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Geonzon LC, Kobayashi M, Sugimoto T, Adachi Y. Adsorption kinetics of polyacrylamide-based polyelectrolyte onto a single silica particle studied using microfluidics and optical tweezers. J Colloid Interface Sci 2023; 630:846-854. [DOI: 10.1016/j.jcis.2022.10.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/08/2022] [Accepted: 10/15/2022] [Indexed: 11/06/2022]
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2
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Alsharif NB, Samu GF, Sáringer S, Szerlauth A, Takács D, Hornok V, Dékány I, Szilagyi I. Antioxidant colloids via heteroaggregation of cerium oxide nanoparticles and latex beads. Colloids Surf B Biointerfaces 2022; 216:112531. [PMID: 35525228 DOI: 10.1016/j.colsurfb.2022.112531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/25/2022] [Accepted: 04/27/2022] [Indexed: 10/18/2022]
Abstract
Antioxidant colloids were developed via controlled heteroaggregation of cerium oxide nanoparticles (CeO2 NPs) and sulfate-functionalized polystyrene latex (SL) beads. Positively charged CeO2 NPs were directly immobilized onto SL particles of opposite surface charge via electrostatic attraction (SL/Ce composite), while negatively charged CeO2 NPs were initially functionalized with poly(diallyldimethylammonium chloride) (PDADMAC) polyelectrolyte and then, aggregated with the SL particles (SPCe composite). The PDADMAC served to induce a charge reversal on CeO2 NPs, while the SL support prevented nanoparticle aggregation under conditions, where the dispersions of bare CeO2 NPs were unstable. Both SL/Ce and SPCe showed enhanced radical scavenging activity compared to bare CeO2 NPs and were found to mimic peroxidase enzymes. The results demonstrate that SL beads are suitable supports to formulate CeO2 particles and to achieve remarkable dispersion storage stability. The PDADMAC functionalization and immobilization of CeO2 NPs neither compromised the peroxidase-like activity nor the radical scavenging potential. The obtained SL/Ce and SPCe artificial enzymes are foreseen to be excellent antioxidant agents in various applications in the biomedical, food, and cosmetic industries.
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Affiliation(s)
- Nizar B Alsharif
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary
| | - Gergely F Samu
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Szilárd Sáringer
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary; Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Adél Szerlauth
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary
| | - Dóra Takács
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary
| | - Viktoria Hornok
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Imre Dékány
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Istvan Szilagyi
- MTA-SZTE Lendület Biocolloids Research Group, University of Szeged, H-6720 Szeged, Hungary; Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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3
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Feng L, Adachi Y, Yen Doan TH. Observation of Temporal Change of the Hydrodynamic Layer Thickness of Adsorbed Polyelectrolytes on Spherical Particles by Single-Particle-Tracking method. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Adsorption of epichlorohydrin-dimethylamine at the SiC-water interface: A study on wetting, electrokinetics, dispersion stability. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126947] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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5
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de Lima BM, Hayes PL, Wood-Adams PM. Influence of Polymer Molecular Weight on Chain Conformation at the Polystyrene/Silver Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10036-10045. [PMID: 34379428 DOI: 10.1021/acs.langmuir.1c01211] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The dependence between the conformation of polystyrene (PS) and its molecular weight (Mw) in the vicinity of a metal interface was investigated by sum frequency generation (SFG) spectroscopy. Tilt angles θ ≥ 50° (the angle between the C2 axis of the pendant phenyl ring and the surface normal) were observed for all samples because of the interaction between the aromatic rings and the metal surface. Furthermore, it was found that θ decreases with increasing Mw for PS samples ranging from 20 × 103 g/mol to 400 × 103 g/mol. The intensity of the backbone SFG signal was higher for high Mw PS, compared to low Mw PS, indicating a greater number of backbone interactions with the silver substrate surface for the high Mw sample. These structural differences are driven by different entropic and enthalpic contributions to the free energy of adsorption for different polymer molecular weights. Differences in the polymer free volume and in the relative amount of chain ends with higher mobility may also influence the chain conformation. These results suggest that important interfacial properties of polymeric thin films, such as adhesion and wettability, could be tailored by modifying the polymer Mw to achieve the desired interfacial conformation.
