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Molecular diffusion in ternary poly(vinyl alcohol) solutions. Front Chem Sci Eng 2021. [DOI: 10.1007/s11705-021-2121-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AbstractThe diffusion kinetics of a molecular probe—rhodamine B—in ternary aqueous solutions containing poly(vinyl alcohol), glycerol, and surfactants was investigated using fluorescence correlation spectroscopy and dynamic light scattering. We show that the diffusion characteristics of rhodamine B in such complex systems is determined by a synergistic effect of molecular crowding and intermolecular interactions between chemical species. The presence of glycerol has no noticeable impact on rhodamine B diffusion at low concentration, but significantly slows down the diffusion of rhodamine B above 3.9% (w/v) due to a dominating steric inhibition effect. Furthermore, introducing surfactants (cationic/nonionic/anionic) to the system results in a decreased diffusion coefficient of the molecular probe. In solutions containing nonionic surfactant, this can be explained by an increased crowding effect. For ternary poly(vinyl alcohol) solutions containing cationic or anionic surfactant, surfactant—polymer and surfactant—rhodamine B interactions alongside the crowding effect of the molecules slow down the overall diffusivity of rhodamine B. The results advance our insight of molecular migration in a broad range of industrial complex formulations that incorporate multiple compounds, and highlight the importance of selecting the appropriate additives and surfactants in formulated products.
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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
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3
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Buchold P, Ram-On M, Talmon Y, Hoffmann I, Schweins R, Gradzielski M. Uncommon Structures of Oppositely Charged Hyaluronan/Surfactant Assemblies under Physiological Conditions. Biomacromolecules 2020; 21:3498-3511. [PMID: 32786536 DOI: 10.1021/acs.biomac.0c00221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Self-assembled aggregates formed by semidilute polyanion hyaluronan (hyaluronic acid, HA) and an oppositely charged surfactant tetradecyltrimethylammonium bromide (TTAB) in an aqueous phosphate-buffered saline (PBS) solution have been studied via light scattering (LS), small-angle neutron scattering (SANS), and cryogenic transmission electron microscopy (cryo-TEM). The addition of 0-20 mM TTAB to a 27.7 mM (monomer, 1 wt %) HA solution (597 kDa) in PBS buffer leads to soluble complexes until phase separation occurs near charge equilibrium (>20 mM TTAB). While the viscosity remains rather constant, already small amounts of added TTAB lead to the formation of large globular superstructures, which are built in a hierarchical fashion from a locally threadlike structural arrangement of TTA micelles along the stiff HA chains, within the little changed HA network. These globular domains have radii of 60-100 nm and contain 500-700 TTA micelles, which means that they are very "fluffy" and composed of about 99% water. They do not grow in size or number upon further TTAB addition, but, instead, the additional TTA micelles form further threadlike complexes outside of the big globular domains. Such a type of polyelectrolyte-surfactant complexes (PESCs) has not been described before and has to be attributed to the particular properties of HA, which are high stiffness and relatively weak interactions with oppositely charged micelles due to having the charged carboxylic group close to the polysaccharide backbone. These findings demonstrate that the HA network structure in solution basically remains unaffected by complexation with an oppositely charged surfactant, explaining the unchanged rheological behavior and the formation of a unique PESC local "coacervate" structure within the HA hydrogel network.
