1
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Yan J, Ma M, Li F. Phosphorus recovery via struvite crystallization in batch and fluidized-bed reactors: Roles of microplastics and dissolved organic matter. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135108. [PMID: 38972202 DOI: 10.1016/j.jhazmat.2024.135108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 07/02/2024] [Accepted: 07/04/2024] [Indexed: 07/09/2024]
Abstract
Struvite crystallization, a promising technology for nutrient recovery from wastewater, is facing considerable challenges due to the presence of emerging contaminants such as microplastics (MPs) ubiquitously found in wastewater. Here, we investigate the roles of MPs and humic acid (HA) in struvite crystallization in batch and fluidized-bed reactors (FBRs) using synthetic and real wastewater with a Mg:N:P molar ratio of 1:3:(1-1.3) at an initial pH of 11. Batch reactor (BR) experiment results show that MPs expedited the nucleation and growth rates of struvite (e.g., the rate of crystal growth in the presence of 30 mg L-1 of polyethylene terephthalate (PET) was 1.43 times higher than that in the blank system), while HA hindered the formation of struvite. X-ray diffraction and the Rietveld refinement analysis revealed that the presence of MPs and HA can result in significant changes in phase compositions of the reclaimed precipitates, with over 80 % purity of struvite found in the precipitates from suspensions in the presence of 30 mg L-1 of MPs. Further characterizations demonstrated that MPs act as seeds of struvite nucleation, spurring the formation of well-defined struvite, while HA favors the formation of newberyite rather than struvite in both reactors. These findings highlight the need for a more comprehensive understanding of the interactions between emerging contaminants and struvite crystallization processes to optimize nutrient recovery strategies for mitigating their adverse impact on the quality and yield of struvite-based fertilizers. ENVIRONMENTAL IMPLICATION: The presence of microplastics in wastewater poses a significant challenge to struvite crystallization for nutrient recovery, as it accelerates nucleation and growth rates of struvite crystals. This can lead to changes in the phase compositions of the reclaimed precipitates, with implications for the quality and yield of struvite-based fertilizers. Additionally, the presence of humic acid hinders the formation of struvite, favoring the formation of other minerals like newberyite. Understanding the interactions between emerging contaminants and struvite crystallization processes is crucial for optimizing nutrient recovery strategies and mitigating the environmental impact of these contaminants on water quality and struvite-based fertilizers.
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Affiliation(s)
- Junna Yan
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Mengyu Ma
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Feihu Li
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China; NUIST Reading Academy, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China.
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2
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Li Y, Yoo S, Bu W, Zhang H, Dutta P. Modifying Specific Ion Effects: Studies of Monovalent Ion Interactions with Amines. J Phys Chem B 2024; 128:6542-6548. [PMID: 38953612 DOI: 10.1021/acs.jpcb.4c02359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Specific ion effects in the interactions of monovalent anions with amine groups─one of the hydrophilic moieties found in proteins─were investigated using octadecylamine monolayers floating at air-aqueous solution interfaces. We find that at solution pH 5.7, larger monovalent anions induce a nonzero pressure starting at higher areas/molecules, i.e., a wider "liquid expanded" region in the monolayer isotherms. Using X-ray fluorescence at near total reflection (XFNTR), an element- and surface-specific technique, ion adsorption to the amines at pH 5.7 is confirmed to be ion-specific and to follow the conventional Hofmeister series. However, at pH 4, this ion specificity is no longer observed. We propose that at the higher pH, the amine headgroups are only partially protonated, and large polarizable ions such as iodine are better able to boost amine protonation. At the lower pH, on the other hand, the monolayer is fully protonated, and electrostatic interactions dominate over ion specificity. These results demonstrate that ion specificity can be modified by changing the experimental conditions.
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Affiliation(s)
- Yanlin Li
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Sangjun Yoo
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Wei Bu
- NSF's ChemMatCARS, University of Chicago, Chicago, Illinois 60637, United States
| | - Honghu Zhang
- NSLS-II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Pulak Dutta
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
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3
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Lau S, Bilodeau CL. Effect of Monovalent Cations on the Structure and Dynamics of Multimodal Chromatographic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:6694-6702. [PMID: 38518252 PMCID: PMC10993413 DOI: 10.1021/acs.langmuir.3c03294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 03/24/2024]
Abstract
While multimodal (MM) chromatography is a promising approach for purifying proteins, the lack of a fundamental understanding of how ion-ligand interactions govern selectivity limits its use in the biopharmaceutical industry. This study uses molecular dynamics simulations to study the interactions between simple monovalent cations and two commonly used structurally similar multimodal chromatography ligands, the Capto ligand and Nuvia cPrime, immobilized on the surface. On the Capto ligand surface, ion presence and type play a key role in modulating the formation of phenyl rings and carboxylate clusters. The flexible linkage attaching the Capto ligand to the self-assembled monolayer (SAM) surface allowed multiple ligands to form interactions with the small cations, while large cations interacted less strongly, following the order Li+ > Na+ > K+ > Cs+. Thus, smaller cations resulted in greater ordering on the surface and lower ion diffusivities, while larger cations resulted in less ordering and higher ion diffusivities, following the order Li+ < Na+ < K+ < Cs+. In contrast, due to the rigid attachment of Nuvia cPrime to the SAM surfaces, the cations bound less strongly and had a much smaller effect on ligand clustering or ordering. Additionally, ions in the presence of the Nuvia cPrime surface had generally greater diffusivities than those in the presence of the Capto ligand. Overall, the interaction of cations with the multimodal ligands can lead to unique configurations on the SAM that likely contribute to differential behavior in biological separations.
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Affiliation(s)
- Sabrina
C. Lau
- Dublin
High School, Dublin, California 94568, United States
| | - Camille L. Bilodeau
- Department
of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22903, United States
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4
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Havemeister F, Ghaeidamini M, Esbjörner EK. Monovalent cations have different effects on the assembly kinetics and morphology of α-synuclein amyloid fibrils. Biochem Biophys Res Commun 2023; 679:31-36. [PMID: 37660641 DOI: 10.1016/j.bbrc.2023.08.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 08/29/2023] [Indexed: 09/05/2023]
Abstract
Formation of α-synuclein amyloid fibrils is a pathological hallmark of Parkinson's disease and a phenomenon that is strongly modulated by environmental factors. Here, we compared effects of different monovalent cations (Li+, Na+, K+) on the formation and properties of α-synuclein amyloid fibrils. Na+ > Li+ were found to have concentration-dependent catalytic effects on primary nucleation whereas K+ ions acted inhibitory. We discuss this discrepancy in terms of a superior affinity of Na+ and Li+ to carboxylic protein groups, resulting in reduced Columbic repulsion and by considering K+ as an ion with poor protein binding and slight chaotropic character, which could promote random coil protein structure. K+ ions, furthermore, appeared to lower the β-sheet content of the fibrils and increase their persistence lengths, the latter we interpret as a consequence of lesser ion binding and hence higher line charge of the fibrils. The finding that Na+ and K+ have opposite effects on α-synuclein aggregation is intriguing in relation to the significant transient gradients of these ions across axonal membranes, but also important for the design and interpretation of biophysical assays where buffers containing these monovalent cations have been intermixedly used.
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Affiliation(s)
- Fritjof Havemeister
- Division of Chemical Biology, Department of Life Sciences, Chalmers University of Technology, Kemivägen 10, S-41296, Gothenburg, Sweden
| | - Marziyeh Ghaeidamini
- Division of Chemical Biology, Department of Life Sciences, Chalmers University of Technology, Kemivägen 10, S-41296, Gothenburg, Sweden
| | - Elin K Esbjörner
- Division of Chemical Biology, Department of Life Sciences, Chalmers University of Technology, Kemivägen 10, S-41296, Gothenburg, Sweden.
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5
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Grava M, Ibrahim M, Sudarsan A, Pusterla J, Philipp J, Rädler JO, Schwierz N, Schneck E. Combining molecular dynamics simulations and x-ray scattering techniques for the accurate treatment of protonation degree and packing of ionizable lipids in monolayers. J Chem Phys 2023; 159:154706. [PMID: 37861119 DOI: 10.1063/5.0172552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 09/25/2023] [Indexed: 10/21/2023] Open
Abstract
The pH-dependent change in protonation of ionizable lipids is crucial for the success of lipid-based nanoparticles as mRNA delivery systems. Despite their widespread application in vaccines, the structural changes upon acidification are not well understood. Molecular dynamics simulations support structure prediction but require an a priori knowledge of the lipid packing and protonation degree. The presetting of the protonation degree is a challenging task in the case of ionizable lipids since it depends on pH and on the local lipid environment and often lacks experimental validation. Here, we introduce a methodology of combining all-atom molecular dynamics simulations with experimental total-reflection x-ray fluorescence and scattering measurements for the ionizable lipid Dlin-MC3-DMA (MC3) in POPC monolayers. This joint approach allows us to simultaneously determine the lipid packing and the protonation degree of MC3. The consistent parameterization is expected to be useful for further predictive modeling of the action of MC3-based lipid nanoparticles.
