101
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Di Profio P, Germani R, Fontana A, Canale V. Surface charge modulation of sulfobetaine micelles by interaction with different anions: A dynamic light scattering study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.075] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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102
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Pleines M, Kunz W, Zemb T, Benczédi D, Fieber W. Molecular factors governing the viscosity peak of giant micelles in the presence of salt and fragrances. J Colloid Interface Sci 2019; 537:682-693. [DOI: 10.1016/j.jcis.2018.11.072] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/16/2018] [Accepted: 11/17/2018] [Indexed: 11/30/2022]
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103
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Yu Y, Yao Y, van Lin S, de Beer S. Specific anion effects on the hydration and tribological properties of zwitterionic phosphorylcholine-based brushes. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.01.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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104
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Musilová L, Kašpárková V, Mráček A, Minařík A, Minařík M. The behaviour of hyaluronan solutions in the presence of Hofmeister ions: A light scattering, viscometry and surface tension study. Carbohydr Polym 2019; 212:395-402. [PMID: 30832872 DOI: 10.1016/j.carbpol.2019.02.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 01/27/2019] [Accepted: 02/11/2019] [Indexed: 11/15/2022]
Abstract
Dynamic light scattering (DLS), viscosity and surface tension (SFT) measurements were used to characterize influence of salts containing ions of Hofmeister series (Na2SO4, (NH4)2SO4, NaSCN, NH4SCN and NaCl) on the behaviour of hyaluronan in diluted solutions at a temperature range of 15-45 °C. The results of the study showed that chaotropic and kosmotropic ions notably influenced the folding and unfolding of hyaluronan coils due to interactions between a respective ion and hydrophilic or hydrophobic patches present in the backbone of the polymer chains. This was mainly proved by viscosity and light scattering measurements. The temperature dependence of the hydrodynamic diameter of the hyaluronan coil determined by DLS demonstrated that combinations of chaotropic and kosmotropic ions in one salt (NaCl, NaSCN and (HN4)2SO4) can stabilize the size of the coil in a wide range of temperatures. Tensiometry measurements indicated that certain types of ions present in the solution caused an unfolding of the hyaluronan coils, leading to a decrease of SFT.
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Affiliation(s)
- Lenka Musilová
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Material Engineering, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic; Centre of Polymer Systems, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic
| | - Věra Kašpárková
- Centre of Polymer Systems, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic; Tomas Bata University in Zlín, Faculty of Technology, Department of Fat, Surfactant and Cosmetics Technology, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic
| | - Aleš Mráček
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Material Engineering, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic; Centre of Polymer Systems, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic.
| | - Antonín Minařík
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Material Engineering, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic; Centre of Polymer Systems, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic
| | - Martin Minařík
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Material Engineering, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic
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105
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Sakamaki T, Inutsuka Y, Igata K, Higaki K, Yamada NL, Higaki Y, Takahara A. Ion-Specific Hydration States of Zwitterionic Poly(sulfobetaine methacrylate) Brushes in Aqueous Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1583-1589. [PMID: 30441903 DOI: 10.1021/acs.langmuir.8b03104] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The ion-specific hydration states of zwitterionic poly(3-( N-2-methacryloyloxyethyl- N, N-dimethyl)ammonatopropanesulfonate) (PMAPS) brushes in various aqueous solutions were investigated by neutron reflectivity (NR) and atomic force microscopy (AFM). The asymmetric hydration state of the PMAPS brushes was verified from the NR scattering-length density profiles, while the variation in their swollen thickness was complementary as determined from AFM topographic images. PMAPS brushes got thicker in any salt solutions, while the extent of swelling and the dimensions of swollen chain structure were dependent on the ion species and salt concentration in the solutions. Anion specificity was clearly observed, whereas cations exhibited weaker modulation in ion-specific hydration states. The anion specificity could be ascribed to ion-specific interactions between the quaternary ammonium cation in sulfobetaine and the anions. The weak cation specificity was attributed to the intrinsically weak cohesive interactions between the weakly hydrated sulfonate anion in sulfobetaine and the strongly hydrated cations. The ion-specific hydration of PMAPS brushes was largely consistent with the ion-specific aggregation state of the PMAPS chains in aqueous solutions.
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Affiliation(s)
| | | | | | | | - Norifumi L Yamada
- Neutron Science Laboratory , High Energy Accelerator Research Organization , Ibaraki 319-1106 , Japan
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106
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Chen Y, Luo SC. Synergistic Effects of Ions and Surface Potentials on Antifouling Poly(3,4-ethylenedioxythiophene): Comparison of Oligo(Ethylene Glycol) and Phosphorylcholine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1199-1210. [PMID: 30089366 DOI: 10.1021/acs.langmuir.8b02122] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
For electrified surfaces, ions and applied potentials play major roles in controlling the surface properties. Antifouling materials such as poly(ethylene glycol) and zwitterionic polymers that resist nonspecific protein binding and cell adhesion play a key role in various biomedical applications. In this study, we investigated and compared the antifouling properties of conducting polymers grafted with oligo(ethylene glycol) groups and phosphorylcholine (PC) groups in the presence of different anions and applied potentials. Considerable effort has been made to illustrate the different effects of manipulating the antifouling properties of these two surfaces. We prepared polymer films by applying electropolymerization to two functionalized (3,4-ethylenedioxythiophene) polymers containing triethylene glycol and PC groups, respectively. A quartz crystal microbalance with dissipation (QCM-D) was employed to characterize the negatively charged bovine serum albumin and positively charged lysozyme adsorption as a function of ionic concentration in the presence of various Hofmeister anions. The frequency changes corresponded to the protein or ion adsorption/desorption behavior on the surface. The anions adsorbed on polymer films to effectively enhance the hydration layer of the polymer surface and reduce nonspecific protein binding. We further integrated a potentiostat with the QCM-D to control the protein adsorption/desorption behaviors by applying potentials, and we conducted an electrochemical QCM-D study. Most importantly, with the synergistic effect of ions and surface potential, a nearly fresh polymer surface was regenerated. This study describes principles to maintain and regenerate the antifouling properties of electrified surfaces, which are critical for implanted bioelectronics applications.
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Affiliation(s)
- Yue Chen
- Department of Materials Science and Engineering , National Taiwan University , No. 1, Sec. 4, Roosevelt Road , Taipei 10617 , Taiwan
| | - Shyh-Chyang Luo
- Department of Materials Science and Engineering , National Taiwan University , No. 1, Sec. 4, Roosevelt Road , Taipei 10617 , Taiwan
- Advanced Research Center for Green Materials Science and Technology , National Taiwan University , Taipei 10617 , Taiwan
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107
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Xu J, Xie H, Zhang H, Xu H, Fang L, Zhao W, Wu Y. New insight into the transition mechanism of pH-tunable wormlike micelles based on experiments and DPD simulation. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.12.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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108
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Liu C, Wang Y, Gao Y, Zhang Y, Zhao L, Xu B, Romsted LS. Effects of interfacial specific cations and water molarities on AOT micelle-to-vesicle transitions by chemical trapping: the specific ion-pair/hydration model. Phys Chem Chem Phys 2019; 21:8633-8644. [DOI: 10.1039/c8cp05987j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Added salts induce micelle-to-vesicle transitions at specific cation concentrations in Hofmeister order by forming polar headgroup–counterion pairs that release water.
