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Interactions between Charged Surfaces Triggered by Multivalent Ions

English title Interactions between Charged Surfaces Triggered by Multivalent Ions
Applicant Borkovec Michal
Number 124383
Funding scheme Project funding
Research institution Département de Chimie Minérale et Analytique Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Physical Chemistry
Start/End 01.06.2009 - 31.05.2012
Approved amount 618'875.00
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Keywords (7)

surface forces; particle aggregation; atomic force microscopy; light scattering; particle deposition; multivalent ions; adsorption

Lay Summary (English)

Lead
Lay summary
Surfaces of minerals, colloidal particles, or microorganisms interact by various forces, mostly of electrostatic origin. These forces are essential in controlling the known behavior a wide variety of systems (e.g., rivers, soils, living organisms) and processes (e.g., water treatment, papermaking, drug delivery). While the control of these forces is essential in numerous disciplines, we are basically unable to predict their magnitude, and sometimes even cannot rationalize their origin. The presence of multivalent ions influences these forces dramatically. This is the reason why trivalent aluminium or iron ions are used for water purification, for example. But the mechanisms how these ions influence the interaction forces continue to be debated. One group of scientists asserts that the interactions are governed by ion-specific chemical forces, while others suspect that generic aspects of electrostatic interactions are responsible for the observed behavior. The present project aims at clarifying this controversy, and will elucidate adsorption and interactions of colloidal particles in the presence of multivalent ions. Numerous state-of-the-art techniques will be used, such as, light scattering, electrophoresis, and electrochemical techniques. In particular, direct force measurements between individual particles will be carried out with the atomic force microscope. The experimental results will be confronted with current theories of interaction forces with the aim to indentify the principal mechanisms. This project is expected to have impact in several applied fields, particularly, where adsorption processes and aggregation of colloidal particles are important. The clarification of the underlying mechanisms of the interaction forces will have implications in the development better strategies in numerous fields, for example, water purification, drug delivery, ro environmental remediation.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Destabilization of colloidal suspensions by multivalent ions and polyelectrolytes: From screening to overcharging
Szilagyi I., Sadeghpour A., Borkovec M. (2012), Destabilization of colloidal suspensions by multivalent ions and polyelectrolytes: From screening to overcharging, in Langmuir, 28, 6211-6215.
Structure of adsorbed polyelectrolyte monolayers investigated by combining optical reflectometry and piezoelectric techniques
Porus M., Maroni P., Borkovec M. (2012), Structure of adsorbed polyelectrolyte monolayers investigated by combining optical reflectometry and piezoelectric techniques, in Langmuir, 28, 5642-5651.
Adsorption of monovalent and divalent cations on planar water-silica interfaces studied by optical reflectivity and Monte Carlo simulations
Porus M., Labbez C., Maroni P., Borkovec M. (2011), Adsorption of monovalent and divalent cations on planar water-silica interfaces studied by optical reflectivity and Monte Carlo simulations, in J. Chemical Physics, 135, 064701-064701.
Charge reversal of sulfate latex particles by adsorbed linear poly(ethylene imine) probed by multiparticle colloidal probe technique
Finessi M., Sinha P., Szilagyi I., Popa I., Maroni P., Borkovec M. (2011), Charge reversal of sulfate latex particles by adsorbed linear poly(ethylene imine) probed by multiparticle colloidal probe technique, in Journal of Physical Chemistry B, 115, 9098-9105.
Charging and stability of anionic latex particles in the presence of linear poly(ethylene imine)
Szilagyi I., Rosicka D., Hierrezuelo J., Borkovec M. (2011), Charging and stability of anionic latex particles in the presence of linear poly(ethylene imine), in Journal Colloid and Interface Science, 360, 580-585.
Influence of the ionization degree and molecular mass of weak polyelectrolytes on charging and stability behavior of oppositely charged colloidal particles