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Affiliation(s)
- Miriam Grava
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Mohd Ibrahim
- Institute of Physics, University of Augsburg, Augsburg, Germany
| | - Akhil Sudarsan
- Institute of Physics, University of Augsburg, Augsburg, Germany
| | - Julio Pusterla
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Julian Philipp
- Fakultät für Physik, Ludwig-Maximilians-Universität München (LMU), München, Germany
| | - Joachim O Rädler
- Fakultät für Physik, Ludwig-Maximilians-Universität München (LMU), München, Germany
| | - Nadine Schwierz
- Institute of Physics, University of Augsburg, Augsburg, Germany
| | - Emanuel Schneck
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
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6
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Obstbaum T, Sivan U. Charge regulation indicates water expulsion from silica surface by cesium cations. J Colloid Interface Sci 2023; 638:825-833. [PMID: 36791480 DOI: 10.1016/j.jcis.2023.02.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 01/29/2023] [Accepted: 02/02/2023] [Indexed: 02/08/2023]
Abstract
HYPOTHESIS Since the discovery of the Hofmeister effect in 1888, the varied propensity of ions to proteins, DNA and other surfaces has motivated research aimed at deciphering the underlying ion specific adsorption mechanism. Experimental and numerical studies have shown that in agreement with Collins' heuristic law of matching water affinity, weakly hydrated (chaotropic) ions adsorb preferentially to hydrophobic surfaces. Here, we show that this preference is driven by expulsion of bound water molecules from the surface by the adsorbing ions. EXPERIMENTS Using AFM spectroscopy of the force acting between two silica surfaces, we characterize surface charge regulation by adsorbed Na+ and Cs+ ions at different salt concentrations, pH values and temperatures. These data are analyzed in the framework of a recent theory of charge regulation, relating it to change in surface entropy. FINDINGS Upon binding to the silica, cesium cations expel water molecules from the surface to create additional adsorption sites for more ions. Cs+ adsorption is thus driven by the release of hydrating water molecules and the resulting increased surface entropy. The model indicates that on average, the binding of three cesium cations releases enough water molecules to make room for two additional bound cations. Na+ does not exhibit such behavior.
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Affiliation(s)
- Tal Obstbaum
- Department of Physics and the Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Uri Sivan
- Department of Physics and the Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa 3200003, Israel.
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7
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Tamagawa H, Nakahata T, Sugimori R, Delalande B, Mulembo T. The Membrane Potential Has a Primary Key Equation. Acta Biotheor 2023; 71:15. [PMID: 37148457 DOI: 10.1007/s10441-023-09467-5] [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: 05/31/2022] [Accepted: 04/17/2023] [Indexed: 05/08/2023]
Abstract
It is common to say that the origin of the membrane potential is attributed to transmembrane ion transport, but it is theoretically possible to explain its generation by the mechanism of ion adsorption. It has been previously suggested that the ion adsorption mechanism even leads to potential formulae identical to the famous Nernst equation or the Goldman-Hodgkin-Katz equation. Our further analysis, presented in this paper, indicates that the potential formula based on the ion adsorption mechanism leads to an equation that is a function of the surface charge density of the material and the surface potential of the material. Furthermore, we have confirmed that the equation holds in all the different experimental systems that we have studied. This equation appears to be a key equation that governs the characteristics of the membrane potential in all systems.
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Affiliation(s)
- Hirohisa Tamagawa
- Department of Mechanical Engineering, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
| | - Toi Nakahata
- Department of Mechanical Engineering, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Ren Sugimori
- Department of Mechanical Engineering, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | | | - Titus Mulembo
- Mechatronic Engineering Department, Dedan Kimathi University of Technology DEKUT, Nyeri, Kenya
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8
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He X, Ewing AG. Hofmeister Series: From Aqueous Solution of Biomolecules to Single Cells and Nanovesicles. Chembiochem 2023; 24:e202200694. [PMID: 37043703 DOI: 10.1002/cbic.202200694] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/30/2023] [Indexed: 04/14/2023]
Abstract
Hofmeister effects play a critical role in numerous physicochemical and biological phenomena, including the solubility and/or accumulation of proteins, the activities of enzymes, ion transport in biochannels, the structure of lipid bilayers, and the dynamics of vesicle opening and exocytosis. This minireview focuses on how ionic specificity affects the physicochemical properties of biomolecules to regulate cellular exocytosis, vesicular content, and nanovesicle opening. We summarize recent progress in further understanding Hofmeister effects on biomacromolecules and their applications in biological systems. These important steps have increased our understanding of the Hofmeister effects on cellular exocytosis, vesicular content, and nanovesicle opening. Increasing evidence is firmly establishing that the ions along the Hofmeister series play an important role in living organisms that has often been ignored.
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Affiliation(s)
- Xiulan He
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 41296, Gothenburg, Sweden
| | - Andrew G Ewing
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 41296, Gothenburg, Sweden
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9
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Nickerson TR, Antonio EN, McNally DP, Toney MF, Ban C, Straub AP. Unlocking the potential of polymeric desalination membranes by understanding molecular-level interactions and transport mechanisms. Chem Sci 2023; 14:751-770. [PMID: 36755730 PMCID: PMC9890600 DOI: 10.1039/d2sc04920a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 12/09/2022] [Indexed: 12/15/2022] Open
Abstract
Polyamide reverse osmosis (PA-RO) membranes achieve remarkably high water permeability and salt rejection, making them a key technology for addressing water shortages through processes including seawater desalination and wastewater reuse. However, current state-of-the-art membranes suffer from challenges related to inadequate selectivity, fouling, and a poor ability of existing models to predict performance. In this Perspective, we assert that a molecular understanding of the mechanisms that govern selectivity and transport of PA-RO and other polymer membranes is crucial to both guide future membrane development efforts and improve the predictive capability of transport models. We summarize the current understanding of ion, water, and polymer interactions in PA-RO membranes, drawing insights from nanofiltration and ion exchange membranes. Building on this knowledge, we explore how these interactions impact the transport properties of membranes, highlighting assumptions of transport models that warrant further investigation to improve predictive capabilities and elucidate underlying transport mechanisms. We then underscore recent advances in in situ characterization techniques that allow for direct measurements of previously difficult-to-obtain information on hydrated polymer membrane properties, hydrated ion properties, and ion-water-membrane interactions as well as powerful computational and electrochemical methods that facilitate systematic studies of transport phenomena.
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Affiliation(s)
- Trisha R Nickerson
- Department of Chemical and Biological Engineering, University of Colorado Boulder Boulder CO 80309 USA
| | - Emma N Antonio
- Department of Chemical and Biological Engineering, University of Colorado Boulder Boulder CO 80309 USA
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA
| | - Dylan P McNally
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA
| | - Michael F Toney
- Department of Chemical and Biological Engineering, University of Colorado Boulder Boulder CO 80309 USA
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA
- Renewable and Sustainable Energy Institute, University of Colorado Boulder Boulder CO 80309 USA
| | - Chunmei Ban
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA
- Department of Mechanical Engineering, University of Colorado Boulder Boulder CO 80309 USA
| | - Anthony P Straub
- Materials Science and Engineering Program, University of Colorado Boulder Boulder CO 80309 USA
- Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder Boulder Colorado 80309 USA
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10
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Loh WW, Huang M, Goh L, Lim CC, Goh R, Lin Q, Guo L, Loh XJ, Lim JYC. A Polyanionic Tartrate-containing Temperature-responsive Hydrogel. Chem Asian J 2022; 17:e202200621. [PMID: 35945646 DOI: 10.1002/asia.202200621] [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: 06/13/2022] [Revised: 07/29/2022] [Indexed: 11/08/2022]
Abstract
Thermogels, a class of hydrogels which show spontaneous sol-gel phase transition when warmed, are an important class of soft biomaterials. To date, however, most amphiphilic polymers that are able to form thermogels in aqueous solution are uncharged, and the influence of ionisable groups on thermogelation are largely unknown. Herein, we report the first example of a polyanionic amphiphilic multi-block copolymer, containing multiple pendant carboxylate groups, that can form transparent thermogels spontaneously when warmed up to physiological temperature. We demonstrate that introducing negative charges onto thermogelling polymers could significantly alter the properties of the micelles and thermogels formed. Furthermore, the polymer's polyanionic character provides new options for modulating the gel rheological properties, such as stiffness and gelation temperatures, through electrostatic interactions with different cations. We also demonstrated the polyanionic thermogel allowed slower sustained release of a cationic model drug compound compared to an anionic one over 2 weeks. The findings from our study demonstrate exciting new possibilities for advanced biomedical applications using charged polyelectrolyte thermogel materials.