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Affiliation(s)
- Changyao Liu
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yuzhao Wang
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yanfei Gao
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yongliang Zhang
- Department of Chemistry and Chemical Biology, Rutgers
- The State University of New Jersey
- USA
| | - Li Zhao
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Baocai Xu
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Laurence S. Romsted
- Department of Chemistry and Chemical Biology, Rutgers
- The State University of New Jersey
- USA
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109
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Jhiang JS, Wu TH, Chou CJ, Chang Y, Huang CJ. Gel-like ionic complexes for antimicrobial, hemostatic and adhesive properties. J Mater Chem B 2019; 7:2878-2887. [DOI: 10.1039/c8tb03367f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ion-specific effects offer a great opportunity to construct intelligent macromolecular systems with diverse architectures, on-demand controlled release behaviors and interfacial responsiveness.
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Affiliation(s)
- Jhia-Sin Jhiang
- R&D Center for Membrane Technology
- Chung Yuan Christian University
- Chung-Li City 32023
- Taiwan
- Department of Chemical Engineering
| | - Tzu-Hsien Wu
- Department of Biomedical Sciences and Engineering
- National Central University
- Jhong-Li
- Taiwan
| | - Chung-Jung Chou
- R&D Center for Membrane Technology
- Chung Yuan Christian University
- Chung-Li City 32023
- Taiwan
- Department of Chemical Engineering
| | - Yung Chang
- R&D Center for Membrane Technology
- Chung Yuan Christian University
- Chung-Li City 32023
- Taiwan
- Department of Chemical Engineering
| | - Chun-Jen Huang
- Department of Chemical Engineering
- Chung Yuan Christian University
- Chung-Li City 32023
- Taiwan
- Department of Biomedical Sciences and Engineering
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110
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Liu Z, Fan Y, Wang Y. Selective separation of heavy metal ions from dilute aqueous solutions by foams and micelles of surfactants. SOFT MATTER 2018; 14:9830-9837. [PMID: 30484809 DOI: 10.1039/c8sm02036a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Traditional metal ion separation by surfactant foams is dependent on the interaction difference of various metal ions with surfactant monomers rather than surfactant aggregates, because the binding of metal ions with surfactant aggregates retains the metal ions in bulk solution. This kind of separation method is only effective for the metal ions with obvious differences in valence, size or coordination ability. The present study proposes a novel separation method based on the binding affinity difference of metal ions with micelles and monomers of two surfactants to selectively separate multivalent ions Cr3+, Ni2+ and Cu2+ from their dilute mixed aqueous solution. The two surfactants are single-chain surfactant sodium dodecyl sulfate (SDS) and gemini surfactant 1,3-bis(N-dodecyl-N-propanesulfonate sodium)-propane (C12C3C12(SO3)2), which show negligible synergism because they are both negatively charged and hold a significantly different self-assembling ability, thus allowing the coexistence of SDS/C12C3C12(SO3)2 micelles with SDS monomers. At first, Cr3+ ions were separated from Cu2+ and Ni2+ ions by the foam generated by the SDS monomers due to more intensive electrostatic interaction of Cr3+ ions with the SDS monomers. Afterwards Ni2+ ions were separated from Cu2+ ions by utilizing the high binding affinity of Cu2+ with the SDS/C12C3C12(SO3)2 micelles in the bulk solution and Ni2+ with the SDS monomers in the foam. This work has proved that micelles can assist the selective separation of "twin-like" metal ions Ni2+ and Cu2+ when the concentrations of monomers and micelles are properly adjusted.
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Affiliation(s)
- Zhang Liu
- CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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111
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Exploring Structure⁻Property Relationships of GAGs to Tailor ECM-Mimicking Hydrogels. Polymers (Basel) 2018; 10:polym10121376. [PMID: 30961301 PMCID: PMC6401775 DOI: 10.3390/polym10121376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/03/2018] [Accepted: 12/09/2018] [Indexed: 12/31/2022] Open
Abstract
Glycosaminoglycans (GAGs) are a class of linear polysaccharides that are ubiquitous in the extracellular matrix (ECM) and on cell surfaces. Due to their key role in development, homeostasis, pathogenesis, and regeneration, GAGs are increasingly used in the design of ECM-mimicking hydrogels to stimulate tissue formation and regenerative processes via specifically orchestrated cell-instructive signals. These applications first and foremost build on the ability of GAGs to effectively bind, protect, and release morphogens. The specificity and strength of morphogen-GAG interactions are largely governed by the number and spatial distribution of negatively charged sulfate groups carried by GAGs. Herein, we summarize a mean-field approach to quantify the density of ionizable groups, GAG concentration, and cross-linking degree of GAG-containing hydrogels on the basis of microslit electrokinetic experiments. We further present and discuss a continuum model of mucosa that accounts for charge regulation by glycan-ion pairing in biological contexts and under conditions of macromolecular crowding. Finally, we discuss the modulation of the morphogen binding and transport in GAG hydrogels by selective desulfation of the GAG component.
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112
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Javed F, Ullah F, Zakaria MR, Akil HM. An approach to classification and hi-tech applications of room-temperature ionic liquids (RTILs): A review. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.005] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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113
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Teychené J, Balmann HD, Maron L, Galier S. Why Are Saccharides Dehydrated in the Presence of Electrolytes? Insights from Molecular Modeling and Thermodynamic Measurements. ACS CENTRAL SCIENCE 2018; 4:1531-1536. [PMID: 30555905 PMCID: PMC6276038 DOI: 10.1021/acscentsci.8b00610] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Indexed: 06/09/2023]
Abstract
The mechanisms governing the interactions of neutral polar solutes with ions in aqueous solutions are still poorly understood, despite the importance of this phenomenon in many fields (chemistry, physicochemistry, biology, food industries). In order to go further through the understanding of the molecular mechanisms governing the ions' specific effects, this paper presents a generic method dealing with the characterization and understanding of interactions between saccharides and ions in aqueous systems. For that, an original approach combining a computational technique and experimental measurements (thermodynamic properties) is proposed to explain and rationalize the relationship between the solute hydration and the physical chemistry of the ions in solution (cation/anion, charge, size, and hydration). These relationships make it possible to evaluate the hydration state of a saccharide, a polar neutral molecule, according to the ionic composition, from the knowledge of the ions' hydration properties. This work proposes new insight into molecular mechanisms governing the polar neutral solute/ion interactions and a new understanding of the hydration phenomenon in electrolytic solutions.
