1
|
Alsharif N, Viczián D, Szcześ A, Szilagyi I. Formulation of Antioxidant Composites by Controlled Heteroaggregation of Cerium Oxide and Manganese Oxide Nanozymes. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:17201-17212. [PMID: 37674655 PMCID: PMC10478773 DOI: 10.1021/acs.jpcc.3c03964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/17/2023] [Indexed: 09/08/2023]
Abstract
Antioxidant composites based on nanozymes [manganese oxide microflakes (MnO2 MFs) and cerium oxide nanoparticles (CeO2 NPs)] were formulated by controlled heteroaggregation. The interparticle attraction via electrostatic forces was systematically tuned with surface functionalization by the poly(diallyldimethyl chloride) (PDADMAC) polyelectrolyte. The PDADMAC-coated MnO2 MFs (PMn) were heteroaggregated with oppositely charged CeO2 NPs to generate the Ce-PMn composite, while the PDADMAC-functionalized CeO2 NPs (PCe) were immobilized onto bare MnO2 MFs, resulting in the Mn-PCe composite. Both the adsorption of PDADMAC and the self-assembly of oppositely charged particles resulted in charge neutralization and charge reversal at appropriately high doses. The interparticle force regimes, the aggregation states, and the physicochemical properties of the relevant dispersions were also highly dependent on the dose of PDADMAC, as well as that of PDADMAC-functionalized metal oxides (PMO) enabling the fine-tuning and control of colloidal stability. The individual enzyme-like activity of either metal oxide was not compromised by PDADMAC adsorption and/or heteroaggregation, leading to the formation of broad-spectrum antioxidant composites exhibiting multiple enzyme-like activities such as superoxide dismutase, oxidase, and peroxidase-type functions. The low cost and ease of preparation, as well as controllable colloidal properties render such composites potential enzyme mimicking agents in various industrial fields, where processable antioxidant systems are needed.
Collapse
Affiliation(s)
- Nizar
B. Alsharif
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, Interdisciplinary Research Center, University of Szeged, H-6720 Szeged, Hungary
| | - Dániel Viczián
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, Interdisciplinary Research Center, University of Szeged, H-6720 Szeged, Hungary
| | - Aleksandra Szcześ
- Department
of Interfacial Phenomena, Institute of Chemical Sciences, Faculty
of Chemistry, Maria Curie-Skłodowska
University, PL-20031 Lublin, Poland
| | - Istvan Szilagyi
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, Interdisciplinary Research Center, University of Szeged, H-6720 Szeged, Hungary
| |
Collapse
|
2
|
Amer Cid Í, Van Daele L, Dubruel P, Neyts K, Strubbe F. Single-particle electrophoresis for studying the adsorption of cationic polymers onto anionic particles. Electrophoresis 2023; 44:417-430. [PMID: 36412554 DOI: 10.1002/elps.202200209] [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: 08/23/2022] [Revised: 11/02/2022] [Accepted: 12/06/2022] [Indexed: 11/23/2022]
Abstract
Understanding the adsorption of polymers onto particles is crucial for many technological and biomedical applications. Even though polymer adsorption on particles is a dynamic process, most experimental techniques can only study the adsorption indirectly, in equilibrium and on the ensemble level. New analysis methods are required to overcome these limitations. We investigated the use of single-particle electrophoresis to study the adsorption kinetics of cationic polymers onto anionic particles and compared the resulting data to a theoretical model. In this approach, the electrophoretic mobility of single polystyrene (PS) particles, exposed to different concentrations of poly(2-guanidinoethyl methacrylate), was measured as a function of time. The polymer adsorption leads to an electrophoretic mobility change of the PS particle over time, from the initial negative value to a positive value at equilibrium. By fitting the kinetics data to the Langmuir model, the adsorption rate, desorption rate and equilibrium constant were determined. Finally, the adsorption kinetics of several other polymers was investigated. This showed that the presented technique enables direct analysis and comparison of the kinetics of polymer adsorption on the single-particle level.
