کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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595600 | 1454018 | 2010 | 6 صفحه PDF | دانلود رایگان |
Wetting films from aqueous solutions of three different polymeric surfactants (hydrophobically modified inulin with two degrees of substitution, INUTEC SP1 and HMI-B, and hydrophobically modified polyacrylate, EFKA) were obtained on hydrophobic glass surfaces with different degrees of hydrophobicity. The equilibrium film thickness h was measured as a function of polymeric surfactant concentration C. For surfaces with low degree of hydrophobicity h increased, whereas for surfaces with high hydropobicity h decreased, with increase of CSP1. For HMI-B with higher degree of substitution h remained virtually constant for surfaces with low degree of hydrophobicity, while for high degree of hydrophobicity h increased with increase of CHMI-B. With EFKA h decreased with increase of polymeric surfactant concentration. The addition of 0.05 M NaCl caused a significant reduction in film thickness. A tentative explanation of the differences between the three polymeric surfactants was given in terms of the electrostatic interaction contribution. Two main features have been established: (i) stable films exist at high polymeric surfactant concentration and low degree of hydrophobicity of the solid surface; (ii) unstable films that rupture at low polymeric surfactant concentration and high degree of hydrophobicity of the solid surface.
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 354, Issues 1–3, 5 February 2010, Pages 22–27