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Nguyen M, Shen K, Sherck N, Köhler S, Gupta R, Delaney KT, Shell MS, Fredrickson GH. A molecularly informed field-theoretic study of the complexation of polycation PDADMA with mixed micelles of sodium dodecyl sulfate and ethoxylated surfactants. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:75. [PMID: 37665423 DOI: 10.1140/epje/s10189-023-00332-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 08/11/2023] [Indexed: 09/05/2023]
Abstract
The self-assembly and phase separation of mixtures of polyelectrolytes and surfactants are important to a range of applications, from formulating personal care products to drug encapsulation. In contrast to systems of oppositely charged polyelectrolytes, in polyelectrolyte-surfactant systems the surfactants micellize into structures that are highly responsive to solution conditions. In this work, we examine how the morphology of micelles and degree of polyelectrolyte adsorption dynamically change upon varying the mixing ratio of charged and neutral surfactants. Specifically, we consider a solution of the cationic polyelectrolyte polydiallyldimethylammonium, anionic surfactant sodium dodecyl sulfate, neutral ethoxylated surfactants (C[Formula: see text]EO[Formula: see text]), sodium chloride salt, and water. To capture the chemical specificity of these species, we leverage recent developments in constructing molecularly informed field theories via coarse-graining from all-atom simulations. Our results show how changing the surfactant mixing ratios and the identity of the nonionic surfactant modulates micelle size and surface charge, and as a result dictates the degree of polyelectrolyte adsorption. These results are in semi-quantitative agreement with experimental observations on the same system.
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Affiliation(s)
- My Nguyen
- Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA
| | - Kevin Shen
- Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA
- Materials Research Laboratory, University of California, Santa Barbara, CA, 93106, USA
| | | | | | - Rohini Gupta
- California Research Alliance (CARA) by BASF, Berkeley, CA, 94720, USA
| | - Kris T Delaney
- Materials Research Laboratory, University of California, Santa Barbara, CA, 93106, USA
| | - M Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA.
| | - Glenn H Fredrickson
- Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA.
- Materials Research Laboratory, University of California, Santa Barbara, CA, 93106, USA.
- Department of Materials, University of California, Santa Barbara, CA, 93106, USA.
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2
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Blagodatskikh IV, Vyshivannaya OV, Bezrodnykh EA, Tikhonov VE, Orlov VN, Shabelnikova YL, Khokhlov AR. Peculiarities of the interaction of sodium dodecyl sulfate with chitosan in acidic and alkaline media. Int J Biol Macromol 2022; 214:192-202. [PMID: 35709870 DOI: 10.1016/j.ijbiomac.2022.06.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/25/2022] [Accepted: 06/10/2022] [Indexed: 11/05/2022]
Abstract
In this work, the interaction between the negatively charged surfactant sodium dodecyl sulfate (SDS) and partially N-reacetylated chitosan (RA-CHI), which is soluble at pH range up to pH 12, is studied in a wide pH range including alkaline media by light scattering (LS) and isothermic titration calorimetry (ITC). It is shown that in the weakly alkaline medium (pH 7.4), RA-CHI/SDS interaction is exothermic and cooperative. This interaction is found to be coupled with proton transfer from the buffer substance to chitosan as it is revealed by the dependence of the measured heat release on the ionization enthalpy of the buffer. At higher pH values (pH > 8), another mechanism of interaction is observed that include SDS micellization induced by hydrophobic interactions with polymer segments, so that no phase separation occurred in these mixtures. The results obtained can contribute to expand the knowledge about application of chitosan for preparation of pharmaceutical and cosmetic compositions containing anionic surfactants.
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Affiliation(s)
- Inesa V Blagodatskikh
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow 119991, Russia.
