Materials Literature
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The reactions of polylactic acid (PLA) oligomers and isocyanates (4,4′-diphenylmethane diisocyanate and toluene diisocyanate) are reported. The effects of the reaction conditions, that is, the reaction time, reaction temperature, molar ratios, isocyanates, and catalyst, on the number-average molecular weight (Mn ) are…
IR spectra of single phase sulfuric acid hydrates have been measured and the conversion between sulfuric acid monohydrate (H3O+HSO4−, SAM) and sulfuric acid tetrahydrate ([H5O2+]2SO42−, SAT) as a function of temperature and water partial pressure pH2O has been followed using the principal absorption bands of the four…
We investigated the composition, properties, and utility of a novel hybrid material of poly(N-isopropylacrylamide)-grafted silica. The modified silica was prepared in two steps: (1) grafting silane layers of active precursors, such as initiator, transfer agent or comonomer onto the silica surface by solution depositio…
BWR fuel cladding corrosion and hydriding performance may limit the fuel residence time. Historically, out-of-pile high-temperature steam tests have been used to predict the BWR corrosion performance of Zircaloy materials. However, results indicate that no correlation exists in many cases between in-pile and out-of-pi…
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…