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Affiliation(s)
- Johanne Teychené
- Laboratoire
de Genie Chimique, Université
de Toulouse, CNRS, INP, UPS, Toulouse, France
| | - Hélène
Roux-de Balmann
- Université
de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077 Toulouse Cedex, France
| | - Laurent Maron
- Université
de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077 Toulouse Cedex, France
| | - Sylvain Galier
- Laboratoire
de Genie Chimique, Université
de Toulouse, CNRS, INP, UPS, Toulouse, France
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114
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Sharker KK, Nazrul Islam M, Das S. Interactions of Some Hofmeister Cations with Sodium Dodecyl Sulfate in Aqueous Solution. J SURFACTANTS DETERG 2018. [DOI: 10.1002/jsde.12227] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Komol Kanta Sharker
- Department of Chemistry Bangladesh University of Engineering and Technology Dhaka, 1000 Bangladesh
| | - Md. Nazrul Islam
- Department of Chemistry Bangladesh University of Engineering and Technology Dhaka, 1000 Bangladesh
| | - Shuvo Das
- Department of Chemistry Bangladesh University of Engineering and Technology Dhaka, 1000 Bangladesh
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115
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Jackson GL, Mantha S, Kim SA, Diallo SO, Herwig KW, Yethiraj A, Mahanthappa MK. Ion-Specific Confined Water Dynamics in Convex Nanopores of Gemini Surfactant Lyotropic Liquid Crystals. J Phys Chem B 2018; 122:10031-10043. [PMID: 30251848 DOI: 10.1021/acs.jpcb.8b05942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The impact of pore geometry and functionality on the dynamics of water nanoconfined in porous media are the subject of some debate. We report the synthesis and small-angle X-ray scattering (SAXS) characterization of a series of perdeuterated gemini surfactant lyotropic liquid crystals (LLCs), in which convex, water-filled nanopores of well-defined dimensions are lined with carboxylate functionalities. Quasielastic neutron scattering (QENS) measurements of the translational water dynamics in these dicarboxylate LLC nanopores as functions of the surfactant hydration state and the charge compensating counterion (Na+, K+, NMe4+) reveal that the measured dynamics depend primarily on surfactant hydration, with an unexpected counterion dependence that varies with hydration number. We rationalize these trends in terms of a balance between counterion-water attractions and the nanopore volume excluded by the counterions. On the basis of electron density maps derived from SAXS analyses of these LLCs, we directly show that the volume excluded by the counterions depends on both their size and spatial distribution in the water-filled channels. The translational water dynamics in the convex pores of these LLCs are also slower than those reported in the concave pores of AOT reverse micelles, implying that water dynamics also depend on the nanopore curvature.
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Affiliation(s)
- Grayson L Jackson
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Sriteja Mantha
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Sung A Kim
- Department of Chemical Engineering & Materials Science , University of Minnesota , 421 Washington Avenue, S.E. , Minneapolis , Minnesota 55455 , United States
| | | | | | - Arun Yethiraj
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Mahesh K Mahanthappa
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States.,Department of Chemical Engineering & Materials Science , University of Minnesota , 421 Washington Avenue, S.E. , Minneapolis , Minnesota 55455 , United States
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116
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Zhang J, Cai H, Tang L, Liu G. Tuning the pH Response of Weak Polyelectrolyte Brushes with Specific Anion Effects. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12419-12427. [PMID: 30220208 DOI: 10.1021/acs.langmuir.8b02776] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The positively charged poly( N, N'-dimethylaminoethyl methacrylate) (PDMAEMA) brushes have been employed as model weak polyelectrolyte brushes (WPBs) to demonstrate the tuning of the pH response of WPBs with specific anion effects. The charge density of PDMAEMA brushes can be modulated by specific ion-pairing interactions between counterions and the protonated dimethylamino group; as a result, the strength of the pH response of PDMAEMA brushes can be tuned by specific anion effects. A more chaotropic counterion can more strongly interact with the protonated dimethylamino group, thereby more effectively neutralizing the positively charged group associated with the grafted weak polyelectrolyte chains and more remarkably suppressing the pH response of PDMAEMA brushes. Although the pH response of PDMAEMA brushes is insensitive to the anion identity at a low salt concentration, it can be tuned by specific anion effects at relatively high salt concentrations. Our study demonstrates that the pH-responsive properties of PDMAEMA brushes including hydration, conformation, oil wettability, and adhesion can be tuned by specific anion effects. The work presented here provides a method to tune the pH response of WPBs by the anion identity.
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Affiliation(s)
- Jian Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei 230026 , P. R. China
| | - Hongtao Cai
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei 230026 , P. R. China
| | - Ling Tang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei 230026 , P. R. China
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei 230026 , P. R. China
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117
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Imai Y, Tokiwa Y, Ueno S, Tanida H, Watanabe I, Matsubara H, Takiue T, Aratono M. Effect of the Headgroup Structure on Counterion Binding in Adsorbed Surfactant Films Investigated by Total Reflection X-ray Absorption Fine Structure Spectroscopy. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Yosuke Imai
- Division for Experimental Nature Science, Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yuhei Tokiwa
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shusaku Ueno
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hajime Tanida
- Materials Sciences Research Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan
| | - Iwao Watanabe
- Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Hiroki Matsubara
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takanori Takiue
- Division for Experimental Nature Science, Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Makoto Aratono
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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118
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Han T, Zhang C, Luo J. Macroscale Superlubricity Enabled by Hydrated Alkali Metal Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11281-11291. [PMID: 30175911 DOI: 10.1021/acs.langmuir.8b01722] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superlubricity based on hydration lubrication provides a near-frictionless lubrication state for the extreme reduction of friction in aqueous conditions. Nevertheless, how to obtain the hydration superlubricity under macroscale conditions with higher load-carrying capacity still remains a challenge and the mechanisms governing macroscale superlubricity with hydrated ions are still not well comprehended. Here, we demonstrate that macroscale superlubricity based on hydrated alkali metal ions (Li+, Na+, K+) can be realized under high contact pressure between the Si3N4 ball and sapphire disk. The ultralow friction coefficients of 0.005 are obtained under average contact pressure up to 0.25 GPa by a universal micro-tribometer after a running-in period with acid solutions. The results reveal that running-in stage with acid solutions can not only make the worn region smoother but also generate a silica layer that is easy to shear, which provides excellent boundary lubrication. The hydration superlubricity occurs because hydration shells surrounding the alkali metal ions could generate the hydration repulsive force to sustain a large normal load and have a fluid response to shear simultaneously. These findings pave the way to the scale-up of hydration superlubricity and thus to the wide application of new water-based lubricants.