Collapse
Affiliation(s)
- Íngrid Amer Cid
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
| | - Lenny Van Daele
- Polymer Chemistry and Biomaterials (PBM) research group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Peter Dubruel
- Polymer Chemistry and Biomaterials (PBM) research group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Kristiaan Neyts
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
| | - Filip Strubbe
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
| |
Collapse
|
3
|
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]
|
4
|
Takács D, Péter T, Vargáné Árok Z, Katana B, Papović S, Gadzuric S, Vraneš M, Szilágyi I. Structure-Stability Relationship in Aqueous Colloids of Latex Particles and Gemini Surfactants. J Phys Chem B 2022; 126:9095-9104. [PMID: 36287607 PMCID: PMC9910321 DOI: 10.1021/acs.jpcb.2c06259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The influence of gemini surfactants (GSs) on the charging and aggregation features of anionic sulfate modified latex (SL) particles was investigated by light scattering techniques in aqueous dispersions. The GSs of short alkyl chains (2-4-2 and 4-4-4) resembled simple inert salts and aggregated the particles by charge screening. The adsorption of GSs of longer alkyl chains (8-4-8, 12-4-12, and 12-6-12) on SL led to charge neutralization and overcharging of the particles, giving rise to destabilization and restabilization of the dispersions, respectively. The comparison of the interfacial behavior of dimeric and the corresponding monomeric surfactants revealed that the former shows a more profound influence on the colloidal stability due to the presence of double positively charged head groups and hydrophobic tails, which is favorable to enhancing both electrostatic and hydrophobic particle-GS and GS-GS interactions at the interface. The different extent of the particle-GS interactions was responsible for the variation of the GS destabilization power, following the 2-4-2 < 4-4-4 < 8-4-8 < 12-4-12 order, while the length of the GS spacer did not affect the adsorption and aggregation processes. The valence of the background salts strongly influenced the stability of the SL-GS dispersions through altering the electrostatic interactions, which was more pronounced for multivalent counterions. These findings indicate that both electrostatic and hydrophobic effects play crucial roles in the adsorption of GSs on oppositely charged particles and in the corresponding aggregation mechanism. The major interparticle forces can be adjusted by changing the structure and concentration of the GSs and inorganic electrolytes present in the systems.
Collapse
Affiliation(s)
- Dóra Takács
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Tamás Péter
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Zsófia Vargáné Árok
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Bojana Katana
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Snežana Papović
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - Slobodan Gadzuric
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - Milan Vraneš
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - István Szilágyi
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary,
| |
Collapse
|
5
|
Effect of Water and Salt on the Colloidal Stability of Latex Particles in Ionic Liquid Solutions. COLLOIDS AND INTERFACES 2021. [DOI: 10.3390/colloids6010002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The colloidal stability of sulfate (SL) and polyimidazolium-modified sulfate (SL-IP-2) latex particles was studied in an ionic liquid (IL) of ethylammonium nitrate (EAN) and its water mixtures. Aggregation rates were found to vary systematically as a function of the IL-to-water ratio. Repulsive electrostatic interactions between particles dominated at low IL concentrations, while they were significantly screened at intermediate IL concentrations, leading to destabilization of the dispersions. When the IL concentration was further increased, the aggregation of latex particles slowed down due to the increased viscosity and finally, a striking stabilization was observed in the IL-rich regime close to the pure IL solvent. The latter stabilization is due to the formation of IL layers at the interface between particles and IL, which induce repulsive oscillatory forces. The presence of the added salt in the system affected differently the structure of the interfaces around SL and SL-IP-2 particles. The sign of the charge and the composition of the particle surfaces were found to be the most important parameters affecting the colloidal stability. The nature of the counterions also plays an important role in the interfacial properties due to their influence on the structure of the IL surface layers. No evidence was observed for the presence of long-range electrostatic interactions between the particles in pure ILs. The results indicate that the presence of even low concentrations of water and salt in the system (as undesirable impurities) can strongly alter the interfacial structure and thus, the aggregation mechanism in particle IL dispersions.
Collapse
|
6
|
Vásárhelyi L, Hegedűs T, Sáringer S, Ballai G, Szilágyi I, Kónya Z. Stability of Boron Nitride Nanosphere Dispersions in the Presence of Polyelectrolytes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5399-5407. [PMID: 33878269 PMCID: PMC8280764 DOI: 10.1021/acs.langmuir.1c00656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 03/31/2021] [Indexed: 11/29/2022]
Abstract
Boron nitride nanospheres (BNNSs) were functionalized with polyelectrolytes. The effect of the polyelectrolyte dose and ionic strength on the charging and aggregation properties was investigated. At appropriate polyelectrolyte doses, charge neutralization occurred, whereas by increasing the dose, charge reversal was observed. The complete coating of the particles was indicated by a plateau in the ζ-potential values, which do not change significantly beyond the dose corresponding to the onset of such a plateau. The dispersions were highly aggregated around the charge neutralization point, while at lower or higher doses, the particles were stable. The salt-induced aggregation experiments revealed that the polyelectrolyte coatings contribute to the colloidal stability of the particles, namely, the critical coagulation concentrations deviated from the one determined for bare BNNSs. The presence of electrostatic and steric interparticle forces induced by the adsorbed polyelectrolyte chains was assumed. The obtained results confirm that the comprehensive investigation of the colloidal stability of BNNS particles is crucial to design stable or unstable dispersions and that polyelectrolytes are suitable agents for both stabilization and destabilization of BNNS dispersions, depending on the purpose of their application.
