| Diffusion-Controlled Adsorption Kinetics of Triton X-100 at Air/Solution Interface |
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| 作者姓名： | 刘俊吉 王创业 |
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| 作者单位： | School of Sciences，Tianjin University，Tianjin 300072，China，School of Sciences，Tianjin University，Tianjin 300072，China |
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| 摘 要： | Theadsorptionkineticsofaqueoussurfactantsolu tionsatair/solutioninterfaceplaysamostimportantroleinwetting ,foamstability ,emulsionstability,fastcoat ing,detergency ,surfaceoscillation ,adsorptivebubbleseparationtechnique,etc.Theadsorption processcon sistsoftwosteps:thefirststepisthetransportofsurfac tantmoleculesfromthebulkphasetothesubsurfaceduetoaconcentrationgradient,i.e .thediffusionstep;thesecondoneisthetransportofmoleculesfromthesubsur facetothesurface,i.e.theadsorptionstep.Iftherateofth…
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Diffusion-Controlled Adsorption Kinetics of Triton X-100 at Air/Solution Interface |
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| LIU Jun-ji,WANG Chuang-ye.Diffusion-Controlled Adsorption Kinetics of Triton X-100 at Air/Solution Interface[J].Transactions of Tianjin University,2004,10(3). |
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| Authors: | LIU Jun-ji WANG Chuang-ye |
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| Abstract: | In this paper, the equilibrium surface tension and the dynamic surface tension of aqueous Triton X-100 solution at temperature 25 ℃ were measured by means of Wilhelmy plate method and maximal bubble pressure method respectively. The determined critical micellar concentration(cmc) of Triton X-100 at 25 ℃ is 2.2×10-4 mol/dm3. The adsorption mechanics of Triton X-100 at air/solution was determined. For the submicellar concentrations it is diffusion-controlled. The diffusion coefficient was calculated from the experimental data in the range of short limit. In the range of long time adsorption, the subsurface concentration is fitted from the measured dynamic surface tensions. |
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| Keywords: | diffusion-controlled adsorption kinetics dynamic surface tension maximum bubble pressure method |
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