1
|
Kuzminskaya O, Hoffmann I, Clemens D, Gradzielski M. Viscosity of Polyelectrolyte Surfactant Complexes—The Importance of the Choice of the Polyelectrolyte Seen for the Case of PDADMAC Versus JR 400. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00327] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga Kuzminskaya
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | | | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC 7, D-10623 Berlin, Germany
| |
Collapse
|
2
|
Determination of SLES in Personal Care Products by Colloid Titration with Light Reflection Measurements. Molecules 2021; 26:molecules26092716. [PMID: 34063161 PMCID: PMC8124727 DOI: 10.3390/molecules26092716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 04/30/2021] [Accepted: 05/02/2021] [Indexed: 11/16/2022] Open
Abstract
The method of colloid titration with poly(diallyldimethylammonium) chloride has been improved to detect the endpoint with an off-vessel light reflectance sensor. The digital color sensor used measures light reflectance by means of light guides, with no immersion into the reaction solution. In such a method, the optical signal is free of disturbances caused by sticky flocs in the solution. The improved automatic titration set was applied for the determination of sodium laureth sulfate (SLES) in industrial batches and commercial personal care products. The sample color and opacity do not disturb the SLES quantification. When the SLES content lies in the range from 5% to 9%, the optimal sample weight is from 6 g to 3 g.
Collapse
|
3
|
Patel L, Mansour O, Bryant H, Abdullahi W, Dalgliesh RM, Griffiths PC. Interaction of Low Molecular Weight Poly(diallyldimethylammonium chloride) and Sodium Dodecyl Sulfate in Low Surfactant-Polyelectrolyte Ratio, Salt-Free Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8815-8825. [PMID: 32668905 DOI: 10.1021/acs.langmuir.0c01149] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Coacervation is widely used in formulations to induce a beneficial character to the formulation, but nonequilibrium effects are often manifest. Electrophoretic NMR (eNMR), pulsed-gradient spin-echo NMR (PGSE-NMR), and small-angle neutron scattering (SANS) have been used to quantify the interaction between low molecular cationic poly(diallyldimethylammonium chloride) (PDADMAC) and the anionic surfactant sodium dodecyl sulfate (SDS) in aqueous solution as a model for the precursor state to such nonequilibrium processes. The NMR data show that, within the low surfactant concentration one-phase region, an increasing surfactant concentration leads to a reduction in the charge on the polymer and a collapse of its solution conformation, attaining minimum values coincident with the macroscopic phase separation boundary. Interpretation of the scattering data reveals how the rodlike polymer changes over the same surfactant concentration window, with no discernible fingerprint of micellar type aggregates, but rather with the emergence of disklike and lamellar structures. At the highest surfactant concentration, the emergence of a weak Bragg peak in both the polymer and surfactant scattering suggests these precursor disk and lamellar structures evolve into paracrystalline stacks which ultimately phase separate. Addition of the nonionic surfactant hexa(ethylene glycol) monododecyl ether (C12E6) to the system seems to have little effect on the PDADMAC/SDS interaction as determined by NMR, merely displacing the observed behavior to lower SDS concentrations, commensurate with the total SDS present in the system. In other words, PDADMAC causes the disruption of the mixed SDS/C12E6 micelle, leading to SDS-rich PDADAMC/surfactant complexes coexisting with C12E6-rich micelles in solution.
