A common question among researchers is what happens when both oil (here represented by paraffins) and surfactants (here modeled with SDS) occur together in the feed water, as the two components interact. The adopted SDS concentration was lower than its critical micelle concentration (CMC, ~8.2...
CTAB, on the other hand leads to a lower interfacial tension than observed for SDS, and thus more deformable oil droplets. At high ionic strength, increased surfactant adsorption leads to such a low oil-water surface tension that the oil droplets can permeate through the much smaller membrane ...
Pseudomonas is a genus of non-fermentative gram-negative Gammaproteobacteria found both on land and in the water. Many terrestrial isolates of this genus have been studied extensively. While many produce bioactive substances, enzymes, and biosurfactants, other Pseudomonas isolates are used for biological...
Modeling and assessment of produced water discharges emitted from offshore petroleum platforms in the East Coast of Canada The discharge of produced water accounts for the largest volume of waste associated with offshore oil and gas production operations. With the development and expansion of Canada'...
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Here, the build-up of a cake layer on top of the membrane could slow down, via electrostatic repulsion, the diffusion of SDS and CTAB molecules into the membrane. Moreover, the free surfactant concentration in the oil-in-water emulsion may be lower, as many surfactant molecules are bound ...
The buffer autoclave and crystallization autoclave are heated using thermostatic water baths, and the accuracy of temperature sensors are ± 0.1 ℃. Figure 2 Schematic of the detailed experimental device. Full size image Firstly, CO2 in the cylinder is cooled down to the dense liquid phase ...
The hydrogen bonding between cellulose chains can be replaced by water molecules, which possibly promotes the swelling of cellulose [55]. Surfactants may contribute to disturbing hydrogen bonding and thus make cellulose more accessible to cellulases [56]. Lipopeptide increased the proportions of free ...
The sample was resuspended in 1500 μL of extract solution (acetonitrile:methanol:water = 2:2:1, with isotopically labelled internal standard mixture). After 30 s of vortexing, samples were sonicated for 10 min in an ice-water bath. Next, the samples were incubated for 1 h ...
The relatively large variation in temperature at St 2 indicates, however, that this water body mixed to a certain extent with surrounding waters during the course of the diel sampling. Diel dynamics of virioplankton in the open North Sea Viral and bacterial abundance and produc- tion. The mean...