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Affiliation(s)
- Bianca M de Lima
- Department of Chemical and Materials Engineering, Concordia University, 1435 Rue Guy, S- GM 900-13, Montréal, Québec H3H 2L5, Canada
| | - Patrick L Hayes
- Department of Chemistry, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, Québec H2V 0B3, Canada
| | - Paula M Wood-Adams
- Department of Chemical and Materials Engineering, Concordia University, 1435 Rue Guy, S- GM 900-13, Montréal, Québec H3H 2L5, Canada
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Somosi Z, May NV, Sebők D, Pálinkó I, Szilágyi I. Catalytic antioxidant nanocomposites based on sequential adsorption of redox active metal complexes and polyelectrolytes on nanoclay particles. Dalton Trans 2021; 50:2426-2435. [PMID: 33527932 DOI: 10.1039/d0dt04186f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An antioxidant nanocomposite was prepared by successive adsorption of redox active metal complexes (copper(ii)-bipyridyl and iron(iii)-citrate) and polyelectrolytes (poly(styrene sulfonate) and poly(diallyldimethyl ammonium)) on layered double hydroxide nanoclay. The experimental conditions were optimized in each preparation step and thus, the final composite formed highly stable colloids, i.e., excellent resistance against salt-induced aggregation was achieved. Due to the synergistic effect of the metal complexes, the developed composite showed remarkable activity in the dismutation of superoxide radicals, close to the one determined for the native superoxide dismutase enzyme. The obtained composite is highly selective for superoxide radical dismutation, while its activity in other antioxidant tests was close to negligible. Structural characterization of the composite revealed that the excellent superoxide radical scavenging ability originated from the advantageous coordination geometry around the copper(ii) center formed upon immobilization. The structure formed around the metal centers led to optimal redox features and consequently, to an improved superoxide dismutase-like activity. The catalytic antioxidant composite is a promising candidate to reduce oxidative stress in industrial manufacturing processes, where natural enzymes quickly lose their activity due to the harsh environmental conditions.
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Affiliation(s)
- Zoltán Somosi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Research Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Nóra V May
- Centre for Structural Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary
| | - Dániel Sebők
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Research Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
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7
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Degenkolb L, Dippon U, Pabst S, Klitzke S. Transport and retention of differently coated CeO 2 nanoparticles in saturated sediment columns under laboratory and near-natural conditions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:15905-15919. [PMID: 30963436 PMCID: PMC6533415 DOI: 10.1007/s11356-019-04965-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 03/22/2019] [Indexed: 06/09/2023]
Abstract
Where surface-functionalized engineered nanoparticles (NP) occur in drinking water catchments, understanding their transport within and between environmental compartments such as surface water and groundwater is crucial for risk assessment of drinking water resources. The transport of NP is mainly controlled by (i) their surface properties, (ii) water chemistry, and (iii) surface properties of the stationary phase. Therefore, functionalization of NP surfaces by organic coatings may change their fate in the environment. In laboratory columns, we compared the mobility of CeO2 NP coated by the synthetic polymer polyacrylic acid (PAA) with CeO2 NP coated by natural organic matter (NOM) and humic acid (HA), respectively. The effect of ionic strength on transport in sand columns was investigated using deionized (DI) water and natural surface water with 2.2 mM Ca2+ (soft) and 4.5 mM Ca2+ (hard), respectively. Furthermore, the relevance of these findings was validated in a near-natural bank filtration experiment using HA-CeO2 NP. PAA-CeO2 NP were mobile under all tested water conditions, showing a breakthrough of 60% irrespective of the Ca2+ concentration. In contrast, NOM-CeO2 NP showed a lower mobility with a breakthrough of 27% in DI and < 10% in soft surface water. In hard surface water, NOM-CeO2 NP were completely retained in the first 2 cm of the column. The transport of HA-CeO2 NP in laboratory columns in soft surface water was lower compared to NOM-CeO2 NP with a strong accumulation of CeO2 NP in the first few centimeters of the column. Natural coatings were generally less stabilizing and more susceptible to increasing Ca2+ concentrations than the synthetic coating. The outdoor column experiment confirmed the low mobility of HA-CeO2 NP under more complex environmental conditions. From our experiments, we conclude that the synthetic polymer is more efficient in facilitating NP transport than natural coatings and hence, CeO2 NP mobility may vary significantly depending on the surface coating.