| | - Oxana V Vyshivannaya
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow 119991, Russia
| | - Evgeniya A Bezrodnykh
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow 119991, Russia
| | - Vladimir E Tikhonov
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow 119991, Russia
| | - Victor N Orlov
- A. N. Belozersky Research Institute of Physico-Chemical Biology MSU, Leninskie Gory, 1-40, Moscow 119992, Russia
| | - Yana L Shabelnikova
- Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Academician Osipyan St. 6, 142432 Chernogolovka, Moscow Region, Russia
| | - Alexey R Khokhlov
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow 119991, Russia; Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
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3
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Madinya JJ, Sing CE. Hybrid Field Theory and Particle Simulation Model of Polyelectrolyte–Surfactant Coacervation. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jason J. Madinya
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, 600 S. Matthews Ave., Urbana, Illinois 61820, United States
| | - Charles E. Sing
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, 600 S. Matthews Ave., Urbana, Illinois 61820, United States
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Interactions between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation. Polymers (Basel) 2021; 13:polym13111729. [PMID: 34070596 PMCID: PMC8197838 DOI: 10.3390/polym13111729] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 05/21/2021] [Accepted: 05/22/2021] [Indexed: 11/30/2022] Open
Abstract
The study of interactions between polyelectrolytes (PE) and surfactants is of great interest for both fundamental and applied research. These mixtures can represent, for example, models of self-assembly and molecular organization in biological systems, but they are also relevant in industrial applications. Amphiphilic block polyelectrolytes represent an interesting class of PE, but their interactions with surfactants have not been extensively explored so far, most studies being restricted to non-associating PE. In this work, interactions between an anionic amphiphilic triblock polyelectrolyte and different types of surfactants bearing respectively negative, positive and no charge, are investigated via surface tension and solution rheology measurements for the first time. It is evidenced that the surfactants have different effects on viscosity and surface tension, depending on their charge type. Micellization of the surfactant is affected by the presence of the polymer in all cases; shear viscosity of polymer solutions decreases in presence of the same charge or nonionic surfactants, while the opposite charge surfactant causes precipitation. This study highlights the importance of the charge type, and the role of the associating hydrophobic block in the PE structure, on the solution behavior of the mixtures. Moreover, a possible interaction model is proposed, based on the obtained data.
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Queirós MVA, Loh W. From Associative to Segregative Phase Separation: The Phase Behavior of Poly(acrylate)/Dodecyltrimethylammonium Complex Salts in the Presence of NaBr and NaCl. J Phys Chem B 2021; 125:2968-2975. [PMID: 33720730 DOI: 10.1021/acs.jpcb.0c11245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report here a systematic study on the phase behavior of dodecyltrimethylammonium-poly(acrylate) (C12TAPA) complex salts upon addition of simple salts (NaBr and NaCl). Complex salts of poly(acrylate) of two molar masses were employed (2000 and 450,000 g mol-1). Systems containing different surfactant mesophases were observed, whose structures were elucidated by small-angle X-ray scattering analyses. Overall, we observe a transition from associative to segregative phase separation intercalated with monophasic regions. In terms of surfactant association, a transition from micellar cubic phases to an isotropic micellar solution was observed, where these two phases occur in equilibrium with a dilute phase as a consequence of associative phase separation. However, as the salt concentration increases, segregative phase separation is observed, and scattering analyses of the surfactant-rich phase indicate the growth of micellar aggregates. These results are discussed in terms of the electrolyte effect screening the interactions between the oppositely charged surfactant and polymer and as a result of salting-out effects of the different electrolytes that prevail at higher concentrations.
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Affiliation(s)
| | - Watson Loh
- Institute of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
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Adsorption of Mixtures of a Pegylated Lipid with Anionic and Zwitterionic Surfactants at Solid/Liquid. COLLOIDS AND INTERFACES 2020. [DOI: 10.3390/colloids4040047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This work explores the association of a pegylated lipid (DSPE-PEG) with different anionic and zwitterionic surfactants (pseudo-binary and pseudo-ternary polymer+ surfactant mixtures), and the adsorption of the polymer + surfactant aggregates onto negatively charged surfaces, with a surface charge density similar to that existing on the damaged hair epicuticle. Dynamic light scattering and zeta potential measurements shows that, in solution, the polymer + surfactant association results from an intricate balance between electrostatic and hydrophobic interactions, which leads to the formation of at least two different types of micellar-like polymer + surfactant aggregates. The structure and physicochemical properties of such aggregates were found strongly dependent on the specific nature and concentration of the surfactant. The adsorption of the polymer + surfactant aggregates onto negatively charged surface was studied using a set of surface-sensitive techniques (quartz crystal microbalance with dissipation monitoring, ellipsometry and Atomic Force Microscopy), which allows obtaining information about the adsorbed amount, the water content of the layers and the topography of the obtained films. Ion-dipole interactions between the negative charges of the surface and the oxyethylene groups of the polymer + surfactant aggregates appear as the main driving force of the deposition process. This is strongly dependent on the surfactant nature and its concentration, with the impact of the latter on the adsorption being especially critical when anionic surfactant are incorporated within the aggregates. This study opens important perspectives for modulating the deposition of a poorly interacting polymer onto negatively charged surfaces, which can impact in the fabrication on different aspects with technological and industrial interest.
