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Citation: YANG Ji-Sheng, CHEN Sheng-Bi, FANG Yun. Effect of Surfactants on the Shear Viscosity of Dilute Aqueous Solutions of Sodium Alginate[J]. Acta Physico-Chimica Sinica, ;2009, 25(04): 752-756. doi: 10.3866/PKU.WHXB200904171 shu

Effect of Surfactants on the Shear Viscosity of Dilute Aqueous Solutions of Sodium Alginate

1.
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China; School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China

Received Date: 8 October 2008
Available Online: 7 January 2009

Interactions between the anionic polyelectrolyte sodium alginate (NaAlg) and the anionic surfactant sodium dodecyl sulfate (SDS), the cationic surfactant cetyltrimethylammoniumbromide (CTAB), non-ionic surfactants octylphenol polyethoxylates (TritonX-100) as well as their compounded system were investigated by viscosity measurement techniques at different pH values in dilute solution. A hydrophobic interaction was observed in NaAlg/SDS and NaAlg/TritonX-100 aqueous solutions. By increasing the surfactant concentration the zero-shear viscosity initially decreased and then remained almost unchanged. However, the strong association between NaAlg and CTAB was affected by an electrostatic attraction and also a hydrophobic interaction. In acidic solution, the zero-shear viscosity initially increased and then decreased as the CTAB concentration increased. At a TritonX-100 concentration of 0.05 mmol·L-1, the zero-shear viscosity decreased upon addition of SDS for the NaAlg/TritonX-100 system under laboratory conditions. Upon addition of CTAB, the zero shear viscosity of NaAlg/TritonX-100 system increased at pH 3.0 and 5.0 but decreased at pH 6.4.
- Sodium alginate,
- Surfactant,
- Polymer-surfactant interaction,
- Shear viscosity
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