Materials Literature
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40. Noncovalent Multiporphyrin Assemblies (J-C Chambron. 41.Applications of Porphyrins and Metalloporphyrins to Materials Chemistry. 42. Metalloporphyrins as Catalysts for Precision Macromolecular Synthesis. 43. Porphyrins as Photosensitizers in Photodynamic Therapy. 44. Porphyrin-Based Electrochemical Sensors. 45. Ca…
The phenomenon of concentration quenching of the luminescence from donor ions in crystals of La 1− x Ce x F 3 solid solutions was studied. A cooperative nonradiative energy transfer from a single excited neodymium ion to a cooperative acceptor representing a couple of cerium ions, as well as from a single erbium ion t…
With the publication of nearly 38,000 calculated x-ray diffraction patterns in its new CD-ROM, the ICDD has provided users with a wealth of RIR values (i.e., reference intensity ratio values, also signified by Ill,, where c refers to corundum, the standard used currently)‘. Compared to previous CDs, this new one will…
Abstract Condensation reaction between a carboxyl terminated polyamide 12 (CTPA) ( Mn = 2000 g mol −1 ) and a dioxazoline [2,2′‐(1,3‐phenylene)‐bis(2‐oxazoline)] (OO) was achieved by reactive extrusion. Extrusion parameters effects on the process were analyzed through residence time distribution (RTD) and conversion d…
A series of bisaxially co-ordinated low-spin iron(II) phthalocyanine complexes (pc)FeL2 with different types of nitrogen bases as axial ligands has been prepared and characterised by electronic, 1H NMR and Mössbauer spectroscopies. The influence of electronic and steric effects of the axial ligands on Mössbauer quadru…
Chemically treated Si(100) surfaces in an aqueous NaOH solution at 20°C have been studied using spectroscopic ellipsometry (SE) and ex situ atomic force microscopy (AFM). The SE data indicate that a surface native oxide can be etched very slowly by NaOH etching. When the native silicon oxide is partly etch‐removed, th…
Well dispersed and fine barium ferrite (BaFe12O19) powders have been successfully prepared by mechanically activating co-precipitated precursors, followed by calcination at 700 and 800 °C. When mechanically activated in a sodium chloride matrix for 20 hours, nanocrystallites of BaFe12O19, α-Fe2O3 and a spinel (γ-Fe2O3…
The adsorption of tropocollagen type I on titanium and Ti6Al4V has been investigated using physicochemical (zeta potential measurements), biochemical (ELISA), and imaging methods (SEM, AFM). Zeta potential measurements on both materials showed isolectric points in the pHiep range 4.3-4.8 if the metal surfaces were cov…
Blood protein interaction with prosthetic surfaces seems to be the initial step in the chain of events leading to tissue incorporation of endovascular devices. This paper focuses on the relationship between surface free energy and protein adsorption on metals and polymers commonly used for fabricating vascular prosthe…
For matting of hair, multifactorial mechanisms are responsible. Thereby physical conditions, chemical agents and behavioural factors play the main roles. It seems evident that hair matting is not a hair disease; consequently, cutting off the affected hair and avoiding all possible trigger factors are the therapy of ch…
Aluminium–lithium alloys are widely used in the aircraft industry because of their low density and high elastic modulus. The Al–Li alloy 8090 has been well characterised from a mechanical viewpoint, but its corrosion mechanism has not been studied so completely. Recent work has focused on the use of electrochemical te…
The effect of accelerator combinations and antioxidants on UV radiation degradation of natural rubber (NR) latex thread with a conventional and efficient vulcanization system is presented. Zinc diethyl dithiocarbamate (ZDEC), zinc dibutyl dithiocarbamate (ZDBC), zinc mercaptobenzothiazole (ZMBT), and tetramethyl thiur…
The internal stress distribution of bagged fabric is studied theoretically and experimentally to investigate the influence of the stress distributions on fabric-residual-bagging deformation. A model is derived by using membrane theory to analyse the stress distributions for isotropic fabrics under different boundary c…
X-ray photoemission spectroscopy (XPS) has been used to investigate the growth process of K–Te thin layers with high quantum efficiency (QE) for photoemission in the UV range, prepared by sequential deposition of Te and K on a Mo substrate under ultrahigh vacuum conditions. Film formation occurs through different step…
The thermal and mechanical behaviour of a biotechnological polyester (poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) reinforced with wheat straw fibres has been investigated. In order to improve chemico-physical interactions between the components, the reinforcing agent has been previously submitted to a treatment…
The magnetic field dependence of the transverse magnetoresistance Δρ/ ρ0 and the Hall coefficient RH was measured for the graphite films of various thickness ranging from around 20 to 110 nm at temperatures between 4.2 K and 300 K. High quality of the crystallinity of these graphite films prepared by cleaving could be…
Reduction of the α-Keggin anion [Xn+O4W12O36][8 − n]− (X = H22+, B3+, Si4+) by six electrons results in the known tungsten “brown” species [Xn+O4(H2O)3WIV3WVI9O33][8 − n]− in which three W atoms have been reduced from WVI to WIV, forming a metal–metal bonded triad. The WIV atoms have terminal water coordinated in plac…
2,3-Dicarboxyaniline in its anionic state is oxidatively polymerized in aqueous solution by Na2S2O8 as an oxidant to yield oligo(2,3-dicarboxyaniline) as a novel oligoaniline. XPS analysis reveals that the structure of the resulting oligomer is 61% quinoid and 39% benzenoid with ca. 21% self-doping degree. The resulti…
A new model of solid-state polymerization of nylon-6,6 has been developed. The polymer crystalline fraction is assumed to consist of only repeat units, leaving end-groups and condensate in the amorphous fraction. Many effects neglected by previous models are considered, such as variable crystallinity, initial moisture…
In this work, melt-spun polypropylene (PP) fibers were treated in an electric field of a corona discharge. The fibers were then characterized using the thermally stimulated current (TSC) spectroscopy. It has been shown that the electret state of corona-treated PP fibers is a result of the combination of Maxwell–Wagner…