Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (04): 752-756.doi: 10.3866/PKU.WHXB200904171

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

 YANG Ji-Sheng, CHEN Sheng-Bi, FANG Yun   

  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:2008-10-08 Revised:2008-12-15 Published:2009-03-31
  • Contact: YANG Ji-Sheng; FANG Yun;

Abstract: 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.

Key words: Sodium alginate, Surfactant, Polymer-surfactant interaction, Shear viscosity


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