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Guzmán E, Fernández-Peña L, Ortega F, Rubio RG. Equilibrium and kinetically trapped aggregates in polyelectrolyte–oppositely charged surfactant mixtures. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Fernández-Peña L, Abelenda-Nuñez I, Hernández-Rivas M, Ortega F, Rubio RG, Guzmán E. Impact of the bulk aggregation on the adsorption of oppositely charged polyelectrolyte-surfactant mixtures onto solid surfaces. Adv Colloid Interface Sci 2020; 282:102203. [PMID: 32629241 DOI: 10.1016/j.cis.2020.102203] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 06/21/2020] [Accepted: 06/22/2020] [Indexed: 12/28/2022]
Abstract
The understanding of the deposition of oppositely charged polyelectrolytes-surfactant mixtures onto solid surfaces presents a high interest in current days due to the recognized impact of the obtained layers on different industrial sectors and the performance of several consumer products (e.g. formulations of shampoos and hair conditioners). This results from the broad range of structures and properties that can present the mixed layers, which in most of the cases mirror the association process occurring between the polyelectrolyte chains and the oppositely charged surfactants in the bulk. Therefore, the understanding of the adsorption processes and characteristics of the adsorbed layers can be only attained from a careful examination of the self-assembly processes occurring in the solution. This review aims to contribute to the understanding of the interaction of polyelectrolyte-surfactant mixtures with solid surfaces, which is probably one of the most underexplored aspects of these type of systems. For this purpose, a comprehensive discussion on the correlations between the aggregates formed in the solutions and the deposition of the obtained complexes upon such association onto solid surfaces will be presented. This makes it necessary to take a closer look to the most important forces driving such processes.
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Affiliation(s)
- Laura Fernández-Peña
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain; Centro de Espectroscopia Infrarroja-Raman-Correlación, Universidad Complutense de Madrid, Ciudad Universitaria, s/n, Madrid 28040, Spain.
| | - Irene Abelenda-Nuñez
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain
| | - María Hernández-Rivas
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain
| | - Francisco Ortega
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain; Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII 1, Madrid 28040, Spain
| | - Ramón G Rubio
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain; Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII 1, Madrid 28040, Spain
| | - Eduardo Guzmán
- Departamento de Química Física, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain; Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII 1, Madrid 28040, Spain.
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Guzmán E, Fernández-Peña L, S. Luengo G, Rubio AM, Rey A, Léonforte F. Self-Consistent Mean Field Calculations of Polyelectrolyte-Surfactant Mixtures in Solution and upon Adsorption onto Negatively Charged Surfaces. Polymers (Basel) 2020; 12:E624. [PMID: 32182867 PMCID: PMC7182847 DOI: 10.3390/polym12030624] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 03/07/2020] [Accepted: 03/08/2020] [Indexed: 01/18/2023] Open
Abstract
Self-Consistent Mean-Field Calculations (SCF) have provided a semi-quantitative description of the physico-chemical behavior of six different polyelectrolyte-surfactant mixtures. The SCF calculations performed showed that both the formation of polymer-surfactant in bulk and the adsorption of the formed complexes onto negatively-charged surfaces are strongly affected by the specific nature of the considered systems, with the polymer-surfactant interactions playing a central role in the self-assembly of the complexes that, in turn, affects their adsorption onto interfaces and surfaces. This work evidences that SCF calculations are a valuable tool for deepening on the understanding of the complex physico-chemical behavior of polyelectrolyte-surfactant mixtures. However, it is worth noting that the framework obtained on the basis of an SCF approach considered an equilibrium situation which may, in some cases, be far from the real situation appearing in polyelectrolyte-surfactant systems.