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Affiliation(s)
- Wei Wei Loh
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Miao Huang
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Leonard Goh
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Chen Chuan Lim
- Institute of Sustainability for Chemicals Energy and Environment, SIA, SINGAPORE
| | - Rubayn Goh
- Institute of Materials Research and Engineering, Strategic Research Initiative, SINGAPORE
| | - Qianyu Lin
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Liangfeng Guo
- Institute of Sustainability for Chemicals Energy and Environment, SIA, SINGAPORE
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, Soft Materials, SINGAPORE
| | - Jason Yuan Chong Lim
- Institute of Materials Research and Engineering, Soft Materials, 2 Fusionopolis Way, Innovis, 138634, Singapore, SINGAPORE
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11
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Schmid P, Hohenschutz M, Graß X, Witzmann M, Touraud D, Diat O, Pfitzner A, Bauduin P. Counterion effect on α-Keggin polyoxometalates in water: The peculiar role of H+ on their salting-in effect and co-assembly with organics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Yang S, Wen G, Pispas S, You K. Aggregation behavior of symmetric poly(
n
‐butyl acrylate)‐
block
‐poly(acrylic acid) on subphases of different ionic strengths. J Appl Polym Sci 2022. [DOI: 10.1002/app.52641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shicheng Yang
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering Harbin University of Science and Technology Harbin People's Republic of China
| | - Gangyao Wen
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering Harbin University of Science and Technology Harbin People's Republic of China
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute National Hellenic Research Foundation Athens Greece
| | - Kun You
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering Harbin University of Science and Technology Harbin People's Republic of China
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13
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Asakereh I, Lee K, Francisco OA, Khajehpour M. Hofmeister Effects of Group II Cations as Seen in the Unfolding of Ribonuclease A. Chemphyschem 2022; 23:e202100884. [PMID: 35421259 DOI: 10.1002/cphc.202100884] [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: 12/14/2021] [Revised: 04/14/2022] [Indexed: 11/06/2022]
Abstract
This work studies the effects of alkaline-earth cation addition upon the unfolding free energy of a model protein, pancreatic Ribonuclease A (RNase A) by DSC analysis. RNase A was chosen because it: a) does not specifically bind Mg 2+ , Ca 2+ and Sr 2+ cations and b) maintains its structural integrity throughout a large pH range. We have measured and compared the effects of NaCl, MgCl 2 , CaCl 2 and SrCl 2 addition on the melting point of RNase A. Our results show that even though the addition of group II cations to aqueous solvent reduces the solubility of nonpolar residues (and enhances the hydrophobic effect), their interactions with the amide moieties are strong enough to "salt-them-in" the solvent, thereby causing an overall reduction in protein stability. We demonstrate that amide-cation interactions are a major contributor to the observed "Hofmeister Effects" of group II cations in protein folding. Our analysis suggests that protein folding "Hofmeister Effects" of group II cations, are mostly the aggregate sum of how cation addition simultaneously salts-out hydrophobic moieties through increasing the cavitation free energy, while promoting the salting-in of amide moieties through contact pair formation.
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Affiliation(s)
- Iman Asakereh
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Katherine Lee
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Olga A Francisco
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Mazdak Khajehpour
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, R3T2N2, Winnipeg, CANADA
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14
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Nguyen CV, Peng M, Duignan TT, Nguyen AV. Salting-Up of Surfactants at the Surface of Saline Water as Detected by Tensiometry and SFG and Supported by Molecular Dynamics Simulation. J Phys Chem B 2022; 126:1063-1075. [PMID: 35103476 DOI: 10.1021/acs.jpcb.1c08114] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surfactant adsorption at the air-water interface is critical to many industrial processes but its dependence on salt ions is still poorly understood. Here, we investigate the adsorption of sodium dodecanoate onto the air-water interface using model saline waters of Li+ or Cs+ at pH values 8 and 11. Both cations enhance the surfactant adsorption, as expected, but their largest effects on the adsorption also depend on pH. Specifically, surface tension measurements, sum-frequency generation spectroscopy, and microelectrophoresis show that small (hard) Li+ enhances the surfactant adsorption more than large (soft) Cs+ at pH 11. This effect is fully reversed at pH 8. We argue that this salting-up (increasing adsorption) reversal is attributable to the conversion of the neutralized carboxylic (-COOH) headgroup at pH 8 into the charged carboxylate (-COO-) headgroup at pH 11, which, respectively, interact with Cs+ and Li+ favorably. Molecular dynamics simulation shows that the affinity of Cs+ to the interface is decreased and eventually overtaken by Li+ as the carboxylic groups are deprotonated. This study highlights the importance of the charge and size of salt ions in selecting surfactants and electrolytes for industrial applications.
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Affiliation(s)
- Cuong V Nguyen
- School of Chemical Engineering and ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals (UQ Node), The University of Queensland, Brisbane, QLD 4072, Australia
| | - Mengsu Peng
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Timothy T Duignan
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Anh V Nguyen
- School of Chemical Engineering and ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals (UQ Node), The University of Queensland, Brisbane, QLD 4072, Australia
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15
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Walden K, Martin ME, LaBee L, Provorse Long M. Hydration and Charge-Transfer Effects of Alkaline Earth Metal Ions Binding to a Carboxylate Anion, Phosphate Anion, and Guanine Nucleobase. J Phys Chem B 2021; 125:12135-12146. [PMID: 34706195 DOI: 10.1021/acs.jpcb.1c05757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To investigate the ability of alkaline earth metal ions to tune ion-mediated DNA adsorption, hydrated Mg2+, Ca2+, Sr2+, and Ba2+ ions bound to a carboxylate anion, phosphate anion, and guanine nucleobase were modeled using density functional theory (DFT) and a combined explicit and continuum solvent model. The large first solvation shell of Ba2+ requires a larger solute cavity defined by a solvent-accessible surface, which is used to model all hydrated ions. Alkaline earth metal ions bind indirectly or directly to each binding site. DFT binding energies decrease with increasing ion size, which is likely due to ion size and hydration structure, rather than quantum effects such as charge transfer. However, charge transfer explains weaker ion binding to guanine compared to phosphate or carboxylate. Overall, carboxylate and phosphate anions are expected to compete equally for hydrated Mg2+, Ca2+, Sr2+, and Ba2+ ions and larger alkaline earth metal ions may induce weaker ion-mediated adsorption. The ion size and hydration structure of alkaline earth metal ions may effectively tune ion-mediated adsorption processes, such as DNA adsorption to functionalized surfaces.
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Affiliation(s)
- Kathryn Walden
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
| | - Madison E Martin
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
| | - Lacey LaBee
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
| | - Makenzie Provorse Long
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
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16
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Sthoer AA, Tyrode EC. Anion Specific Effects at Negatively Charged Interfaces: Influence of Cl -, Br -, I -, and SCN - on the Interactions of Na + with the Carboxylic Acid Moiety. J Phys Chem B 2021; 125:12384-12391. [PMID: 34705447 PMCID: PMC8591606 DOI: 10.1021/acs.jpcb.1c07758] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 10/10/2021] [Indexed: 11/30/2022]
Abstract
Unlike counterion interactions with charged interfaces, the influence of co-ions is only scarcely reported in the literature. In this work, the effect of SCN- and the halide co-ions in the interactions of Na+ with carboxylic acid Langmuir monolayers is investigated by using vibrational sum frequency spectroscopy. At 1 M concentrations in the subphase, the identity of the anion is shown to have a remarkable influence on the charging behavior and degree of deprotonation of the monolayer, with ions ordering in the sequence I- > SCN- > Cl- ≈ Br-. The same trend is observed at both pH 6 and pH 9 when the monolayer is intrinsically more charged. Spectroscopic evidence is found for both the presence of I- and SCN- in the interfacial region at levels close to their detection limits. The results contradict electrostatic theories on charged interfaces where co-ions are not expected to play any significant role. The higher propensity for the large polarizable anions to deprotonate the monolayer is explained in terms of their ability to modify the cations affinity toward the carboxylic acid groups present at the surface.
