Self-propagating high-temperature synthesis of high-porous boron nitride
Nitrogen pressure and gravity conditions were found to affect the density, sample elongation and microstructure of foam boron nitride synthesized from borane hydrazine.
Materials Literature
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Mechanism of the low-energy fluxional process in [Fe3(CO)12−nL n] (n = 0–2): a perspective
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…
Synthesis, characterization, biodegradation, and drug delivery application of biodegradable lactic/ glycolic acid oligomers: I. Synthesis and characterization
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…
Homoleptic anionic aryloxolanthanoid(III) complexes
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…
Phase equilibria for the mean‐force potential of globular protein solutions
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…
A theoretical examination of the molecular packing, intermolecular bondingand crystal morphology of 2,4,6-trinitrotoluene in relation to polymorphicstructural stability
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…
Surface and Interfacial Structure of Release Coatings for Pressure Sensitive Adhesives I. Polyvinyl N-Alkyl Carbamates
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…
Thiophenotribenzoporphyrazines: novel near-IR absorbing dyes
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…
Site-Specific Photomodification of DNA by Porphyrin−Oligonucleotide Conjugates Synthesized via a Solid Phase H-Phosphonate Approach
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…
Second-order non-linear optical response of a novel type of charge-transfer complex, [4-DMSP]4[NH2Me2]2HSiFeMo 11O40·3H2O
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…
Electrochemically prepared colloidal, oxidised graphite
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…
Protein adsorption and platelet adhesion on polymer surfaces having phospholipid polar group connected with oxyethylene chain
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…
Electrochemical interactions of biofilms with metal surfaces
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…
Magnetic Properties and New Structural Classification of Molybdenum Phosphates Containing Mo(V)
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…
Interaction of Superplasticizers with Model Powders in a Highly Alkaline Medium
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…
A water-stable and strongly luminescent self-assembled non-covalent lanthanide podate †
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…
Properties of Silk Fibroin/Poly(vinyl alcohol) Blend Solutions and Peculiar Structure Found in Heterogeneous Blend Films*
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…
Adsorbed serum protein mediated adhesion and growth behavior of bovine aortic endothelial cells on polyamine graft copolymer surfaces
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…
NMR studies of nonplanar porphyrins. Part 2. Effect of nonplanar conformational distortions on the porphyrin ring current
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…
Aggregation of colloidal silica: Reaction-limited kernel, stability ratio and distribution moments
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…