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Affiliation(s)
- Eduardo Guzmán
- Departamento de Química Física, Universidad Complutense de Madrid, 28040 Madrid, Spain; (L.F.-P.); (A.M.R.); (A.R.)
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Laura Fernández-Peña
- Departamento de Química Física, Universidad Complutense de Madrid, 28040 Madrid, Spain; (L.F.-P.); (A.M.R.); (A.R.)
| | | | - Ana María Rubio
- Departamento de Química Física, Universidad Complutense de Madrid, 28040 Madrid, Spain; (L.F.-P.); (A.M.R.); (A.R.)
| | - Antonio Rey
- Departamento de Química Física, Universidad Complutense de Madrid, 28040 Madrid, Spain; (L.F.-P.); (A.M.R.); (A.R.)
| | - Fabien Léonforte
- L’Oréal Research and Innovation, 93600 Aulnay-Sous Bois, France;
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Liu X, Yu Q, Song A, Dong S, Hao J. Progress in nuclear magnetic resonance studies of surfactant systems. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2019.10.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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11
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Guzmán E, Llamas S, Fernández-Peña L, Léonforte F, Baghdadli N, Cazeneuve C, Ortega F, Rubio RG, Luengo GS. Effect of a natural amphoteric surfactant in the bulk and adsorption behavior of polyelectrolyte-surfactant mixtures. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124178] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bali K, Dúzs B, Sáfrán G, Pécz B, Mészáros R. Effect of Added Surfactant on Poly(Ethylenimine)-Assisted Gold Nanoparticle Formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14007-14016. [PMID: 31589455 DOI: 10.1021/acs.langmuir.9b03055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In a variety of applications, functionalization of gold nanoparticles is needed to ensure adequate surface charge and hydrophobicity for their biodistribution, interparticle interactions, or self-organization. In the present paper, we provide an economic way for the synthesis of hydrophobized poly(ethylenimine) (PEI) capped gold nanoparticles at room temperature using sodium dodecyl sulfate (SDS). The approach is based on the controlled competition between the nucleation of gold nanophases within the PEI molecules and the SDS binding onto their amine groups. This can be achieved via utilizing the strongly irreversible nature of the association between the oppositely charged polymer and that of the surfactant molecules. Specifically, by varying the order and timing of SDS addition during the process of gold nanoassembly formation, the size distribution, the morphology, and the local hydrophobic environment of the produced Au-PEI/SDS nanohybrids can be tuned even at one composition of the system. The results may be further exploited for the preparation of noble metal nanoassemblies with controlled hydrophobicity and charge.
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Affiliation(s)
- Krisztina Bali
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry , ELTE Eötvös Loránd University , H-1117 Budapest , Pázmány Péter sétány 1/A , Hungary
| | - Brigitta Dúzs
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry , ELTE Eötvös Loránd University , H-1117 Budapest , Pázmány Péter sétány 1/A , Hungary
| | - György Sáfrán
- Institute of Technical Physics and Materials Sciences, Centre for Energy Research, H.A.S. , H-1121 Budapest , Konkoly Thege M. út 29-33 , Hungary
| | - Béla Pécz
- Institute of Technical Physics and Materials Sciences, Centre for Energy Research, H.A.S. , H-1121 Budapest , Konkoly Thege M. út 29-33 , Hungary
| | - Róbert Mészáros
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry , ELTE Eötvös Loránd University , H-1117 Budapest , Pázmány Péter sétány 1/A , Hungary
- Department of Chemistry , University J. Selyeho , 945 01 Komárno , Slovakia
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Akanno A, Guzmán E, Fernández-Peña L, Ortega F, G Rubio R. Surfactant-Like Behavior for the Adsorption of Mixtures of a Polycation and Two Different Zwitterionic Surfactants at the Water/Vapor Interface. Molecules 2019; 24:molecules24193442. [PMID: 31547491 PMCID: PMC6804224 DOI: 10.3390/molecules24193442] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 09/18/2019] [Accepted: 09/19/2019] [Indexed: 01/19/2023] Open
Abstract
The bulk and interfacial properties of solutions formed by a polycation (i.e., poly(diallyl-dimethylammonium chloride), PDADMAC) and two different zwitterionic surfactants (i.e., coco-betaine (CB) and cocoamidopropyl-betaine (CAPB)) have been studied. The bulk aggregation of the polyelectrolyte and the two surfactants was analyzed by turbidity and electrophoretic mobility measurements, and the adsorption of the solutions at the fluid interface was studied by surface tension and interfacial dilational rheology measurements. Evidence of polymer-surfactant complex formation in bulk was only found when the number of surfactant molecules was closer to the number of charged monomers in solutions, which suggests that the electrostatic repulsion associated with the presence of a positively charged group in the surfactant hinders the association between PDADMAC and the zwitterionic surfactant for concentrations in which there are no micelles in solution. This lack of interaction in bulk is reflected in the absence of an influence of the polyelectrolyte in the interfacial properties of the mixtures, with the behavior being controlled by the presence of surfactant. This work has evidenced the significant importance of the different interactions involved in the system for controlling the interaction and complexation mechanisms of in polyelectrolyte-surfactant mixtures.