Collapse
Affiliation(s)
- Leesa Patel
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Omar Mansour
- Faculty of Health and Life Sciences, Leicester School of Pharmacy, De Montfort University, The Gateway, Leicester, LE1 9BH, U.K
| | - Hannah Bryant
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Wasiu Abdullahi
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Robert M Dalgliesh
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, U.K
| | - Peter C Griffiths
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| |
Collapse
|
4
|
Introduction of a nonionic sugar-based surfactant to an oppositely charged hydrophobically modified polyelectrolyte and surfactant binary system. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
5
|
Brinatti C, Akhlaghi SP, Pires-Oliveira R, Bernardinelli OD, Berry RM, Tam KC, Loh W. Controlled coagulation and redispersion of thermoresponsive poly di(ethylene oxide) methyl ether methacrylate grafted cellulose nanocrystals. J Colloid Interface Sci 2019; 538:51-61. [DOI: 10.1016/j.jcis.2018.11.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 11/15/2018] [Accepted: 11/16/2018] [Indexed: 12/01/2022]
|
6
|
Effects of nonionic surfactant and salts on the interactions between oppositely charged star-shaped copolymer and ionic surfactant in aqueous solutions. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
7
|
Gradzielski M, Hoffmann I. Polyelectrolyte-surfactant complexes (PESCs) composed of oppositely charged components. Curr Opin Colloid Interface Sci 2018. [DOI: 10.1016/j.cocis.2018.01.017] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
8
|
Ferreira GA, Loh W. Liquid crystalline nanoparticles formed by oppositely charged surfactant-polyelectrolyte complexes. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.08.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
Chiappisi L, David Leach S, Gradzielski M. Precipitating polyelectrolyte-surfactant systems by admixing a nonionic surfactant - a case of cononsurfactancy. SOFT MATTER 2017; 13:4988-4996. [PMID: 28676872 DOI: 10.1039/c7sm00747g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The formation of water insoluble polyelectrolyte/surfactant complexes (PESCs) upon mixing two homogeneous polycation/anionic surfactant and polycation/nonionic surfactant solutions is reported here. This phase separation is unexpected and differs markedly from the commonly observed enhanced solubility of colloidal systems in mixed surfactant systems. The study was performed on mixtures of the cationic biopolysaccharide chitosan (poly d-glucosamine) and mixed micelles composed of an ethoxylated fatty alcohol and its carboxylic acid terminated equivalent. The thermodynamics of mixing was probed via isothermal titration calorimetry (ITC), while the structural characterisation was conducted by means of light and neutron scattering (SANS). The results show that the substitution of a weakly anionic surfactant with its nonionic equivalent has profound effects on the interactions at very different length scales. The dilution of the ionic headgroups allows for a more efficient interaction between micelles and polymer chains, and results in an elongation of the mixed micelles which reduces the bending cost of the semi-rigid chitosan and introduces an additional attractive potential of entropic origin. In this work, as a result of a comprehensive thermodynamic and structural analysis, we demonstrate how the subtle interplay of different forces leads to such an unexpected behaviour, where the addition of a nonionic surfactant causes the phase separation of electrostatic complexes.
Collapse
Affiliation(s)
- Leonardo Chiappisi
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany. and Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Stephen David Leach
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany.
| | - Michael Gradzielski
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany.
| |
Collapse
|
10
|
Fan Y, Kellermeier M, Xu AY, Boyko V, Mirtschin S, Dubin PL. Modulation of Polyelectrolyte–Micelle Interactions via Zeta Potentials. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00584] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yaxun Fan
- Department
of Chemistry, University of Massachusetts at Amherst, Amherst, Massachusetts 01003, United States
- Key
Laboratory of Colloid and Interface Science, Beijing National Laboratory
for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Matthias Kellermeier
- Advanced
Materials and Systems Research, BASF SE, Carl-Bosch-Str. 38, D-67056 Ludwigshafen, Germany
| | - Amy Y. Xu
- Department
of Chemistry, University of Massachusetts at Amherst, Amherst, Massachusetts 01003, United States
| | - Volodymyr Boyko
- Advanced
Materials and Systems Research, BASF SE, Carl-Bosch-Str. 38, D-67056 Ludwigshafen, Germany
| | - Sebastian Mirtschin
- Advanced
Materials and Systems Research, BASF SE, Carl-Bosch-Str. 38, D-67056 Ludwigshafen, Germany
| | - Paul L. Dubin
- Department
of Chemistry, University of Massachusetts at Amherst, Amherst, Massachusetts 01003, United States
| |