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Affiliation(s)
- Adrien
P. A. Sthoer
- Department of Chemistry, KTH, Dröttning Kristinas väg 51, SE-10044 Stockholm, Sweden
| | - Eric C. Tyrode
- Department of Chemistry, KTH, Dröttning Kristinas väg 51, SE-10044 Stockholm, Sweden
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17
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An improved perm-selectivity prediction of forward osmosis membrane by incorporating the effect of the surface charge on the solute partitioning. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119303] [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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18
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Jiang K, Wen G, Skandalis A, Pispas S, Ding Y, Chen H. Influences of subphase pH and temperature on the interfacial aggregation behavior of poly(lauryl methacrylate)-block-poly(methacrylic acid). Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Špadina M, Dourdain S, Rey J, Bohinc K, Pellet-Rostaing S, Dufrêche JF, Zemb T. How acidity rules synergism and antagonism in liquid–liquid extraction by lipophilic extractants—Part II: application of the ienaic modelling. SOLVENT EXTRACTION AND ION EXCHANGE 2021. [DOI: 10.1080/07366299.2021.1899614] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- M. Špadina
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
- Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - S. Dourdain
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - J. Rey
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - K. Bohinc
- Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | | | | | - T. Zemb
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
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20
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Peng M, Duignan TT, Nguyen CV, Nguyen AV. From Surface Tension to Molecular Distribution: Modeling Surfactant Adsorption at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2237-2255. [PMID: 33559472 DOI: 10.1021/acs.langmuir.0c03162] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Surfactants are centrally important in many scientific and engineering fields and are used for many purposes such as foaming agents and detergents. However, many challenges remain in providing a comprehensive understanding of their behavior. Here, we provide a brief historical overview of the study of surfactant adsorption at the air-water interface, followed by a discussion of some recent advances in this area from our group. The main focus is on incorporating an accurate description of the adsorption layer thickness of surfactant at the air-water interface. Surfactants have a wide distribution at the air-water interface, which can have a significant effect on important properties such as the surface excess, surface tension, and surface potential. We have developed a modified Poisson-Boltzmann (MPB) model to describe this effect, which we outline here. We also address the remaining challenges and future research directions in this area. We believe that experimental techniques, modeling, and simulation should be combined to form a holistic picture of surfactant adsorption at the air-water interface.
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Affiliation(s)
- Mengsu Peng
- School of Chemical Engineering, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Timothy T Duignan
- School of Chemical Engineering, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Cuong V Nguyen
- School of Chemical Engineering, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Anh V Nguyen
- School of Chemical Engineering, University of Queensland, Brisbane, Queensland 4072, Australia
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21
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Johnson EC, Gresham IJ, Prescott SW, Nelson A, Wanless EJ, Webber GB. The direction of influence of specific ion effects on a pH and temperature responsive copolymer brush is dependent on polymer charge. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123287] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Acharyya A, Mukherjee D, Gai F. Assessing the Effect of Hofmeister Anions on the Hydrogen-Bonding Strength of Water via Nitrile Stretching Frequency Shift. J Phys Chem B 2020; 124:11783-11792. [PMID: 33346656 DOI: 10.1021/acs.jpcb.0c06299] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The temperature dependence of the peak frequency (νmax) of the C≡N stretching vibrational spectrum of a hydrogen-bonded C≡N species is known to be a qualitative measure of its hydrogen-bonding strength. Herein, we show that within a two-state framework, this dependence can be analyzed in a more quantitative manner to yield the enthalpy and entropy changes (ΔHHB and ΔSHB) for the corresponding hydrogen-bonding interactions. Using this method, we examine the effect of ten common anions on the strength of the hydrogen-bond(s) formed between water and the C≡N group of an unnatural amino acid, p-cyanophenylalanine (PheCN). We find that based on the ΔHHB values, these anions can be arranged in the following order: HPO42- > OAc- > F- > SO42- ≈ Cl- ≈ (H2O) ≈ ClO4- ≈ NO3- > Br- > SCN- ≈ I-, which differs from the corresponding Hofmeister series. Because PheCN has a relatively small size, the finding that anions having very different charge densities (e.g., SO42- and ClO4-) act similarly suggests that this ranking order is likely the result of specific ion effects. Since proteins contain different backbone and side-chain units, our results highlight the need to assess their individual contributions toward the overall Hofmeister effect in order to achieve a microscopic understanding of how ions affect the physical and chemical properties of such macromolecules. In addition, the analytical method described in the present study is applicable for analyzing the spectral evolution of any vibrational spectra composed of two highly overlapping bands.
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Affiliation(s)
- Arusha Acharyya
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Debopreeti Mukherjee
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Feng Gai
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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23
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Panuganti V, Roy I. Oligomers, fibrils and aggregates formed by alpha-synuclein: role of solution conditions. J Biomol Struct Dyn 2020; 40:4389-4398. [PMID: 33292065 DOI: 10.1080/07391102.2020.1856721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The classical Hofmeister series orders ions into kosmotropes and chaotropes, based on their interaction with the solvent, water. The role of protein is mostly ignored probably because most of the proteins studied are natively folded and broadly follow this classification pattern. Recent reports suggest that the interaction of ions is different with solvent molecules of proximal layer and bulk. Intrinsically disordered proteins (IDPs) differ from globular proteins in the fraction of polar vis-à-vis hydrophobic amino acids and the absence of distinct secondary and tertiary structures. The kosmotrope, ammonium sulphate, increases the compactness of the polypeptide conformation, with differing effects for globular proteins and IDPs. For globular proteins, lowered flexibility corresponds to a more stable native structure. Using oligomer-specific and aggregation-specific antibodies and comparing with fibrillation results, we show for alpha-synuclein, an IDP, ammonium sulphate-induced compaction results in the formation of the aggregation-prone hydrophobic core, which combines with other similar moieties to form the fibrillar 'seed'. SEC-HPLC and SAXS analysis show the presence of the threshold oligomers. In the presence of the aggregation suppressor, arginine too, an oligomer is formed. This oligomer, however, is 'dead', and does not move further along the aggregation pathway. Thus, alpha-synuclein undergoes compaction in the presence of protein stabilisers, with differing consequences. In case of the chaotropes, KSCN and urea, aggregation of alpha-synuclein is partially inhibited. However, the amounts and types of aggregates formed are different in the two cases. Thus, the classical catalogue of molecules into protein stabilisers and destabilisers requires a relook for IDPs.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Venkataharsha Panuganti
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
| | - Ipsita Roy
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, S.A.S. Nagar, Punjab, India
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24
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Miranda‐Quintana RA, Smiatek J. Theoretical Insights into Specific Ion Effects and Strong-Weak Acid-Base Rules for Ions in Solution: Deriving the Law of Matching Solvent Affinities from First Principles. Chemphyschem 2020; 21:2605-2617. [PMID: 32975891 PMCID: PMC7756232 DOI: 10.1002/cphc.202000644] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/21/2020] [Indexed: 12/02/2022]
Abstract
We present a detailed study of specific ion effects, volcano plots and the law of matching solvent affinities by means of a conceptual density functional theory (DFT) approach. Our results highlight that specific ion effects and the corresponding implications on the solvation energy are mainly due to differences in the electric chemical potentials and chemical hardnesses of the ions and the solvent. Our approach can be further used to identify reliable criteria for the validity of the law of matching solvent affinities. Basic expressions are derived, which allow us to study the limiting conditions for this empirical observation with regard to matching chemical reactivity indices. Moreover, we show that chaotropic and kosmotropic concepts and their implications for the stability of ion pairs are directly related to a generalized strong and weak acids and bases (SWAB) principle for ions in solution, which is also applicable to rationalize the shape of volcano plots for different solvents. In contrast to previous assumptions, all empirical findings can be explained by the properties of local solvent-ion complexes which dominate the specific global behavior of ion pairs in solution.
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Affiliation(s)
| | - Jens Smiatek
- Institut für ComputerphysikUniversität Stuttgart70569StuttgartGermany
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25
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Ota C, Fukuda Y, Tanaka SI, Takano K. Spectroscopic Evidence of the Salt-Induced Conformational Change around the Localized Electric Charges on the Protein Surface of Fibronectin Type III. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14243-14254. [PMID: 33197316 DOI: 10.1021/acs.langmuir.0c02367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The effect of salt on the electrostatic interaction of a protein is an important issue, because addition of salt affects protein stability and association/aggregation. Although adding salt is a generally recognized strategy to improve protein stability, this improvement does not necessarily occur. The lack of an effect upon the addition of salt was previously confirmed for the tenth fibronectin type III domain from human fibronectin (FN3) by thermal stability analysis. However, the detailed molecular mechanism is unknown. In the present study, by employing the negatively charged carboxyl triad on the surface of FN3 as a case study, the molecular mechanism of the inefficient NaCl effect on protein stability was experimentally addressed using spectroscopic methods. Complementary analysis using Raman spectroscopy and 8-anilino-1-naphthalenesulfonic acid fluorescence revealed the three-phase behavior of the salt-protein interaction between NaCl and FN3 over a wide salt concentration range from 100 mM to 4.0 M, suggesting that the Na+-specific binding to the negatively charged carboxyl triad causes a local conformational change around the binding site with an accompanying structural change in the overall protein, which contributes to the protein's structural destabilization. This spectroscopic evidence clarifies the molecular understanding of the inefficiency of salt to improve protein stability. The findings will inform the optimization of formulation conditions.