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Affiliation(s)
- Tianyi Han
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Chenhui Zhang
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Jianbin Luo
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
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119
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Investigating hydrophilic and electrostatic properties of surfactants using retention on two mixed-mode liquid chromatographic columns. J Chromatogr A 2018; 1571:185-192. [PMID: 30146378 DOI: 10.1016/j.chroma.2018.08.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 08/01/2018] [Accepted: 08/09/2018] [Indexed: 11/23/2022]
Abstract
In environmental risk assessment, it is essential to understand the relationship between molecular structure and fate and toxicity of organic contaminants. For surfactants, physico-chemical parameters which can reflect the interactions that determine surfactant behavior are not well defined and are therefore needed for the development of robust quantitative structure-activity relationships (QSAR). For the present study, we have measured HPLC retention times of several hydrocarbon and perfluorocarbon surfactant groups on a mixed-mode weak anion-exchange (WAX) and mixed-mode hydrophilic interaction liquid chromatography (HILIC) stationary phase. The nonionic alcohol ethoxylates are well retained on the HILIC column. Retention of anionic surfactants on the HILIC column is likely influenced by the degree of hydration of the surfactants and electrostatic repulsion from silanol groups. Less hydrated anionic surfactants (perfluoroalkyl carboxylates, perfluoroalkyl sulfonates and alkyl sulfates) show minimal hydrophilic interaction while other better hydrated anionic surfactants (alkyl carboxylates and alkyl sulfonates) are well retained. The retention mechanism of surfactants on both columns seems to be related to their degree of hydration, albeit expressed in different retention behavior: generally, retention on the WAX phase increases when retention on the HILIC phase decreases, and vice versa. The retention times from both columns were used to calculate retention factors (k') and these were subsequently used in calculating parameters that reflect the electrostatic property (kAX) and hydrophilic property (kHILIC) that determine the interaction between the hydrophilic part of the surfactant and the stationary phase. In further development of predictive models, we suggest the use of kAX for anionic surfactants and kHILIC for nonionic surfactants.
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120
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Corti M, Raudino A, Cantu' L, Theisen J, Pleines M, Zemb T. Nanometric Surface Oscillation Spectroscopy of Water-Poor Microemulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8154-8162. [PMID: 29914260 DOI: 10.1021/acs.langmuir.8b00716] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Selectively exchanging metal complexes between emulsified water-poor microemulsions and concentrated solutions of mixed electrolytes is the core technology for strategic metal recycling. Nanostructuration triggered by solutes present in the organic phase is understood, but little is known about fluctuations of the microemulsion-water interface. We use here a modified version of an optoelectric device initially designed for air bubbles, in order to evidence resonant electrically induced surface waves of an oily droplet suspended in an aqueous phase. Resonant waves of nanometer amplitude of a millimeter-sized microemulsion droplet containing a common ion-specific extractant diluted by dodecane and suspended in a solution of rare earth nitrate are evidenced for the first time with low excitation fields (5 V/cm). From variation of the surface wave spectrum with rare earth concentration, we evidence uptake of rare-earth ions at the interface and at higher concentration the formation of a thin "crust" of liquid crystal forming at unusually low concentration, indicative of a surface induced phase transition. The effect of the liquid crystal structure on the resonance spectrum is backed up by a model, which is used to estimate crust thickness.
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Affiliation(s)
- Mario Corti
- CNR-IPCF , Viale Ferdinando Stagno d'Alcontres 37 , 98158 Messina , Italy
| | - Antonio Raudino
- Department Chemical Science , University of Catania , Viale A. Doria 6 , 95125 Catania , Italy
| | - Laura Cantu'
- Department Medical Biotechnology and Translational Medicine , University of Milano , LITA, Via Fratelli Cervi 93 , 20090 Segrate , Italy
| | - Johannes Theisen
- ICSM CEA/CNRS/UMontpellier/ENSCM, CEA Marcoule, BP17171, 30207 Bagnols-sur-Cèze , France
| | - Maximilian Pleines
- ICSM CEA/CNRS/UMontpellier/ENSCM, CEA Marcoule, BP17171, 30207 Bagnols-sur-Cèze , France
| | - Thomas Zemb
- ICSM CEA/CNRS/UMontpellier/ENSCM, CEA Marcoule, BP17171, 30207 Bagnols-sur-Cèze , France
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121
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Hammer J, Tukker AM, Postma JF, Haftka JJH, Hermens JLM, de Voogt P, Kraak MHS. Solubility Constraints on Aquatic Ecotoxicity Testing of Anionic Surfactants. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2018; 101:99-104. [PMID: 29858623 PMCID: PMC6028843 DOI: 10.1007/s00128-018-2361-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 05/14/2018] [Indexed: 05/03/2023]
Abstract
In order to develop models that can predict the environmental behavior and effects of chemicals, reliable experimental data are needed. However, for anionic surfactants the number of ecotoxicity studies is still limited. The present study therefore aimed to determine the aquatic ecotoxicity of three classes of anionic surfactants. To this purpose we subjected daphnids (Daphnia magna) for 48 h to alkyl carboxylates (CxCO2-), alkyl sulfonates (CxSO3-), and alkyl sulfates (CxSO4-) with different carbon chain lengths (x). However, all surfactants with x > 11 showed less than 50% immobility at water solubility. Hence, EC50 values for only few surfactants could be gathered: C9CO2- (16 mg L-1), C11CO2- (0.8 mg L-1) and C11SO4- (13.5 mg L-1). Data from these compounds showed an increase in ecotoxicity with a factor 4.5 per addition of a hydrocarbon unit to the alkyl chain, and a factor 20 when replacing the sulfate head group by a carboxylate head group. Unfortunately, we could not test carboxylates with a broader variety of chain lengths because solubility limited the range of chain length that can be tested.
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Affiliation(s)
- J Hammer
- Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, P.O. Box 94248, 1090 GE, Amsterdam, The Netherlands.
- Institute for Risk Assessment Sciences, Toxicology Division, Utrecht University, P.O. Box 80177, 3508 TD, Utrecht, The Netherlands.
