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Colloids and Interfaces
Volume 5
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10.3390/colloids5030037
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Article

A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes

by
Hernán Martinelli
1,
Claudia Domínguez
1,
Marcos Fernández Leyes
1,
Sergio Moya
2 and
Hernán Ritacco
1,*
1
Instituto de Física del Sur (IFISUR-CONICET), Av. Alem 1253, Bahía Blanca 8000, Argentina
2
CIC biomaGUNE, Paseo de Miramón 182, 20014 Donostia-San Sebastián, Spain
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2021, 5(3), 37; https://doi.org/10.3390/colloids5030037
Submission received: 14 June 2021 / Revised: 8 July 2021 / Accepted: 13 July 2021 / Published: 19 July 2021
(This article belongs to the Special Issue Interfacial Phenomena)
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Abstract

In the search for responsive complexes with potential applications in the formulation of smart dispersed systems such as foams, we hypothesized that a pH-responsive system could be formulated with polyacrylic acid (PAA) mixed with a cationic surfactant, Gemini 12-2-12 (G12). We studied PAA-G12 complexes at liquid–air interfaces by equilibrium and dynamic surface tension, surface rheology, and X-ray reflectometry (XRR). We found that complexes adsorb at the interfaces synergistically, lowering the equilibrium surface tension at surfactant concentrations well below the critical micelle concentration (cmc) of the surfactant. We studied the stability of foams formulated with the complexes as a function of pH. The foams respond reversibly to pH changes: at pH 3.5, they are very stable; at pH > 6, the complexes do not form foams at all. The data presented here demonstrate that foam formation and its pH responsiveness are due to interfacial dynamics.
Keywords: polymer-surfactant complexes; surface tension; X-ray reflectometry; smart foams; responsive complexes; nanomedicine polymer-surfactant complexes; surface tension; X-ray reflectometry; smart foams; responsive complexes; nanomedicine

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MDPI and ACS Style

Martinelli, H.; Domínguez, C.; Leyes, M.F.; Moya, S.; Ritacco, H. A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes. Colloids Interfaces 2021, 5, 37. https://doi.org/10.3390/colloids5030037

AMA Style

Martinelli H, Domínguez C, Leyes MF, Moya S, Ritacco H. A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes. Colloids and Interfaces. 2021; 5(3):37. https://doi.org/10.3390/colloids5030037

Chicago/Turabian Style

Martinelli, Hernán, Claudia Domínguez, Marcos Fernández Leyes, Sergio Moya, and Hernán Ritacco. 2021. "A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes" Colloids and Interfaces 5, no. 3: 37. https://doi.org/10.3390/colloids5030037

APA Style

Martinelli, H., Domínguez, C., Leyes, M. F., Moya, S., & Ritacco, H. (2021). A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes. Colloids and Interfaces, 5(3), 37. https://doi.org/10.3390/colloids5030037

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