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Affiliation(s)
- Philipp Buchold
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany.,Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Maor Ram-On
- Department of Chemical Engineering and The Russell Berrie Nanotechnology Institute (RBNI), Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Yeshayahu Talmon
- Department of Chemical Engineering and The Russell Berrie Nanotechnology Institute (RBNI), Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Ingo Hoffmann
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany
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Masrat R, Shah RA, Lone MS, Ashraf U, Afzal S, Rather GM, Dar AA. Comparison between the interfacial and bulk rheology of sodium carboxymethylcellulose in the presence of cationic and non-ionic surfactants. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112477] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Hoffmann I, Simon M, Bleuel M, Falus P, Gradzielski M. Structure, Dynamics, and Composition of Large Clusters in Polyelectrolyte–Surfactant Systems. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ingo Hoffmann
- Institut Max von
Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042 Grenoble, France
- 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
| | - Miriam Simon
- 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
| | - Markus Bleuel
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
| | - Peter Falus
- Institut Max von
Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, Cedex 9, F-38042 Grenoble, 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
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6
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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]
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7
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Electro-optic Kerr effect in the study of mixtures of oppositely charged colloids. The case of polymer-surfactant mixtures in aqueous solutions. Adv Colloid Interface Sci 2017; 247:234-257. [PMID: 28552423 DOI: 10.1016/j.cis.2017.05.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/04/2017] [Accepted: 05/14/2017] [Indexed: 11/20/2022]
Abstract
In this review I highlight a very sensitive experimental technique for the study of polymer-surfactant complexation: The electro-optic Kerr effect. This review does not intend to be exhaustive in covering the Kerr Effect nor polymer-surfactant systems, instead it aims to call attention to an experimental technique that, even if applied in a qualitative manner, could give very rich and unique information about the structures and aggregation processes occurring in mixtures of oppositely charged colloids. The usefulness of electric birefringence experiments in the study of such systems is illustrated by selected results from literature in hope of stimulating the realization of more birefringence experiments on similar systems. This review is mainly aimed at, but not restricted to, researchers working in polyelectrolyte-surfactant mixtures in aqueous solutions, Kerr effect is a powerful experimental tool that could be used in the study of many systems in diverse areas of colloidal physics.
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Guzmán E, Llamas S, Maestro A, Fernández-Peña L, Akanno A, Miller R, Ortega F, Rubio RG. Polymer-surfactant systems in bulk and at fluid interfaces. Adv Colloid Interface Sci 2016; 233:38-64. [PMID: 26608684 DOI: 10.1016/j.cis.2015.11.001] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 10/30/2015] [Accepted: 11/02/2015] [Indexed: 11/30/2022]
Abstract
The interest of polymer-surfactant systems has undergone a spectacular development in the last thirty years due to their complex behavior and their importance in different industrial sectors. The importance can be mainly associated with the rich phase behavior of these mixtures that confers a wide range of physico-chemical properties to the complexes formed by polymers and surfactants, both in bulk and at the interfaces. This latter aspect is especially relevant because of the use of their mixture for the stabilization of dispersed systems such as foams and emulsions, with an increasing interest in several fields such as cosmetic, food science or fabrication of controlled drug delivery structures. This review presents a comprehensive analysis of different aspects related to the phase behavior of these mixtures and their intriguing behavior after adsorption at the liquid/air interface. A discussion of some physical properties of the bulk is also included. The discussion clearly points out that much more work is needed for obtaining the necessary insights for designing polymer-surfactant mixtures for specific applications.
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Affiliation(s)
- Eduardo Guzmán
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | - Sara Llamas
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Istituto per l'Energetica e le Interfasi-U.O.S. Genova-Consiglio Nazionale delle Ricerche Via de Marini 6, 16149, Genova, Italy
| | - Armando Maestro
- Department of Physics, Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Laura Fernández-Peña
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Andrew Akanno
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Instituto Pluridisciplinar-Universidad Complutense de Madrid, Avenida Juan XXIII 1, 28040, Madrid, Spain
| | - Reinhard Miller
- Max-Planck-Institut für Kolloid und Grenzflächenforschung, Am Mühlenberg 1, 14476-Golm, Potsdam, Germany
| | - Francisco Ortega
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Ramón G Rubio
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Instituto Pluridisciplinar-Universidad Complutense de Madrid, Avenida Juan XXIII 1, 28040, Madrid, Spain.
