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Reduction of surface hydrophobicity using a stimulus-responsive polysaccharide.

Iliana G Sedeva¹, Daniel Fornasiero, John Ralston

¹Ian Wark Research Institute, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 22, 2010

Summary

Carboxymethyl cellulose (CMC) adsorption on hydrophobic surfaces is influenced by ionic strength and pH. Changes in these conditions alter CMC hydration and surface hydrophobicity reversibly, impacting its effectiveness.

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Area of Science:

Surface Science
Polymer Chemistry
Materials Science

Background:

Carboxymethyl cellulose (CMC) is a widely used biopolymer with applications in various industries.
Understanding CMC adsorption behavior on different surfaces is crucial for optimizing its performance.
Hydrophobic surfaces present unique challenges and opportunities for polymer adsorption studies.

Purpose of the Study:

To characterize the adsorption of CMC onto a hydrophobic self-assembled monolayer.
To investigate the influence of solution conditions (ionic strength and pH) on CMC adsorption.
To examine the response of adsorbed CMC layers to changes in solution conditions and their effect on surface properties.

Main Methods:

Quartz Crystal Microbalance with Dissipation Monitoring (QCM-D) was used to quantify CMC adsorption and hydration.
Captive bubble contact angle measurements assessed the surface hydrophobicity.
Adsorption and surface property changes were studied under varying ionic strength (10(-2) M to 10(-1) M KCl) and pH (9 to 3).

Main Results:

CMC adsorption increased with higher ionic strength and lower pH.
Switches in solution conditions induced reversible release of hydration water from the adsorbed CMC layer.
Lowering pH caused more significant changes in hydration and conformation than increasing ionic strength.
Adsorbed CMC reduced surface hydrophobicity, with enhanced effects at low pH and high ionic strength.
Switches in solution conditions further enhanced CMC's ability to reduce surface hydrophobicity, reversibly.

Conclusions:

Solution conditions significantly control CMC adsorption, hydration, and conformational changes on hydrophobic surfaces.
CMC's ability to modify surface hydrophobicity is tunable by adjusting ionic strength and pH.
The observed hydration and hydrophobicity changes are reversible, suggesting potential for responsive material applications.