Collapse
Affiliation(s)
- Lívia Vásárhelyi
- Interdisciplinary
Excellence Center, Department of Applied and Environmental Chemistry, University of Szeged, Szeged H-6720, Hungary
| | - Tímea Hegedűs
- Interdisciplinary
Excellence Center, Department of Applied and Environmental Chemistry, University of Szeged, Szeged H-6720, Hungary
| | - Szilárd Sáringer
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, Szeged H-6720, Hungary
| | - Gergő Ballai
- Interdisciplinary
Excellence Center, Department of Applied and Environmental Chemistry, University of Szeged, Szeged H-6720, Hungary
| | - István Szilágyi
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Interdisciplinary
Excellence Center, Department of Applied and Environmental Chemistry, University of Szeged, Szeged H-6720, Hungary
- MTA-SZTE
Reaction Kinetics and Surface Chemistry Research Group, Szeged H-6720, Hungary
| |
Collapse
|
7
|
Katana B, Takács D, Bobbink FD, Dyson PJ, Alsharif NB, Tomšič M, Szilagyi I. Masking specific effects of ionic liquid constituents at the solid-liquid interface by surface functionalization. Phys Chem Chem Phys 2020; 22:24764-24770. [PMID: 33107516 DOI: 10.1039/d0cp02805c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Ion specific effects of ionic liquid (IL) constituents on the surface charge and aggregation properties of two types of particles (positively charged amidine (AL) and polyimidazolium-functionalized sulfate (SL-IP-2) latexes) were investigated in IL solutions containing different anions and the 1-butyl-3-methylimidazolium cation. For the AL systems, the affinity of IL anions to the particle surface followed the sequence chloride < bromide < nitrate < acetate. The critical coagulation concentration values decreased in the same order indicating that ion specific adsorption determines the surface charge density and the extent of the repulsive interparticle forces. In contrast, no tendencies were observed for the SL-IP-2 particles, i.e., both charge and aggregation features were insensitive to the type of anions. This surprising behavior sheds light on that surface functionalization with the polyimidazolium compound effectively masks interfacial ion specific effects. These results indicate new possible routes to the design of processable particle dispersions in ILs irrespective of their composition.
Collapse
Affiliation(s)
- Bojana Katana
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Dóra Takács
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Felix D Bobbink
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Paul J Dyson
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Nizar B Alsharif
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Matija Tomšič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Istvan Szilagyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| |
Collapse
|
8
|
Xu F, Yao Y, Alvarez PJ, Li Q, Fu H, Yin D, Zhu D, Qu X. Specific ion effects on the aggregation behavior of aquatic natural organic matter. J Colloid Interface Sci 2019; 556:734-742. [DOI: 10.1016/j.jcis.2019.09.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 08/30/2019] [Accepted: 09/01/2019] [Indexed: 01/29/2023]
|
9
|
Sáringer S, Akula RA, Szerlauth A, Szilagyi I. Papain Adsorption on Latex Particles: Charging, Aggregation, and Enzymatic Activity. J Phys Chem B 2019; 123:9984-9991. [DOI: 10.1021/acs.jpcb.9b08799] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Szilárd Sáringer
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary
| | - Rita Achieng Akula
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary
| | - Adél Szerlauth
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary
| | - Istvan Szilagyi
- MTA-SZTE Lendület Biocolloids Research Group, Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary
| |
Collapse
|
10
|
Somosi Z, Pavlovic M, Pálinkó I, Szilágyi I. Effect of Polyelectrolyte Mono- and Bilayer Formation on the Colloidal Stability of Layered Double Hydroxide Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E986. [PMID: 30487401 PMCID: PMC6316193 DOI: 10.3390/nano8120986] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 11/14/2018] [Accepted: 11/26/2018] [Indexed: 12/30/2022]
Abstract
Sequential adsorption of polyelectrolytes on nanoparticles is a popular method to obtain thin films after deposition. However, the effect of polyelectrolyte multilayer formation on the colloidal stability of the nanoparticles has not been studied in detail. In the present work, layered double hydroxides (LDH) were synthesized and interaction with oppositely and like-charged polyelectrolytes was investigated. Electrophoretic and light scattering measurements revealed that colloidal stability of LDH can be tuned by adsorption of poly(styrene sulfonate) (PSS) on the oppositely charged LDH surface in appropriate doses and thus, unstable or stable dispersions can be designed. Negatively charged LDH of adsorbed PSS monolayer was obtained and a poly(diallyldimethyl ammonium chloride) (PDADMAC) second layer was systematically built on the particles. The obtained polyelectrolyte bilayer provided high colloidal stability for the LDH-PSS-PDADMAC dispersions due to the presence of repulsive interparticle forces of electrostatic and steric origin. The results provide crucial quantitative information on designing highly stable particle-polyelectrolyte systems for the preparation of thin films or immobilization of guest substances between the layers for delivery processes.