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Chiappisi L, Gradzielski M. Co-assembly in chitosan-surfactant mixtures: thermodynamics, structures, interfacial properties and applications. Adv Colloid Interface Sci 2015; 220:92-107. [PMID: 25865361 DOI: 10.1016/j.cis.2015.03.003] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 03/23/2015] [Accepted: 03/23/2015] [Indexed: 01/23/2023]
Abstract
In this review, different aspects characterizing chitosan-surfactant mixtures are summarized and compared. Chitosan is a bioderived cationic polysaccharide that finds wide-ranged applications in various field, e.g., medical or food industry, in which synergistic effects with surfactant can play a fundamental role. In particular, the behavior of chitosan interacting with strong and weak anionic, nonionic as well as cationic surfactants is reviewed. We put a focus on oppositely charged systems, as they exhibit the most interesting features. In that context, we discuss the thermodynamic description of the interaction and in particular the structural changes as they occur as a function of the mixed systems and external parameters. Moreover, peculiar properties of chitosan coated phospholipid vesicles are summarized. Finally, their co-assembly at interfaces is briefly reviewed. Despite the behavior of the mentioned systems might strongly differ, resulting in a high variety of properties, few general rules can be pointed out which improve the understanding of such complex systems.
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Zhao XF, Winter WT. Cellulose/Cellulose-Based Nanospheres: Perspectives and Prospective. Ind Biotechnol (New Rochelle N Y) 2015. [DOI: 10.1089/ind.2014.0030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xing Fei Zhao
- Department of Chemistry and Cellulose Research Institute, State University of New York College of Environmental Science and Forestry (SUNY-ESF), Syracuse, NY
| | - William T. Winter
- Department of Chemistry and Cellulose Research Institute, State University of New York College of Environmental Science and Forestry (SUNY-ESF), Syracuse, NY
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11
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Chiappisi L, Prévost S, Grillo I, Gradzielski M. From crab shells to smart systems: chitosan-alkylethoxy carboxylate complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10608-10616. [PMID: 25115198 DOI: 10.1021/la502569p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, self-assembly of alkyl ethylene oxide carboxylates and the biopolymer chitosan into supramolecular structures with various shapes is presented. Our investigations were done at pH 4.0, where the chitosan is almost fully charged and the surfactants are partially deprotonated. By changing the alkyl chain length and the number of ethylenoxide units very different water-soluble complexes can be obtained, ranging from globular micelles incorporated in a chitosan network to formation of ordered multiwalled vesicles. The structural characteristics of these complexes can be finely controlled by the mixing ratio of chitosan and surfactant, i.e., simply by the solutions composition. For instance, the vesicle wall thickness can be varied between 5 and 50 nm just by varying the mixing ratio. Accordingly, we expect this system to be an outstanding carrier for hydrophilic compounds with tunable release time option. Moreover, an easy route for preparation of chitosan-based complexes in the solid state with controlled mesoscopic order is presented. This work opens the way to prepare biofriendly materials on the basis of chitosan and mild anionic surfactants which are rather versatile with respect to their structure and properties, allowing for preparation of complexes with highly variable structures in both aqueous and solid phase. Formation of such different structures can be exploited for preparation of carriers, which are able to transport hydrophilic as well as hydrophobic molecules. Furthermore, as chitosan is well known to exhibit antibacterial and anti-inflammatory properties, different applications of these complexes can be indicated, i.e., as drug delivery systems or as coatings for medical implants.
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Affiliation(s)
- Leonardo Chiappisi
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin , Straße des 17, Juni 124, Sekretariat TC 7, D-10623 Berlin, Germany
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12
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Bitton R, Chow LW, Zha RH, Velichko YS, Pashuck ET, Stupp SI. Electrostatic control of structure in self-assembled membranes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:500-505. [PMID: 24022896 PMCID: PMC4096135 DOI: 10.1002/smll.201300254] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 07/09/2013] [Indexed: 06/02/2023]
Abstract
Self-assembling peptide amphiphiles (PAs) can form hierarchically ordered membranes when brought in contact with aqueous polyelectrolytes of the opposite charge by rapidly creating a diffusion barrier composed of filamentous nanostructures parallel to the plane of the incipient membrane. Following this event, osmotic forces and charge complexation template nanofiber growth perpendicular to the plane of the membrane in a dynamic self-assembly process. In this work, we show that this hierarchical structure requires massive interfacial aggregation of PA molecules, suggesting the importance of rapid diffusion barrier formation. Strong PA aggregation is induced here through the use of heparin-binding PAs with heparin and also with polyelectrolytes of varying charge density. Small angle X-ray scattering shows that in the case of weak PA-polyelectrolyte interaction, membranes formed display a cubic phase ordering on the nanoscale that likely results from clusters of PA nanostructures surrounded by polyelectrolyte chains.