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Affiliation(s)
- Chikashi Ota
- College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Yui Fukuda
- Department of Biomolecular Chemistry, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan
| | - Shun-Ichi Tanaka
- Department of Biomolecular Chemistry, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan
| | - Kazufumi Takano
- Department of Biomolecular Chemistry, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan
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26
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Mestdagh JM, Poisson L. Excited State Dynamics of Isolated 6- and 8-Hydroxyquinoline Molecules. Chemphyschem 2020; 21:2605-2613. [PMID: 33022865 DOI: 10.1002/cphc.202000626] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/05/2020] [Indexed: 11/09/2022]
Abstract
The photoinduced dynamics of isolated n-hydroxyquinoline (nHQ) molecules (n=6,8) was investigated in femtosecond pump-probe experiments. A qualitative difference was found between 8HQ and 6HQ. After an initial rapid decay corresponding to the departure of the initial wavepacket out of the Franck-Condon region of the excitation, the 8HQ probe signal decays to zero in 0.37 ps whereas a much longer time constant of 10.4 ps is observed in 6HQ. This interrogates on the role played by the intramolecular H-bond N · · · HO which is at play the 8HQ molecule. Ab-initio were performed at the MCSCF/aug-cc-pVDZ level on the 8HQ molecule to help the discussion. A complex energy landscape was found, which includes a conical intersection.
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Affiliation(s)
- Jean-Michel Mestdagh
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191, Gif-sur-Yvette, France
| | - Lionel Poisson
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191, Gif-sur-Yvette, France
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27
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Nielen WM, Willott JD, Esguerra ZM, de Vos WM. Ion specific effects on aqueous phase separation of responsive copolymers for sustainable membranes. J Colloid Interface Sci 2020; 576:186-194. [DOI: 10.1016/j.jcis.2020.04.125] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/28/2020] [Accepted: 04/29/2020] [Indexed: 01/09/2023]
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28
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Gong L, Shi S, Lv N, Xu W, Ye Z, Gao B, O'Carroll DM, He F. Sulfidation enhances stability and mobility of carboxymethyl cellulose stabilized nanoscale zero-valent iron in saturated porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 718:137427. [PMID: 32105934 DOI: 10.1016/j.scitotenv.2020.137427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 02/13/2020] [Accepted: 02/17/2020] [Indexed: 06/10/2023]
Abstract
Sulfidation can enhance the reactivity and longevity of nanoscale zero-valent iron (nZVI), but little is known about its effect on the fate and transport of nZVI in saturated porous media. This work compared the stability and mobility of carboxymethyl cellulose (CMC) stabilized nZVI (CMC-nZVI) and sulfidated nZVI (CMC-S-nZVI) particles in saturated porous media. After sulfidation, the hydrodynamic size of CMC-S-nZVI was 100-150 nm larger than CMC-nZVI due to enhanced adsorption of CMC onto the S-nZVI surface, which was facilitated by the bidentate bridging interaction between CMC and the FeSx phase on S-nZVI. Of note is that they had a similar core size and zeta potential. In comparison to CMC-nZVI, CMC-S-nZVI exhibited less physical settling (0-5% vs. 5-73%) and chemical dissolution (2-10% vs. 3-27%) within 55 min under the same ionic conditions (Na+, K+ < 200 mM; Al3+ < 0.75 mM). Column breakthrough experiments showed that both CMC-S-nZVI and CMC-nZVI had relatively high mobility in saturated porous media. However, CMC-S-nZVI exhibited greater breakthrough (C/C0 = 0.57-1.0) and corresponding greater mass recovery rates than the corresponding CMC-nZVI (C/C0 = 0.44-1.0) under most of the experimental conditions (e.g., different ion type and concentration, flow rate, and input concentration). The fitted colloid filtration theory model was in good agreement with experiments. This work suggests that in addition to the significant reactivity and longevity improvements demonstrated in other studies, CMC-S-nZVI is also more mobile than CMC-nZVI suggesting that CMC-S-nZVI has many of the characteristics favorable for field application.
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Affiliation(s)
- Li Gong
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Shasha Shi
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Neng Lv
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Wenqiang Xu
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Ziwei Ye
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States
| | - Denis M O'Carroll
- School of Civil and Environmental Engineering, Connected Water Initiative, University of New South Wales, Manly Vale, New South Wales 2093, Australia
| | - Feng He
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
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29
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Smiatek J. Specific Ion Effects and the Law of Matching Solvent Affinities: A Conceptual Density Functional Theory Approach. J Phys Chem B 2020; 124:2191-2197. [PMID: 32105071 DOI: 10.1021/acs.jpcb.9b10886] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We study the principles behind specific ion effects of alkali and halide ions in various protic and aprotic solvents by means of a conceptual density functional theory (DFT) approach. The results of our calculations are in good agreement with experimental data and underline the crucial role of frontier molecular orbital energies. Further analysis reveals that the electronegativities and chemical hardness values of the considered ion and solvent species provide a molecular rationale for specific ion effects and the law of matching water affinities. Based on the analytical expressions and DFT calculations, we show that solvent affinities and the occurrence of specific ion effects, among other molecular mechanisms and interactions, are mainly due to electronegativity differences between the ions and the surrounding solvent molecules.
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Affiliation(s)
- Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
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30
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Rios-Carvajal T, Bovet N, Bechgaard K, Stipp SLS, Hassenkam T. Effect of Divalent Cations on the Interaction of Carboxylate Self-Assembled Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16153-16163. [PMID: 31722180 DOI: 10.1021/acs.langmuir.9b02694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Interactions between organic molecules in aqueous environments, whether in the fluid phase or adsorbed on solids, are often affected by the cations present in the solution. We investigated, at nanometer scale, how surface carboxylate interactions are influenced by dissolved divalent cations: Mg2+, Ca2+, Sr2+, and Ba2+. Self-assembled monolayer (SAM) surfaces with exposed terminations of alkyl, -CH3, carboxylate, -COO- , or dicarboxylate, -DiCOO-, were deposited on gold-coated tips and substrates. We used atomic force microscopy (AFM), in chemical force mapping (CFM) mode, to measure adhesion forces between various combinations of SAMs on the tip and substrate, in solutions of 0.5 M NaCl, that contained 0.012 M of one of the divalent cations. The type of cation, the number of carboxyl groups that interact, and their structure on the SAM influenced adhesion between the surfaces. The effect of the reference solution, which only contains Na+ cations, on adhesion force was mainly attributed to van der Waals and hydrophobic forces, explaining the lower force in systems that are more hydrophilic, i.e., -COO--COO-, and higher force for more hydrophobic systems. For charged surfaces, i.e., -COO- and -DiCOO-, in divalent cation solutions results were consistent with ion bridging. The inclusion of a hydrophobic surface, i.e., the -CH3-COO- or -CH3-DiCOO- system, decreased the possibility for strong cation bridging with the charged surface, resulting in lower adhesion. For systems including -COO-, the adhesion force series followed the inverse cation hydrated radius trend (Na+ ≈ Mg2+ < Sr2+ < Ca2+ < Ba2+) whereas -DiCOO- was responsible for lower adhesion force and modified trends, depending on the corresponding surface in the system. Differences in force magnitude between the monolayers were correlated with lower charge availability on the -DiCOO- surface as a result of fewer active sites, probably because of the tendency of exposed malonate surface groups to interact between them, as well as high rigidity, resulting from the molecule structure. The characteristic response of the -DiCOO- surface in solutions of Sr2+ and Ca2+ was correlated with possible malonate complexation modes. Comparison with previous studies suggested that the strong response of a -DiCOO- surface to Sr2+ resulted from bidentate chelation, whereas Ca2+ response was attributed to alpha-mode association to malonate.
