The fluids in the channel are water colored by fluorescein, to permit flow visualization with a fluorescent microscope, and tetradecane with surfactant (Span 80) at varying concentrations.
In the situation where there is no surfactant in tetradecane, the flow regimes are deeply changed (Figure 5): the patterns are made of oil or water blobs, which may stay at the wall or move, in a random process.
These blobs are stuck at the walls of the channel and their dynamic is governed by the impurities or inhomogeneities at the wall.
As we move from ethanol to isopropanol to tert-butanol, we are increasing the nonpolarity of the compounds because we are increasing the size of the molecules.
If you consider the interfacial tension between ethylene glycol and tetradecane 13 dyn/cm, it becomes clear that ethylene glycol is less polar than water and the attractive forces between the two molecules are greater or the repulsive forces are less than for water and tetradecane.
Tetradecane is a lot less soluble in water than any of the other components.
The xylenes and dichlorobenzene appear to differ quite a bit in space and time while naphthalene and tetradecane appear to be relatively consistent.
Tetradecane, xylenes, and naphthalene are all components of the jet fuel that was disposed of in the area.
The differences shown among the tetradecane:xylenes ratios in the three free phase samples are not large in comparison to the differences observed between the free phase and soil ratios.
Tetradecane was added to the dry lipid by weighing directly.
Results suggest that decane partitions more into the hydrocarbon chain regions of the phospholipids, and tetradecane is restricted more to the interstitial regions and the regions between hexagonal tubes.
Decane, and not tetradecane, causes a decrease in the monolayer bending modulus.
Studies of the hydrocarbon utilizing yeasts Candida maltosa and C. lipolytica have shown that both were capable of reducing recoverable amounts of branched chain and aromatic hydrocarbons in a mixture of naphthalene, tetradecane, hexadecane, pristane (tetra-methylpentadecane).
Cells of C. lipolytica grown on either glucose or tetradecane were capable of binding (rendering unextractable) nearly 50 per cent of the hydrocarbon mixture within 3 hours.
In contrast cells of C. maltosa bound hydrocarbons only after growth on a hydrocarbon medium.
Experiments were carried out in columns of 0.1, 0.15, 0.38 and 0.63 m diameter.
Air was used as the gas phase in all experiments while the liquids used were demineralised water, tetradecane, EDM (a paraffin oil) and Tellus Oil (a viscous hydrocarbon oil).
Pressure taps were installed along the height of the columns for the determination of gas holdup.
First-Order Phase Transition in Mixed Monolayers of Hexadecyltrimethylammonium Bromide and Tetradecane at the Air-Water ...(Site not responding. Last check: 2007-10-09)
Mixed monolayers of CTAB (hexadecyltrimethylammonium bromide) and tetradecane were formed at the air-water interface by addition of small amounts of tetradecane to the surface of a CTAB solution below the critical micelle concentration.
Ellipsometry and sum-frequency spectroscopy were used to demonstrate that these mixed monolayers exhibit a first-order phase transition from a conformationally disordered to a conformationally ordered state as the temperature is lowered.
For the sake of comparison, the joints which were identical in the contour but formed by using a conventional rosin-line low active flux were also included.
As a result, it was found that four items of alkanes apart from hexane (C.sub.6 H.sub.14) and pentatriacontane (C.sub.35 H.sub.72) have tensile strengths equivalent to those of the conventional items.