Sadeghpour A., Seyrek E., Szilagyi I., Hierrezuelo J., Borkovec M. (2011), Influence of the ionization degree and molecular mass of weak polyelectrolytes on charging and stability behavior of oppositely charged colloidal particles, in Langmuir, 27, 9270-9276.
Molecular mass dependence of adsorbed amount and hydrodynamic thickness of polyelectrolyte layers
Seyrek E., Hierrezuelo J., Sadeghpour A., Szilagyi I., Borkovec M. (2011), Molecular mass dependence of adsorbed amount and hydrodynamic thickness of polyelectrolyte layers, in Physical Chemistry Chemical Physics, 13, 12716-12719.
Probing conformational changes of polyamidoamine (PAMAM) dendrimers adsorbed on silica substrates
Muresan L., Maroni P., Popa I., Porus M., Longtin R., Papastavrou G., Borkovec M. (2011), Probing conformational changes of polyamidoamine (PAMAM) dendrimers adsorbed on silica substrates, in Macromolecules, 44, 5069-5071.
Zipper and layer-by-layer assemblies of artificial photosystems analyzed by combining optical and piezoelectric surface techniques
Porus M., Maroni P., Bhosale R., Sakai N., Matile S., Borkovec M. (2011), Zipper and layer-by-layer assemblies of artificial photosystems analyzed by combining optical and piezoelectric surface techniques, in Langmuir, 27, 7213-7221.
Attractive and repulsive electrostatic forces between positively charged latex particles in the presence of anionic linear polyelectrolytes
Popa I., Gillies G., Papastavrou G., Borkovec M. (2010), Attractive and repulsive electrostatic forces between positively charged latex particles in the presence of anionic linear polyelectrolytes, in Journal of Physical Chemistry B, 114, 3170-3177.
Charge regulation effects on electrostatic patch-charge attraction induced by adsorbed dendrimers
Popa I., Papastavrou G., Borkovec M. (2010), Charge regulation effects on electrostatic patch-charge attraction induced by adsorbed dendrimers, in Physical Chemistry Chemical Physics, 12, 4863-4871.
Effective charge of adsorbed poly(amido amine) dendrimers: Transition from heterogeneous to homogeneous charge distribution
Popa I., Papastavrou G., Borkovec M. (2010), Effective charge of adsorbed poly(amido amine) dendrimers: Transition from heterogeneous to homogeneous charge distribution, in Macromolecules, 43, 1129-1136.
Electrostatic stabilization of charged colloidal particles with adsorbed polyelectrolytes of opposite charge
Hierrezuelo J., Sadeghpour A., Szilagyi I., Vaccaro A., Borkovec M. (2010), Electrostatic stabilization of charged colloidal particles with adsorbed polyelectrolytes of opposite charge, in Langmuir, 26, 15109-15111.
Highly-sensitive reflectometry setup capable of probing the electrical double layer on silica
Porus M., Maroni P., Borkovec M. (2010), Highly-sensitive reflectometry setup capable of probing the electrical double layer on silica, in Sensors Actuators B, 151, 250-255.
Importance of charge regulation in attractive double-layer forces between dissimilar surfaces
Popa I., Finessi M., Sinha P., Maroni P., Papastavrou G., Borkovec M. (2010), Importance of charge regulation in attractive double-layer forces between dissimilar surfaces, in Phys. Rev. Lett., 104, 228301-228301.
Probing nanometer-thick polyelectrolyte layers adsorbed on oppositely charged particles by dynamic light scattering
Hierrezuelo J., Szilagyi I., Vaccaro A., Borkovec M. (2010), Probing nanometer-thick polyelectrolyte layers adsorbed on oppositely charged particles by dynamic light scattering, in Macromolecules, 43, 9108-9116.
Stability of negatively charged latex particles in the presence of a strong cationic polyelectrolyte at elevated ionic strengths
Hierrezuelo J., Vaccaro A., Borkovec M. (2010), Stability of negatively charged latex particles in the presence of a strong cationic polyelectrolyte at elevated ionic strengths, in J. Colloid Interf. Sci. , 347, 202-208.
Attractive electrostatic forces between identical colloidal particles induced by adsorbed polyelectrolytes
Popa I., Gillies G., Papastavrou G., Borkovec M. (2009), Attractive electrostatic forces between identical colloidal particles induced by adsorbed polyelectrolytes, in Journal of Physical Chemistry B, 113, 8458-8461.
Long-ranged attractive forces induced by adsorbed dendrimers: Direct force measurements and computer simulations
Popa I., Papastavrou G., Borkovec M., Trulsson M., Jonsson B. (2009), Long-ranged attractive forces induced by adsorbed dendrimers: Direct force measurements and computer simulations, in Langmuir, 25, 12435-12438.
Ion-specific responsiveness of polyamidoamine (PAMAM) dendrimers adsorbed on silica substrates
Porus M., Clerc F., Maroni P., Borkovec M., Ion-specific responsiveness of polyamidoamine (PAMAM) dendrimers adsorbed on silica substrates, in Macromolecules.

