Materials Literature
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A model system was developed for the in vitro quantitative investigation of the calcification process occurring in heart valves. The process of heart valve calcification consists of the formation of calcium phosphates at the heart valve-biological fluid interface. Calcium phosphate deposits may consist of more than on…
Powders of Nb and C mixed in various mole fractions (C=10–80 mol%) have been ground in a planetary ball mill. When thus mechanically activated mixtures were transferred into a graphite crucible and exposed to air, they ignited spontaneously and self-propagating high-temperature synthesis (SHS) took place. NbC, Nb2C an…
Eight polyazomethine polymers were synthesized with different backbone structures and side groups attached. Five of these polymers, with high melting point, were subjected to DC conductivity (σ) measurements versus temperature change (300–500K). The annealed samples show consistent behaviour. The [log σ] versus [1/T]…
A family of related compounds of general formula (PPh 4 ) 2 Mn 2 [Cu(L)] 3 · n H 2 O have been synthesized, where PPh 4 + is the tetraphenylphosphonium cation and L stands for o -phenylenebis( N ‘-benzyloxamidate) (PhMe 2 opbox) ( 1 ), o -phenylenebis[ N ‘-(3-phenylpropyl)oxamidate] (PhPr 2 opbox) ( 2 ), and o -phenyl…
Nitrogen pressure and gravity conditions were found to affect the density, sample elongation and microstructure of foam boron nitride synthesized from borane hydrazine.
The methods of Bürgi and Dunitz, using crystal structures to map out an exchange pathway for the carbonyls, have been applied to [Fe 3 (CO) 12 ] and its derivatives. It has been shown that the exchange pathway follows that predicted by the concerted bridge-opening and bridge-closing mechanism. The data are inconsisten…
A series of oligomers or low molecular weight polymers of lactic and/or glycolic acid has been synthesized with different molar ratios of lactic to glycolic acid. These oligomers have been characterized with respect to oligomer composition, molecular weight, intrinsic viscosity, crystallinity, melting temperature, and…
Several anionic complexes of lanthanoid metals with the 2,6-diphenylphenolate ligand have been synthesized and their room-temperature single-crystal structures determined. In novel reactions of anhydrous LnCl 3 (Ln = Nd or Er) with NaOC 6 H 3 Ph 2 -2,6·0.5thf (thf = tetrahydrofuran) in 1,3,5-tri-tert-butylbenzene at 3…
Abstract When polymers are added to a solution containing proteins, the protein may deposit as an amorphous precipitate or as crystals. Experimental evidence indicates that from a thermodynamic viewpoint, an amorphous precipitate should be treated as a liquid phase dense in the protein and crystals as true solids. To…
2,4,6-Trinitrotoluene (TNT) can crystallise in both monoclinic and orthorhombic polymorphic forms characterised by two distinct molecular packing configurations in the solid-state associated with two conformationally unique molecules (A and B) in the asymmetric unit with four asymmetric units in the unit cell. In this…
Polyvinyl N-alkyl carbamates belong to the general class of long alkyl side chain polymers. Such polymers are commonly used as release coatings for pressure sensitive adhesive tapes. In this paper the bulk, surface, and interfacial structures of polyvinyl N-alkyl carbamates having either decyl or octadecyl side chains…
The first examples of thiophenotribenzoporphyrazines have been synthesised. The compounds obtained bear either six or eight alkyl chains and show Q-band absorptions which are red shifted relative to analogous phthalocyanine derivatives. Their formulations as spin coated films show broad band absorption extending into…
meso-Tris(4-pyridyl)[[(omega-hydroxyhexamethylene)carbamoyl]phenyl ] porphyrin was converted to its H-phosphonate derivative and conjugated using solid phase synthesis with the 5'-hydroxyl group of deoxyribonucleotides d(TCTTCCCA) and d(T)12. These conjugates were transformed into their (N-methylpyridiniumyl)porphyrin…
A novel charge-transfer complex, [4-DMSP] 4 [NH 2 Me 2 ] 2 HSiFeMo 11 O 40 ·3H 2 O 1 {4-[DMSP]I = 4[p-(dimethylamino)styryl]pyridine methiodide} prepared and crystallized in a non-centrosymmetric (space group P1) structure, exhibits second harmonic generation (SHG) of 1064 nm radiation with an efficiency 1.2 times tha…
A convenient electrochemical method has been developed for the preparation of a functionalised, colloidal graphite (oxide). The method involves the anodic erosion of graphite electrodes by the generated oxygen when using current densities less than 3 mA cm -2 . The suggested mechanism of formation involves the loss of…
We evaluated the blood compatibility of various amphiphilic polymers, that is, n-butyl methacrylate (BMA) copolymers with methacrylates having a phosphorylcholine (PC), hydroxy (OH) or methoxy (MeO) group as an end polar group in the oxyethylene side chain. The amount of proteins adsorbed on the PC-polymer from human…
Two mechanisms of microbially influenced corrosion (MIC) are discussed and compared: corrosion modified by the presence of (1) sulfate-reducing bacteria (SRB) and (2) manganese-oxidizing bacteria (MOB). It is demonstrated that the nature of MIC in both cases depends on the nature of inorganic materials precipitated at…
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…