| | - A M Tukker
- Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, P.O. Box 94248, 1090 GE, Amsterdam, The Netherlands
- Institute for Risk Assessment Sciences, Toxicology Division, Utrecht University, P.O. Box 80177, 3508 TD, Utrecht, The Netherlands
| | - J F Postma
- Ecofide, Singel 105, 1381 AT, Weesp, The Netherlands
| | - J J-H Haftka
- Institute for Risk Assessment Sciences, Toxicology Division, Utrecht University, P.O. Box 80177, 3508 TD, Utrecht, The Netherlands
| | - J L M Hermens
- Institute for Risk Assessment Sciences, Toxicology Division, Utrecht University, P.O. Box 80177, 3508 TD, Utrecht, The Netherlands
| | - P de Voogt
- Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, P.O. Box 94248, 1090 GE, Amsterdam, The Netherlands
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB, Nieuwegein, The Netherlands
| | - M H S Kraak
- Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, P.O. Box 94248, 1090 GE, Amsterdam, The Netherlands
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122
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Fan Y, Ma J, Fang Y, Liu T, Hu X, Xia Y. Neutral and acid-adapted fatty acid vesicles of conjugated linoleic acid. Colloids Surf B Biointerfaces 2018; 167:385-391. [DOI: 10.1016/j.colsurfb.2018.04.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/04/2018] [Accepted: 04/16/2018] [Indexed: 12/19/2022]
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123
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Akpinar E, Yurdakul S, Neto AMF. Comparison between lyotropic cholesteric phase behavior with partly fluorinated surfactants and their exact hydrogenated counterparts. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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124
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125
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Higaki Y, Inutsuka Y, Ono H, Yamada NL, Ikemoto Y, Takahara A. Counteranion-Specific Hydration States of Cationic Polyelectrolyte Brushes. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00210] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuji Higaki
- Japan Science
and Technology Agency (JST), ERATO, Takahara Soft Interfaces Project, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | | | | | - Norifumi L. Yamada
- Neutron Science Laboratory, High Energy Accelerator Research Organization, Ibaraki 319-1106, Japan
| | - Yuka Ikemoto
- Japan Synchrotron Radiation
Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho,
Sayo-gun, Hyogo 679-5198, Japan
| | - Atsushi Takahara
- Japan Science
and Technology Agency (JST), ERATO, Takahara Soft Interfaces Project, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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126
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Lima FS, Andrade MFC, Mortara L, Gustavo Dias L, Cuccovia IM, Chaimovich H. Ion dehydration controls adsorption at the micellar interface: hydrotropic ions. Phys Chem Chem Phys 2018; 19:30658-30666. [PMID: 29119186 DOI: 10.1039/c7cp05283a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The properties of ionic micelles depend on the nature of the counterion, and these effects become more evident as the ion adsorption at the interface increases. Prediction of the relative extent of ion adsorption is required for rational design of ionic micellar aggregates. Unlike the well understood adsorption of monatomic ions, the adsorption of polyatomic ions is not easily predicted. We combined experimental and computational methods to evaluate the affinity of hydrotropic ions, i.e., ions with polar and apolar regions, to the surface of positively charged micelles. We analyzed cationic micelles of dodecyltrimethylammonium and six hydrotropic counterions: methanesulfonate, trifluoromethanesulfonate, benzenesulfonate, acetate, trifluoroacetate and benzoate. Our results demonstrated that the apolar region of hydrotropic ions had the largest influence on micellar properties. The dehydration of the apolar region of hydrotropic ions upon their adsorption at the micellar interface determined the ion adsorption extension, differently to what was expected based on Collins' law of matching affinities. These results may lead to more general models to describe the adsorption of ions, including polyatomic ions, at the micellar interface.
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Affiliation(s)
- Filipe S Lima
- Departamento de Química Fundamental, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Recife, Brazil.
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127
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Effect of inorganic and organic counterions on interfacial properties of oleic acid-based gemini surfactants. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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128
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Level G, Vieira Fadul M, Blesic M. Solubility-Modifying Power of Zwitterionic Salts. Chemphyschem 2018; 19:575-580. [DOI: 10.1002/cphc.201701229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Gaelle Level
- School of Chemistry and Chemical Engineering; Queen's University Belfast; Stranmillis Road Belfast BT9 5AG UK
| | - Mariana Vieira Fadul
- School of Chemistry and Chemical Engineering; Queen's University Belfast; Stranmillis Road Belfast BT9 5AG UK
| | - Marijana Blesic
- School of Chemistry and Chemical Engineering; Queen's University Belfast; Stranmillis Road Belfast BT9 5AG UK
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129
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Adams EM, Verreault D, Jayarathne T, Cochran RE, Stone EA, Allen HC. Surface organization of a DPPC monolayer on concentrated SrCl 2 and ZnCl 2 solutions. Phys Chem Chem Phys 2018; 18:32345-32357. [PMID: 27854367 DOI: 10.1039/c6cp06887a] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metals are known to be enriched in organic-coated marine aerosols, but the impact these cations have on their surface properties is not well understood. Here the effect of Zn2+ enrichment on the surface properties of a dipalmitoylphosphatidylcholine (DPPC) monolayer was investigated and compared to that of the alkaline earth metal Sr2+, an ion not enriched in aerosols. Phase behavior of the DPPC film on concentrated aqueous solutions was probed with surface pressure-area isotherms while domain morphology was monitored with Brewster angle microscopy (BAM). Infrared reflection-absorption spectroscopy (IRRAS) and vibrational sum frequency generation (VSFG) spectroscopy were used to assess the impact of cations on the conformation and orientation of alkyl chains as well as the hydration state of the carbonyl and phosphatidylcholine (PC) moieties. Results of compression isotherms and BAM show that Zn2+ strongly interacts with DPPC molecules, and induces condensation of the monolayer while Sr2+ only weakly interacts with the monolayer in expanded phases. Conformational order and orientation of alkyl chains in the condensed phase are not significantly altered by either cation. IRRAS indicates that Sr2+ has weak interactions with the PC headgroup. Zn2+ ions cause dehydration of carbonyl groups and binds to the phosphate group in a 2 : 1 bridging complex. Findings here suggest that Sr2+ is not enriched in aerosols because it behaves similar to a monovalent ion and only weakly interacts with the monolayer, while enrichment of Zn2+ is due to strong binding to the lipid film.
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Affiliation(s)
- Ellen M Adams
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
| | - Dominique Verreault
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
| | | | - Richard E Cochran
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Elizabeth A Stone
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
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130
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Krishnamoorthy AN, Zeman J, Holm C, Smiatek J. Preferential solvation and ion association properties in aqueous dimethyl sulfoxide solutions. Phys Chem Chem Phys 2018; 18:31312-31322. [PMID: 27824183 DOI: 10.1039/c6cp05909k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We study the solvation and the association properties of ion pairs in aqueous dimethyl sulfoxide (DMSO) solution by atomistic molecular dynamics (MD) simulations. The ion pair is composed of two lithium and a single sulfonated diphenyl sulfone ion whose properties are studied under the influence of different DMSO concentrations. For increasing mole fractions of DMSO, we observe a non-ideal behavior of the solution as indicated by the derivatives of the chemical activity. Our findings are complemented by dielectric spectra, which also verify a complex DMSO-water mixing behavior. In agreement with these results, further simulation outcomes reveal an aqueous homoselective solvation of the ion species which fosters the occurrence of pronounced ion association constants at higher DMSO mole fractions. The consequences of this finding are demonstrated by lower ionic conductivities for increasing concentrations of DMSO.
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Affiliation(s)
| | - Johannes Zeman
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
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131
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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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132
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Sanchez-Fernandez A, Hammond OS, Edler KJ, Arnold T, Doutch J, Dalgliesh RM, Li P, Ma K, Jackson AJ. Counterion binding alters surfactant self-assembly in deep eutectic solvents. Phys Chem Chem Phys 2018; 20:13952-13961. [DOI: 10.1039/c8cp01008k] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Counterion adsorption unexpectedly changes self-assembly behaviour in deep eutectic solvents.
