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Ethoxy Carboxylate Extended Surfactant: Surface Charge of Surfactant‐Modified Alumina, Adsolubilization and Solubilization of Phenylethanol and Styrene
Author(s) -
Arpornpong Noulkamol,
Lewlomphaisan Jirapat,
Charoensaeng Ampira,
Sabatini David A.,
Khaodhiar Sutha
Publication year - 2013
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-012-1394-4
Subject(s) - pulmonary surfactant , chemistry , zeta potential , carboxylate , adsorption , bilayer , surface charge , styrene , alkoxy group , inorganic chemistry , desorption , chemical engineering , organic chemistry , membrane , alkyl , copolymer , biochemistry , nanoparticle , engineering , polymer
Adsolubilization of contaminants by surfactant‐modified material is an important phenomenon for surfactant‐based environmental technologies. Recently, extended surfactants have been shown to enhance the adsolubilization capacity of organic solutes. In this study, two extended surfactants (ethoxy propoxylated carboxylate extended surfactant—C16PO4EO5C and propoxylate extended sulfate surfactant—C16PO4S) were selected for modifying positively charged alumina surfaces with the aim of enhancing adsolubilization of organic solutes with varying degrees of polarity (phenanthrene, styrene, and phenylethanol). The nature of the charged surface as a function of extended surfactant adsorption was evaluated through the zeta potential measurements. The results showed that at maximum bilayer coverage, the zeta potential of the alumina surface remained constant and was oppositely charged (negative) to the unmodified alumina (positive). Zeta potential measurements showed that the adsorbed bilayer of carboxylate‐based extended surfactant produced more negatively charged surface. Surfactant desorption results showed that the surfactant‐modified surface retained their negatively charge, albeit reduced, indicating that partial desorption occurred but not to the point that the positively charged alumina surface was realized. The adsolubilization results suggest a benefit of the ethoxy groups in adsolubilizing the polar phenylethanol in the palisade layer.