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。
Novel liquid crystals based on fluorinated carbon chains and terminated with SF 5 groups are presented for the first time. Attachment of an SF 5 group separated from a benzylidine group by a fluorinated spacer leads to monotropic nematic and smectic phases, while an enantiotropic nematic phase is observed in mixtures.…
Although it is known that growing cracks will interact with pores, it is unclear whether the magnitude of this effect is sufficient to influence the fracture energy. To study this, experiments have been carried out where cracks have been grown through simple distributions of pores in poly(methyl methacrylate). These s…
Resonant photoemission of single crystals of the double perovskites $\mathrm{Gd}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\mathrm{\ensuremath{\delta}}}$ and $\mathrm{Dy}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\mathrm{\ensuremath{\delta}}}$ has been carried out at the UK Synchrotron Radiation Source at Daresbury.…
Abstract Pyrochlore has been considered as a waste form to immobilize high-level nuclear waste such as excess weapons-grade plutonium. In order to study the aqueous stability of pyrochlore, we have carried out hydrothermal experiments with a natural microlite (Nb + Ta > 2Ti; Ta ⩾ Nb) at 175°C in a neutral and acidi…
The transparent semiconducting copper iodide ( CuI ) films were deposited by pulsed laser deposition (PLD) and their structural and optoelectrical properties in the power output of TiO 2 | Dye | CuI cells are reported. These CuI films exhibited optical transmittance of over 80% in the wavelength range from 400 to 900…
We report photoemission and near-edge x-ray absorption fine structure measurements of the occupied and unoccupied valence electronic states of the regular surface layer of Bacillus sphaericus, which is widely used as the protein template for the fabrication of metallic nanostructures. The two-dimensional protein cryst…
A VHF method (30-300 MHz) is applied to identify faults and defects in ceramic insulators. Insulators which exhibit internal cracks and fractures are used as test samples. Different artificial conditions are introduced to the test samples according to the IEC 507 standard under wet and dry conditions. Using a cascadin…
Accelerated aging of two types of commercially produced medium voltage XLPE insulated cables was carried out under the combined stresses of three types consisting of ionic aqueous species, elevated electrical stress and temperature cycling. After 1000 h of aging, the water tree parameters were evaluated. Results show…
The relative non-specificity of the first generation MR contrast agents has meant that a new approach to their design is required. This review focuses on a new class of more specific or functional agents. These are the so-called "activated", "smart" or "responsive" contrast agents. The relaxivity of an activated contr…
Chitosan, a derivative of the natural amino polysaccharide chitin, has proven effective as a potential environmentally benign antimicrobial component. Few studies have focused on chitosan applied to wood against wood-inhabiting and decaying fungi. In these screening studies several mycological experiments were perform…
Monolithic t ‐ZrO 2 (tetragonal structure) nanopowder is synthesized with an amorphous ZrO(OH) 2 · x H 2 O polymer precursor. The H 2 O molecules impart the structure and promote reconstructive thermal decomposition of the structure to t ‐ZrO 2 nanoparticles on heating at temperatures as low as 200°C. A prevalent endo…
Abstract This work describes the use of nanoporous alumina membranes for the diffusion of crystal violet molecules, encapsulated in the micelles of sodium dodecylsulfate (SDS), through pores ranging between 20 and 200 nm in diameter. The encapsulation of the crystal violet in SDS micelles is necessary in order to enla…
A fast integrated enzyme-based pretreatment process concept for cotton containing textiles has been developed for operation in the continuous mode. The total processing time for the desizing and scouring operation is 3–10 minutes for fabrics with a weight of 120–300 g/m2. Essential elements in the process are the high…
Metal colloids immobilized on a glass support substrate are modified with a self-assembled alkylsilane (C18) layer to promote adsorption of polycyclic aromatic hydrocarbons from aqueous solutions. Detection of these compounds from low concentration solutions is accomplished by using surface-enhanced Raman scattering (…
Achieving high signal amplification in surface-enhanced Raman scattering (SERS) is important for reaching single molecule level sensitivity and has been the focus of intense research efforts. We introduce a novel chemical enhancer, lithium chloride, that provides an additional order of magnitude increase in SERS relat…
This paper concerns the problem of orientations of domain walls in ferroelastic and/or ferroelectric single crystals. They are specified on the basis of elastic compatibility of the neighbouring domains. Results are presented in form of tables, which make it possible to find spontaneous tensors (i.e. strain and polari…
The existence and nature of spin-polarized surface-localized electronic states is expected to have profound consequences for structural, electronic, and spintronic properties of half-metallic materials. It is therefore essential that calculations of such properties take fully into account the possibility of surface re…
Structural and electronic properties of metal-doped silicon clusters ($M{\mathrm{Si}}_{10}$, $M=\mathrm{Li}$, Be, B, C, Na, Mg, Al, and Si) have been investigated via ab initio molecular dynamics simulation under the formalism of the density functional theory. The exchange-correlation energy has been calculated using…
Abstract Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO 2 (L)(Solv) and WO 2 (L) (L = tridentate, trans-2- aminocyclohexanol derived chi…
This study focuses on the effect exerted by interchain disulfide bonds on the functional properties of films made from gliadins when cross-linked with cysteine. Gliadins were extracted from commercial wheat gluten with 70% aqueous ethanol, and cysteine was added to the film-forming solution to promote cross-linking be…