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Bera PK, Kandar AK, Krishnaswamy R, Fontaine P, Impéror-Clerc M, Pansu B, Constantin D, Maiti S, Sanyal MK, Sood AK. Grazing Incidence X-ray Diffraction Studies of Lipid-Peptide Mixed Monolayers during Shear Flow. ACS OMEGA 2020; 5:14555-14563. [PMID: 32596593 PMCID: PMC7315600 DOI: 10.1021/acsomega.0c01261] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 04/10/2020] [Indexed: 05/20/2023]
Abstract
Grazing incidence X-ray diffraction (GIXD) studies of monolayers of biomolecules at an air-water interface give quantitative information of in-plane packing, coherence length of crystalline domains, etc. Rheo-GIXD measurements can reveal quantitative changes in the nanocrystalline domains of a monolayer under shear. Here, we report GIXD studies of monolayers of alamethicin peptide, DPPC lipid, and their mixtures at an air-water interface under steady shear stress. The alamethicin monolayer and the mixed monolayer show a flow jamming transition. On the other hand, the pure 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) monolayer under constant stress flows steadily with a notable enhancement of the area/molecule and coherence lengths, suggesting the fusion of nanocrystallites during flow. The DPPC-alamethicin mixed monolayer shows no significant change in the area/DPPC molecule, but the coherence lengths of the individual phases (DPPC and alamethicin) increase, suggesting that the crystallites of individual phases grow bigger by merging of domains. More phase separation occurs in the system during flow. Our results show that rheo-GIXD has the potential to explore in situ molecular structural changes under rheological conditions for a diverse range of confined biomolecules at interfaces.
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Affiliation(s)
- Pradip K. Bera
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - Ajoy K. Kandar
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
- Soft Condensed Matter,
Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Rema Krishnaswamy
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
- School of Liberal
Studies, Azim Premji University, Bangalore 560100, India
| | - Philippe Fontaine
- SOLEIL Synchrotron, L’Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette
Cedex, France
| | - Marianne Impéror-Clerc
- Laboratoire de Physique des
Solides, Unité Mixte de Recherche 8502 Centre National de la
Recherche Scientifique, Université
Paris-Sud 11, 91405 Orsay Cedex, France
| | - Brigitte Pansu
- Laboratoire de Physique des
Solides, Unité Mixte de Recherche 8502 Centre National de la
Recherche Scientifique, Université
Paris-Sud 11, 91405 Orsay Cedex, France
| | - Doru Constantin
- Laboratoire de Physique des
Solides, Unité Mixte de Recherche 8502 Centre National de la
Recherche Scientifique, Université
Paris-Sud 11, 91405 Orsay Cedex, France
| | - Santanu Maiti
- Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - Milan K. Sanyal
- Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - A. K. Sood
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
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El Haitami A, Goldmann M, Fontaine P, Fauré MC, Cantin S. Inorganic mixed phase templated by a fatty acid monolayer at the air-water interface: the Mn and Mg case. Phys Chem Chem Phys 2018; 20:6629-6637. [PMID: 29457172 DOI: 10.1039/c8cp00308d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We studied by means of Grazing Incidence X-ray Diffraction (GIXD) coupled with X-ray fluorescence spectroscopy the structure of a behenic acid monolayer spread at the surface of Mg2+/Mn2+ mixed aqueous solutions. For the pure Mg2+ and Mn2+ aqueous solutions, the cations induce at the surface different 2D lattice superstructures of the organic monolayer. These superstructures correspond to an inorganic organized monolayer anchored to the hydrophilic group of the ordered behenic acid monolayer. Among the various diffraction peaks, we focused on those characteristics of the behenic acid oblique cell. As the Mg2+ mole fraction x increases in the Mg2+/Mn2+ mixed subphase, a continuous evolution of the oblique cell parameters is observed indicating the insertion of Mg2+ cations in the Mn2+ ordered monolayer. Then, a further increase leads to the appearance of a coexistence between two oblique surface phases. The cell parameters of both phases evolve continuously along the x range of the transition until a single Mg-rich ordered phase is detected. However, although the intensities of the peaks in the coexistence region are in agreement with a first-order phase transition, the cell parameters evolve simultaneously. Considering a thermodynamics analysis, this evidences that, apart from the concentration, another unidentified intensive parameter is varying. We suggest that it is the ionic strength, which appears to be strongly related to the concentrations.
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Affiliation(s)
- Alae El Haitami
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI, EA 2528), Institut des Matériaux, Université de Cergy-Pontoise, 5 mail Gay-Lussac Neuville/Oise, 95031 Cergy-Pontoise Cedex, France.