Collapse
Affiliation(s)
- Zoltán Somosi
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
- Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - Marko Pavlovic
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| | - István Pálinkó
- Material and Solution Structure Research Group, Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary.
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
- Interdisciplinary Excellence Centre, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary.
| |
Collapse
|
11
|
Effect of Ionic Compounds of Different Valences on the Stability of Titanium Oxide Colloids. COLLOIDS AND INTERFACES 2018. [DOI: 10.3390/colloids2030032] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Titanium oxide particles of various morphologies have been prepared for applications of scientific or industrial interest in recent decades. Besides development of novel synthetic routes and solid-state characterization of the obtained particles, colloidal stability of titanium oxide dispersions was the focus of numerous research groups due to the high importance of this topic in applications in heterogeneous systems. The influence of dissolved ionic compounds, including monovalent salts, multivalent ions and polyelectrolytes, on the charging and aggregation behaviour of titanium oxide materials of spherical and elongated structures will be discussed in the present review.
Collapse
|
12
|
Xu F, Wei C, Zeng Q, Li X, Alvarez PJJ, Li Q, Qu X, Zhu D. Aggregation Behavior of Dissolved Black Carbon: Implications for Vertical Mass Flux and Fractionation in Aquatic Systems. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:13723-13732. [PMID: 29132211 DOI: 10.1021/acs.est.7b04232] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The fluvial export of dissolved black carbon (DBC) is a major land-ocean flux in the global black carbon cycle, affecting the size of refractory carbon pool in the oceans. The aggregation behavior of DBC is a significant determinant of its transport and vertical mass flux. In this study, the aggregation kinetics and interaction energy of DBC leached from biochar were investigated. DBC was mainly stabilized by hydration force and underwent structural compacting in divalent cation solutions. Na+ and Mg2+ had limited impact on the colloidal stability of DBC due to the strong hydration of these cations. Ca2+ and Ba2+ readily destabilized DBC by forming inner-sphere complexes, reducing its hydrophilicity. Consistently, charge reversal of DBC was observed with high concentrations of Ca2+ and Ba2+. Simulated sunlight exposure led to photo-oxidation of DBC, increasing its colloidal stability. DBC behaved nonconservatively in laboratory mixing experiments using estuary water samples due to aggregation/sedimentation; while model aquatic humic acid behaved conservatively. Our results infer that there is a vertical mass flux of DBC and possible fractionation from the dissolved organic matter pool in the fluvial and estuarine systems, which have been overlooked in efforts to determine global carbon budgets and associated climate change implications.
Collapse
Affiliation(s)
- Fanchao Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Jiangsu 210023, China
| | - Chenhui Wei
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Jiangsu 210023, China
| | - Qingqing Zeng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Jiangsu 210023, China
| | - Xuening Li
- State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology , Beijing 102206, China
| | - Pedro J J Alvarez
- Department of Civil and Environmental Engineering, Rice University , Houston Texas 77005, United States
| | - Qilin Li
- Department of Civil and Environmental Engineering, Rice University , Houston Texas 77005, United States
| | - Xiaolei Qu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Jiangsu 210023, China
| | - Dongqiang Zhu
- School of Urban and Environmental Sciences, Peking University , Beijing 100871, China
| |
Collapse
|
13
|
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]
|
14
|
Rouster P, Pavlovic M, Horváth E, Forró L, Dey SK, Szilagyi I. Influence of Protamine Functionalization on the Colloidal Stability of 1D and 2D Titanium Oxide Nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9750-9758. [PMID: 28829607 DOI: 10.1021/acs.langmuir.7b01815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The colloidal stability of titanium oxide nanosheets (TNS) and nanowires (TiONW) was studied in the presence of protamine (natural polyelectrolyte) in aqueous dispersions, where the nanostructures possessed negative net charge, and the protamine was positively charged. Regardless of their shape, similar charging and aggregation behaviors were observed for both TNS and TiONW. Electrophoretic experiments performed at different protamine loadings revealed that the adsorption of protamine led to charge neutralization and charge inversion depending on the polyelectrolyte dose applied. Light scattering measurements indicated unstable dispersions once the surface charge was close to zero or slow aggregation below and above the charge neutralization point with negatively or positively charged nanostructures, respectively. These stability regimes were confirmed by the electron microscopy images taken at different polyelectrolyte loadings. The protamine dose and salt-dependent colloidal stability confirmed the presence of DLVO-type interparticle forces, and no experimental evidence was found for additional interactions (e.g., patch-charge, hydrophobic, or steric forces), which are usually present in similar polyelectrolyte-particle systems. These findings indicate that the polyelectrolyte adsorbs on the TNS and TiONW surfaces in a flat and extended conformation giving rise to the absence of surface heterogeneities. Therefore, protamine is an excellent biocompatible candidate to form smooth surfaces, for instance in multilayers composed of polyelectrolytes and particles to be used in biomedical applications.
