The influence of highly charged Ce4+-cations on aqueous solutions of SDS
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- 作者：Robert Weikl ; Matthias J. Hofmann ; Hubert Motschmann ; Hubert.Motschmann@chemie.uni-regensburg.de" class="auth_mail" title="E-mail the corresponding author
- 关键词：Oscillating bubble technique ; Dilatational rheology ; Surfactant ; SDS
- 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
- 出版年：2016
- 出版时间：20 September 2016
- 年：2016
- 卷：505
- 期：Complete
- 页码：93-97
- 全文大小：906 K
文摘
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The surface dilatational modulus of aqueous SDS solution was measured in the frequency range from 3 Hz to 500 Hz by a novel version of the oscillating bubble technique. The influence of highly charged Ce4+-ions on the surface dilatational modulus and on the foam stability is analyzed.
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The experiments suggest a transition from surface visco-elastic behavior in case of solutions of pure SDS to an almost completely elastic behavior for mixed SDS/Ce4+-solutions.
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The presence of Ce4+-ions introduced as Ce(SO4)2·4H2O modifies foam stability and surface activity, i.e., a decrease in surface tension, cmc and foam stability could be observed. The results illustrate the important role of surface dilatational rheology and foam stability.