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Affiliation(s)
- Andrew Akanno
- Departamento de Química Física, Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040-Madrid, Spain.
- Instituto Pluridisciplina, Universidad Complutense de Madrid, Paseo Juan XXIII 1, 28040-Madrid, Spain.
| | - Eduardo Guzmán
- Departamento de Química Física, Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040-Madrid, Spain.
- Instituto Pluridisciplina, Universidad Complutense de Madrid, Paseo Juan XXIII 1, 28040-Madrid, Spain.
| | - Laura Fernández-Peña
- Departamento de Química Física, Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040-Madrid, Spain.
| | - Francisco Ortega
- Departamento de Química Física, Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040-Madrid, Spain.
- Instituto Pluridisciplina, Universidad Complutense de Madrid, Paseo Juan XXIII 1, 28040-Madrid, Spain.
| | - Ramón G Rubio
- Departamento de Química Física, Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040-Madrid, Spain.
- Instituto Pluridisciplina, Universidad Complutense de Madrid, Paseo Juan XXIII 1, 28040-Madrid, Spain.
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14
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Bali K, Varga Z, Kardos A, Mészáros R. Impact of local inhomogeneities on the complexation between poly(diallyldimethylammoniumchloride) and sodium dodecyl sulfate. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Schulze-Zachau F, Braunschweig B. C nTAB/polystyrene sulfonate mixtures at air-water interfaces: effects of alkyl chain length on surface activity and charging state. Phys Chem Chem Phys 2019; 21:7847-7856. [PMID: 30916092 DOI: 10.1039/c9cp01107b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Binding and phase behavior of oppositely charged polyelectrolytes and surfactants with different chain lengths were studied in aqueous bulk solutions and at air-water interfaces. In particular, we have investigated the polyanion poly(sodium 4-styrenesulfonate) (NaPSS) and the cationic surfactants dodecyltrimethylammonium bromide (C12TAB), tetradecyltrimethylammonium bromide (C14TAB) and cetyltrimethylammonium bromide (C16TAB). In order to reveal the surfactant/polyelectrolyte binding, aggregation and phase separation of the mixtures, we have varied the NaPSS concentration systematically and have kept the surfactant concentration fixed at 1/6 of the respective critical micelle concentration. Information on the behavior in the bulk solution was gained by electrophoretic mobility and turbidity measurements, while the surface properties were studied using surface tension measurements and vibrational sum-frequency generation (SFG). This has enabled us to relate bulk to interfacial properties with respect to the charging state and the surfactants' binding efficiency. We found that the latter two are strongly dependent on the alkyl chain length of the surfactant and that binding is much more efficient as the alkyl chain length of the surfactant increases. This also results in a different phase behavior as shown by turbidity measurements of the bulk solutions. Charge neutral aggregates that are forming in the bulk adsorb onto the air-water interface - an effect that is likely caused by the increased hydrophobicity of CnTAB/PSS complexes. This conclusion is corroborated by SFG spectroscopy, where we observe a decrease in the intensity of O-H stretching bands, which is indicative of a decrease in surface charging and the formation of interfaces with negligible net charge. Particularly at mixing ratios that are in the equilibrium two-phase region, we observe weak O-H intensities and thus surface charging.
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Affiliation(s)
- Felix Schulze-Zachau
- Institute of Physical Chemistry and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster, Germany.
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