Collapse
Affiliation(s)
- Paul Rouster
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
| | - Marko Pavlovic
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
| | - Endre Horváth
- School of Basic Sciences, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - László Forró
- School of Basic Sciences, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Sandwip K Dey
- Materials Program, School for Engineering of Matter, Transport and Energy, Arizona State University , Tempe, Arizona 85287, United States
| | - Istvan Szilagyi
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
| |
Collapse
|
15
|
San Román I, Galdames A, Alonso ML, Bartolomé L, Vilas JL, Alonso RM. Effect of coating on the environmental applications of zero valent iron nanoparticles: the lindane case. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 565:795-803. [PMID: 27102275 DOI: 10.1016/j.scitotenv.2016.04.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 04/06/2016] [Accepted: 04/06/2016] [Indexed: 06/05/2023]
Abstract
Commercial stabilized slurry of zero-valent iron nanoparticles (nZVI) as well as laboratory-synthesized polymer-stabilized NZVI nanoparticles were used for lindane (γ-hexachlorocyclohexane) degradation studies in aqueous solution. In the present study, polymer-stabilized iron nanoparticles were stabilized using polyethylene glycol (PEG, Mn ~400 and ~950-1050) and polytetrahydrofuran (PTHF, Mn ~650). To study the effectiveness of the different nanoparticles, a quantitative monitorization of lindane degradation by using solid-phase extraction (SPE) and a qualitative measurement of generated volatile by-products by headspace-solid phase microextraction (HS-SPME) followed by GC/MS were carried out. The obtained data were compared and contrasted with the results obtained in previous work. Results showed that the nanoparticles studied in this work possess superior dechlorination performance compared with previous observations. The freshly prepared Fe(0)-PEG400, Fe(0)-PEG1050 and Fe(0)-PTHF exhibited high reactivity during the dechlorination process of lindane in a very short time. The results obtained with the synthesized nanoparticles were similar to those obtained with commercial nanoparticles. However, in all cases reactivity decreased at reaction's late stage. Degradation of lindane by the studied nanoparticles removed 99.9% of the lindane initial concentration after 72h, except for Fe(0)-PTHF nanoparticles, for which the reaction stopped after 5min. In all cases, the reaction followed a second order kinetics. Finally, comparing the results from this study with our previous work, where different nature polymers were considered (Fe(0)-CMC, Fe(0)-PAA and Fe(0)-PAP), more gradual degradation profile of lindane was observed for Fe(0)-PAA and Fe(0)-CMC. It should be noted that in the present case, the reaction of lindane was speeded up with commercial and Fe(0)-PEG nanoparticles. Nevertheless, in the later case, the composition of by-products was affected by the presence of partially degraded intermediates. Taking into account the current technologies, the high removal rates obtained and the acceptable degradation times required, the proposed technology is suitable for its aimed purpose.
Collapse
Affiliation(s)
- I San Román
- Analytical Chemistry Department, Faculty of Science and Technology, University of the Basque Country/EHU, Box 644, 48080 Bilbao, Spain
| | - A Galdames
- Physical Chemistry Department, Faculty of Science and Technology, University of the Basque Country/EHU, 48940 Leioa, Spain
| | - M L Alonso
- Analytical Chemistry Department, Faculty of Science and Technology, University of the Basque Country/EHU, Box 644, 48080 Bilbao, Spain
| | - L Bartolomé
- Central Analysis Service, Faculty of Science and Technology, University of the Basque Country/EHU, Box 644, 48080 Bilbao, Spain
| | - J L Vilas
- Physical Chemistry Department, Faculty of Science and Technology, University of the Basque Country/EHU, 48940 Leioa, Spain
| | - R M Alonso
- Analytical Chemistry Department, Faculty of Science and Technology, University of the Basque Country/EHU, Box 644, 48080 Bilbao, Spain
| |
Collapse
|
16
|
Rouster P, Pavlovic M, Szilagyi I. Improving the stability of titania nanosheets by functionalization with polyelectrolytes. RSC Adv 2016. [DOI: 10.1039/c6ra23707j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Highly stable suspensions of titanate nanosheets were designed by surface functionalization with P(AAm-co-DADMAC) copolymer.
