Materials Literature
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Abstract An analytical technique based on electron spin resonance (ESR) has been developed to estimate the concentration of hindered amine stabiliser additives (HAS) in a polymeric formulation. Our method involves the conversion of the overall HAS derivatives into nitroxyl‐free radicals by exposure of the stabilised p…
Abstract For Abstract see ChemInform Abstract in Full Text.
Isopenicillin N synthase (IPNS) catalyses conversion of the linear tripeptide delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-valine (ACV) to isopenicillin N (IPN), the central step in biosynthesis of the beta-lactam antibiotics. The unsaturated substrate analogue delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-vinylglycine (AC…
The two-dimension dilute magnetic semiconductors (2D-DMS) Zn 1 - x Mn x Se·0.5L (L = ethylenediamine or en, 1,3-propanediamine or pda, 1,4-butanediamine or bda, and 1,6-hexanediamine or hda) and their host compounds ZnSe·0.5L were prepared by solvothermal reaction in solvent L at 190 °C. The powder X-ray diffraction p…
Development of clinically valuable porphyrin drugs for use in photodynamic therapy requires characterization of membrane effects on porphyrin excited-state dynamics and bimolecular quenching with oxygen. This study reports on the quenching of triplet-state tetraphenylporphyrin (TPP), 5-( p -carboxyphenyl)-10,15,20-tri…
The stability of the peroxide ligand bridging two manganese ions in the trinuclear oxomanganese complex [Mn(III)(3)(mu(3)-O)(mu-O(2))(AcO)(2)(dien)(3)](2+), one of only two structurally characterized Mn clusters possessing a mu(1,2)-peroxo bridge, has been investigated using density functional theory. Although the per…
Abstract The dynamic mechanical properties of a model system consisting of a styrene–butadiene (SB) symmetric block copolymer blended with poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) have been studied. It is shown that PPO is effectively incorporated in the rigid domains of the material but that the distribution of t…
Abstract Microcapsules obtained by interfacial polycondensation from an original system based on the polyaddition of specific di‐ or polyamines and more classical acyl chloride molecules were studied. The originality of the system lies in the fact that the encapsulated agent is the internal phase allowing its incorpor…
This article is an account of the birth and evolution of surface science as an interdisciplinary research area. Surface science emanated from the confluence of concepts and tools in physics and chemistry with technological innovations that made it possible to determine the structure and properties of surfaces and inte…
In this work we report the synthesis and characterization of a new nanostructured platinum/tin/telluride inorganic/surfactant composite. The material is synthesized from soluble SnTe(4)(4-) clusters and is shown to have well-defined nanometer scale periodicity along with unique optical properties. Small-angle X-ray sc…
The reaction of Au(CH 3 ) 2 (acac) with the partially dehydroxylated surface of γ-Al 2 O 3 (calcined at 673 K) and the subsequent formation of supported gold clusters upon treatment of the supported species in He at various temperatures and 1 atm were investigated with infrared (IR) and extended X-ray absorption fine…
An analytical description for helical twisting in chiral liquid crystals is derived, which explores the correlation between the macroscopic properties of a liquid crystal and the parameters of single molecules. This theory is based on a simple model of a spiral-like rigid molecules that possess a limited number of par…
The aim of this paper is to review the actual data on the chemical bond in binary and mixed oxides. The electronegativity ( χ M ) and the acidity p a scales are the most significant semi‐empirical concepts for predicting the trend of bonding character in iono‐covalent oxides. A satisfactory correlation between the dat…
Using the controlled precipitation of silicic acid on functionalized polystyrene latexes, nanometer sized silica-coated spheres could be prepared and subsequently modified to allow dispersion in non-aqueous solvents; removal of the interior polymer by calcination resulted in the formation of hollow silica spheres.
Lymphatic distribution of interstitially injected poloxamer 407-coated nanospheres (45 nm in diameter) is controlled by surface configuration of the ethylene oxide (EO) segments of the adsorbed copolymer. At low poloxamer surface coverage, EO tails spread laterally on a nanosphere surface and assume a 'flat or mushroo…
General bonding principles are used to predict the structure of individual nanocrystals in nanocrystalline materials with semiionic bonding. The relationship between the general principles and actual nanocrystal structures is demonstrated using titanium dioxide in the anatase form. The proposed nanocrystals simultaneo…
Heteropolynuclear organometallic compounds have been constructed by using two kinds of ferrocene-based ligands, 1,1'-ferrocenedicarboxylic acid (H(2)L(1)) and ferrocenecarboxylic acid (HL(2)). Reactions the ligand H(2)L(1) with copper(II) and nickel(II) salts, in the presence of pyridine, give a tetranuclear Cu(2)Fe(2…
We examine two recently proposed models of charge ordering (CO) in the nominally $\frac{1}{4}$-filled, quasi-one-dimensional (1D) organic charge-transfer solids (CTS). The two models are characterized by site charge density ``cartoons'' $\dots{}1010\dots{}$ and $\dots{}1100\dots{},$ respectively. We use the Peierls-ex…
Abstract Paraffin oil has been encapsulated using complex coacervation of gelatin and Arabic gum in the presence of a surfactant. Addition of an oppositely charged surfactant to a polyelectrolyte markedly increases the yield of the process. We report a two‐layer encapsulation of paraffin oil, based on a primary layer…
Abstract Aqueous dispersions of polystyrene latexes encapsulating a copper phthalocyanine blue pigment were formulated using the miniemulsion polymerization technique. The organic pigment was first suspended into the monomer phase, and the resulting oily suspension was subsequently converted into stable miniemulsion d…