Collapse
|
11
|
Bodnár K, Szarka K, Nagy M, Mészáros R. Effect of the Charge Regulation Behavior of Polyelectrolytes on Their Nonequilibrium Complexation with Oppositely Charged Surfactants. J Phys Chem B 2016; 120:12720-12729. [DOI: 10.1021/acs.jpcb.6b09397] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katalin Bodnár
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
| | - Katarina Szarka
- Department
of Chemistry, University J. Selyeho, 945 01 Komárno, Slovakia
| | - Miklós Nagy
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
| | - Róbert Mészáros
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter
sétány 1/A, 1117 Budapest, Hungary
- Department
of Chemistry, University J. Selyeho, 945 01 Komárno, Slovakia
| |
Collapse
|
12
|
Chen G, Li Z, Chen L, Ji S, Shen W. Synthesis and Properties of Alkyl β-d-Galactopyranoside. J SURFACTANTS DETERG 2016. [DOI: 10.1007/s11743-016-1865-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
13
|
Li HM, Chen YW, Zhu YJ, Tong CH. Numerical study of the interplay of monomer-surface electrostatic and non-electrostatic interactions in the adsorption of weak polyelectrolytes on oppositely charged surfaces. CHINESE JOURNAL OF POLYMER SCIENCE 2016. [DOI: 10.1007/s10118-016-1780-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
14
|
Bodnár K, Fegyver E, Nagy M, Mészáros R. Impact of Polyelectrolyte Chemistry on the Thermodynamic Stability of Oppositely Charged Macromolecule/Surfactant Mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1259-68. [PMID: 26780183 DOI: 10.1021/acs.langmuir.5b04431] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The complexation between hexadecyl- and dodecyltrimethylammonium bromides (CTAB and DTAB) with sodium poly[(vinyl alcohol)-co-(vinyl sulfate)] (PVAS) copolymer of low charge density has been investigated using pyrene fluorescence spectroscopy, electrophoretic mobility, turbidity, and dynamic light scattering measurements. The results indicate that the binding of the cationic surfactant occurs in three steps. At low surfactant concentrations, the cationic amphiphile binds to the vinyl sulfate groups. Above charge neutralization, surfactant binding may occur on the surface of the hydrophobic vinyl sulfate/CnTAB nanoassemblies. At even higher concentrations, the surfactant binds on the nonionic vinyl alcohol units of the polyion which reswells the PVAS/CnTAB complexes and makes them highly soluble in water. In earlier studies on oppositely charged ionic surfactants and homopolyelectrolytes the impact of mixing protocols was found remarkable, especially at surfactant excess, where these systems can be trapped in the charge stabilized colloidal dispersion state. In contrast, in the case of PVAS/CnTAB mixtures the effect of mixing is less pronounced and diminishes with increasing ionic strength or decreasing alkyl chain length of the surfactant. These findings are rationalized by taking into account the different binding mechanism of surfactants on oppositely charged homopolyelectrolytes and double hydrophilic copolymers.
Collapse
Affiliation(s)
- Katalin Bodnár
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University , 1117 Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Edit Fegyver
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University , 1117 Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Miklós Nagy
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University , 1117 Budapest, Pázmány Péter sétány 1/A, Hungary
| | - Róbert Mészáros
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University , 1117 Budapest, Pázmány Péter sétány 1/A, Hungary
- Department of Chemistry, University J. Selyeho , 945 01 Komárno, Slovakia
| |
Collapse
|
15
|
Brinatti C, Huang J, Berry RM, Tam KC, Loh W. Structural and Energetic Studies on the Interaction of Cationic Surfactants and Cellulose Nanocrystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:689-98. [PMID: 26731488 DOI: 10.1021/acs.langmuir.5b03893] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We report a comprehensive study on the interactions between cationic surfactant homologues CnTAB (n = 12, 14, and 16) with negatively charged cellulose nanocrystals (CNCs). By combining different techniques, such as isothermal titration calorimetry (ITC), surface tension, light scattering, electrophoretic mobility, and fluorescence anisotropy measurements, we identified two different driving forces for the formation of surface induced micellar aggregates. For the C12TAB surfactant, a surfactant monolayer with the alkyl chains exposed to the water is formed via electrostatic interactions at low concentration. At a higher surfactant concentration, micellar aggregates are formed at the CNC surface. For the C14TAB and C16TAB systems, micellar aggregates are formed at the CNC surface at a much lower surfactant concentration via electrostatic interactions, followed by hydrophobic interactions between the alkyl chains. At higher surfactant concentration, charge neutralization and association of the surfactant decorated CNC aggregates led to flocculation.