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Affiliation(s)
- Laura Degenkolb
- Section Drinking Water Treatment and Resource Protection, German Environment Agency, Schichauweg 58, 12307 Berlin, Germany
- Department of Soil Science, Institute of Ecology, Berlin University of Technology, Ernst-Reuter Platz 1, 10587 Berlin, Germany
| | - Urs Dippon
- Section Drinking Water Treatment and Resource Protection, German Environment Agency, Schichauweg 58, 12307 Berlin, Germany
| | - Silke Pabst
- Section Drinking Water Treatment and Resource Protection, German Environment Agency, Schichauweg 58, 12307 Berlin, Germany
| | - Sondra Klitzke
- Section Drinking Water Treatment and Resource Protection, German Environment Agency, Schichauweg 58, 12307 Berlin, Germany
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8
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pH dependence of bentonite aggregate size and morphology on polymer-clay flocculation. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Vasti C, Borgiallo A, Giacomelli CE, Rojas R. Layered double hydroxide nanoparticles customization by polyelectrolyte adsorption: mechanism and effect on particle aggregation. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.09.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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10
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Controlled Deposition of Particles in Porous Media for Effective Aquifer Nanoremediation. Sci Rep 2017; 7:12992. [PMID: 29021630 PMCID: PMC5636825 DOI: 10.1038/s41598-017-13423-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 09/21/2017] [Indexed: 01/28/2023] Open
Abstract
In this study, a model assisted strategy is developed to control the distribution of colloids in porous media in the framework of nanoremediation, an innovative environmental nanotechnology aimed at reclaiming contaminated aquifers. This approach is exemplified by the delivery of humic acid-stabilized iron oxide nanoparticles (FeOx), a typical reagent for in situ immobilization of heavy metals. By tuned sequential injections of FeOx suspensions and of solutions containing a destabilizing agent (i.e. calcium or magnesium), the two fronts, which advance at different rates, overlap at the target location (i.e., the central portion) of the porous systems. Here, the particles deposit and accumulate irreversibly, creating a reactive zone. An analytical expression predicting the position of the clustering zone in 1D systems is derived from first principles of advective-dispersive transport. Through this equation, the sequence and duration of the injection of the different solutions in the medium is assessed. The model robustness is demonstrated by its successful application to various systems, comprising the use of different sands or immobilizing cations, both in 1D and 2D geometries. The method represents an advancement in the control of nanomaterial fate in the environment, and could enhance nanoremediation making it an effective alternative to more conventional techniques.
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Wilkinson N, Metaxas A, Brichetto E, Wickramaratne S, Reineke TM, Dutcher CS. Ionic strength dependence of aggregate size and morphology on polymer-clay flocculation. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.085] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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12
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Wiśniewska M, Nowicki P, Nosal-Wiercińska A, Pietrzak R, Szewczuk‐Karpisz K, Ostolska I, Sternik D. Adsorption of poly(acrylic acid) on the surface of microporous activated carbon obtained from cherry stones. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.11.053] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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13
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Pavlovic M, Rouster P, Szilagyi I. Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity. NANOSCALE 2017; 9:369-379. [PMID: 27924343 DOI: 10.1039/c6nr07672f] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Layered double hydroxide (LDH) nanoparticles were prepared and used as solid support for superoxide dismutase (SOD) enzymes. Structural features were studied by XRD, spectroscopic methods (IR, UV-Vis and fluorescence) and TEM, while colloidal stability of the obtained materials was investigated by electrophoresis and light scattering in aqueous dispersions. The SOD quantitatively adsorbed on the LDH by electrostatic and hydrophobic interactions and kept its structural integrity upon immobilization. The composite material showed moderate resistance against salt-induced aggregation in dispersions, therefore, heparin polyelectrolyte was used to improve the colloidal stability of the system. Heparin of highly negative line charge density strongly adsorbed on the oppositely charged hybrid particles leading to charge neutralization and overcharging at appropriate polyelectrolyte loading. Full coverage of the composite platelets with heparin resulted in highly stable dispersions, which contained only primary particles even at elevated ionic strengths. Our results indicate that the developed bionanocomposite of considerable enzymatic function is a suitable candidate for applications, wherever stable dispersions of antioxidant activity are required for instance in biomedical treatments or in chemical manufacturing processes.
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Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, CH-1205 Geneva, Switzerland.
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14
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Bai Y, Li J, Xiong C, Shang X, Wei F, Zhang M. Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media. J Appl Polym Sci 2016. [DOI: 10.1002/app.43447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yingrui Bai
- Research Institute of Petroleum Exploration and Development, PetroChina; Beijing 100083 China
| | - Junjian Li
- China University of Petroleum (Beijing); Beijing 102249 China
| | - Chunming Xiong
- Research Institute of Petroleum Exploration and Development, PetroChina; Beijing 100083 China
| | - Xiaosen Shang
- Research Institute of Petroleum Exploration and Development, PetroChina; Beijing 100083 China
| | - Falin Wei
