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Surface Activity of Newly Nonionic Surfactants at Air/Water Interface and their Interaction with Clay and Teflon

  • R. Abdel-Rahem and A. S. Ayesh
Published/Copyright: April 2, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 45 Issue 3

Abstract

The surface activity of newly nonionic hydroxyl mixed ether surfactants HMEn at air/water and solid/water interfaces was studied as a function of ethoxylation degree (n-value). The characteristics of this series of nonionic surfactant, including surface tension, critical micelle concentration cmc, adsorption onto hydrophilic saponite clay and hydrophobic Teflon are reported. The surface tension results indicate that cmc, surface tension after γcmc, and the minimum surface area per adsorbed HME-surfactant molecule Amin are all increased with n-value. Results of static light scattering are in agreements with those obtained using surface tension method. For HME-surfactants, strong adsorption measured by surface tension onto the hydrophilic synthetic clay mineral saponite. This result was also observed by atomic force microscopy AFM for HME9.7 onto hydrophilic mica surface. On the other hand, the adsorption of HME-surfactant onto hydrophobic polytetraflouroethylene PTFE (Teflon) is less than that measured onto saponite. However, the adsorption at both surfaces has the same dependency on n-value.

Kurzfassung

Die Oberflächenaktivität von neuen nichtionischen Hydroxyl-Mischether-Tensiden (HMEn) an Luft-/Wasser- und Festkörper-/Wasser-Grenzflächen wurde in Abhängigkeit des Ethoxylierungsgrades (n-Wert) untersucht und über die Eigenschaften dieser Serie nichtionischer Tenside, einschließlich Oberflächenspannung, kritischer Mizellbildungskonzentration (cmc) sowie Adsorption auf hydrophilem Saponit, Ton und hydrophobem Teflon berichtet. Die Ergebnisse der Messungen der Oberflächenspannung zeigen, dass die cmc, die Oberflächenspannung nach γcmc und die Minimumoberfläche pro absorbiertem HME-Tensidmolekül (Amin) mit dem n-Wert ansteigen. Die Ergebnisse der statischen Lichtstreuung sind mit denen in Übereinstimmung, die man mittels der Oberflächenspannungsmethoden erhält. Für die HME-Tenside wird auf dem hydrophilen synthetischen Tonmineral Saponit eine starke Adsorption bei der Oberflächenspannung gemessen. Dieses Ergebnis wurde ebenso beim Rasterkraftmikroskop (AFM) für HME9.7 auf der hydrophilen Oberfläche von Glimmererde beobachtet. Andererseits ist die Adsorption von HME-Tensid auf hydrophobem Polytetrafluorethylen PTFE (Teflon) geringer als die auf Soponit gemessene. Die Adsorption hat aber auf beiden Oberflächen die gleiche Abhängigkeit vom n-Wert.

Key words:: Adsorption; nonionic surfactants; saponite; clay; hydroxy mixed ether
Stichwörter:: Adsorption; nichtionische Tenside; Saponit; Ton; Hydroxyl-Mischether
∗ Dr. Rami Abdel-Rahem, King Faisal University, Al-Ahsa Teachers College, Department of Science, Section of Chemistry, Qatar street, P.O. Box 2313, Al Hafouf 31982, Kingdom of Saudi Arabia. E.mail:

Rami Abdel-Rahem is an Assistant Professor of Physical Chemistry at the University of King Fiasal, College of Teachers (Kingdom of Saudi Arabia). He graduated in Physical Chemistry from Jordan University of Science and Technology and received a PhD at the University of Bayreuth (Germany).

Ayman S. Ayesh is an Assistant Professor of Materials Science at the University of King Fiasal, College of Teachers (Kingdom of Saudi Arabia). He graduated in Polymer Physics from the Jordanian University and received a PhD at the University of Baghdad, (Iraq).

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Received: 2008-01-13
Published Online: 2013-04-02
Published in Print: 2008-05-01

© 2008, Carl Hanser Publisher, Munich

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https://doi.org/10.3139/113.100371
Keywords for this article
Adsorption; nonionic surfactants; saponite; clay; hydroxy mixed ether

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Detergent Ingredient
  6. Quantitative Determination of Tetraacetylethylenediamine in Laundry Powder by FTIR Spectrometry Using Partial Least Squares Algorithm
  7. Physical Chemistry
  8. Conductivity Measurements as a Method for Studying Ionic Technical Grade Surfactants
  9. Electrocatalytic Hydrogenation and Hydrogenolysis of Aromatic Halides by Raney Nickel in the Presence of Different Surfactants
  10. Phase Separation Study of a Surface-Active Drug, Promazine Hydrochloride, in Presence of Surfactants and Ureas
  11. Surface Activity of Newly Nonionic Surfactants at Air/Water Interface and their Interaction with Clay and Teflon
  12. Review Article
  13. 50 Years of Environmental Monitoring at Henkel
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