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Affiliation(s)
| | | | - R. Helen Zha
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, United States
| | - Yuri S. Velichko
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, United States
| | - E. Thomas Pashuck
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, United States
| | - Samuel I. Stupp
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States; Department of Chemistry, Northwestern University, Evanston, IL 60208, United States; Department of Medicine, Northwestern University, Chicago, IL, 60611, United States; Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, IL, 60611, United States
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Tresset G, Marculescu C, Salonen A, Ni M, Iliescu C. Fine control over the size of surfactant-polyelectrolyte nanoparticles by hydrodynamic flow focusing. Anal Chem 2013; 85:5850-6. [PMID: 23713852 DOI: 10.1021/ac4006155] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Synthesis of surfactant-polyelectrolyte nanoparticles was carried out in a microfluidic device with a fine control over the size and the polydispersity. An anionic polysaccharide (sodium carboxymethylcellulose, CMC) solution was focused using a cationic surfactant (dodecyl trimethylammonium bromide, DTAB) solution in a microfluidic channel at selected ratios of flow rates and reagent concentrations. The methodology ensured a controlled mixing kinetics and a uniform distribution of charges at the mixing interface. The resulting nanoparticles exhibited remarkably well-defined and repeatable size distributions, with hydrodynamic diameters tunable from 50 up to 300 nm and polydispersity index around 0.1 in most cases. Microfluidic-assisted self-assembly may be an efficient way to produce well-controlled polyelectrolyte-based nanoparticles suitable for colloidal science as well as for gene delivery applications.
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Affiliation(s)
- Guillaume Tresset
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, 91405 Orsay, France.
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Seliverstova EV, Ibrayev NK, Kudaibergenov SE. Preparation and properties of nanosized fluorescent solid films based on a polyelectrolyte-surfactant complex with organic dyes. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s003602441305021x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hoffmann I, Prévost S, Medebach M, Rogers S, Wagner NJ, Gradzielski M. Control of Rheological Behaviour with Oppositely Charged Polyelectrolyte Surfactant Mixtures. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110157] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Mixtures of the cationic, cellulose based polyelectrolyte JR 400 and the anionic surfactant sodium dodecylbenzene sulfonate (LAS) have been used to control the rheological behaviour of aqueous solutions. Around charge equilibrium precipitation takes place, but both for the surfactant-rich and the polymer-rich side homogeneous solutions are formed. In these monophasic regions the rheology depends strongly on the mixing ratio between the two components and highly viscous systems can be obtained on the polyelectrolyte rich side upon the addition of relatively small amounts of surfactant. Here the viscosity increases by more than four orders of magnitude before reaching the phase boundary of precipitation. Small-angle neutron scattering (SANS) showed the formation of an interconnected network of rodlike aggregates composed of a polyelectrolyte/surfactant complex, which explains the observed high viscosity due to the high degree of interconnection by the polyelectrolyte.
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Affiliation(s)
- I. Hoffmann
- Technische Universität Berlin, Berlin, Germany
| | - S. Prévost
- Technische Universität Berlin, Berlin, Germany
- Helmholtz Zentrum Berlin, Berlin, Germany
| | - M. Medebach
- Technische Universität Berlin, Berlin, Germany
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Janiak J, Bayati S, Galantini L, Pavel NV, Schillén K. Nanoparticles with a bicontinuous cubic internal structure formed by cationic and non-ionic surfactants and an anionic polyelectrolyte. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16536-46. [PMID: 23116203 DOI: 10.1021/la303938k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Nanoparticles with an internal structure have been prepared by dispersing under dilute conditions poly(acrylic acid) with a polymerization degree n = 6000 (PAA6000) together with a cationic surfactant hexadecyltrimethylammonium hydroxide (C16TAOH) and the non-ionic surfactant penta(ethylene glycol) monododecyl ether (C12E5) in water. The nanoparticles are formed at different mixing ratios in the corresponding two-phase regions (liquid crystalline phase/dilute isotropic phase) of the C16TAPA6000 complex salt/C12E5/water ternary phase diagram. The particles consist of polyacrylate PA6000– polyions, C16TA+ surfactant ions, and C12E5. Their internal ordering was identified by small-angle X-ray scattering (SAXS) to be either bicontinuous cubic with the Ia3d crystallographic space group or normal hexagonal depending upon the amount of C12E5. The bicontinuous cubic phase, to our knowledge never observed before in polyelectrolyte–surfactant particle systems, was inferred by SAXS experiments. The data also showed that this structure is thermoresponsive in a reversible manner. The bicontinuous cubic space group transforms from Ia3d to Im3m as the temperature decreases from 25 to 15 °C. According to dynamic light scattering and electrophoretic mobility measurements, the particles have a well-defined size (apparent hydrodynamic radii RH in the range of 88–140 nm) and carry a positive net charge. The size of the nanoparticles is stable up to 1 month. The faceted nanoparticles are visualized by cryogenic transmission electron microscopy that also reveals their coexistence with thread-like C12E5 micelles.
