Materials Literature
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A combined theoretical and experimental study of molybdenum phosphates containing Mo(V) either as purely Mo(V) or as mixed-valent Mo(V)/Mo(VI) and Mo(IV)/Mo(V) is performed. This investigation, based on a structural classification of molybdenum phosphates, derived from that proposed by Costentin et al., allows a detai…
Synopsis:It is broadly recognized that the adsorption of superplasticizers on cement particles is a key factor in determining the rheology of concrete.In order to avoid the problems linked to the hydration of cement, the adsorption of superplasticizers is often studied on unreactive model powders.However, in order for…
The segmental ligand 2-(6-carboxypyridin-2-yl)-1,1′-dimethyl-2′-(5-methylpyridin-2-yl)-5,5′-methylenebis(1H-benzimidazole) (L9) reacted with an equimolar mixture of LnIII (Ln = La or Eu) and ZnII in basic conditions to give selectively the self-assembled dinuclear non-covalent podates [LnZn(L9 – H)3]2+. Electrospray m…
The gelation of aqueous poly(vinyl alcohol) (PVA) solution was accelerated by addition of a small amount of silk fibroin (SF). The peculiar structure found in heterogeneous SF/PVA blend films was analysed by polarizing microcopy, differential scanning calorimetry (DSC), infrared spectroscopy (IR), and scanning electro…
Polyamine-brushed substrata for cell culture were designed by solvent casting of polystyrene-graft-polyamine copolymer (SA) on hydrophobically modified glass surface, and adhesion, spreading, and proliferation of bovine aortic endothelial cells (BAEC) on these substrata were evaluated. Adhesion and spreading of BAEC i…
The ring currents in the sterically congested and highly nonplanar porphyrin complexes 1a and 2a have been investigated using a double-dipole model of the porphyrin ring current effect. The equivalent dipoles needed to simulate the ring current in the saddle-shaped complex 1a were indistinguishable from those previous…
The kinetics of aggregation of colloidal silica, with a single-sphere diameter of 12 nm, under reaction-limited conditions, have been studied over a range of particle number concentrations and ionic strengths. Second-order rate coefficients in the initial stages of the reaction were found to vary from 3 × 10 −18 to 2…
From the reaction of the elemental lanthanides and actinides in molten alkali metal/polychalcogenide salts, several new ternary compounds have been discovered. Specifically, these phases are K 4 USe 8 (I) and ALnQ 4 (II), where A = K, Ln = Ce or Tb, and Q = Se or A = Rb, Ln = Ce, Q = Te; and NaLnS 3 (III), where Ln =…
A new type of phthalocyanine-based chromophore system having two metallophthalocyanine rings bound together through ethynyl linkages has been synthesized.
In order to investigate the effect of film thickness of thin graphite crystals on the electrical properties, we prepared thin graphite films by cleaving a kish graphite (KG) crystal with the rrr value of 32.3. The values of the thickness of the graphite films were ranging from around 300 to 1000Å. Keeping these graphi…
Amorphous magnetic glass-covered wires are of interest for basic research and potential applications. Their specific magnetic behavior originates in their very small diameters and in the high internal stresses induced during preparation. Removal of the glass cover leads to significant changes in their magnetic propert…
The compressive creep properties of hot‐pressed Si 3 N 4 8Y 2 O 3 —3Al 2 O 3 (wt%) have been investigated in the temperature range of 1543–1603 K in air. The stress exponent, n , of the power creep law was determined to be 1.5, and the activation energy was determined to be 650 kJ/mol. Transmission electron microscopy…
The distribution of residual deformation effects in textured metal sheets was studied by X‐ray diffractometric methods using a position‐sensitive detector (PSD). The elaborated procedure is based on the geometric principles of texture measurement, while the PSD technique allows to observe the profile of the X‐ray line…
The title radical ion salts of 4-iodotetrathiafulvalene1 have been prepared and their X-ray crystal structures determined at 150 K. The 2:1 salt [ITTF .+ ] 2 {Pd[S 2 C 2 (CN) 2 ] 2 } 2- 3forms a mixed stack structure in which the Pd(mnt) 2 anions intermingle with pairs of iodo-TTF radical cations, i.e. a DDADDA stacki…
Poly (D, L-lactide) (PLA) and poly (D, L-lactide-co-glycolide) (PLGA) microparticles were evaluated for their in vitro degradation behavior in 0.1 M phosphate buffer pH 7.4 at 37°C. The influence of polymer characteristics, particle size, and preparation technique was investigated. Differential scanning calorimetry (D…
FTIR spectra are reported showing the effects of thiophene on CO adsorption on Co 3 O 4 /SiO 2 and Co/SiO 2 catalysts and of SO 2 on CO adsorption on Co/SiO 2 . Six types of cobalt adsorption site were present on reduced Co/SiO 2 and all could be poisoned by thiophene or SO 2 at 295 K. SO 2 was a stronger poison than…
Dipotassium benzene-1,2-diselenolate, C 6 H 4 (SeK) 2 -1,2 obtained from the reaction of potassium tert-butoxide with a (benzene-1,2-diselenolato)zirconocene, was treated with C 6 H 4 [SeCH 2 (CH 2 OCH 2 ) n CH 2 X] 2 -1,2 (X = Cl, n = 1 1, n = 2 2, n = 3 3 or X = Br n = 3 4) leading to tetraselenacrown ethers C 6 H 4…
Ring-opening polymerization of δ-valerolactone (δ-VL) initiated with (5,10,15,20-tetraphenylporphinato)aluminum methoxide ((TPP)AlOMe, 1; X = OMe) was dramatically accelerated upon addition of methylaluminum bis(2,6-di- tert -butyl-4-methylphenolate) ( 2a ) and bis(2,4,6-tri- tert -butylphenolate) ( 2b ) via coordinat…
The chiral metallocene rac-ethylenebis(1-indenyl)zirconium dichloride, when immobilised on the surface of methylalumoxane-modified mesoporous silica MCM-41, is an effective catalyst for the production of highly isotactic polypropene with a unique spherulite morphology; Zr K-edge EXAFS studies of the organometallic–ino…
The application of glow discharge plasma to the surface of wool fabric is known to increase fiber hydrophilicity and confer a partial shrink resist effect during washing. In this work, four different polymer systems, Basolan SW, Basolan MW, Polymer G, and Polymer PL, are applied onto plasma treated wool fabric to enha…