Collapse
Affiliation(s)
- Paul Rouster
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- CH-1205 Geneva
- Switzerland
| | - Marko Pavlovic
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- CH-1205 Geneva
- Switzerland
| | - Istvan Szilagyi
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- CH-1205 Geneva
- Switzerland
| |
Collapse
|
17
|
Tiraferri A, Borkovec M. Probing effects of polymer adsorption in colloidal particle suspensions by light scattering as relevant for the aquatic environment: An overview. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 535:131-140. [PMID: 25434471 DOI: 10.1016/j.scitotenv.2014.11.063] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 11/19/2014] [Accepted: 11/19/2014] [Indexed: 06/04/2023]
Abstract
Modification of particle surfaces by adsorption of polymers is a process that governs particle behavior in aqueous environmental systems. The present article briefly reviews the current understanding of the adsorption mechanisms and the properties of the resulting layers, and it discusses two environmentally relevant cases of particle modification by polymers. In particular, the discussion focuses on the usefulness of methods based on light scattering to probe such adsorbed layers together with the resulting properties of the particle suspensions, and it highlights advantages and disadvantages of these techniques. Measurement of the electrophoretic mobility allows to follow the development of the adsorption layer and to characterize the charge of the modified particles. At saturation, the surface charge is governed by the charge of the adsorbed film. Dynamic light scattering provides information on the film thickness and on the behavior of the modified suspensions. The charge and the structure of the adsorbed layer influence the stability of the particles, as well as the applicability of the classical theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO). This fundamental knowledge is presented in the light of environmental systems and its significance for applied systems is underlined. In particular, the article discusses two examples of environmental processes involving adsorption of polymers, namely, the modification of particles by natural adsorption of humic substances and the tailoring of surface properties of iron-based particles used to remediate contaminated aquifers.
Collapse
Affiliation(s)
- Alberto Tiraferri
- Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland.
| | - Michal Borkovec
- Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| |
Collapse
|
18
|
Aljuboori AHR, Idris A, Al-Joubory HHR, Uemura Y, Ibn Abubakar BSU. Flocculation behavior and mechanism of bioflocculant produced by Aspergillus flavus. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2015; 150:466-471. [PMID: 25560664 DOI: 10.1016/j.jenvman.2014.12.035] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 11/11/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
In this study, the flocculation behavior and mechanism of a cation-independent bioflocculant IH-7 produced by Aspergillus flavus were investigated. Results showed 91.6% was the lowest flocculating rate recorded by IH-7 (0.5 mg L(-1)) at pH range 4-8. Moreover, IH-7 showed better flocculation performance than polyaluminum chloride (PAC) at a wide range of flocculant concentration (0.06-25 mg L(-1)), temperature (5-45 °C) and salinity (10-60% w/w). The current study found that cation addition did not significantly enhance the flocculating rate and IH-7 is a positively charged bioflocculant. These findings suggest that charge neutralization is the main flocculation mechanism of IH-7 bioflocculant. IH-7 was significantly used to flocculate different types of suspended solids such as activated carbons, kaolin clays, soil solids and yeast cells.
Collapse
Affiliation(s)
- Ahmad H Rajab Aljuboori
- Centre for Biofuel and Biochemical Research (CBBR), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia
| | - Azni Idris
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, Sri Serdang 43400, Selangor, Malaysia.
| | | | - Yoshimitsu Uemura
- Centre for Biofuel and Biochemical Research (CBBR), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia
| | - B S U Ibn Abubakar
- Department of Civil and Water Resources Engineering, University of Maiduguri, P.M.B 1069, Maiduguri, Borno State, Nigeria
| |
Collapse
|
19
|
Szabó T, Tóth V, Horváth E, Forró L, Szilagyi I. Tuning the aggregation of titanate nanowires in aqueous dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:42-9. [PMID: 25525741 DOI: 10.1021/la504521e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electrophoretic and dynamic light scattering (DLS) measurements revealed that aggregation in aqueous dispersion of titanate nanowires (TiONWs) can be tuned by poly(diallyldimethylammonium) chloride (PDADMAC) polyelectrolyte. The nanowires possessed negative charge under alkaline conditions which was compensated by the oppositely charged PDADMAC adsorbed on the surface. Such adsorption led to charge neutralization and subsequent charge reversal at the appropriate polyelectrolyte doses. The dispersions were stable at low PDADMAC concentration where the TiONWs possessed negative charge. However, fast aggregation of the nanowires occurred close to the charge neutralization point where the overall charge of the particles was zero. Charge inversion at high polyelectrolyte doses gave rise to restabilization of the samples and slow aggregation of the TiONWs even at higher ionic strengths where the original bare TiONW dispersions were unstable. The colloid stability of the bare nanowires can be explained well qualitatively by the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory; however, polyelectrolyte adsorption led to additional patch-charge attractions and osmotic repulsion between the particles. On the basis of the knowledge generated by the present work, experimental conditions (e.g., salt level, polyelectrolyte, and particle concentrations) can be adjusted in order to design stable and processable aqueous dispersions of TiONWs for further applications.