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Affiliation(s)
| | - O. S. Hammond
- Centre for Sustainable Chemical Technologies
- University of Bath
- Bath
- UK
| | - K. J. Edler
- Department of Chemistry
- University of Bath
- Bath
- UK
| | - T. Arnold
- Department of Chemistry
- University of Bath
- Bath
- UK
- European Spallation Source
| | - J. Doutch
- ISIS Neutron and Muon Source
- Science and Technology Facilities Council
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - R. M. Dalgliesh
- ISIS Neutron and Muon Source
- Science and Technology Facilities Council
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - P. Li
- ISIS Neutron and Muon Source
- Science and Technology Facilities Council
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - K. Ma
- ISIS Neutron and Muon Source
- Science and Technology Facilities Council
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - A. J. Jackson
- European Spallation Source
- Lund
- Sweden
- Department of Physical Chemistry
- Lund University
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133
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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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134
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Chen Z, Penfold J, Li P, Doutch J, Fan Y, Wang Y. Effects of length and hydrophilicity/hydrophobicity of diamines on self-assembly of diamine/SDS gemini-like surfactants. SOFT MATTER 2017; 13:8980-8989. [PMID: 29160329 DOI: 10.1039/c7sm02058a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work studied gemini-like surfactants formed from anionic surfactant sodium dodecyl sulfate (SDS) and cationic charged bola-type diamines with hydrophilic or hydrophobic spacers of different lengths using surface tension, small angle neutron scattering, isothermal titration microcalorimetry and cryogenic transmission electron microscopy. The critical micelle concentrations (CMC) and the surface tension at CMC (γCMC) for all the diamine/SDS mixtures are markedly lower than that of SDS. The shorter diamines reduce γCMC to a greater extent regardless of the hydrophilicity/hydrophobicity of the diamines. Meanwhile, either the hydrophobic diamine with a longer spacer or the hydrophilic diamine with a shorter spacer is more beneficial to decrease CMC and leads to the transition from spherical micelles into rodlike or wormlike micelles. This is principally because of the formation of gemini-like surfactants by the electrostatic binding between SDS and the diamines, where the electrostatic repulsion between the adjacent headgroups of SDS becomes much weaker due to the electrostatic binding of oppositely charged diamine with SDS, and the longer hydrophobic spacer may also bend into the hydrophobic domain of micelles to promote micellar growth. However, the hydrophilic spacers are more compatible with the headgroup region, leading to micelles with a larger curvature. This work contributes to the understanding of the relationship between the properties of constructed gemini-like surfactants and the natures of connecting molecules, and provides guidance to efficiently improve the performance of surfactants.
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Affiliation(s)
- Zhidi Chen
- CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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135
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Jakobsson E, Argüello-Miranda O, Chiu SW, Fazal Z, Kruczek J, Nunez-Corrales S, Pandit S, Pritchet L. Towards a Unified Understanding of Lithium Action in Basic Biology and its Significance for Applied Biology. J Membr Biol 2017; 250:587-604. [PMID: 29127487 PMCID: PMC5696506 DOI: 10.1007/s00232-017-9998-2] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 10/21/2017] [Indexed: 01/14/2023]
Abstract
Lithium has literally been everywhere forever, since it is one of the three elements created in the Big Bang. Lithium concentration in rocks, soil, and fresh water is highly variable from place to place, and has varied widely in specific regions over evolutionary and geologic time. The biological effects of lithium are many and varied. Based on experiments in which animals are deprived of lithium, lithium is an essential nutrient. At the other extreme, at lithium ingestion sufficient to raise blood concentration significantly over 1 mM/, lithium is acutely toxic. There is no consensus regarding optimum levels of lithium intake for populations or individuals-with the single exception that lithium is a generally accepted first-line therapy for bipolar disorder, and specific dosage guidelines for sufferers of that condition are generally agreed on. Epidemiological evidence correlating various markers of social dysfunction and disease vs. lithium level in drinking water suggest benefits of moderately elevated lithium compared to average levels of lithium intake. In contrast to other biologically significant ions, lithium is unusual in not having its concentration in fluids of multicellular animals closely regulated. For hydrogen ions, sodium ions, potassium ions, calcium ions, chloride ions, and magnesium ions, blood and extracellular fluid concentrations are closely and necessarily regulated by systems of highly selective channels, and primary and secondary active transporters. Lithium, while having strong biological activity, is tolerated over body fluid concentrations ranging over many orders of magnitude. The lack of biological regulation of lithium appears due to lack of lithium-specific binding sites and selectivity filters. Rather lithium exerts its myriad physiological and biochemical effects by competing for macromolecular sites that are relatively specific for other cations, most especially for sodium and magnesium. This review will consider what is known about the nature of this competition and suggest using and extending this knowledge towards the goal of a unified understanding of lithium in biology and the application of that understanding in medicine and nutrition.
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Affiliation(s)
- Eric Jakobsson
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
| | | | - See-Wing Chiu
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Zeeshan Fazal
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - James Kruczek
- Department of Physics, University of South Florida, Tampa, FL, USA
| | - Santiago Nunez-Corrales
- National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Illinois Informatics Institute, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Sagar Pandit
- Department of Physics, University of South Florida, Tampa, FL, USA
| | - Laura Pritchet
- Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Department of Psychological and Brain Sciences, University of California at Santa Barbara, Santa Barbara, CA, USA
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136
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Bohinc K, Bossa GV, May S. Incorporation of ion and solvent structure into mean-field modeling of the electric double layer. Adv Colloid Interface Sci 2017; 249:220-233. [PMID: 28571611 DOI: 10.1016/j.cis.2017.05.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/28/2017] [Accepted: 05/02/2017] [Indexed: 01/13/2023]
Abstract
An electric double layer forms when the small mobile ions of an electrolyte interact with an extended charged object, a macroion. The competition between electrostatic attraction and translational entropy loss of the small ions results in a diffuse layer of partially immobilized ions in the vicinity of the macroion. Modeling structure and energy of the electric double layer has a long history that has lead to the classical Poisson-Boltzmann theory and numerous extensions that account for ion-ion correlations and structural ion and solvent properties. The present review focuses on approaches that instead of going beyond the mean-field character of Poisson-Boltzmann theory introduce structural details of the ions and the solvent into the Poisson-Boltzmann modeling framework. The former include not only excluded volume effects but also the presence of charge distributions on individual ions, spatially extended ions, and internal ionic degrees of freedom. The latter treat the solvent either explicitly as interacting Langevin dipoles or in the form of effective non-electrostatic interactions, in particular Yukawa interactions, that are added to the Coulomb potential. We discuss how various theoretical models predict structural properties of the electric double layer such as the differential capacitance and compare some of these predictions with computer simulations.
