Materials Literature
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One of the most fascinating subjects in areas such as nanoscience and biomimetic chemistry is concerned with the construction of novel supramolecular nanoscopic architectures with well defined shapes and functions. Supramolecular assemblies of aromatic rod molecules provide a facile entry into this area. Aromatic rigi…
Using first-principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelectric polarization observed in the whole class of improper magnetic ferroelectrics to date. We find that the two proposed mechanisms for FE i…
The electrical conductivity of lithium borohydride (LiBH4) measured by the ac complex impedance method jumped by three orders of magnitude due to structural transition from orthorhombic to hexagonal at approximately 390K. The hexagonal phase exhibited a high electrical conductivity of the order of 10−3Scm−1. Furthermo…
The effect of nanotube/nanotube contact resistance on the electrical conductivity of carbon nanotube–based nanocomposites is studied. The tunneling resistance due to an insulating film of matrix material between crossing nanotubes is calculated by assuming a rectangular potential barrier in the insulating film. Monte…
Trirubidium diyttrium triborate contains zigzag chains of corner-sharing [Y2O10] dimers. The chains are reinforced by one independent BO3 group and crosslinked by the other two types of BO3 groups to form a three-dimensional framework. Channels along the [100] direction accommodate the Rb+ cations.
Abstract The formation of hydroxylated phases was investigated using K-depleted biotite (Na-biotite) and K-depleted muscovite (Na-muscovite) under hydrothermal treatment with alkali (Li + , K + , NH 4 + , Rb + and Cs + ), alkaline earth (Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ ), and aluminum (Al 3+ ) cations at 200°C for 1 a…
Abstract The weathering stages of K-depleted biotite, K-depleted phlogopite, and natural biotite were investigated using hydrothermal treatment with A1C1 3 solution at 200°C for 12 to 72 h. Although there were some differences in the degree of weathering of the two K-depleted micas, both first transformed to hydroxy-A…
Nitrogen doping of activated carbon (AC) was performed by annealing both in ammonia and nitric oxide, and the activities of the modified carbons for NO reduction were studied in the presence of oxygen. Results show that nitrogen atoms were incorporated into the carbons, mostly in the form of pyridinic nitrogen or pyri…
Abstract The processes of clay mineral formation were studied in seven podzol profiles developed on granitic regoliths in the Polish part of the Tatra Mountains. The selected profiles have similar parent material and macroscopically represent different stages of soil development (from initial to advanced). Bulk soil m…
Abstract The Allou Kagne (Senegal) deposit consists of different proportions of palygorskite and sepiolite, and these are associated with small quantities of quartz and X-ray amorphous silica as impurities. No pure palygorskite or sepiolite has been recognized by X-ray diffraction. Textural and microtextural features…
Abstract The structure and dynamics of alkylammonium-intercalated smectites were simulated using molecular dynamics employing the clayff-CVFF force field, the reliability of which was firstly validated for these systems. The layering behaviors of alkyl chains confirm the scenarios of the monolayer, transition and bila…
How thick should the sample be for a transmission THz-TDS measurement? Should the sample be as thick as possible? The answer is `no'. Although more thickness allows T-rays to interact more with bulk material, SNR rolls off with thickness due to signal attenuation. Then, should the sample be extremely thin? Again, the…
The NaAlH 4 complex is attracting great attention for its potential applications in hydrogen-powered fuel-cell vehicles due to its high hydrogen storage capacity and suitable thermodynamic properties. However, its practicable hydrogen storage capacity presently obtained is less than the theoretical capacity (5.6 wt.%)…
This paper describes the use of several characterization methods to examinealumina nanotubule membranes that have been modified with specific silanes. The functionof these silanes is to alter the transport properties through the membrane by changing thelocal environment inside the alumina nanotube. The presence of alk…
Ferroelectric Pb[Zr 0.4 Ti 0.6 ]O 3 ceramics codoped with La 3+ and Fe 3+ at dopant concentrations of 1.0 and 0.5 mol. %, respectively, were investigated by means of multifrequency electron paramagnetic resonance (EPR) spectroscopy. The results prove that iron is incorporated at the [Zr,Ti]-site, acts as an acceptor a…
The genus Pinnularia Ehr. (Bacillariophyceae, Bacillariophyta) is very frequently found in algal communities of acidic environments. Several Pinnularia strains isolated from the thermal acidic area of Pisciarelli (Naples, Italy) have been investigated by using a combination of morphological, ecophysiological and molec…
The reaction of [AuCl(PR'3)] with KTeR, prepared from RTeTeR and K-selectride, gives the gold-tellurolate clusters [Au8(mu-TeR)8(PR'3)4] (R = Ph, Tol; PR'3 = PPh3, PPh2py) in high yield. This result contrasts with the one obtained from the reaction with thiolates or selenolates, from which mononuclear complexes are sy…
The tris(1,10-phenanthroline)ruthenium(II) complexes 1–3 (with 0, 4 and 2 appended azacrown ether units, respectively) linked via alkyl chains to 4H-cyclopenta[2,1-b:3,4-b′]dithiophene (CPDT) were synthesised, characterised and immobilised on Pt and ITO electrodes through electropolymerisation. The electrochemical, UV…
A new approach to directly organize colloidal particles into patterned arrays using a nanostructured polymer template coated with polyelectrolyte multilayers is introduced. The topological template with both positive and negative charges provides a finely defined chemical nanopattern to guide selective deposition of c…
A self-assembled trimeric ring-shaped aggregate of an aluminium(III) porphyrin bearing a benzoic acid in one meso-position has been characterized by NMR-spectroscopy and MALDI-TOF spectrometry.