Collapse
Affiliation(s)
- Tamás Szabó
- Department of Inorganic and Analytical Chemistry, University of Geneva , 1205 Geneva, Switzerland
| | | | | | | | | |
Collapse
|
20
|
Zhuang YZ, Gu WX, Yang JJ, Chen X, Gao H. Supramolecular nanoparticles constructed by balancing the forces between attractive host–guest and repulsive electrostatic interactions in two positively charged polymers. RSC Adv 2015. [DOI: 10.1039/c5ra18031g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel type of supramolecular nanoparticle (SNP) was self-assembled based on the balance of forces including attractive supramolecular host–guest interactions and repulsive electrostatic interactions between the host and the guest polymers.
Collapse
Affiliation(s)
- Yue-Zhu Zhuang
- School of Chemistry and Chemical Engineering
- School of Material Science and Engineering
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin
| | - Wen-Xing Gu
- School of Chemistry and Chemical Engineering
- School of Material Science and Engineering
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin
| | - Jin-Jun Yang
- School of Environmental Science and Safety Engineering
- Tianjin University of Technology
- Tianjin
- China
| | - XiYi Chen
- School of Public Health
- Dalian Medical University
- Dalian
- China
| | - Hui Gao
- School of Chemistry and Chemical Engineering
- School of Material Science and Engineering
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin
| |
Collapse
|
21
|
Investigation of FeCl3 induced coagulation processes using electrophoretic measurement, nanoparticle tracking analysis and dynamic light scattering: Importance of pH and colloid surface charge. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.07.049] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
22
|
Feng L, Adachi Y. Brownian flocculation of negatively charged latex particles with low charge density polycation at various ionic strengths. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
23
|
Szilagyi I, Trefalt G, Tiraferri A, Maroni P, Borkovec M. Polyelectrolyte adsorption, interparticle forces, and colloidal aggregation. SOFT MATTER 2014; 10:2479-2502. [PMID: 24647366 DOI: 10.1039/c3sm52132j] [Citation(s) in RCA: 217] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This review summarizes the current understanding of adsorption of polyelectrolytes to oppositely charged solid substrates, the resulting interaction forces between such substrates, and consequences for colloidal particle aggregation. The following conclusions can be reached based on experimental findings. Polyelectrolytes adsorb to oppositely charged solid substrates irreversibly up to saturation, whereby loose and thin monolayers are formed. The adsorbed polyelectrolytes normally carry a substantial amount of charge, which leads to a charge reversal. Frequently, the adsorbed films are laterally heterogeneous. With increasing salt levels, the adsorbed mass increases leading to thicker and more homogeneous films. Interaction forces between surfaces coated with saturated polyelectrolyte layers are governed at low salt levels by repulsive electric double layer interactions, and particle suspensions are stable under these conditions. At appropriately high salt levels, the forces become attractive, principally due to van der Waals interactions, but eventually also through other forces, and suspensions become unstable. This situation can be rationalized with the classical theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO). Due to the irreversible nature of the adsorption process, stable unsaturated layers form in colloidal particle suspensions at lower polyelectrolyte doses. An unsaturated polyelectrolyte layer can neutralize the overall particle surface charge. Away from the charge reversal point, electric double layer forces are dominant and particle suspensions are stable. As the charge reversal point is approached, attractive van der Waals forces become important, and particle suspensions become unstable. This behaviour is again in line with the DLVO theory, which may even apply quantitatively, provided the polyelectrolyte films are sufficiently laterally homogeneous. For heterogeneous films, additional attractive patch-charge interactions may become important. Depletion interactions may also lead to attractive forces and suspension destabilization, but such interactions become important only at high polyelectrolyte concentrations.
Collapse
Affiliation(s)
- Istvan Szilagyi
- Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland.
| | | | | | | | | |
Collapse
|
24
|
Graña Suárez L, Verboom W, Huskens J. Cyclodextrin-based supramolecular nanoparticles stabilized by balancing attractive host–guest and repulsive electrostatic interactions. Chem Commun (Camb) 2014; 50:7280-2. [DOI: 10.1039/c4cc03136a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multicomponent, negatively charged supramolecular nanoparticles were prepared without the need of a stopper. Their size and stability are controlled owing to a balance of forces between attractive supramolecular and repulsive electrostatic interactions.
