Materials Literature
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The oxidative decarboxylation of α-aryl carboxylic acids to the corresponding carbonyl derivatives was observed in catalytic systems containing tetrabutylammonium periodate and metallotetraphenylporphyrins (metal=FeIII or MnIII) at room temperature.
Detailed loss and current distributions in the foil-wound low-voltage winding of a 6 MVA transformer using a finite-element analysis package are presented. The foil-winding eddy loss is estimated and its variation with clearance to yoke is examined. Plots of foil current and eddy-current density and loss-intensity dis…
The development of crazes in polycarbonate is investigated with the method of ultra small angle X-ray scattering of synchrotron radiation. Measurements at T = 130°C are discussed. The two-dimensional scattering patterns are analysed by means of a simple fibrillar model of the crazes. The geometrical parameters of the…
A simplified mechanism for the depolymerization of nylon-66 and nylon-6 mixtures via the ammonolysis route is proposed here. The mechanism includes the amide link breakage and amide end dehydration (nitrilation) reactions, plus the ring addition and ring opening reactions for cyclic lactams in nylon-6. On the basis of…
The first use of polyhedral silsesquioxanes to organize ensembles of biologically relevant motifs is described. N-Protected amino acids and peptides can be attached to [H2N(CH2)3]8Si8O12 1 and [p-HOCH2C6H4]8Si8O12 2 in either a convergent fashion or a divergent fashion to produce peptidyl silsesquioxanes in excellent…
Carboxylate-bridged cobalt–lanthanide complexes [Co2Nd(O2CCMe3)6(C9H7N)2(NO3)] and [Co2Er2(O2CCMe3)8(C9H7N)2(NO3)2] have been prepared and structurally characterised by X-ray diffraction; both of them are found to be antiferromagnetically coupled.
Lead magnesium niobate Pb(Mg1/3Nb2/3)O3 — lead titanate PbTiO3 [abbr. as (1 — x) PMN — x PT] ferroelectric ceramics with different excesses of MgO and PbO were systematically studied under different processing conditions for ferroelectric refrigeration application. It was found that the excess amount of MgO and PbO, a…
A new perovskite related Sr0.97NbO3 phase has been synthesized. Although both powder X-ray diffraction and selected area electron diffraction studies suggest a primitive cubic perovskite structure with ap ≈4.023 Å, high resolution powder neutron diffraction reveals a subtle lattice distortion from cubic symmetry. The…
Raman microscopy has been used to study kaolinites and dickites and their intercalates and to identify dickites in kaolins at low concentrations. During the intercalation, with potassium acetate, of a low defect structure kaolinite, several crystals provided significantly different Raman spectra. This led to the propo…
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…