Materials Literature
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The quality of chitosan produced from shrimp shell depends on the conditions of the chemical extraction process, including the concentration of chemicals used, the soaking time and the sequence of the treatments for deproteination, decalcification and deacetylation. The results show that 4% NaOH is a suitable concentr…
The novel convergent growth approach to dendritic macromolecules is described. Polyether dendritic sectors [G-na]-OH from the first to the fourth generations, respectively, were prepared by this approach from readily available starting material.
Copper–alkali ion exchange is used for doping superficial layers of different silicate glasses (commercial soda-lime and BK7) with copper ions. Spectroscopic and time-resolved photoluminescence properties of the obtained systems are studied in the range of 80–294 K. Analysis indicates the presence of Cu+ ions located…
Des isothermes pression–volume ont été déterminées sur trois systèmes hétérogènes « eau–zéolithe ». Les deux premiers concernent des zéolithes très hydrophobes, purement siliciques, la silicalite-1 (F − ) et la zéolithe β (F − ) ; le troisième est constitué par une zéolithe commerciale, plus hydrophile de type ZSM-5.…
This review attempts to present the most salient developments of research on organic conductors and superconductors during the past 10 years. A theoretical introduction treats instabilities of quasi-one-dimensional electron systems and associated precursor effects which are relevant to the experimental results on orga…
We tested correlations between lipophilicity parameters and the partitioning of sensitizers into membranes. For this purpose we investigated 17 porphyrins and two chlorins having various chemical structures. Some of these compounds possess an amphiphilic structure (including hematoporphyrin, deuteroporphyrin, mesoporp…
This comprehensive reference work provides an overview of, and practical guide to, the various computer-aided microscopical techniques used in materials science today. After introducing the reader to the basic concepts of optics, the interactions between light and matter, and image processing, the book goes on to disc…
The novel carborane–ferrocene conjugated dyads 1–3 and 6–8 were synthesized and their NLO properties were investigated. ortho-, meta-, and para-carboranes act as electron-withdrawing groups, and the para-carborane dyads 3 and 8 exhibited higher β values (hyperpolarizability) than the ortho- and meta-carborane analogue…
The influence of ambient concentrations of carbon dioxide on the NaCl-induced atmospheric corrosion of high purity die-cast MgAl alloys (AM20 and AM60) and MgAlZn alloy (AZ91) is reported. Samples were exposed four weeks in a carefully controlled synthetic atmosphere. Relative humidity was 95%, the temperature was 22.…
A nuclear reactor pressure vessel steel was submitted to different annealing heat treatments aimed at simulating neutron irradiation damage. The obtained microstructures were mechanically tested with subsequent metallographic and fractographic characterization. The relevant microstructural and fractographic aspects we…
Hexametaphosphate tends to increase release of both particulate and soluble lead to drinking water. In this study, for every milligram per litre of residual hexametaphosphate, soluble lead increased by ∼ 1.6 mg/L after 72‐h stagnation in pure lead pipes compared with the same condition dosed with orthophosphate. Utili…
A p-type ZnO layer was fabricated by excimer laser doping technique using thermally oxidized ZnO films. Epitaxial ZnO(0001) films were formed by thermal oxidation of epitaxial ZnSe films on Si(111) substrate grown by remote plasma enhanced metal-organic chemical vapor deposition. The p-type ZnO was fabricated by excim…
We investigated the effects of precipitation phases on the hydrogen embrittlement (HE) sensitivity of Inconel 718 by means of tensile tests. Hydrogen was charged into the test specimens via a cathodic charging process prior to the tensile tests. Various heat treatments were applied to conventionally aged specimens to…
Perylene bisimide dyes bearing one and two 2,2':6',2"-terpyridine receptor groups were prepared and the structural and optical properties of their Zn2+ complexes were investigated by 1H NMR and fluorescence experiments.
Three different thermal carbonization processes of porous silicon (PS) surface by acetylene occurring between 400 and 950 °C were observed by in situ measurements. The peak temperature of oxidation shifts from 300 to 600 °C and the activation energy from 130 to 500 kJ/mole in the samples treated at 900 °C compared to…
The aim of this study was the synthesis, physico-chemical characterization and preliminary evaluation of biological activity of novel polymer drugs based on conjugates of anti-cancer drug doxorubicin (Dox) with water-soluble polymer drug carriers based on N-(2-hydroxypropyl)methacrylamide (HPMA) copolymers. In the con…
Research Article| January 01, 2002 Non-pegmatitic Deposits of Beryllium: Mineralogy, Geology, Phase Equilibria and Origin Mark D. Barton; Mark D. Barton Center for Mineral Resources, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, barton@geo.arizona.edu Search for other works by this author on…
Fundamentals of kinetics concentration supersaturation crystal growth and nucleation rates growth rate expressions size dependent growth and growth rate dispersion shape factors size distributions nucleation rate expressions methods of growth rate measurement fixed single crystals rotating disc batch multiparticle sys…
The purpose of this study was to explore the effects of changes in Type I collagen on the viscoelasticity of bone. Bone coupons were heated at either 100 or 200 degrees C to induce the thermal denaturation of Type I collagen. Half of these specimens were rehydrated after heat treatment; the other half were tested in a…
Binary hydrous cobalt-nickel oxide with an amorphous structure (denoted as anodically deposited from a solution with its Co:Ni ratio of 4:6 and pH 8.0 exhibited a very large pseudocapacitance of ca. in 1 M NaOH. The electrochemical reversibility of this material was examined at various charging-discharging currents in…