Materials Literature
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A theoretical study of lithium intercalation into the transition metal oxide cathode material, V6O13, is presented. A combination of classical and quantum mechanical computational simulation techniques are used to predict the stable sites occupied by inserted lithium ions, changes to the unit cell dimensions as lithiu…
Eight cation radical salts of tetrathiotetracene (TTT) with a series of 2-alkoxytetracyanoallyl anions (RO-TCA−; R = Me, Et, Prn, Bun) were prepared by electrocrystallisation. All of them were non-magnetic semiconductors. Seven crystal structures were determined. The physical and structural aspects of the salts were w…
Acrylic acid and HCl-doped polyanilines were synthesized by chemical oxidative polymerization. The synthesized materials were used as sensors for ammonia. Comparison of the responses of the two polymers reveal that the acrylic acid-doped polymer exhibits higher sensitivity and reversibility. Further, the resistance is…
In this short communication we describe the synthesis and the optical and magnetic properties of optically active three dimensional (3D) bimetallic [Cr-Mn] networks [[Delta Cr(III) Delta Mn(II)(ox)(3)][Delta Ru(II)(bpy)(3)]ClO(4)](n)1 - Delta, [[Lambda Cr(III)Lambda Mn(II)(ox)(3)][Lambda Ru(II) (bpy)(3)]ClO(4)](n) 1 -…
Influences of the formation behavior of the R phase on the hardness and the impact toughness were experimentally studied for high nitrogen duplex stainless steels containing 25 mass% of Cr, 7 mass% of Ni, 3 to 5 mass% of Mo, 0.14 to 0.27 mass% of N, and 0.02 mass% of C. The steels were solution heat treated at 1 323 K…
Microporous membranes of high-density polyethylene were prepared by melt-extrusion followed by annealing and uniaxial extension. Crystallization at a high melt flow rate and subsequent annealing of the spun films with fixed ends led to the formation of oriented hard-elastic materials with a high modulus of elasticity…
The transverse and longitudinal effective thermal conductivity and contact conductance of discontinuous and misoriented graphite fiber-reinforced composites has been studied over a range of temperatures (20-200°C) and pressures (172-1720 kPa). Three different fiber types (DKE X, DKA X, and K22XX) and three fiber volum…
Abstract This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections deali…
Des echantillons de diatomees tychoplanctoniques et epilithiques ont ete preleves tous les mois pendant une annee sur 18 stations dans le cours inferieur de quelques fleuves et rivieres de la region nord-centre du Portugal. L'analyse canonique des correspondances a ete utilisee pour examiner les relations entre les va…
The physical and mechanical properties of aliphatic homopolyesters from monomers obtainable from renewable resources, namely, 1,3-propanediol and succinic acid, were improved by their combination with aromatic urethane segments capable of establishing strong intermolecular hydrogen bonds. Segmented poly(ester-urethane…
The surface free energy and its dispersion and polar components of pigskin were determined by wettability measurements. The contact angles and work of adhesion of solutions of the synthetic model adhesive sequence poly(Gly-Tyr-Lys) inspired by marine adhesive proteins were measured on the epidermis and the dermis of p…
The knowledge of the exact electronic structure of Co(II) porphyrins is important in view of their interest as models for the prosthetic groups in proteins and in view of their use as catalysts. Here, we present a continuous wave and pulse electron paramagnetic resonance (EPR) study of CoTPP (5,10,15,20-tetraphenyl-21…
The complex cobaltite TlSr2CoO5 undergoes a first-order metal–insulator phase transition at room temperature. The structures of the high temperature (HT) and low temperature (LT) phases have been refined on powder samples using electron diffraction, X-ray diffraction and EXAFS. The HT-phase is isostructural with the s…
The structural and thermodynamic behavior of the complex formation of eIF4E with either or both mRNA cap analogue (m7GTP, m7GpppA, or m7GpppG) and 4EBP1 has been investigated by spectroscopic measurements. Although the circular dichroism (CD) spectrum of eIF4E was little affected by the association with any cap analog…
Ba ++ , Pb ++ , and Cd ++ . The addition of Mn ++ , Ba ++ , and Ca ++ (10 mM) during the hydrolysis of Avicel PH 101 caused an increase in the total reducing sugar (TRS) for CBH I by 142, 135, and 114 percent, respectively. Those for CBH II increased by 177, 175, and 115 percent, respectively. The Mn ++ was the most s…
Terpolímeros de poli(álcool vinílico) foram sintetizados por meio de reação de esterificação do PVA parcialmente hidrolisado com cloretos de ácidos graxos de comprimento de cadeia diferentes. O objetivo da síntese foi obter polímeros à base de PVA com pequenas variações no balanço hidrófilo/lipófilo e nas propriedades…
A range of electron-rich organic molecules has been intercalated into MoS2 by the method of exfoliation–reflocculation. Intercalation produces an expansion of the lattice in a direction perpendicular to the dichalcogenide layers, the magnitude of which suggests that in the majority of cases, the guest adopts an orient…
The binding of tetracationic Λ- and Δ-europium complexes of tetraamide and triamide ligands incorporating an N-methylphenanthridinium group to calf-thymus DNA, poly(dGdC) and super-coiled plasmid DNA has been monitored by absorption, luminescence and CD difference spectroscopy. With the tetraamide complexes, preferent…
Efficient syntheses of the novel, pyrene containing branched building blocks 10, 13, 22, 25 and of a pyrene based core molecule 16 for the construction of dendrimers are reported. The main tool is a Suzuki cross-coupling. The functional groups for further growth are amines and carboxylic acids, which were used in an o…
Natural-silica-rich glasses (impactites, tektites and obsidians) have been investigated with infrared (IR), Raman and optical spectroscopy. Comparison with artificial glasses with silica-rich and alkali-rich compositions is made. The vibrational data of these compounds are discussed in relationship with their structur…