Materials Literature
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Depending on the reaction conditions and the ionic radius of the lanthanide ion, tetraphenyldisiloxanediol, (Ph2SiOH)2O, reacts with [Ln{N(SiMe3)2}3{LiCl(thf)3}3] (Ln = Eu, Gd, Sm) to afford novel heterobimetallic rare earth disiloxanediolates, some of which can be regarded as ‘inorganic lanthanide metallocenes’; a ri…
Electrochemical studies were made of the influence of Cu on pitting behavior and active dissolution of 25% Cr duplex stainless steels (DSS) in chloride-containing neutral and acid solutions. Alloys with increased Cu content showed higher pitting potentials (Ep) in 1 M hydrochloric acid (HCl) and 3.5% sodium chloride (…
The Schiff bases 2,2′-bis{N-[(2-diphenylphosphino)phenyl]formimidoyl}biphenyl (L1) and 2,2′-bis{[(2-diphenylphosphino)benzylidene]amino}biphenyl (L2) were synthesized from the appropriate amine and aldehyde. Their co-ordination behaviour towards PdII, PtII and NiII has been studied. Dinuclear complexes were formed whe…
Microcrystalline cellulose 19 parts was combined with sodium carboxymethylcellulose, hydroxypropylmethyl cellulose, hydroxypropyl cellulose or polyvinylpyrrolidone one part, either by spray-drying or physical mixing. This combined excipient (20%) mixed with lactose (80%) and water was added to aid formation of pellets…
To develop the optimal operational strategy for the PL promoter of interferon (IFN)-gamma-producing Escherichia coli, some rational medium feeding methods, carried out just after temperature induction to control the postinduction specific growth rate (mu i), were designed. Using experimental data from various batch cu…
Porcine gelatin (heat-denatured collagen) was digested with a bioreactor using an enzyme-coupled matrix (ECM) with purified collagenase. The digested gelatin, FreAlagin type R (M.W. range 200-10000 Da), was further purified by an HPLC system depending upon molecular size. The molecular weight range of the purified fra…
The current study was designed to evaluate the properties of thermosensitive magnetoliposomes (TMs), a new drug carrier proposed by the authors, in an electromagnetic field pertaining to their selective heating and drug release under an in vivo condition. TMs containing 5-fluorouracil (5-FU) were prepared by reverse-p…
The hydrothermal synthesis mixture Ge–Se–(TMA)OH–H2O (TMA+ = NMe4+) yielded crystals of the material (TMA)4Ge4Se10. A single-crystal X-ray diffraction structure showed the presence of adamantanoid Ge4Se104– clusters and TMA+ cations. The TMA+ template-mediated aqueous synthesis of (TMA)2MGe4Se10 (M = Mn or Fe) from Ge…
The purpose of this study was to characterize the solubility and thermodynamic properties of the optical isomers of the anti-schistosomal drug, praziquantel (PZQ) and to compare these properties to those of the racemic product used in commercial preparations (Biltricide, generic drugs). The crystalline enantiomers of…
Simultaneous carboreduction and nitridation (CRN) of Y2O3 doped SiO2 /clay or elemental Si/clay mixes at atmospheric pressure were used to prepare low-cost powders of α-sialon composition. The synthesised products contained crystalline phase mixtures of α- and β-sialon and Y3Si6N11 . Subsequent hot pressing of the CRN…
A series of 5,10,15,20-tetraphenylporphyrins (TPPs) bearing different numbers and orientations of β-ethyl substituents have been used for studies on the functionalization of non-planar porphyrins. Attempts to monofunctionalize the diethyl-TPP via monobromination failed and resulted in the isolation of two different re…
Layered polysilane (Si6H6) and its thermolysis have been studied using FTIR spectroscopy, thermogravimetry/differential thermal analysis, mass spectrometry, electron paramagnetic resonance, Si K-edge absorption and photoluminescence spectroscopy. It is found that cross-linking between (–Si6H6–)nlayers occurs through d…
Raw montmorillonites treated with mixed Al–Fe pillaring solutions, with Fe/(Al + Fe) molar ratio between 0.1 and 1, and heated at 300 °C lead to large d-spacings according to XRD which increase from 52 Å for the sample with the lowest iron content to 76 Å for the pure Fe-treated clay sample.
Article The Energetics of Cubic Zirconia from Solution Calorimetry of Yttria- and Calcia-Stabilized Zirconia was published on January 1, 1998 in the journal Zeitschrift für Physikalische Chemie (volume 207, issue 1-2).
Hybrids of epoxy resin and silica cured respectively with methyl nadic anhydride (MNA) and 4,4′-diaminodiphenyl sulfone (DDS) were prepared. Control of the morphology was achieved through functionalisation of a diglycidyl ether resin respectively with monofunctional and difunctional secondary amine trialkoxysilanes pr…
The photo-oxidation reactions of several meso-tetraphenylporphyrins have been studied in order to ascertain the chemical stability of this class of compounds towards singlet oxygen. The 2,6-disubstituted ones showed an excellent stability, whilst this is not the case for other porphyrins with different substitution pa…
1. INTRODUCTION Dispersions of inorganic fillers within polymers are commonly designated as polymer-based composites. The properties of these materials are isotropic or anisotropic, depending on the geometry of the filler particles and the effect of the processing conditions on their orientation. Fillers are used to i…
The crystal structures of four compounds from a family of commonly used molecular building blocks of nonlinear optical materials, aminonitropyridines, have been determined. The structures of 2-amino-5-nitropyridine 1, 2-amino-5-nitropyridine monohydrate 2, and of two new polymorphs of 2-amino-3-nitropyridine 3,4, are…
Selective growth behavior of {110} <001> grains has been studied utilizing the temperature gradient annealing method. As grains grow, the average deviation angle from the ideal {110} <001> orientation becomes smaller and orientation distribution changes corresponding to that of coincidence grains in the matrix. Second…
The quantitative determination of Gd-containing magnetic resonance imaging (MRI) contrast agents in animal tissues is performed by both ICP-AES and ICP-MS. While ICP-AES has been used to determine Gd-containing contrast agents by other workers, no published methodology has been found. An accurate and precise method us…