- Research Institute of Petroleum Exploration and Development, PetroChina; Beijing 100083 China
| | - Miao Zhang
- China University of Petroleum (Beijing); Beijing 102249 China
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15
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Wu Y, Cheng T. Stability of nTiO2 particles and their attachment to sand: Effects of humic acid at different pH. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 541:579-589. [PMID: 26439650 DOI: 10.1016/j.scitotenv.2015.09.116] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/22/2015] [Accepted: 09/22/2015] [Indexed: 06/05/2023]
Abstract
The fate and transport of nano-scale or micro-scale titanium dioxide particles (nTiO2) in subsurface environments are strongly influenced by the stability of nTiO2 and their attachment to sediment grains. nTiO2 may carry either positive or negative charges in natural water, therefore, environmental factors such as pH, humic substances, and Fe oxyhydroxide coatings on sediment grains, which are known to control the stability and transport of negatively-charged colloids, may influence nTiO2 in different manners. The objective of this study is to investigate the effects of pH and humic acid (HA) on the stability and attachment of nTiO2 to sand at HA concentrations that are relevant to typical groundwater conditions, so that mechanisms that control nTiO2 immobilization and transport in natural systems can be elucidated. Stability and attachment of nTiO2 to quartz sand and Fe oxyhydroxide coated quartz sand are experimentally measured under a range of HA concentrations at pH5 and 9. Results show that at pH5, negatively-charged HA strongly adsorbs to positively-charged nTiO2 and Fe oxyhydroxide, which, at low HA concentrations, partially neutralizes the positive charges on nTiO2 and Fe oxyhydroxide, and therefore decreases the repulsive electrostatic forces between the surfaces, resulting in nTiO2 aggregation and attachment. At high HA concentrations, adsorbed HA reverses the surface charges of nTiO2 and Fe oxyhydroxide, and makes nTiO2 and Fe oxyhydroxide strongly negatively charged, resulting in stable nTiO2 suspension and low nTiO2 attachment. At pH9, HA, nTiO2, and Fe oxyhydroxide are all negatively charged, and HA adsorption is low and does not have a strong impact on the stability and attachment of nTiO2. Overall, this study shows that changes in surface charges of nTiO2 and Fe oxyhydroxide coating caused by HA adsorption is a key factor that influences the stability and attachment of nTiO2.
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Affiliation(s)
- Yang Wu
- Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland & Labrador A1B 3X5, Canada
| | - Tao Cheng
- Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland & Labrador A1B 3X5, Canada.
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Schaumann GE, Baumann T, Lang F, Metreveli G, Vogel HJ. Engineered nanoparticles in soils and waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 535:1-2. [PMID: 26087855 DOI: 10.1016/j.scitotenv.2015.06.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Gabriele E Schaumann
- Universität Koblenz-Landau, Institute for Environmental Sciences, Working Group of Environmental and Soil Chemistry, Fortstr. 7, D-76829 Landau, Germany.
| | - Thomas Baumann
- Technische Universität München, Institute of Hydrochemistry, Munich, Germany..
| | - Friederike Lang
- Albert-Ludwigs-Universität Freiburg, Institute of Forest Sciences, Chair of Soil Ecology, 79085 Freiburg i.Br., Germany.
| | - George Metreveli
- Universität Koblenz-Landau, Institute for Environmental Sciences, Working Group of Environmental and Soil Chemistry, Fortstr. 7, D-76829 Landau, Germany.
| | - Hans-Jörg Vogel
- Helmholtz Centre for Environmental Research - UFZ, Department Soil Physics, Theodor-Lieser-Strasse 4, D-06120 Halle, Germany; Martin-Luther-University Halle-Wittenberg, Institute of Soil Science and Plant Nutrition, Von-Seckendorff-Platz 3, 06120 Halle/Saale, Germany.
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17
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Maroni P, Montes Ruiz-Cabello FJ, Cardoso C, Tiraferri A. Adsorbed Mass of Polymers on Self-Assembled Monolayers: Effect of Surface Chemistry and Polymer Charge. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6045-6054. [PMID: 25993382 DOI: 10.1021/acs.langmuir.5b01103] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The adsorbed mass of polymers on surfaces with different chemistry is presented, and the related adsorption mechanism is discussed. Strong and weak polyelectrolytes of negative and positive charge are studied, as well as an uncharged polymer. Self-assembled monolayers of alkanethiols on gold are used in reflectometry and quartz crystal microbalance (QCM-D) experiments as adsorbing substrates bearing different terminal moieties, namely, methyl, hydroxyl, carboxyl, and amine groups. The various polymer-surface combinations allow the systematic investigation of the role of surface chemistry and polymer charge on adsorbed amount. Interactions of different nature and range drive polymer adsorption: the measured adsorbed amounts reveal information about their relative contribution. When electrostatic chain-surface attraction is present, the largest adsorbed masses are observed. However, significant mass is measured even when an electrostatic barrier to adsorption is present, suggesting the importance of forces of nonelectrostatic origin, which include both hydrophobic interactions and specific forces acting at short distances. This mechanism results in large adsorbed amounts for the adsorption of weak polyelectrolytes, and it is apparent especially in the adsorption behavior of a neutral polymer.
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Affiliation(s)
- Plinio Maroni
- †Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Francisco Javier Montes Ruiz-Cabello
- †Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
- ‡Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Fuente Nueva s/n, 18071 Granada, Spain
| | - Catia Cardoso
- †Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Alberto Tiraferri
- †Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
- §Department of Land, Environment and Infrastructure Engineering (DIATI), Polytechnic University of Turin, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
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