Collapse
Affiliation(s)
- César Brinatti
- Institute of Chemistry - Universidade Estadual de Campinas (UNICAMP) , CP 6154, CEP 13083-970, Campinas, SP Brazil
| | - John Huang
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology University of Waterloo , 200 University Avenue West, Ontario N2L 3G1, Canada
| | - Richard M Berry
- CelluForce Inc. , 625, Président-Kennedy Avenue, Montreal, Quebec H3A 1K2, Canada
| | - Kam C Tam
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology University of Waterloo , 200 University Avenue West, Ontario N2L 3G1, Canada
| | - Watson Loh
- Institute of Chemistry - Universidade Estadual de Campinas (UNICAMP) , CP 6154, CEP 13083-970, Campinas, SP Brazil
| |
Collapse
|
16
|
Tangso KJ, Patel H, Lindberg S, Hartley PG, Knott R, Spicer PT, Boyd BJ. Controlling the Mesostructure Formation within the Shell of Novel Cubic/Hexagonal Phase Cetyltrimethylammonium Bromide-Poly(acrylamide-acrylic acid) Capsules for pH Stimulated Release. ACS APPLIED MATERIALS & INTERFACES 2015; 7:24501-24509. [PMID: 26457761 DOI: 10.1021/acsami.5b05821] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The self-assembly of ordered structures in mixtures of oppositely charged surfactant and polymer systems has been exploited in various cleaning and pharmaceutical applications and continue to attract much interest since their discovery in the late twentieth century. The ability to control the electrostatic and hydrophobic interactions that dictate the formation of liquid crystalline phases in these systems is advantageous in manipulation of structure and rendering them responsive to external stimuli. Nanostructured capsules comprised of the cationic surfactant, cetyltrimethylammonium bromide (CTAB), and the diblock copolymer poly(acrylamide-acrylic acid) (PAAm-AA) were prepared to assess their potential as pH responsive nanomaterials. Crossed-polarizing light microscopy (CPLM) and small-angle X-ray scattering (SAXS) identified coexisting Pm3n cubic and hexagonal phases at the surfactant-polymer interface. The hydrophobic and electrostatic interactions between the oppositely charged components were studied by varying temperature and solution pH, respectively, and were found to influence the liquid crystalline nanostructure formed. The lattice parameter of the mesophases and the fraction of cubic phase in the system decreased upon heating. Acidic conditions resulted in the loss of the highly ordered structures due to protonation of the carboxylic acid group, and subsequent reduction of attractive forces previously present between the oppositely charged molecules. The rate of release of the model hydrophilic drug, Rhodamine B (RhB), from nanostructured macro-sized capsules significantly increased when the pH of the solution was adjusted from pH 7 to pH 2. This allowed for immediate release of the compound of interest "on demand", opening new options for structured materials with increased functionality over typical layer-by-layer capsules.
Collapse
Affiliation(s)
- Kristian J Tangso
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Hetika Patel
- School of Pharmacy, University College London , 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
| | - Seth Lindberg
- The Procter and Gamble Company , Corporate Engineering Technical Laboratories Building, Cincinnati, Ohio 45069, United States
| | - Patrick G Hartley
- Commonwealth Scientific and Industrial Research Organization , Bag 10, Clayton South, Victoria 3169, Australia
| | - Robert Knott
- Bragg Institute, Australian Nuclear Science and Technology Organization , Menai, New South Wales 2234, Australia
| | - Patrick T Spicer
- School of Chemical Engineering, University of New South Wales , Sydney, New South Wales 2052, Australia
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, Victoria 3052, Australia
| |
Collapse
|
17
|
Bračič M, Hansson P, Pérez L, Zemljič LF, Kogej K. Interaction of Sodium Hyaluronate with a Biocompatible Cationic Surfactant from Lysine: A Binding Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12043-12053. [PMID: 26474215 DOI: 10.1021/acs.langmuir.5b03548] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mixtures of natural and biodegradable surfactants and ionic polysaccharides have attracted considerable research interest in recent years because they prosper as antimicrobial materials for medical applications. In the present work, interactions between the lysine-derived biocompatible cationic surfactant N(ε)-myristoyl-lysine methyl ester, abbreviated as MKM, and the sodium salt of hyaluronic acid (NaHA) are investigated in aqueous media by potentiometric titrations using the surfactant-sensitive electrode and pyrene-based fluorescence spectroscopy. The critical micelle concentration in pure surfactant solutions and the critical association concentration in the presence of NaHA are determined based on their dependence on the added electrolyte (NaCl) concentration. The equilibrium between the protonated (charged) and deprotonated (neutral) forms of MKM is proposed to explain the anomalous binding isotherms observed in the presence of the polyelectrolyte. The explanation is supported by theoretical model calculations of the mixed-micelle equilibrium and the competitive binding of the two MKM forms to the surface of the electrode membrane. It is suggested that the presence of even small amounts of the deprotonated form can strongly influence the measured electrode response. Such ionic-nonionic surfactant mixtures are a special case of mixed surfactant systems where the amount of the nonionic component cannot be varied independently as was the case for some of the earlier studies.
