Elongational Flow of Solutions of Poly(ethylene oxide) and Sulfonated Surfactants

Shear and extensional rheology of solutions of mixtures of poly(ethylene oxide) and anionic surfactants in ionic environments

“…Interactions between SDBS and polyvinyl pyrrolidone [21,22] exhibit similar behavior as the PEO/SDS system. Nevertheless, in a previous work we found significant differences in behavior between the PEO/SDBS and PEO/SDS systems for very high molecular weight PEO (8 × 10 6 g/mol) in extensional flows: addition of SDBS to PEO solutions at concentrations below the CAC induced a strong increase of the critical strain rate for extension thickening, which might be a result of coil contraction [23]. This effect was observed both in the absence and presence of salt and with other sulfonated surfactant (an α-olefin sulfonate).…”

“…Even though shear rheology of PEO/anionic surfactant systems has been widely studied, and our group has reported data on extensional flows of PEO/SDS [16] and PEO/SDBS [23] solutions, we are not aware of a direct comparison of the rheological behavior of such mixtures in shear and extensional flows. The main objective of this work is to perform a comparison between the shear and extensional flow behavior of PEO/anionic surfactant systems with and without addition of an electrolyte (NaCl).…”

The influence of additives and metal rods on the nucleation and growth of gas hydrates

“…The table indicates that the surface tension of the deionized water is almost half reduced with the addition of the above three anion surfactants at CMC. Experimental results [21][22][23][24] also reveal that the CMC of the three surfactants decreases with the decreasing temperature, while the surface tension of the surfactant solution increases with the decreasing temperature in the range of 293.15-308.15. Zhong and Rogers [8] also found that the CMC of lauryl sodium sulfate decreases from 9.4 mM in the water solution (at 298 K and 0.1 MPa) to 0.8 mM in the ethane and water solution (at 276.8 K and 2.52 MPa).…”

“…Table 2 shows some experimental data on the above three anion surfactant solutions in Refs. [19][20][21][22][23][24][25][26][27][28][29]. The table indicates that the surface tension of the deionized water is almost half reduced with the addition of the above three anion surfactants at CMC.…”

“…Experimental data of surfactant solution in different references[19][20][21][22][23][24][25][26][27][28][29] Fig. 6.…”