Materials Literature
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Doxorubicin loads quite efficiently into preformed citrate containing liposomes (<200 nm) in response to an inside-acidic pH gradient: >95% loading for drug/lipid as high as 1:1 w/w. In fact, doxorubicin's loading was found to exceed theoretical predictions because it forms an insoluble complex with citrate. In this r…
This paper summarises the latest developments of the proposed acoustic emission technique. Acoustic emission signals have been processed using the three-dimensional /spl phi/-q-n distribution and the influence of electric stress, void size, void shape and test time studied. The attenuation of the AE signal through dif…
Apparent mobilities of positive charge carriers in a regioregular poly(3-octylthiophene) (POT) film at various doping levels are evaluated by an electrochemical technique combining potential-step chronocoulometry and an in situ conductivity measurement. The carrier mobility decreases from 5 × 10−3 cm2 V−1 s−1 to 5 × 1…
Improvement of electrical conductivity was attempted by polymerizing octacyanometallophthalocyanine (MPcOC; M ≡ Fe , Co ) units into one-dimensional molecular complexes. The synthetic route to MPcOC was established by reacting tetracyanobenzene with a metal(II) acetate in sulfolane. Poly(μ-pyrazine)octacyanophthalocya…
The conductivity modulus in fast ion conductors (FIC) has often been fitted with stretched exponential relaxation functions of the form $\mathrm{exp}[\ensuremath{-}(t/{\ensuremath{\tau}}_{K}{)}^{\ensuremath{\beta}}],$ where the \ensuremath{\beta} values are taken to be independent of temperature. This analysis corresp…
The effects caused by cryogenic treatment (freezing–frozen storage–thawing) of 0.5–2.0 g/dL solutions of individual starch polysaccharides, namely, amylopectin (solvents: water or 0.35M NaCl aqueous solution) and amylose (solvent: 0.35M NaCl aqueous solution), and also of 0.5 g/dL solutions of their artificial mixture…
This paper describes in terms of the mass of the solvents in the oil, water, and distillate phases the curing process of highly spheric monodispersed 4-mm-in-diameter polystyrene capsules of a uniform thickness. It was determined that the water solubility of the solvents is crucial in the solvent selection in order to…
A new calix[4]arene receptor modified with 8-hydroxyquinoline has been synthesised, exhibiting luminescence and energy transfer properties in the presence of coordinated Eu3+ and Tb3+ ions.
The specific interaction between poly(3-hydroxybutyrate) [P(3HB)] and 4,4′-thiodiphenol (TDP) and between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and TDP was investigated by Fourier transform infrared (FTIR) spectroscopy. Interassociated hydrogen bonds were found between the polyester chains and the TDP mo…
In this article, the short chain-branching distribution (SCBD) of some metallocene-based ethylene–butene copolymers was evaluated by DSC, and some conventional ethylene copolymers were also studied for the purpose of comparison. It is found that metallocene-based ethylene copolymers have a relative narrower SCBD. Thes…
A new radical anionic bridging ligand, derived from the in situ reduction of α,α′-dicyanoperfluorostilbene, is reported to support ferrimagnetic ordering below 205 K in a three-dimensional vanadium-based coordination polymer.
In accordance with an approach suggested by Kissin (J Polym Sci Polym Phys Ed 1992, 30, 1165), a general form of the Beer–Lambert law was employed to estimate the White–Spruiell biaxial orientation factors of the crystalline phase in various polyethylene blown films. Certain assumptions employed by Kissin are invalid…
A new route to the synthesis of 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane has been introduced. This polyamino derivative of 1,4,7-triazacyclononane has been used to synthesise a new ligand (L) by Schiff-base condensation with sodium pyruvate in the presence of lanthanide(III) (Ln) ions as templating agents to f…
A new technique for the enzyme-amplified lanthanide luminescence (EALL) quantification of peroxidase in bioassays is introduced. Several phenolic peroxidase substrates may be used. These are dimerised in the course of the enzymatic reaction and subsequently form luminescent ternary complexes with terbium(III) EDTA. Th…
The main question of this paper is whether and to what extend lipid bilayers can aid in the polycondensation of amino acids and peptides. This means in particular how such bilayers can favor the selection of certain sequences out of a large number of theoretical possible ones. In a first series of experiments we start…
The cure index and apparent activation energy of vulcanization of one grade of natural rubber (SMR L) and two grades of epoxidized natural rubbers (ENR 25 and ENR 50) were studied in the presence of three types of antioxidants [viz., 2,2′methylene-bis(4-methyl-6-tertbutylphenol) (AO 2246), poly-2,2,4-trimethyl-1,2-dih…
The electric self-heating behavior of graphite-powder-filled high-density polyethylene is studied. Two equations are proposed to describe the electric-field dependence of the self-heating temperature and resistance dependence of the critical field. Based on Ohmic and non-Ohmic approximations and the heat-dissipation m…
By combining data from oxide melt solution calorimetry and 29 Si MAS-NMR spectroscopy, the enthalpy for short-range Si,Al ordering in b-eucryptite (LiAlSiO 4 ) was determined for a series of samples prepared by glass annealing. Si,Al ordered b-eucryptite gives a single 29 Si NMR peak for two unresolved crystallographi…
Numerical instability of the EMTP built-in model, the Saturable Transformer Component for the three-winding case, has been the topic of interest of the EMTP community for the past twenty years. Through theoretical analysis and computer simulation, the source of the numerical instability of the component is identified…
A highly polydisperse foam is subjected to a constant liquid flow from above. For sufficiently high flow rates, large-scale bubble motion is observed, in the course of which large bubbles rise to the top of the foam until a steady state is reached at which the average bubble size increases smoothly with height.