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Affiliation(s)
| | | | | | | | - T Hassenkam
- Nano-Science Center, Department of Chemistry , University of Copenhagen , Copenhagen 1017 , Denmark
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31
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The Hofmeister series: Specific ion effects in aqueous polymer solutions. J Colloid Interface Sci 2019; 555:615-635. [PMID: 31408761 DOI: 10.1016/j.jcis.2019.07.067] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/23/2019] [Accepted: 07/24/2019] [Indexed: 12/21/2022]
Abstract
Specific ion effects in aqueous polymer solutions have been under active investigation over the past few decades. The current state-of-the-art research is primarily focused on the understanding of the mechanisms through which ions interact with macromolecules and affect their solution stability. Hence, we herein first present the current opinion on the sources of ion-specific effects and review the relevant studies. This includes a summary of the molecular mechanisms through which ions can interact with polymers, quantification of the affinity of ions for the polymer surface, a thermodynamic description of the effects of salts on polymer stability, as well as a discussion on the different forces that contribute to ion-polymer interplay. Finally, we also highlight future research issues that call for further scrutiny. These include fundamental questions on the mechanisms of ion-specific effects and their correlation with polymer properties as well as a discussion on the specific ion effects in more complex systems such as mixed electrolyte solutions.
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32
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Sthoer A, Hladílková J, Lund M, Tyrode E. Molecular insight into carboxylic acid-alkali metal cations interactions: reversed affinities and ion-pair formation revealed by non-linear optics and simulations. Phys Chem Chem Phys 2019; 21:11329-11344. [PMID: 31107479 DOI: 10.1039/c9cp00398c] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Specific interactions between the carboxylic acid moiety and the monovalent salts CsCl, NaCl, and LiCl, have been investigated in Langmuir monolayers using vibrational sum frequency spectroscopy (VSFS) and complemented with coarse grained and all-atom molecular dynamics simulations. By exploiting VSFS's intrinsic surface specificity, an emphasis was made on targeting headgroup vibrations of both its charged and uncharged forms as well as water molecules in the interfacial layer. The degree of deprotonation of the monolayer as a function of cation concentration and pH was experimentally determined and theoretically rationalized. Starting from 100 mM, the surface charge was overestimated by the Gouy-Chapman model and varied depending on the identity of the cation, highlighting the appearance of ion specific effects. Agreement could be found using a modified Poisson-Boltzmann model that takes into account steric effects, with a fitted effective ion-size compatible with the hydrated ion diameters. The relative affinity of the cations to the carboxylic acid moiety was pH dependent: at pH 4.5 they arranged in the order Cs+ > Na+ > Li+, but fully reversed (Li+ > Na+ > Cs+) at pH 9. Simulations yielded microscopic insight into the origin of this behavior, with the cations showing contrasting interaction preferences for either the uncharged carboxylic acid or the charged carboxylate. Sum frequency spectra also provided evidence that all cations remained hydrated when interacting with the charged headgroup, forming solvent-separated or solvent-shared ion pairs. However, for the specific case of 1 M Li+ at pH 9, contact ion pairs were formed. Finally, the remarkable effect of trace metal multivalent cations in the interpretation of experiments is briefly discussed. The results provide exciting new insights into the complex interactions of alkali metal cations with the biophysically relevant carboxylic acid moiety.
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Affiliation(s)
- Adrien Sthoer
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
| | - Jana Hladílková
- Division of Theoretical Chemistry, Lund University, P.O.B. 124, SE-22100 Lund, Sweden
| | - Mikael Lund
- Division of Theoretical Chemistry, Lund University, P.O.B. 124, SE-22100 Lund, Sweden
| | - Eric Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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33
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Trewby W, Faraudo J, Voïtchovsky K. Long-lived ionic nano-domains can modulate the stiffness of soft interfaces. NANOSCALE 2019; 11:4376-4384. [PMID: 30801089 DOI: 10.1039/c8nr06339g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal ions underpin countless processes at bio-interfaces, including maintaining electroneutrality, modifying mechanical properties and driving bioenergetic activity. These processes are typically described by ions behaving as independently diffusing point charges. Here we show that Na+ and K+ ions instead spontaneously form correlated nanoscale networks that evolve over seconds at the interface with an anionic bilayer in solution. Combining single-ion level atomic force microscopy and molecular dynamic simulations we investigate the configuration and dynamics of Na+, K+, and Rb+ at the lipid surface. We identify two distinct ionic states: the well-known direct electrostatic interaction with lipid headgroups and a water-mediated interaction that can drive the formation of remarkably long-lived ionic networks which evolve over many seconds. We show that this second state induces ionic network formation via correlative ion-ion interactions that generate an effective energy well of -0.4kBT/ion. These networks locally reduce the stiffness of the membrane, providing a spontaneous mechanism for tuning its mechanical properties with nanoscale precision. The ubiquity of water-mediated interactions suggest that our results have far-reaching implications for controlling the properties of soft interfaces.
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Affiliation(s)
- William Trewby
- University of Durham, Physics Department, Durham DH1 3LE, UK.
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34
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Schlaich A, Dos Santos AP, Netz RR. Simulations of Nanoseparated Charged Surfaces Reveal Charge-Induced Water Reorientation and Nonadditivity of Hydration and Mean-Field Electrostatic Repulsion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:551-560. [PMID: 30571136 DOI: 10.1021/acs.langmuir.8b03474] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We perform atomistic simulations of nanometer-separated charged surfaces in the presence of monovalent counterions at fixed water chemical potential. The counterion density profiles are well described by a modified Poisson-Boltzmann (MPB) approach that accounts for nonelectrostatic ion-surface interactions, while the effects of smeared-out surface-charge distributions and dielectric profiles are found to be relatively unimportant. The simulated surface interactions are for weakly charged surfaces well described by the additive contributions of hydration and MPB repulsions, but already for a moderate surface charge density of σ = -0.77 e/nm2 this additivity breaks down. This we rationalize by a combination of different effects, namely, counterion correlations as well as the surface charge-induced reorientation of hydration water, which modifies the effective water dielectric constant as well as the hydration repulsion.
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Affiliation(s)
- Alexander Schlaich
- Laboratoire Interdisciplinaire de Physique, CNRS and Université Grenoble Alpes, UMR CNRS 5588, 38000 Grenoble , France
- Fachbereich Physik , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Alexandre P Dos Santos
- Fachbereich Physik , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
- Instituto de Física , Universidade Federal do Rio Grande do Sul , CEP 91501-970, 15051 Porto Alegre , Brazil
| | - Roland R Netz
- Fachbereich Physik , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
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35
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Cui X, Hartanto Y, Wu C, Bi J, Dai S, Zhang H. Tuning microenvironment for multicellular spheroid formation in thermo‐responsive anionic microgel scaffolds. J Biomed Mater Res A 2018; 106:2899-2909. [DOI: 10.1002/jbm.a.36479] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 05/26/2018] [Accepted: 06/01/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Xiaolin Cui
- School of Chemical Engineering the University of Adelaide Adelaide Australia
| | - Yusak Hartanto
- School of Chemical Engineering the University of Adelaide Adelaide Australia
| | - Chengtie Wu
- Biomaterials and Tissue Engineering Research Centre, Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai China
| | - Jingxiu Bi
- School of Chemical Engineering the University of Adelaide Adelaide Australia
| | - Sheng Dai
- School of Chemical Engineering and Advanced Materials Newcastle University Newcastle‐upon‐Tyne United Kingdom
| | - Hu Zhang
- School of Chemical Engineering the University of Adelaide Adelaide Australia
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36
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Rios-Carvajal T, Pedersen NR, Bovet N, Stipp SLS, Hassenkam T. Specific Ion Effects on the Interaction of Hydrophobic and Hydrophilic Self-Assembled Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10254-10261. [PMID: 30085678 DOI: 10.1021/acs.langmuir.8b01720] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Interactions between mineral surfaces and organic molecules are fundamental to life processes. The presence of cations in natural environments can change the behavior of organic compounds and thus alter the mineral-organic interfaces. We investigated the influence of Na+, Mg2+, Ca2+, Sr2+, and Ba2+ on the interaction between two models, self-assembled monolayers, that were tailored to have hydrophobic -CH3 or hydrophilic -COO(H) terminations. Atomic force microscopy in chemical force mapping mode, where the tips were functionalized with the same terminations, was used to measure adhesion forces between the tip and substrate surfaces, to gather fundamental information about the role of these cations in the behavior of organic compounds and the surfaces where they adsorb. Adhesion force between hydrophobic surfaces in 0.5 M NaCl solutions that contained 0.012 M divalent cations did not change, regardless of the ionic potential, that is, the charge per unit radius, of the cation. For systems where one or the other surface was functionalized with carboxylate, -COO(H), mostly in its deprotonated form, -COO-, a reproducible change in the adhesion force was observed for each of the ions. The trend of increasing adhesion force followed the pattern: Na+ ≈ Mg2+ < Sr2+ < Ca2+ < Ba2+, suggesting that ionic potential, thus hydrated radius, controls the interaction. The presence of a -CH3 surface in the asymmetric system leads to lower adhesion forces than in the hydrophilic system, whereas the ionic trend remains the same. Although specific ion effects are felt in both systems, the lower adhesion force in the asymmetric system, compared with the hydrophilic system, implies that the -CH3 surface plays an important role.