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Affiliation(s)
- Klemen Bohinc
- Faculty of Health Sciences, University of Ljubljana, Ljubljana SI-1000, Slovenia.
| | | | - Sylvio May
- Department of Physics, North Dakota State University, Fargo, ND 58108-6050, USA
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137
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Xiao ZB, Xing H, Xiao JX. Properties of disodium salt of 1-sulfo-cyclohexanecarboxylic acid as a novel hydrotropic agent and its effects on room-temperature surface activity of perfluorooctanesulfonates with high Krafft points. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.05.072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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138
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Carucci C, Salis A, Magner E. Specific Ion Effects on the Mediated Oxidation of NADH. ChemElectroChem 2017. [DOI: 10.1002/celc.201700672] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Cristina Carucci
- Department of Chemical Sciences, Synthesis and Solid State Pharmaceutical Centre, Bernal Institute; University of Limerick; Limerick Ireland
| | - Andrea Salis
- Department of Chemical and Geological Sciences; University of Cagliari; Cittadella Universitaria, SS 554 bivio Sestu 09042 Monserrato (CA) Italy
| | - Edmond Magner
- Department of Chemical Sciences, Synthesis and Solid State Pharmaceutical Centre, Bernal Institute; University of Limerick; Limerick Ireland
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139
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Ion-induced alterations of the local hydration environment elucidate Hofmeister effect in a simple classical model of Trp-cage miniprotein. J Mol Model 2017; 23:298. [PMID: 28956172 DOI: 10.1007/s00894-017-3471-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 09/10/2017] [Indexed: 10/18/2022]
Abstract
Protein stability is known to be influenced by the presence of Hofmeister active ions in the solution. In addition to direct ion-protein interactions, this influence manifests through the local alterations of the interfacial water structure induced by the anions and cations present in this region. In our earlier works it was pointed out that the effects of Hofmeister active salts on the stability of Trp-cage miniprotein can be modeled qualitatively using non-polarizable force fields. These simulations reproduced the structure-stabilization and structure-destabilization effects of selected kosmotropic and chaotropic salts, respectively. In the present study we use the same model system to elucidate atomic processes behind the chaotropic destabilization and kosmotropic stabilization of the miniprotein. We focus on changes of the local hydration environment of the miniprotein upon addition of NaClO4 and NaF salts to the solution. The process is separated into two parts. In the first, 'promotion' phase, the protein structure is fixed, and the local hydration properties induced by the simultaneous presence of protein and ions are investigated, with a special focus on the interaction of Hofmeister active anions with the charged and polar sites. In the second, 'rearrangement' phase we follow changes of the hydration of ions and the protein, accompanying the conformational relaxation of the protein. We identify significant factors of an enthalpic and entropic nature behind the ion-induced free energy changes of the protein-water system, and also propose a possible atomic mechanism consistent with the Collins's rule, for the chaotropic destabilization and kosmotropic stabilization of protein conformation.
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140
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Duhamet J, Möhwald H, Pleines M, Zemb T. Self-Regulated Ion Permeation through Extraction Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9873-9879. [PMID: 28846431 DOI: 10.1021/acs.langmuir.7b02256] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Separation of rare earth compounds from water into an organic phase in practical cases requires the use of specific ion binding ligands in high concentrations. These tend to form complex liquid crystalline phases preferentially at ion-rich locations inside a pertraction membrane. They form a blocking layer above an ion concentration threshold, which is experimentally characterized. It is shown to limit the flux through the membrane, which is studied for the application of rare earth recycling, an example being the phase transfer of Nd from water into organic phase. This feedback leads to a stationary membrane permeation rate that can be modeled without any free parameters in very good agreement with experiment. The ion-specific formation and dissolution of the blocking layer, a feature found also in nature, and its control suggest further studies to enhance permeation as well as its selectivity control.
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Affiliation(s)
- Jean Duhamet
- CEA, DEN, Research Department on Mining and Fuel Recycling Processes, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Helmuth Möhwald
- Department of Interfaces, Max Planck Institute of Colloids and Interfaces , 14476 Potsdam, Germany
| | - Maximilian Pleines
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA/CNRS/UM2/ENSCM) , BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Thomas Zemb
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA/CNRS/UM2/ENSCM) , BP 17171, 30207 Bagnols-sur-Cèze, France
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141
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Ionic interactions determine the morphology of dried alkali/liposome suspension droplets. Colloids Surf B Biointerfaces 2017; 160:473-482. [PMID: 28988125 DOI: 10.1016/j.colsurfb.2017.09.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 08/11/2017] [Accepted: 09/05/2017] [Indexed: 01/17/2023]
Abstract
We sought to understand why saline drops produce intriguing patterns when drying in the presence of zwitterionic liposomes. Specifically, we would like to comprehend why the nature of such patterns is hierarchically driven by the Hofmeister series. The liposome suspension is made of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) with alkali metal chlorides. A complexity analysis of the patterns gives a fractal dimension around 1.71, which means that the drying process resembles a DLA mechanism. A physicochemical study, including the determination of zeta potential, molecular dynamics simulations, microrheology, and calorimetry, supports the fact that electrostatic interactions among head groups of phospholipids with alkali cations are the driven forces behind the assembling of the observed structures. Moreover, we found that the morphology of the dried droplets is sensitive to the substrate. Our findings could be used in a biological context, for example, to characterize cells in ionic media.
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142
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Brown P, Sresht V, Eral BH, Fiore A, de la Fuente-Núñez C, O'Mahony M, Mendes GP, Heller WT, Doyle PS, Blankschtein D, Hatton TA. CO 2-Reactive Ionic Liquid Surfactants for the Control of Colloidal Morphology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7633-7641. [PMID: 28699755 DOI: 10.1021/acs.langmuir.7b00679] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This article reports on a new class of stimuli-responsive surfactant generated from commercially available amphiphiles such as dodecyltrimethylammmonium bromide (DTAB) by substitution of the halide counterion with counterions such as 2-cyanopyrrolide, 1,2,3-triazolide, and L-proline that complex reversibly with CO2. Through a combination of small-angle neutron scattering (SANS), electrical conductivity measurements, thermal gravimetric analysis, and molecular dynamics simulations, we show how small changes in charge reorganization and counterion shape and size induced by complexation with CO2 allow for fine-tunability of surfactant properties. We then use these findings to demonstrate a range of potential practical uses, from manipulating microemulsion droplet morphology to controlling micellar and vesicular aggregation. In particular, we focus on the binding of these surfactants to DNA and the reversible compaction of surfactant-DNA complexes upon alternate bubbling of the solution with CO2 and N2.
