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A Surface Rheological Study of Silwet L-77 Surfactant at the Air/Water Interface
Authors:Fu Han  Yanhong Chen  Yawen Zhou
Institution:School of Chemical and Environmental Engineering, Beijing Technology and Business University , Beijing , P. R. China
Abstract:The dilational viscoelastic properties of Silwet L-77, a trisiloxane surfactant of the general formula (Me3SiO)2SiMe(CH2)3(OCH2CH2)7.5OH, at the air/water interface were investigated. Aqueous solutions of Silwet L-77 were spread onto a pendant drop and the dynamic surface tensions were measured by means of axisymmetric drop shape analysis. The surface dilatational elasticity, viscosity, and phase angle of the adsorption monolayer were also determined using the oscillating drop technique. The influences of frequency and concentration on the surface dilational properties were expounded. It is shown that the surface dilational modulus and elastic modulus increased with the increase of frequency, the viscous modulus was complex, while the phase angle decreased with the increase of frequency. Surface dilational modulus, elastic modulus, and viscous modulus passed through the maximum with the increase of bulk concentration and the phase angle increased with the increase of concentration.
Keywords:Dilational viscoelasticity  elastic modulus  phase angle  trisiloxane surfactant  viscous modulus
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