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Affiliation(s)
- T Rios-Carvajal
- Nano-Science Center, Department of Chemistry , University of Copenhagen , 2100 Copenhagen , Denmark
| | - N R Pedersen
- Nano-Science Center, Department of Chemistry , University of Copenhagen , 2100 Copenhagen , Denmark
| | - N Bovet
- Nano-Science Center, Department of Chemistry , University of Copenhagen , 2100 Copenhagen , Denmark
| | - S L S Stipp
- Nano-Science Center, Department of Chemistry , University of Copenhagen , 2100 Copenhagen , Denmark
| | - T Hassenkam
- Nano-Science Center, Department of Chemistry , University of Copenhagen , 2100 Copenhagen , Denmark
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37
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Narayanan Krishnamoorthy A, Holm C, Smiatek J. Specific ion effects for polyelectrolytes in aqueous and non-aqueous media: the importance of the ion solvation behavior. SOFT MATTER 2018; 14:6243-6255. [PMID: 30009285 DOI: 10.1039/c8sm00600h] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present the results of atomistic molecular dynamics simulations with regard to specific ion effects in water, methanol and N,N-dimethylacetamide (DMAc). As a reference system, we introduce rigid and rod-like models of polyanions and polycations in combination with alkali metal cations and halide anions as counterions. Pronounced specific ion effects can be observed in terms of the individual anion and cation condensation behavior. The outcomes of our simulations thus reveal significant deviations from standard electrostatic mean-field theories. A detailed investigation of the individual energy contributions shows that ion-dipole interactions play a pivotal role in rationalizing the findings. The corresponding deviations in terms of the cation and anion distribution can be brought into agreement with the donor and acceptor numbers of the solvents, which thus highlights the importance of solvent-ion interactions in addition to electrostatic attraction.
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38
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Affiliation(s)
| | - Shenda M. Baker
- Synedgen Inc.; 1420 N. Claremont Blvd., Suite 105D Claremont CA 91711 USA
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39
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Kaulen C, Simon U. Ion specific effects on the immobilisation of charged gold nanoparticles on metal surfaces. RSC Adv 2018; 8:1717-1724. [PMID: 35540875 PMCID: PMC9077124 DOI: 10.1039/c7ra10374c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 12/19/2017] [Indexed: 12/25/2022] Open
Abstract
Since the pioneering work of F. Hofmeister, Arch. Exp. Pathol. Pharmakol., 1888, 24, 247, ion specific effects have been steadily reported in the context of colloidal or protein stabilisation in electrolyte solutions. Although the observed effects are omnipresent in chemistry and biology, their origin is still under ferocious discussion. Here, we report on ion specific effects affecting the self-assembly of amine and carboxylic acid functionalised gold nanoparticles on metal surfaces as well as in electrolyte solution as a function of the monovalent cations Li+, Na+, K+ and Cs+. Mercaptooctanoic acid and 1,8-amine-octanethiol functionalised gold nanoparticles were adsorbed on structured AuPd/Pt substrates under addition of the respective chloride salts. Furthermore, the influence of the same salts on the salt induced aggregation of these AuNP was investigated. Our results demonstrate that the assembly processes on the metal surface as well as in electrolyte solution are influenced by the addition of different cations. We attribute the observed effects to ion pairing of the functional end groups with the added cations. With these findings we introduce a new parameter to control the self-assembly of 2D AuNP arrays on solid supports or of 3D AuNP networks in solution, which could be of relevance for the fabrication of new tailor-made functional materials or for biomedical applications.
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Affiliation(s)
- C Kaulen
- JARA - FIT, RWTH Aachen University 52074 Aachen Germany
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany
| | - U Simon
- JARA - FIT, RWTH Aachen University 52074 Aachen Germany
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany
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40
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Schaeffer N, Passos H, Gras M, Mogilireddy V, Leal JP, Pérez-Sánchez G, Gomes JRB, Billard I, Papaiconomou N, Coutinho JAP. Mechanism of ionic-liquid-based acidic aqueous biphasic system formation. Phys Chem Chem Phys 2018; 20:9838-9846. [DOI: 10.1039/c8cp00937f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
This work represents a major contribution to the understanding of ionic liquid-based acidic aqueous biphasic system formation and application.
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Affiliation(s)
- Nicolas Schaeffer
- CICECO
- Department of Chemistry
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | - Helena Passos
- CICECO
- Department of Chemistry
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | - Matthieu Gras
- LEPMI – Universite Grenoble-Alpes
- F-38000 Grenoble
- France
| | | | - João P. Leal
- C2TN
- DECN
- Instituto Superior Técnico
- Universidade de Lisboa
- 2695-066 Bobadela
| | - Germán Pérez-Sánchez
- CICECO
- Department of Chemistry
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | - José R. B. Gomes
- CICECO
- Department of Chemistry
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
| | | | | | - João A. P. Coutinho
- CICECO
- Department of Chemistry
- University of Aveiro
- Campus Universitário de Santiago
- 3810-193 Aveiro
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41
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A Systematic Analysis and Review of the Fundamental Acid-Base Properties of Biosorbents. ENVIRONMENTAL CHEMISTRY FOR A SUSTAINABLE WORLD 2018. [DOI: 10.1007/978-3-319-92111-2_3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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42
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Investigation of Hofmeister effects in ultra-dilute solutions at the water/silica interface using electrokinetic current generation. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.10.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Hjörleifsson JG, Ásgeirsson B. pH-Dependent Binding of Chloride to a Marine Alkaline Phosphatase Affects the Catalysis, Active Site Stability, and Dimer Equilibrium. Biochemistry 2017; 56:5075-5089. [DOI: 10.1021/acs.biochem.7b00690] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jens G. Hjörleifsson
- Department of Biochemistry,
Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | - Bjarni Ásgeirsson
- Department of Biochemistry,
Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
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44
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Davis RD, Tolbert MA. Crystal nucleation initiated by transient ion-surface interactions at aerosol interfaces. SCIENCE ADVANCES 2017; 3:e1700425. [PMID: 28776032 PMCID: PMC5517112 DOI: 10.1126/sciadv.1700425] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 06/15/2017] [Indexed: 05/03/2023]
Abstract
Particle collisions are a common occurrence in the atmosphere, but no empirical observations exist to fully predict the potential effects of these collisions on air quality and climate projections. The current consensus of heterogeneous crystal nucleation pathways relevant to the atmosphere dictates that collisions with amorphous particles have no effect on the crystallization relative humidity (RH) of aqueous inorganic aerosols because there is no stabilizing ion-surface interaction to facilitate the formation of crystal nuclei. In contrast to this view of heterogeneous nucleation, we report laboratory observations demonstrating that collisions with hydrophobic amorphous organic aerosols induced crystallization of aqueous inorganic microdroplets at high RH, the effect of which was correlated with destabilizing water-mediated ion-specific surface interactions. These same organic aerosols did not induce crystallization once internally mixed in the droplet, pointing toward a previously unconsidered transient ion-specific crystal nucleation pathway that can promote aerosol crystallization via particle collisions.
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Affiliation(s)
- Ryan D. Davis
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, CO 80309, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Boulder, CO 80309, USA
| | - Margaret A. Tolbert
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, CO 80309, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Boulder, CO 80309, USA
- Corresponding author.
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45
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Kobayashi K, Liang Y, Murata S, Matsuoka T, Takahashi S, Nishi N, Sakka T. Ion Distribution and Hydration Structure in the Stern Layer on Muscovite Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3892-3899. [PMID: 28355074 DOI: 10.1021/acs.langmuir.7b00436] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Based on molecular dynamics simulations of eight ions (Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, and Ba2+) on muscovite mica surfaces in water, we demonstrate that experimental data on the muscovite mica surface can be rationalized through a unified picture of adsorption structures including the hydration structure, cation heights from the muscovite surface, and state stability. These simulations enable us to categorize the inner-sphere surface complex into two different species: an inner-sphere surface complex in a ditrigonal cavity (IS1) and that on top of Al (IS2). By considering the presence of the two inner-sphere surface complexes, the experimental finding that the heights of adsorbed cations from the muscovite surface are proportional to the ionic radius for K+ and Cs+ but inversely proportional to the ionic radius for Ca2+ and Ba2+ was explained. We find that Na+, Ca2+, Sr2+, and Ba2+ can form both IS1 and IS2; K+, Rb+, and Cs+ can form only IS1; and Mg2+ can form only IS2. It is suggested that the formation of IS1 and IS2 is governed by the charge density of the ions. Among the eight ions, we also find that the hydration structure for the outer-sphere surface complexes of divalent cations differs from that of the monovalent cations by one adsorbed water molecule (i.e., a water molecule located in a ditrigonal cavity).