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Affiliation(s)
| | | | | | | | - César de la Fuente-Núñez
- Eli and Edythe L. Broad Institute of MIT and Harvard , 415 Main Street, Cambridge, Massachusetts 02142, United States
- Harvard Biophysics Program, Harvard University , Cambridge, Massachusetts 02138, United States
| | | | | | - William T Heller
- Biology and Soft Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
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143
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Ingr M, Kutálková E, Hrnčiřík J. Hyaluronan random coils in electrolyte solutions—a molecular dynamics study. Carbohydr Polym 2017; 170:289-295. [DOI: 10.1016/j.carbpol.2017.04.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 03/07/2017] [Accepted: 04/20/2017] [Indexed: 01/11/2023]
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144
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Huang X, Wu S, Ke X, Li X, Du X. Phosphonated Pillar[5]arene-Valved Mesoporous Silica Drug Delivery Systems. ACS APPLIED MATERIALS & INTERFACES 2017; 9:19638-19645. [PMID: 28530792 DOI: 10.1021/acsami.7b04015] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
To explore the diversity and promising applications of pillararene-based molecular machines, phosphonated pillar[5]arenes (PPA[5]) were synthesized to construct novel supramolecular nanovalves for the first time, based on mesoporous silica nanoparticles (MSNs) functionalized with choline and pyridinium moieties, respectively. PPA[5] encircled the choline or pyridinium stalks to construct supramolecular nanovalves for encapsulation of drugs within the MSN pores. PPA[5] showed a high binding affinity for the quaternary ammonium stalks through the host-guest interactions primarily via ion pairing between the phosphonate and quaternary ammonium moieties, in comparison with carboxylated pillar[5]arene (CPA[5]), to minimize premature drug release. The specific ion pairing between the phosphonate and quaternary ammonium moieties was elaborated for the first time to construct supramolecular nanovalves. The supramolecular nanovalves were activated by low pH, Zn2+ coordination, and competitive agents for controlled drug release, and release efficiency and antitumor efficacy were further enhanced when gold nanorod (GNR)-embedded MSNs (GNR@MSNs) were used instead under illumination of near-infrared (NIR) light, attributed to the synergistic effect of photothermo-chemotherapy. The constructed PPA[5]-valved GNR@MSN delivery system has promising applications in tumor photothermo-chemotherapy.
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Affiliation(s)
- Xuan Huang
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, and School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Shanshan Wu
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, and School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Xiaokang Ke
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, and School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Xueyuan Li
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, and School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Xuezhong Du
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, and School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
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145
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Leontidis E. Investigations of the Hofmeister series and other specific ion effects using lipid model systems. Adv Colloid Interface Sci 2017; 243:8-22. [PMID: 28395857 DOI: 10.1016/j.cis.2017.04.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 04/02/2017] [Indexed: 11/28/2022]
Abstract
From the ion point-of-view specific ion effects (SIE) arise as an interplay of ionic size and shape and charge distribution. However in aqueous systems SIE invariably involve water, and at surfaces they involve both interacting surface groups and local fields emanating from the surface. In this review we highlight the fundamental importance of ionic size and hydration on SIE, properties which encompass all types of interacting forces and ion-pairing phenomena and make the Hofmeister or lyotropic series of ions pertinent to a broad range of systems and phenomena. On the other hand ionic hydrophobicity and complexation capacity also determine ionic behavior in a variety of contexts. Over the years we have carried out carefully designed experiments on a few selected soft matter model systems, most involving zwitterionic phospholipids, to assess the importance of fundamental ionic and interfacial properties on ion specific effects. By tuning down direct Coulomb interactions, working with different interfacial geometries, and carefully tuning ion-lipid headgroup interactions it is possible to assess the importance of different parameters contributing to ion specific behavior. We argue that the majority of specific ion effects involving relatively simple soft matter systems can be at least qualitatively understood and demystified.
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146
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Ivanova VI, Stanimirova RD, Danov KD, Kralchevsky PA, Petkov JT. Sulfonated methyl esters, linear alkylbenzene sulfonates and their mixed solutions: Micellization and effect of Ca2+ ions. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.06.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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147
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Yadav SK, Kumar S. Counterion-specific clouding in aqueous anionic surfactant: a case of Hofmeister-like series. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4074-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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148
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Kedzior SA, Marway HS, Cranston ED. Tailoring Cellulose Nanocrystal and Surfactant Behavior in Miniemulsion Polymerization. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00516] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Stephanie A. Kedzior
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4L8
| | - Heera S. Marway
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4L8
| | - Emily D. Cranston
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4L8
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149
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Lutz-Bueno V, Liebi M, Kohlbrecher J, Fischer P. Intermicellar Interactions and the Viscoelasticity of Surfactant Solutions: Complementary Use of SANS and SAXS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2617-2627. [PMID: 28221812 DOI: 10.1021/acs.langmuir.6b04466] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In ionic surfactant micelles, basic interactions among distinct parts of surfactant monomers, their counterion, and additives are fundamental to tuning molecular self-assembly and enhancing viscoelasticity. Here, we investigate the addition of sodium salicylate (NaSal) to hexadecyltrimethylammonium chloride and bromide (CTAC and CTAB) and 1-hexadecylpyridinium chloride and bromide (CPyCl and CPyBr), which have distinct counterions and headgroup structures but the same hydrophobic tail. Different contrasts are obtained from small-angle neutron scattering (SANS), which probes differences between the nucleus of atoms, and X-rays SAXS, which probes differences in electron density. If combined, this contrast allows us to define specific intramicellar length scales and intermicellar interactions. SANS signals are sensitive to the contrast between the solvent (D2O) and the hydrocarbonic tails in the micellar core (hydrogen), and SAXS can access the inner structure of the polar shell because the headgroups, counterions, and penetrated salt have higher electron densities compared to the solvent and to the micellar core. The number density, intermicellar distances, aggregation number, and inter/intramicellar repulsions are discussed on the basis of the dependence of the structure factor and form factor on the micellar aggregate morphology. Therefore, we confirm that micellar growth can be tuned by variations in the flexibility and size of the the headgroup as well as the ionic dissociation rate of its counterion. Additionally, we show that the counterion binding is even more significant to the development of viscoelasticity than the headgroup structure of a surfactant molecule. This is a surprising finding, showing the importance of electrostatic charges in the self-assembly process of ionic surfactant molecules.
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Affiliation(s)
- Viviane Lutz-Bueno
- Institute of Food, Nutrition and Health, ETH Zurich , 8092 Zurich, Switzerland
| | | | | | - Peter Fischer
- Institute of Food, Nutrition and Health, ETH Zurich , 8092 Zurich, Switzerland
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150
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Wang XB. Cluster Model Studies of Anion and Molecular Specificities via Electrospray Ionization Photoelectron Spectroscopy. J Phys Chem A 2017; 121:1389-1401. [PMID: 28060511 DOI: 10.1021/acs.jpca.6b09784] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ion specificity, a widely observed macroscopic phenomenon in condensed phases and at interfaces, is a fundamental chemical physics issue. Herein we report our recent studies of such effects using cluster models in an "atom-by-atom" and "molecule-by-molecule" fashion not possible with the condensed-phase methods. We use electrospray ionization (ESI) to generate molecular and ionic clusters to simulate key molecular entities involved in local binding regions and characterize them by employing negative ion photoelectron spectroscopy (NIPES). Inter- and intramolecular interactions and binding configurations are directly obtained as functions of the cluster size and composition, providing molecular-level descriptions and characterization over the local active sites that play crucial roles in determining the solution chemistry and condensed-phase phenomena. The topics covered in this article are relevant to a wide range of research fields from ion specific effects in electrolyte solutions, ion selectivity/recognition in normal functioning of life, to molecular specificity in aerosol particle formation, as well as in rational material design and synthesis.
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Affiliation(s)
- Xue-Bin Wang
- Physical Sciences Division, Pacific Northwest National Laboratory , P.O. Box 999, MS K8-88, Richland, Washington 99352, United States
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