Collaboration

Group / person Country
Types of collaboration
University of Geneva Switzerland (Europe)
- Publication
University of Bourgogne France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Lund Sweden (Europe)
- Publication

Associated projects

Number Title Start Funding scheme
140327 Tuning Interactions between Dissimilar Surfaces by Polyelectrolytes 01.06.2012 Project funding
67459 R'EQUIP 2002: Installation of a Modern Light Scattering Facility 01.07.2002 R'EQUIP
136191 Designing Interactions across Interfaces in Ionic Liquids 01.01.2012 Sinergia
128680 Polyelectrolytes and Interfaces Investigated by Atomic Force Microscopy 01.12.2009 R'EQUIP
111760 Adsorption mechanisms of linear polyelectrolytes to water-solid interfaces 01.06.2006 Project funding
111760 Adsorption mechanisms of linear polyelectrolytes to water-solid interfaces 01.06.2006 Project funding
117333 Polyelectrolyte Films on Solid Substrates / Dual Polarization Interferometer 01.07.2007 R'EQUIP
135966 Resolution of Microscopic Proton Binding Enthalpies for Acrylic Acid Oligomers 01.05.2011 International short research visits

Abstract

Multivalent ions strongly modify interactions between charged interfaces, and therefore such ions represent important additives to control aggregation or deposition of colloidal particles. For example, multivalent metal ions are used in waste water treatment to accelerate particle aggregation, or they play an essential role in cement hardening. While multivalent ions were already addressed in the classical theory of colloidal aggregation by Derjaguin, Landau, Verwey, and Overbeek (DLVO), this topic is receiving renewed attention due to two recent developments. The first development relates to new theories of the electrical double layer. It is now firmly established that the classical Poisson-Boltzmann (PB) may fail for multivalent ions, and that such ions can adsorb on oppositely charged surfaces due to electrostatic interactions so strongly that the surface may reverse its charge. In the past, it was thought that such a charge reversal is only possible if the adsorption of the ions is controlled by ion-specific forces. Moreover, these theories show that in the presence of multivalent ions, additional non-DLVO attractive forces become relevant and these forces are likely to be important in colloidal aggregation and deposition.The second development concerns important advances in experimental techniques able to probe interaction forces between colloidal particles or between such particles and surfaces. One of these techniques is the colloidal probe method based on the atomic force microscope (AFM). Moreover, one can reliably measure aggregation rate constants with scattering techniques, while particle deposition can be studied by surface sensitive methods. With these techniques at hand, such processes can be investigated experimentally with confidence.The present project builds on these developments, and addresses adsorption of multivalent ions on water-solid interfaces, resulting interactions forces, and consequences for aggregation and deposition phenomena. Adsorption of multivalent ions will be studied on well-defined colloidal latex particles with electrophoresis, cross-flow filtration, and potentiometry. Forces between these particles will be directly measured with the AFM, while their aggregation rates will be probed with light scattering. Situations involving asymmetric particle systems will be studied similarly. Interaction forces between particles and planar substrates will be also assessed with AFM, while the corresponding deposition processes will be followed with optical reflectivity and quartz crystal microbalance. These processes will be modeled with classical surface complexation models and DLVO theory. Comparison with modern theories of the electrical double layer will be achieved through collaborations with groups from other universities.The main goal of the project is to elucidate whether interactions in the presence of multivalent ions are principally governed by generic electrostatic interactions or by ion-specific forces. Furthermore, the origin of additional non-DLVO attractive forces will be clarified, and it will be assessed whether these forces may explain the known discrepancies of DLVO theory in aggregation and deposition processes.
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