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Affiliation(s)
- Kazuya Kobayashi
- Department of Energy and Hydrocarbon Chemistry, Kyoto University , Kyoto 615-8510, Japan
- Environment and Resource System Engineering, Kyoto University , Kyoto 615-8540, Japan
| | - Yunfeng Liang
- Environment and Resource System Engineering, Kyoto University , Kyoto 615-8540, Japan
- Center for Engineering, Research into Artifacts (RACE), The University of Tokyo , Kashiwa, Chiba 277-8568, Japan
| | - Sumihiko Murata
- Environment and Resource System Engineering, Kyoto University , Kyoto 615-8540, Japan
| | - Toshifumi Matsuoka
- Environment and Resource System Engineering, Kyoto University , Kyoto 615-8540, Japan
- Fukada Geological Institute , Tokyo 113-0021, Japan
| | - Satoru Takahashi
- Japan Oil, Gas and Metals National Corporation (JOGMEC) , Chiba, Chiba 261-0025, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Kyoto University , Kyoto 615-8510, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Kyoto University , Kyoto 615-8510, Japan
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46
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Kalyuzhnyi YV, Vlachy V. Explicit-water theory for the salt-specific effects and Hofmeister series in protein solutions. J Chem Phys 2017; 144:215101. [PMID: 27276970 DOI: 10.1063/1.4953067] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Effects of addition of salts on stability of aqueous protein solutions are studied theoretically and the results are compared with experimental data. In our approach, all the interacting species, proteins, ions, and water molecules, are accounted for explicitly. Water molecules are modeled as hard spheres with four off-center attractive square-well sites. These sites serve to bind either another water or to solvate the ions or protein charges. The ions are represented as charged hard spheres, and decorated by attractive sites to allow solvation. Spherical proteins simultaneously possess positive and negative groups, represented by charged hard spheres, attached to the surface of the protein. The attractive square-well sites, mimicking the protein-protein van der Waals interaction, are located on the surface of the protein. To obtain numerical results, we utilized the energy route of Wertheim's associative mean spherical approximation. From measurable properties, we choose to calculate the second virial coefficient B2, which is closely related to the tendency of proteins to aggregate and eventually crystalize. Calculations are in agreement with experimental trends: (i) For low concentration of added salt, the alkali halide salts follow the inverse Hofmeister series. (ii) At higher concentration of added salt, the trend is reversed. (iii) When cations are varied, the salts follow the direct Hofmeister series. (iv) In contrast to the colloidal theories, our approach correctly predicts the non-monotonic behavior of B2 upon addition of salts. (v) With respect to anions, the theory predicts for the B2 values to follow different sequences below and above the iso-ionic point, as also confirmed experimentally. (vi) A semi-quantitative agreement between measured and calculated values for the second virial coefficient, as functions of pH of solution and added salt type and concentration, is obtained.
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Affiliation(s)
- Yuriy V Kalyuzhnyi
- Institute for Condensed Matter Physics, NASU, Svientsitskoho 1, 79011 Lviv, Ukraine
| | - Vojko Vlachy
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
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47
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Ben Jabrallah S, Malloggi F, Belloni L, Girard L, Novikov D, Mocuta C, Thiaudière D, Daillant J. Electrolytes at interfaces: accessing the first nanometers using X-ray standing waves. Phys Chem Chem Phys 2016; 19:167-174. [PMID: 27929155 DOI: 10.1039/c6cp06888j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ion-surface interactions are of high practical importance in a wide range of technological, environmental and biological problems. In particular, they ultimately control the electric double layer structure, hence the interaction between particles in aqueous solutions. Despite numerous achievements, progress in their understanding is still limited by the lack of experimental determination of the surface composition with appropriate resolution. Tackling this challenge, we have developed a method based on X-ray standing waves coupled to nano-confinement which allows the determination of ion concentrations at a solid-solution interface with a sub-nm resolution. We have investigated mixtures of KCl/CsCl and KCl/KI in 0.1 mM to 10 mM concentrations on silica surfaces and obtained quantitative information on the partition of ions between bulk and Stern layer as well as their distribution in the Stern layer. Regarding partition of potassium ions, our results are in agreement with a recent AFM study. We show that in a mixture of KCl and KI, chloride ions exhibit a higher surface propensity than iodide ions, having a higher concentration within the Stern layer and being on average closer to the surface by ≈1-2 Å, in contrast to the solution water interface. Confronting such data with molecular simulations will lead to a precise understanding of ionic distributions at aqueous interfaces.
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Affiliation(s)
- Soumaya Ben Jabrallah
- Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif sur Yvette Cedex, France.
| | - Florent Malloggi
- Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif sur Yvette Cedex, France.
| | - Luc Belloni
- Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif sur Yvette Cedex, France.
| | - Luc Girard
- ICSM UMR 5257 - CEA/CNRS/UM/ENSCM, Site de Marcoule, Bâtiment 426 BP 17171 F-30207 Bagnols sur Cèze Cedex, France
| | - Dmitri Novikov
- Deutsches Elektronensynchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Cristian Mocuta
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Dominique Thiaudière
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Jean Daillant
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
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48
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Abstract
Specific ion binding by carboxylates (-COO-) is a broadly important topic because -COO- is one of the most common functional groups coordinated to metal ions in metalloproteins and synthetic polymers. We apply quantum chemical methods and the quasi-chemical free-energy theory to investigate how variations in the number of -COO- ligands in a binding site determine ion-binding preferences. We study a series of monovalent (Li+, Na+, K+, Cs+) and divalent (Zn2+, Ca2+) ions relevant to experimental work on ion channels and ionomers. Of two competing hypotheses, our results support the ligand field strength hypothesis and follow the reverse Hofmeister series for ion solvation and ion transfer from aqueous solution to binding sites with the preferred number of ligands. New insight arises from the finding that ion-binding sequences can be manipulated and even reversed just by constraining the number of carboxylate ligands in the binding sites. Our results help clarify the discrepancy in ion association between molecular ligands in aqueous solutions and ionomers, and their chemical analogues in ion-channel binding sites.
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Affiliation(s)
- Mark J Stevens
- Center for Integrated Nanotechnologies and ‡Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Susan L B Rempe
- Center for Integrated Nanotechnologies and ‡Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
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49
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Wei S, Chen M, Wei C, Huang N, Li L. Opposite counter-ion effects on condensed bundles of highly charged supramolecular nanotubes in water. SOFT MATTER 2016; 12:6285-6292. [PMID: 27373802 DOI: 10.1039/c6sm00902f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Although ion specificity in aqueous solutions is well known, its manifestation in unconventional strong electrostatic interactions remains implicit. Herein, the ionic effects in dense packing of highly charged polyelectrolytes are investigated in supramolecular nanotube prototypes. Distinctive behaviors of the orthorhombic arrays composed of supramolecular nanotubes in various aqueous solutions were observed by Small Angle X-ray Scattering (SAXS), depending on the counter-ions' size and affiliation to the surface -COO(-) groups. Bigger tetra-alkyl ammonium (TAA(+)) cations weakly bonding to -COO(-) will compress the orthorhombic arrays, while expansion is induced by smaller alkaline metal (M(+)) ions with strong affiliation to -COO(-). Careful analysis of the changes in the SAXS peaks with different counter/co-ion combinations indicates dissimilar mechanisms underlying the two explicit types of ionic effects. The pH measurements are in line with the ion specificity by SAXS and reveal the strong electrostatic character of the system. It is proposed that the small distances between the charged surfaces, in addition to the selective adsorption of counter-ions by the surface charge, bring out the observed distinctive ionic effects. Our results manifest the diverse mechanisms and critical roles of counter-ion effects in strong electrostatic interactions.
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Affiliation(s)
- Shenghui Wei
- National Synchrotron Radiation Lab, University of Science and Technology of China, Hefei, China.
| | - Mingming Chen
- National Synchrotron Radiation Lab, University of Science and Technology of China, Hefei, China.
| | - Chengsha Wei
- Department of Polymer Science and Engineering, CAS Key Lab of Soft Matter Chemistry, University of Science and Technology of China, Hefei, China
| | - Ningdong Huang
- National Synchrotron Radiation Lab, University of Science and Technology of China, Hefei, China.
| | - Liangbin Li
- National Synchrotron Radiation Lab, University of Science and Technology of China, Hefei, China. and Department of Polymer Science and Engineering, CAS Key Lab of Soft Matter Chemistry, University of Science and Technology of China, Hefei, China
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50
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Ions interacting in solution: Moving from intrinsic to collective properties. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.05.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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