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Affiliation(s)
- John Janiak
- Division of Physical Chemistry, Department of Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Post Office Box 124, SE-221 00 Lund, Sweden
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17
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Seliverstova E, Ibrayev N, Kudaibergenov S. Fluorescencing behavior of thin solid films based on polyelectrolyte-surfactant complex and dye molecules. J Appl Polym Sci 2012. [DOI: 10.1002/app.38723] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Franco IE, Lorchat P, Lamps JP, Schmutz M, Schröder A, Catala JM, Combet J, Schosseler F. From chain collapse to new structures: spectroscopic properties of poly(3-thiophene acetic acid) upon binding by alkyl trimethylammonium bromide surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:4815-4828. [PMID: 22332777 DOI: 10.1021/la204862u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The binding of cationic surfactants with varying alkyl chain length to a regiorandom conjugated polyanion, poly(3-thiophene acetic acid) (PTAA), is studied in an aqueous buffer by using absorption and emission spectroscopies, photon correlation spectroscopy, isothermal titration calorimetry, and cryogenic transmission electron microscopy. We study the mixed solutions as a function of composition ratio R of surfactant molecules to monomer units molar concentrations, at low polymer concentration and in a very wide composition range (10(-6) < R < 10(2)) below the critical micellar concentration. Upon surfactant binding, the molecularly dispersed chains first collapse progressively and then form new structures as the mixed aggregates get enriched in surfactant. The collapse leads to a strong decrease of the conjugation length and to a blue shift of the absorption spectra by 30 to 50 nm. The new structures are responsible for a new intense emission band at about 600 nm, red-shifted by nearly 130 nm from the initial emission maximum of the polymer (~472 nm). As the surfactant tail becomes shorter, the blue shift of the absorption spectra and the intensity raise of the new emission are delayed to larger composition ratios while their variations become smoother functions of the surfactant concentration. These particular spectroscopic properties of PTAA seem related to its unique combination of a strongly hydrophobic backbone, a large ratio of contour length to persistence length, and an overall good aqueous solubility. Our results show that such features are well suited to design a colorimetric biosensor at small composition ratio, and a fluorescent biomarker at large composition ratio.
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Affiliation(s)
- I Echavarri Franco
- Institut Charles Sadron, CNRS-University of Strasbourg, Strasbourg, France
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Gruber R, Michaelsen S, Bergmame L, Frenette S, Bruni O, Fontil L, Carrier J. Short sleep duration is associated with teacher-reported inattention and cognitive problems in healthy school-aged children. Nat Sci Sleep 2012; 4:33-40. [PMID: 23616727 PMCID: PMC3630969 DOI: 10.2147/nss.s24607] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
PURPOSE Pediatric, clinical, and research data suggest that insufficient sleep causes tiredness and daytime difficulties in terms of attention-focusing, learning, and impulse modulation in children with attention deficit hyperactivity disorder (ADHD) or in those with ADHD and primary sleep disorders. The aim of the present study was to examine whether sleep duration was associated with ADHD-like symptoms in healthy, well-developing school-aged children. PATIENTS AND METHODS Thirty-five healthy children (20 boys, 15 girls), aged 7-11 years participated in the present study. Each child wore an actigraphic device on their nondominant wrist for two nights prior to use of polysomnography to assess their typical sleep periods. On the third night, sleep was recorded via ambulatory assessment of sleep architecture in the child's natural sleep environment employing portable polysomnography equipment. Teachers were asked to report symptoms of inattention and hyperactivity/impulsivity on the revised Conners Teacher Rating Scale. RESULTS Shorter sleep duration was associated with higher levels of teacher-reported ADHD-like symptoms in the domains of cognitive problems and inattention. No significant association between sleep duration and hyperactivity symptoms was evident. CONCLUSION Short sleep duration was found to be related to teacher-derived reports of ADHD-like symptoms of inattention and cognitive functioning in healthy children.
