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Bhattarai A, Das B. Viscosity of Sodium Polystyrenesulfonate with Cetyltrimethylammonium Bromide in the Mixture of Methanol and Water. J Phys Chem B 2023; 127:7048-7053. [PMID: 37505907 DOI: 10.1021/acs.jpcb.3c02565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Viscosity of cetyltrimethylammonium bromide (CTAB) in the presence of sodium polystyrene sulfonate (NaPSS) in methanol-water mixed solvent media has been reported at 308.15 K. The results have been analyzed on the basis of a simple model based on the scaling theory of the viscosity of polyelectrolyte solutions put forward by Plucktaveesak et al. (J. Phys. Chem. B, 2003, 107, 8166-8171). The specific viscosity data obtained here for the CTAB-NaPSS couple in mixed solvent media agree very well with the predictions of the above model. It has been established that the fraction of free counterions of the polyelectrolyte can be conveniently recovered in these complex fluids.
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Affiliation(s)
- Ajaya Bhattarai
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India
- Department of Chemistry, Mahendra Morang Adarsh Multiple Campus, Tribhuvan University, Biratnagar 56613, Nepal
| | - Bijan Das
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India
- Department of Chemistry, Presidency University, Kolkata, West Bengal, 700073, India
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2
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Gradzielski M. Polymer-Surfactant Interaction for Controlling the Rheological Properties of Aqueous Surfactant Solutions. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Del Sorbo GR, Clemens D, Schneck E, Hoffmann I. Stimuli-responsive polyelectrolyte surfactant complexes for the reversible control of solution viscosity. SOFT MATTER 2022; 18:2434-2440. [PMID: 35274665 DOI: 10.1039/d1sm01774h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Interactions of polyelectrolytes with oppositely charged surfactants can give rise to a large variety of self-assembled structures. Some of these systems cause a drastic increase in solution viscosity, which is related to the surfactant forming aggregates interconnecting several polyelectrolyte chains. For these aggregates to form, the surfactant needs to be sufficiently hydrophobic. Here, we present a system consisting of the anionic surfactant sodium monododecyl phosphate and the cationic cellulose-based polyelectrolyte JR 400. The hydrophobicity of the surfactant can be controlled by the solution's pH. At pH > 12, the surfactant headgroup bears two charges. As a consequence, the solution viscosity decreases drastically by up to two orders of magnitude, while it can be as high as 10 Pa s at lower pH. In this paper, we investigate the changes of the mesoscopic structure of the system which lead to such drastic changes in viscosity using small angle neutron scattering and neutron spin-echo spectroscopy. Such systems are potentially interesting as they allow for a modular design where stimuli responsiveness is introduced by relatively small amounts of surfactant reusing the same simple polyelectrolyte.
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Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France.
| | - Daniel Clemens
- Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109, Berlin, Germany
| | - Emanuel Schneck
- Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany.
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France.
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4
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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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5
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Del Sorbo GR, Cristiglio V, Clemens D, Hoffmann I, Schneck E. Influence of the Surfactant Tail Length on the Viscosity of Oppositely Charged Polyelectrolyte/Surfactant Complexes. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02728] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Viviana Cristiglio
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Daniel Clemens
- Helmholtz Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Emanuel Schneck
- Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany
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6
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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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7
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Del Sorbo GR, Prévost S, Schneck E, Gradzielski M, Hoffmann I. On the Mechanism of Shear-Thinning in Viscous Oppositely Charged Polyelectrolyte Surfactant Complexes (PESCs). J Phys Chem B 2020; 124:909-913. [PMID: 31935087 DOI: 10.1021/acs.jpcb.9b10467] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Semidilute mixtures of the cationically modified cellulose-based polyelectrolyte JR 400 and the anionic surfactant sodium dodecyl sulfate (SDS) form highly viscous solutions if a slight excess of charges from the polyelectrolyte is present. The reason for this is the formation of mixed rodlike aggregates in which the surfactant cross-links several polyelectrolyte chains. The same solutions also show shear-thinning behavior. In this paper, we use rheoSANS to investigate the structural evolution of the rodlike aggregates under steady shear and thereby elucidate the mechanism of shear-thinning in these viscous oppositely charged polyelectrolyte surfactant complexes.