Collapse
Affiliation(s)
- Laura Graña Suárez
- Molecular Nanofabrication group
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede, The Netherlands
| | - Willem Verboom
- Molecular Nanofabrication group
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede, The Netherlands
| | - Jurriaan Huskens
- Molecular Nanofabrication group
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede, The Netherlands
| |
Collapse
|
25
|
Baueregger S, Perello M, Plank J. Role of PVOH and kaolin on colloidal stability of liquid and powder EVA and SB latexes in cement pore solution. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.05.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
26
|
Szilagyi I, Polomska A, Citherlet D, Sadeghpour A, Borkovec M. Charging and aggregation of negatively charged colloidal latex particles in the presence of multivalent oligoamine cations. J Colloid Interface Sci 2013; 392:34-41. [DOI: 10.1016/j.jcis.2012.09.058] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 08/06/2012] [Accepted: 09/26/2012] [Indexed: 11/30/2022]
|
27
|
Madurga S, Rey-Castro C, Pastor I, Vilaseca E, David C, Garcés JL, Puy J, Mas F. A semi-grand canonical Monte Carlo simulation model for ion binding to ionizable surfaces: Proton binding of carboxylated latex particles as a case study. J Chem Phys 2011; 135:184103. [DOI: 10.1063/1.3658484] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
28
|
Zhang L, Kitazumi Y, Kakiuchi T. Potential-dependent adsorption and transfer of poly(diallyldialkylammonium) ions at the nitrobenzene|water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:13037-13042. [PMID: 21882879 DOI: 10.1021/la2028077] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Electrochemically driven adsorption and partition of a series of poly(diallyldialkylammonium) ions (PDADAA(+): alkyl = methyl, ethyl, propyl, and butyl) at the nitrobenzene (NB)|water (W) interface have been studied using voltammetry and electrocapillary measurements. When the phase-boundary potential, Δφ, that is, the inner potential of the W phase referred to that of the NB phase, is negative, poly(diallyldimethylammonium) (PDADMA(+)) shows little surface activity. The scanning of Δφ in the positive direction induces, first, the adsorption of PDADMA(+) at the interface and, then, the desorption of adsorbed PDADMA(+) ions into the NB phase, followed by the diffusion-limited transfer of PDADMA(+) from W to NB. The elongation of the dialkyl chains gives the stronger surface activity of PDADAA(+) even when Δφ < 0. The PDADAA(+) polyions studied are only slightly more hydrophilic than the corresponding monomers. However, the polycationic character of PDADAA(+) renders the adsorption, desorption, and ion transfer strongly dependent on Δφ and gives rise to unusual, M-shaped electrocapillary curves. The interplay of adsorption-desorption and ion transfer of PDADAA(+) ions induces the electrochemical instability of the interface and the emulsion formation on the NB side of the interface.
Collapse
Affiliation(s)
- Limin Zhang
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | | | | |
Collapse
|
29
|
Sadeghpour A, Seyrek E, Szilágyi I, Hierrezuelo J, Borkovec M. Influence of the degree of ionization and molecular mass of weak polyelectrolytes on charging and stability behavior of oppositely charged colloidal particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9270-9276. [PMID: 21707034 DOI: 10.1021/la201968b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Positively charged amidine latex particles are studied in the presence of poly(acrylic acid) (PAA) with different molecular masses under neutral and acidic conditions by electrophoresis and time-resolved dynamic light scattering. Under neutral conditions, where PAA is highly charged, the system is governed by the charge reversal induced by the quantitatively adsorbing polyelectrolyte and attractive patch-charge interactions. Under acidic conditions, where PAA is more weakly charged, the following two effects come into play. First, the lateral structure of the adsorbed layers becomes more homogeneous, which weakens the attractive patch-charge interactions. Second, polyelectrolyte adsorption is no longer quantitative and partitioning into the solution phase is observed, especially for PAA of low molecular mass.
Collapse
Affiliation(s)
- Amin Sadeghpour
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
| | | | | | | | | |
Collapse
|
30
|
Finessi M, Sinha P, Szilágyi I, Popa I, Maroni P, Borkovec M. Charge Reversal of Sulfate Latex Particles by Adsorbed Linear Poly(ethylene imine) Probed by Multiparticle Colloidal Probe Technique. J Phys Chem B 2011; 115:9098-105. [DOI: 10.1021/jp203514r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marco Finessi
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Prashant Sinha
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - István Szilágyi
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Ionel Popa
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Plinio Maroni
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Michal Borkovec
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| |
Collapse
|
31
|
Hierrezuelo J, Szilagyi I, Vaccaro A, Borkovec M. Probing Nanometer-Thick Polyelectrolyte Layers Adsorbed on Oppositely Charged Particles by Dynamic Light Scattering. Macromolecules 2010. [DOI: 10.1021/ma1014462] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- José Hierrezuelo
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Istvan Szilagyi
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Andrea Vaccaro
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | - Michal Borkovec
- Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| |
Collapse
|