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Affiliation(s)
- Reut Gruber
- Department of Psychiatry, McGill University, Montreal, QC, Canada
- Attention, Behavior and Sleep Lab, Douglas Mental Health University Institute, Montreal, QC, Canada
| | - Sonia Michaelsen
- Department of Psychiatry, McGill University, Montreal, QC, Canada
- Attention, Behavior and Sleep Lab, Douglas Mental Health University Institute, Montreal, QC, Canada
| | - Lana Bergmame
- Attention, Behavior and Sleep Lab, Douglas Mental Health University Institute, Montreal, QC, Canada
| | - Sonia Frenette
- Centre du Sommeil et des Rythmes Biologiques, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, Canada
- Departement de Psychologie, Université de Montréal, Montreal, QC, Canada
| | - Oliviero Bruni
- Child Neuropsychiatry Unit, University of Rome, Rome, Italy
| | - Laura Fontil
- Attention, Behavior and Sleep Lab, Douglas Mental Health University Institute, Montreal, QC, Canada
| | - Julie Carrier
- Centre du Sommeil et des Rythmes Biologiques, Hôpital du Sacré-Coeur de Montréal, Montreal, QC, Canada
- Departement de Psychologie, Université de Montréal, Montreal, QC, Canada
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20
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Zhou C, Langevin D, Guillot S. Internal organisation in polyelectrolytes/oppositely charged surfactants colloidal complexes anticipating precipitated nanostructures. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2011; 34:70. [PMID: 21809184 DOI: 10.1140/epje/i2011-11070-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/06/2011] [Accepted: 06/14/2011] [Indexed: 05/31/2023]
Abstract
In this paper, we relate the periodic nanostructures found in the colloidal complexes and the concentrated phases obtained with polyelectrolyte/surfactant aqueous solutions. We present small-angle X-ray scattering studies of the self-organisation of the anionic polymer carboxymethylcellulose with three cationic quaternary ammonium surfactants with different head and tail groups: hexadecyl trimethyl, hexadecyl ethyl dimethyl and didodecyl dimethyl ammonium bromides. We investigated the mesophases obtained above a precipitation threshold. The mixed solutions with the double-chained surfactant led to lamellar phases, in which the repeat distance only depends on the surfactant/carboxyl charge molar ratio. We show that an internal lamellar organisation already takes place in the dilute phase containing colloidal complexes found below the precipitation threshold.
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Affiliation(s)
- C Zhou
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d'Orléans-CNRS, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France
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21
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Lipid–polyelectrolyte complexes at the air–water interface for different lipid packing. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Nizri G, Makarsky A, Magdassi S, Talmon Y. Nanostructures formed by self-assembly of negatively charged polymer and cationic surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:1980-1985. [PMID: 19143559 DOI: 10.1021/la8031013] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The formation of nanoparticles by interaction of an anionic polyelectrolyte, sodium polyacrylate (NaPA), was studied with a series of oppositely charged surfactants with different chain lengths, alkyltrimethylammonium bromide (CnTAB). The binding and formation of nanoparticles was characterized by dynamic light scattering, zeta-potential, and self-diffusion NMR. The inner nanostructure of the particles was observed by direct-imaging cryogenic-temperature transmission electron microscopy (cryo-TEM), indicating aggregates of hexagonal liquid crystal with nanometric size.