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Affiliation(s)
- Giuseppe Rosario Del Sorbo
- Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1 , 14476 Potsdam , Germany.,Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
| | - Emanuel Schneck
- Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1 , 14476 Potsdam , Germany.,Soft Matter Biophysics, Department of Physics , TU Darmstadt , Hochschulstraße 8 , D-64289 Darmstadt , Germany
| | - 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
| | - Ingo Hoffmann
- Institut Max von Laue-Paul Langevin (ILL) , 71 avenue des Martyrs, CS 20156 , F-38042 Grenoble Cedex 9, France
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8
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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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9
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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]
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10
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Oberdisse J. Introduction to soft matter and neutron scattering. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818801001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
As an opening lecture to the French-Swedish neutron scattering school held in Uppsala (6th to 9th of December 2016), the basic concepts of both soft matter science and neutron scattering are introduced. Typical soft matter systems like self-assembled surfactants in water, microemulsions, (co-)polymers, and colloids are presented. It will be shown that widely different systems have a common underlying physics dominated by the thermal energy, with astonishing consequences on their statistical thermodynamics, and ultimately rheological properties – namely softness. In the second part, the fundamentals of neutron scattering techniques and in particular small-angle neutron scattering as a powerful method to characterize soft matter systems will be outlined.
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11
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Khalid K, Zain SM, Suk VRE, Khan MN. Microscopic Evidence for the Correlation of Micellar Structures and Counterion Binding Constant for Flexible Nanoparticle Catalyzed Piperidinolysis of PS− in Colloidal System. TENSIDE SURFACT DET 2017. [DOI: 10.3139/113.110499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The interest to determine the ionization degree of counterion initiates the need to study the relationship between counterion binding constant (RX
Br) and the growth of self-assembly micellar structure. This paper discussed the microscopic evidence for the correlation of counterion binding constant values and micellar structure of cationic surfactants in the presence of phenolates and 2-ethyl phenolates ions in flexible nanoparticle (FN)-system of ionized phenyl salicylate-catalyzed piperidinolysis. The sizes of micelles were determined by particle size analysis. Transmission electron microscopy (TEM) results showed a spherical micellar structure for phenolates and 2-ethyl phenolates ions at counterion binding constant values 6.3 ± 1.0 and 24.0 ± 1.1 respectively. A study using a semi-emperical kinetic technique in published article proved that the suggested micellar structures at respective counterion binding constant values corresponded with the present microscopic evidence.
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Affiliation(s)
- Khalisanni Khalid
- Department of Chemistry , Faculty of Science, University of Malaya, 50603 Kuala Lumpur , Malaysia
- Laboratory Management Program , Laboratory and Technical Service Centre, Malaysian Agricultural Research and Development Institute (MARDI), 43400 Serdang, Selangor , Malaysia
| | - Sharifuddin Md. Zain
- Department of Chemistry , Faculty of Science, University of Malaya, 50603 Kuala Lumpur , Malaysia
| | - Vicit Rizal Eh Suk
- Department of Chemistry , Faculty of Science, University of Malaya, 50603 Kuala Lumpur , Malaysia
| | - M. Niyaz Khan
- Department of Chemistry , Faculty of Science, University of Malaya, 50603 Kuala Lumpur , Malaysia
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12
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Buchold P, Schweins R, Di Z, Gradzielski M. Structural behaviour of sodium hyaluronate in concentrated oppositely charged surfactant solutions. SOFT MATTER 2017; 13:2253-2263. [PMID: 28261739 DOI: 10.1039/c6sm02742c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This work discusses the polyelectrolyte sodium hyaluronate (HA) and its polyelectrolyte/surfactant complexes (PESCs) with tetradecyltrimethylammonium bromide (TTAB) in the semi-dilute regime of HA and at high concentrations of TTAB. The structure and flow properties in the surfactant excess region were studied by light scattering and small angle neutron scattering (SANS) as well as by rheology. The unique behaviour of HA to maintain its high viscosity was observed even at very high TTAB concentrations of 496 mM and this effect was systematically studied in the concentration range from 1 to 25 mM HA. From the data, it could be concluded that: (1) extended rod-like structures of the PESCs prevent molecular dissolution of HA by TTAB. (2) HA and TTAB micelles interact rather weakly as seen by a low fraction of bound micelles. (3) At very high TTAB concentrations a decompaction of PESCs (fractal dimension Df going from 2.0 to 1.2) occurs with increasing HA concentration but (4) both the entanglement of HA and the structure of the micelles are not affected.