Collapse
Affiliation(s)
- Matej Bračič
- Institute for the Engineering and Design of Materials, University of Maribor , Smetanova 17, 2000 Maribor, Slovenia
| | - Per Hansson
- Department of Pharmacy, Biomedical Centre, Uppsala University , SE-75123 Uppsala, Sweden
| | - Lourdes Pérez
- Department of Chemical and Surfactant Technology, Instituto de Química Avanzada de Cataluña, CSIC , Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Lidija F Zemljič
- Institute for the Engineering and Design of Materials, University of Maribor , Smetanova 17, 2000 Maribor, Slovenia
| | - Ksenija Kogej
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, 1000 Ljubljana, Slovenia
| |
Collapse
|
18
|
Plazzotta B, Fegyver E, Mészáros R, Pedersen JS. Anisometric Polyelectrolyte/Mixed Surfactant Nanoassemblies Formed by the Association of Poly(diallyldimethylammonium chloride) with Sodium Dodecyl Sulfate and Dodecyl Maltoside. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7242-7250. [PMID: 26057578 DOI: 10.1021/acs.langmuir.5b01280] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The soluble complexes of oppositely charged macromolecules and amphiphiles, formed in the one-phase concentration range, are usually described on the basis of the beads on a string model assuming spherelike bound surfactant micelles. However, around and above the charge neutralization ionic surfactant to polyion ratio, a variety of ordered structures of the precipitates and large polyion/surfactant aggregates have been reported for the different systems which are difficult to connect to globular-like surfactant self-assembly units. In this article we have demonstrated through SAXS measurements that the structure of precipitates and those of the soluble polyion/mixed surfactant complexes of poly(diallyldimethylammonium chloride) (PDADMAC), sodium dodecyl sulfate (SDS), and dodecyl-maltoside (DDM) are strongly correlated. Specifically, SDS binds to the PDADMAC molecules in the form of small cylindrical surfactant micelles even at very low SDS-to-PDADMAC ratios. In this way, these anisometric surfactant self-assemblies formed in excess polyelectrolyte mimic the basic building units of the hexagonal structure of the PDADMAC/SDS precipitate and/or suspensions formed at charge equivalence or at higher SDS-to-PDADMAC ratios. The presence of DDM reduces the cmc and cac for the system but does not alter significantly the structure of the complexes in either the one-phase or two-phase region. The only exception is for samples at SDS-to-PDADMAC ratios close to charge neutralization and a high concentration of DDM where the precipitate forms a multiphasic or distorted hexagonal structure.
Collapse
Affiliation(s)
- Beatrice Plazzotta
- †Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University , Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Edit Fegyver
- ‡Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, Hungary
| | - Róbert Mészáros
- ‡Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, Hungary
- §Department of Chemistry, University J. Selyeho, 945 01 Komárno, Slovakia
| | - Jan Skov Pedersen
- †Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University , Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| |
Collapse
|
19
|
Fegyver E, Mészáros R. Complexation between Sodium Poly(styrenesulfonate) and Alkyltrimethylammonium Bromides in the Presence of Dodecyl Maltoside. J Phys Chem B 2015; 119:5336-46. [DOI: 10.1021/acs.jpcb.5b01206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edit Fegyver
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Pázmány Péter sétány
1/A, Hungary
| | - Róbert Mészáros
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Pázmány Péter sétány
1/A, Hungary
- Department
of Chemistry, University J. Selyeho, 945 01 Komárno, Slovakia
| |
Collapse
|