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Affiliation(s)
- G Nizri
- Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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23
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Wu Q, Du M, Shangguan YG, Zhou JP, Zheng Q. Investigation on the interaction between C16TAB and NaCMC in semidilute aqueous solution based on rheological measurement. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.08.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Guillot S, Chemelli A, Bhattacharyya S, Warmont F, Glatter O. Ordered Structures in Carboxymethylcellulose−Cationic Surfactants−Copper Ions Precipitated Phases: in Situ Formation of Copper Nanoparticles. J Phys Chem B 2008; 113:15-23. [DOI: 10.1021/jp805613n] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Samuel Guillot
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d’Orléans-CNRS, 1b rue de la Férollerie, F-45071 Orléans Cedex 2, France, and Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - Angela Chemelli
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d’Orléans-CNRS, 1b rue de la Férollerie, F-45071 Orléans Cedex 2, France, and Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - Sanjib Bhattacharyya
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d’Orléans-CNRS, 1b rue de la Férollerie, F-45071 Orléans Cedex 2, France, and Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - Fabienne Warmont
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d’Orléans-CNRS, 1b rue de la Férollerie, F-45071 Orléans Cedex 2, France, and Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - Otto Glatter
- Centre de Recherche sur la Matière Divisée, UMR 6619, Université d’Orléans-CNRS, 1b rue de la Férollerie, F-45071 Orléans Cedex 2, France, and Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
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25
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Gummel J, Boué F, Clemens D, Cousin F. Finite size and inner structure controlled by electrostatic screening in globular complexes of proteins and polyelectrolytes. SOFT MATTER 2008; 4:1653-1664. [PMID: 32907160 DOI: 10.1039/b803773f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We present an extended structural study of globular complexes made by mixing a positively charged protein (lysozyme) and a negatively charged polyelectrolyte (PSS). We study the influence of all the parameters that may act on the structure of the complexes (charge densities and concentration of the species, partial hydrophobicity of the polyion chain, ionic strength). The structures on a scale range lying from 10 Å to 1000 Å are measured by SANS. Whatever the conditions, the same structure is found, based on the formation of dense ∼100 Å globules with a neutral core and a volume fraction of organic species (compacity) of ∼0.3. On the larger scale, the globules are arranged into fractal aggregates. Zetametry measurements show that the globular complexes have a total positive charge when the charge ratio of species introduced in the mixture [-]/[+]intro > 1 and a total negative charge when [-]/[+]intro < 1. This comes from the presence of charged species in slight excess in a layer at the surface of the globules. The globule finite size is determined by the Debye length 1/κ however the physicochemical parameters are modified in the system, as long as chain-protein interactions are of a simple electrostatic nature. The mean number of proteins per primary complex Nlyso_comp grows exponentially on a master curve with 1/κ. This enables to picture the mechanisms of formation of the complexes. There is an initial stage of formation where the growth of the complexes is only driven by attractions between opposite species associated with counterion release. During the growth of the complexes, the globules progressively repel themselves by electrostatic repulsion because their charge increases. When this repulsion becomes dominant in the system, the globules stop growing and behave like charged colloids: they aggregate with a RLCA process, which leads to the formation of fractal aggregates of dimension 2.1.
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Affiliation(s)
- Jérémie Gummel
- Laboratoire Léon Brillouin, CEA Saclay, 91191, Gif sur Yvette Cedex, France
| | - François Boué
- Laboratoire Léon Brillouin, CEA Saclay, 91191, Gif sur Yvette Cedex, France
| | - Daniel Clemens
- Hahn Meitner Institut, BENSC, Glienicker Straße 100, 14109, Berlin-Wannsee, Germany
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, CEA Saclay, 91191, Gif sur Yvette Cedex, France
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Gummel J, Cousin F, Boué F. Structure Transition in PSS/Lysozyme Complexes: A Chain-Conformation-Driven Process, as Directly Seen by Small Angle Neutron Scattering. Macromolecules 2008. [DOI: 10.1021/ma702242d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jérémie Gummel
- Laboratoire Léon Brillouin, CEA Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, CEA Saclay 91191 Gif-sur-Yvette Cedex, France
| | - François Boué
- Laboratoire Léon Brillouin, CEA Saclay 91191 Gif-sur-Yvette Cedex, France
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