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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. and Institut Laue-Langevin (ILL), DS/LSS, 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble CEDEX 9, France
| | - Ralf Schweins
- Institut Laue-Langevin (ILL), DS/LSS, 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble CEDEX 9, France
| | - Zhenyu Di
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany.
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13
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Hoffmann I, Simon M, Farago B, Schweins R, Falus P, Holderer O, Gradzielski M. Structure and dynamics of polyelectrolyte surfactant mixtures under conditions of surfactant excess. J Chem Phys 2016; 145:124901. [PMID: 27782635 DOI: 10.1063/1.4962581] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Ingo Hoffmann
- 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
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - 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
| | - Bela Farago
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Peter Falus
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
| | - Olaf Holderer
- JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - 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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14
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Hoffmann I, Farago B, Schweins R, Falus P, Sharp M, Prévost S, Gradzielski M. On the mesoscopic origins of high viscosities in some polyelectrolyte-surfactant mixtures. J Chem Phys 2015; 143:074902. [PMID: 26298151 DOI: 10.1063/1.4928583] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ingo Hoffmann
- 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
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Bela Farago
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Peter Falus
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Melissa Sharp
- Institut Max von Laue-Paul Langevin (ILL), F-38042 Grenoble Cedex 9, France
| | - Sylvain Prévost
- 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
- Helmholtz-Zentrum Berlin, D-14109 Berlin, Germany
| | - 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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16
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Zakrevskyy Y, Cywinski P, Cywinska M, Paasche J, Lomadze N, Reich O, Löhmannsröben HG, Santer S. Interaction of photosensitive surfactant with DNA and poly acrylic acid. J Chem Phys 2014; 140:044907. [DOI: 10.1063/1.4862679] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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17
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Altin B, Barth A, Bressel K, Chiappisi L, Dürr M, Dzionara M, Elgammal M, Fliegner D, Ganas C, Gupta S, Hedicke G, Heunemann P, Hoffmann I, Joksimovic R, Kaur R, Klee A, Liu HY, Lutzki J, de Molina PM, Medebach M, Michel R, Muthig M, Nguyen-Kim V, Oppel C, Prévost S, Popig J, Riemer S, Sperling M, Strassnick R, Zhang L, Gradzielski M. Investigations in the Stranski-Laboratorium of the TU Berlin – Physical Chemistry of Colloidal Systems – Going Towards Complexity and Functionality. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The research topics of our group are in general from the field of physical chemistry of colloidal systems. Within this rather wide layout a large variety of quite different questions and systems are tackled, where the common bridging factor is the aim of understanding the properties of colloidal systems based on their mesoscopic structure and dynamics, which in turn are controlled by their molecular composition. With such an enhanced understanding of the correlation between mesoscopic structure and the macroscopic properties the goal then is to employ this knowledge in order to formulate increasingly complex colloidal system with correspondingly more variable and interesting functionalities. From this general context of investigations, some representative systems and questions that have been studied in recent time by us are covered in this text.
They comprise the phase behaviour and the structures formed in solutions of surfactants and amphiphilic copolymers. Once these static properties are known, we also have a high interest in the dynamic properties and the kinetics of morphological transitions as they are observed under non-equilibrium conditions, since they are frequently encountered in applications. A key property of amphiphilic molecules is their ability to solubilise sparingly soluble compounds thereby forming microemulsions or nanoemulsions, where the ability to form such systems depends strongly on the molecular architecture of the amphiphiles. By turning to polymeric amphiphiles the concept of surfactants and their architecture can be extended largely towards more versatile structures, more complex self-assembly and much larger length and time scales. Another direction is the surfactant assisted formation of nanoparticles or mesoporous inorganic materials. By combining copolymers with other polymers, copolymers, colloids, or surfactants – for instance via electrostatically driven co-assembly – one may then form increasingly complex colloidal aggregates. By doing so one is able to control rheological properties or develop complex delivery systems, whose properties can be tailor-made by appropriate choice of the molecular build-up. This striving towards well controlled complexity achieved by means of self- and co-assembly then leads to increasingly more functional systems and is the key direction for future research activities in our group.
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