Materials Literature
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A model for the evolution of plasticity is considered in which the phenotype, undergoing stabilizing selection, is modeled as a linear function of an environmental cue correlated with the phenotypic optimum, with the coefficients z0 and z1 evolving according to standard quantitative genetic theory. In contrast to prev…
We report here a structural and photophysical study of lanthanide monometallic complexes with the macrobicyclic axial phenolic cryptand N[(CH2)2NCH–R–CHN(CH2)2]3N (R = m-C6H2OH-2-Me-5) L as well as of bimetallic complexes with its de-protonated form (L − 3H)3−. The X-ray crystal structure of [DyL(NO3)](NO3)2·2CH3CN· 0…
Silicon oxide (SiOx) film deposition on the surface of oriented poly(propylene) (OPP) films was done to form a new oxygen gas barrier material using plasma polymerization of the tetramethoxysilane (TMOS)/O2 mixture. The SiOx film deposition on OPP films never improved oxygen gas barrier properties. The inefficacy of t…
Structural and electronic properties of electrodeposited Co ( OH ) 2 films on Au electrodes in alkaline solutions have been characterized in situ by Co K‐edge X‐ray absorption spectroscopy (XAS). The results obtained have shown that freshly prepared films undergo spontaneous partial and irreversible oxidation in 1 M K…
The yellow crystals of trans-syn-3,3′-diaryl-2,2′-biindenylidene-1,1′-diones (2) turned to reddish purple crystals when exposed to sunlight, which showed EPR signals of triplet biradicals in the solid state.
A silver/silver chloride microelectrode was developed as a liquid‐phase ion gun for investigation of precursor processes of pitting corrosion. This electrode was set as a probe electrode of a scanning electrochemical microscope and used to induce a local breakdown of passive film on iron. A small amount of chloride io…
A laboratory-based system for measurement of chemicals in sea-water with sol–gel-derived surface-enhanced Raman scattering (SERS) substrates is presented. The motivation behind this work was the development of a marinized prototype sensor. A long-term spectral stability of better than 1 cm−1 over a period of several m…
The dramatic decrease in the quantum yield of the Eu-centred luminescence recently observed in going from [Eu(NO3)3L(MeOH)] (2.8%) to the triple helical [Eu(L)3](ClO4)3 complex (8.2 × 10−5%) prompted us to perform a theoretical analysis in order to find out which parameter might be responsible for this quenching. In p…
Solid dispersions of itraconazole (ITR) in lactose, microcrystalline cellulose (MCC), and three superdisintegrants (Primogel, Kollidon CL, and Ac-Di-Sol) and their formulation into tablets were investigated with an objective of enhancing the dissolution rate of ITR from tablet formulations. X-ray diffraction (XRD) and…
The insulation effect of an inclusion complex formed by polyaniline with emeraldine base as a conducting polymer and β-cyclodextrin as insulators of cyclic form has been studied using the oxidation by iodine in solution of N-methyl-2-pyrrolidone. When polyaniline is oxidized by iodine in the solution, the solution col…
Description STP 1357 describes worldwide recent developments on this topic and examines their practical applications. It also identifies important unsolved fundamental problems. 18 peer-reviewed papers are grouped under the subheadings of Polymers and Composites. Polymers covers Composites addresses Audience: Engineer…
The atomistic simulation of properties and phenomena in solid materials requires a suitable model of the real system with a number of atoms which is still manageable at the chosen level of approximation. Since typical solids consist of atoms in the order of 1023, only a very small fraction of them can be treated expli…
Mesoporous SnO2–SiO2 composite stable up to 600 °C with a BET surface area of 350 m2 g−1 and an average pore size of 3.4 nm is successfully prepared, which exhibits promising cycling properties as anodes for lithium batteries.
A block copolymer of α–acetal–poly(ethylene glycol) and polylactide(PEG/PLA) was prepared and utilized as a surface modifier to construct a functionalized PEG layer on a PLA substrate by simple coating. An active functional group, aldehyde, was readily prepared by the derivatization of an α–acetal group at the tethere…
Silky fowl, a breed of chicken, is hyperpigmented in its various internal tissues. The pigment was extracted from various tissues of two strains of Silky fowl to determine its molecular structure and internal distribution. Analysis by infrared spectroscopy showed two spectrum patterns of the pigment in Silky fowl; one…
Polythiophene (PTh) films, both p‐ and n‐doped, have been fully characterized in a solution of (tetraethylammonium tetrafluoroborate), in propylene carbonate (PC) by a simultaneous application of cyclic voltammetry and in situ conductometry. We observed a considerable charge‐trapping effect during n‐doping of PTh with…
FTIR and FT-Raman spectra of 5-methyluracil (thymine) were recorded in the regions 400–4000 cm−1 and 50–4000 cm−1, respectively. The observed wavenumbers were analysed and assigned to different normal modes of vibration of the molecule. Ab initio and density functional calculations were performed to support the assign…
Since the curing process of an epoxy thermoset is thermally-activated and temperature dependent, thermal analysis is the most common method to monitor the process. In addition, many common temperature-dependent properties like heat capacity and modulus change with the degree of cure or extent of cross-linking. Common…
Nitrogen-containing polymeric carbon as anode materials for the lithium ion secondary battery is prepared from polyacrylonitrile (PAN) and melamine–formaldehyde resin (MF) at 600 and 800°C. Its physicochemical properties were investigated through elemental analysis, X-ray powder diffraction, X-ray photoelectron spectr…
The self-consistent model of electrical tree propagation and partial discharge (PD) activity within growing tree channels is presented. The local electric field and the damage accumulation in the dielectric material surrounding the channels govern the tree growth. The damage increment is proportional to the energy rel…