The cobalt(III) complexes of 4,11-diacetato-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane (1), [Co(1)]PF6, and 4,11-diacetamido1,4,8,11-tetraazabicyclo[6.6.2]hexadecane (2), [Co(2)][PF6]3, have been synthesized and characterized. The crystal structure of [Co(1)]PF6 consists of an octahedral cobalt(III) cation coordinated to all four ligand nitrogen donors in the macrobicycle s cavity, as well as to...

Pathways of initial oxidation of n-alkanes were examined in two strains of Cladosporium resinae. Cells grow on dodecane and hexadecane and their primary alcohol and monoic acid derivatives. The homologous aldehydes do not support growth but are oxidized by intact cells and by cell-free preparations. Hexane and its derivatives support little or no growth, but cell extracts oxidize hexane, hexano...

Dear Sir: In a recent article, Finkelstein (1976) has shown that the measured water permeabil i ty th rough a leci thin-decane planar bilayer m em b ran e is similar to the calculated permeabili ty t h rou g h a sheet o f n h e x a d e c a n e 50 ,~ thick. Th a t is, the measured water permeabil i ty, Pa, was found equal to DKhc/AX, where D is the diffusion constant o f water in water, Khe is t...

The spreading of small hydrocarbon droplets (pentane, heptane, dodecane, hexadecane) on the water surface was recorded using a Kodak high-speed video system with a speed of 1000 frames per second. The results showed that the spreading of low-viscosity hydrocarbons on a water surface is a very spontaneous process and is usually completed in 10-15 ms for drops with a diameter of 3-4 mm. It was fo...

Miniemulsification and emulsion/solvent evaporation techniques were combined to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles. Those nanoparticles were prepared with different PHBV molar masses and PHBV concentrations to verify their effect on the final particle size. Nanoparticles with an average diameter of 133 nm were obtained when a low molar mass (Mw = 44,350 g/...

We have used dynamic interfacial tension measurements to understand the structure of the ordered monolayer at the hexadecane/water interface induced by the presence of surfactant molecules. No abrupt changes in the interfacial tension (gamma) are observed during the expansion and contraction cycle below the interfacial ordering temperature (Ti) as observed for alkanes in contact with air. The l...

Here, we investigate the surface shear rheology of class II HFBII hydrophobin layers at the oil/water interface. Experiments in two different dynamic regimes, at a fixed rate of strain and oscillations, have been carried out with a rotational rheometer. The rheological data obtained in both regimes comply with the same viscoelastic thixotropic model, which is used to determine the surface shear...