by Layer-by-Layer Deposition of Nanoparticle Arrays
Superlattices formed by arrays of Pt or Au nanoparticles have been obtained by layer-by-layer deposition by using dithiols as cross-linkers. The superlattices have been characterized by X-ray diffraction, photoelectron spectroscopy, and scanning tunneling microscopy. The core-level intensities of the metal and of the…
The corrosion of excavated archaeological iron with details on weeping and akaganéite
This review of information relevant to the corrosion processes on excavated archaeological iron is based on the current conservation and scientific literature. The first section summarizes the principal factors affecting the corrosion of iron during burial. These changes during burial are then used as a basis for disc…
Bathochromicity of Michler’s ketone upon coordination with lanthanide(III) β-diketonates enables efficient sensitisation of Eu3+ for luminescence under visible light excitation†
The electronic absorption of Michler’s ketone (MK) and related push–pull sensitisers undergoes a strong red shift upon coordination with lanthanide(III) β-diketonates, which enables unprecedently efficient sensitisation of Eu3+ luminescence for excitation at long wavelengths extending well into the visible region to a…
The Stability of Orthorhombic and Monoclinic-Layered LiMnO[sub 2]
is one of only a few ternary oxides which are known to form in the orthorhombic Pmmn structure. The layered structure, favored for application as a -insertion electrode, is found in many other alkali transition metal oxides. We find that the the strong antiferromagnetic interactions between ions contribute to the stab…
A novel property caused by frustration between ferroelectricity and antiferroelectricity and its application to liquid crystal displays-frustoelectricity and V-shaped switching
We have studied the frustration between ferro- and antiferro-electricity in chiral smectic C like liquid crystalline phases, which is not only fundamentally interesting but also very attractive from an application point of view. It causes temperature induced successive phase transitions as characterized by a devil's s…
A fluorescent molecular thermometer based on the nickel(II) high-spin/low-spin interconversion
The temperature of a fluid can be measured through a variation of the fluorescence emission intensity of a naphthalene fragment covalently linked to a NiII tetraaza-macrocyclic complex, which undergoes a temperature dependent spin interconversion equilibrium.
A double step synthesis of mesoporous micrometric spherical MSU-X silica particles
Spherical particles of mesoporous MSU-X silica in the micrometric size range have been obtained through a new double step process that led to an easy and highly reproducible synthesis pathway giving micelle templated structures with a large surface area and narrow pore size distribution
Tensile Properties of Very‐High‐Strength Concrete for Penetration‐Resistant Structures
This paper describes the potential suitability of a new family of concrete mixtures for use in protective structures. Two very‐high‐strength concrete mixtures are discussed and experimental results of penetration studies on one of these are presented. The results are compared to penetration‐study results of other, mor…
Synthesis and characterization of a new mixed-metal oxide framework material composed of vanadium oxide clusters: X-ray crystal structure of (N2H5)2[Zn3VIV12VV6O42(SO4)(H2O)12]·24H2O
The reaction of a slurry of V2O5 with LiOH·H2O and hydrazinium sulfate gives a dark colored solution that upon treatment with ZnSO4·7H2O yields the novel framework material (N2H5)2[Zn3VIV12VV6O42(SO4)(H2O)12]·24H2O, composed of three-dimensional arrays of the mixed-valence {V18O42(SO4)} clusters interlinked via {Zn(H2…
Designing banana-shaped liquid crystals without Schiff's base units: m-terphenyls, 2,6-diphenylpyridines and V-shaped tolane derivatives
This paper reports attempts to obtain (anti)ferroelectric switchable achiral banana-shaped molecules without Schiff's base units. For this purpose we have synthesized novel V-shaped molecules consisting of rigid angular central units [1,3-disubstituted benzene, 2,7-disubstituted naphthalene, 1,3-diphenylbenzene, 2,6-d…
The high-frequency dynamics of liquid water
This article is dedicated to reviewing the recent inelastic x-ray scattering (IXS) work on the high-frequency collective dynamics in liquid water. The results obtained with the IXS technique are directly compared with existing ones from inelastic neutron scattering (INS) and molecular dynamics simulation investigation…
Liquid crystals for twisted nematic display devices
This article describes the use of nematic liquid crystals in the Twisted Nematic Liquid Crystal Display (TN-LCD) since the large majority of instruments manufactured currently incorporating a liquid crystal display (LCD) utilise this type of device. The correlation between the electro-optical performance of these devi…
Modern techniques for polymer characterisation
Temperature Rising Elution Fractionation (C. Fonseca I. Harrison). Temperature Rising Elution Fractionation (J. Soares A. Hamielec). Field Flow Fractionation (J. Janca). Static and Dynamic Light Scattering (G. Berry P. Cotts). Neutron Reflection Studies of Polymers (D. Bucknall). Neutron Scattering Studies of Polymer…
New depths in cell behaviour: reactions of cells to nanotopography.
The physical and molecular biological bases of the reactions of cells to features of the topography of the substratum or environment on which and in which cells live, both in culture and in the embryo, are discussed. The fact that most, if not all, cells react to micrometric and nanometric topography is stressed. Some…
Self-assembly in water of the sodium salts of meso-sulfonatophenyl substituted porphyrins
The aggregation in water of the free bases and the diprotonated forms of p-sulfonatophenyl and phenyl meso-substituted porphyrins [sodium salts of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS4), 5,10,15-tris(4-sulfonatophenyl)-20-phenylporphyrin (TPPS3), 5,10-bis(4-sulfonatophenyl)-15,20-diphenylporphyrin (TP…
Pillared Clays and Pillared Layered Solids
Abstract Pillaring is a commonly used procedure to transform a layered crystalline inorganic compound into a material with microporosity and mesoporosity. First, the terms "layered compound, pillaring, pillaring agent and interlayer region" are defined, and then the term pillared layered solid or pillared compound. In…
Asymmetric epoxidation of alkenes catalysed by chromium binaphthyl Schiff base complex supported on MCM-41
A chromium(III) binaphthyl Schiff base complex immobilised on modified MCM-41 is an effective catalyst for asymmetric epoxidation of unfunctionalised alkenes and gave significantly higher ee than the free complex.
Metal-bonded Co-ferrite composites for magnetostrictive torque sensor applications
A new class of magnetomechanical sensor materials, Co-ferrite (CoO/spl middot/Fe/sub 2/O/sub 3/) and metal-bonded (Ag, Ni, Co) Co-ferrite composites, has been investigated. These materials exhibited magnetostriction in excess of 200 ppm and high d/sub 33/ (/spl part//spl lambda///spl part/H)/sub /spl sigma// coefficie…
Pressure-induced cubic-to-orthorhombic phase transition in ZrW 2 O 8
The crystal structure of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ and its variation with pressure and temperature have been investigated by in situ neutron powder diffraction. At room temperature, the cubic \ensuremath{\alpha} phase is stable below 0.21 GPa, where a first-order transition to the orthorhombic \ensuremath{\…