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Harish T S, Viswanath P. Effect of cations on condensation of a mesogenic amphiphilic molecule at the air-aqueous electrolyte interface. Phys Chem Chem Phys 2014; 16:1276-82. [PMID: 24296755 DOI: 10.1039/c3cp53751j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the interactions of a mesogenic molecule, 4'-octyl-4-biphenyl-carbonitrile (8CB), with some cations (Na(+), Cu(2+), Ni(2+), La(3+) and Al(3+)) dissolved in the aqueous subphase. Surface manometry studies show that the di- (Ni(2+) and Cu(2+)) and trivalent (La(3+)) ions promote condensation in the area per molecule and enhance the stability of the monolayer. This is inferred from the increase in the values of collapse pressure and the compression elastic modulus. The specific ion effect is seen between perchlorate and chloride anions with respect to the Al(3+) cation. The presence of monovalent ions (Na(+)) in the subphase does not influence the isotherm of 8CB. However, in this case, with pH (>6), the isotherm shifts to a higher area per molecule. The excess Gibbs free energy calculated for the 8CB monolayer indicates repulsive interaction for monovalent ions and attractive interaction for multivalent ions in the subphase. Kinetic studies of the monolayer in an ion-enriched subphase have yielded an additional characteristic time constant indicative of reorganization of the monolayer. Ellipsometric adsorption isotherm measurements carried out for representative ions show a reduction in the value of the ellipsometric angle with increasing valency. Our studies indicate that the interaction of ions with the 8CB monolayer at the air-electrolyte interface can be promoted by choosing cations of higher valency and anions of larger size, higher polarizability and chaotropic nature. These factors play an important role and can potentially affect the anchoring transition.
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Affiliation(s)
- Shilpa Harish T
- Centre for Soft Matter Research, P.B. No. 1329, Jalahalli, Bangalore - 560 013, India.
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Cantin S, Fauré MC, Perrot F, Goldmann M. Structure and kinetics of fatty acid Langmuir monolayers on zinc salt solutions. J Phys Chem B 2013; 117:16275-82. [PMID: 24283749 DOI: 10.1021/jp407047a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The adsorption of zinc cations under behenic acid Langmuir monolayers was investigated by means of isotherm measurements, grazing incidence X-ray diffraction and Brewster angle microscopy. The structure of the films was characterized as a function of Zn(2+) concentration, for three different counterions (chloride, iodide, bromide) and at two subphase pHs (5.5 and 7.5). At pH 5.5 and in the studied concentration range, Zn(2+) adsorption leads to a condensation of the fatty acid monolayer with the same phase transitions as over pure water. In contrast, at higher pH the organic X-phase is evidenced immediately above a concentration threshold without any ion organization. Even though Cu(2+) and Zn(2+)cations induce both the fatty acid X-phase, the kinetics of its formation appears strongly different. Indeed, as for Mg(2+) and Cd(2+), the intermediate new I-structure is evidenced in the course of Zn(2+) adsorption although superstructures are observed only for Mg(2+) and Cd(2+). However, for Zn(2+), the I-phase evolves to the final state through a new structure called X' and a continuous X'-X transition. Finally, any effect of the counterion is evidenced neither during the kinetic process nor in the final state.
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Affiliation(s)
- Sophie Cantin
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI, EA 2528), Institut des Matériaux, Université de Cergy-Pontoise , 5 mail Gay-Lussac Neuville/Oise, 95031 Cergy-Pontoise Cedex, France
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de Ruiter R, Tjerkstra RW, Duits MHG, Mugele F. Influence of cationic composition and pH on the formation of metal stearates at oil-water interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8738-8747. [PMID: 21678925 DOI: 10.1021/la2010562] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We study the formation of layers of metal stearates at the interface between a decane solution of stearic acid and aqueous salt solutions of variable composition and pH by monitoring the evolution of their mechanical, optical, and chemical properties as a function of time after formation of the interface. For values of the pH below the pK(a) of stearic acid hardly any interfacial activity is observed. For pH > pK(a), stearic acid deprotonates at the interface and forms metal stearates, eventually leading to the formation of macroscopic solid layers. Dynamic interfacial tension measurements reveal that the process takes place in several stages, which we attribute to the successive formation of dilute and dense monolayers followed by three-dimensional growth. In the presence of divalent ions, the solid layers display a significant increase in the dilatational storage modulus. Experiments performed with an aqueous phase containing multiple cation species (artificial seawater) give rise to particularly pronounced growth of solid layers, which preferentially incorporate Ca(2+) as revealed by X-ray photoelectron and infrared spectroscopy. Our results highlight in particular the importance of the complex synergistic effects of simultaneously present monovalent and divalent cation species on the interfacial adsorption.
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Affiliation(s)
- Riëlle de Ruiter
- Physics of Complex Fluids, Faculty of Science and Technology, IMPACT and MESA+ Institutes, University of Twente, Enschede, The Netherlands.
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Cantin S, Péralta S, Fontaine P, Goldmann M, Perrot F. Evolution toward the X phase of fatty acid Langmuir monolayers on a divalent cation solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:830-837. [PMID: 19719160 DOI: 10.1021/la9022823] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The structure of docosanoic acid monolayers spread over chloride salt solutions of copper was investigated by means of isotherm measurements, grazing incidence X-ray diffraction, and Brewster angle microscopy, as a function of the ion concentration and at two subphase pHs (5.5 and 7.5). The X phase is evidenced immediately above a concentration threshold which depends on the pH. The sequence of phases leading to this rigid phase involves two different processes depending on the pH. The initial L(2h) phase evolves toward an X-like phase through a phase transition which is first order at pH 7.5 while it is second order at pH 5.5. The transition is then followed by a continuous evolution toward the X phase.
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Affiliation(s)
- Sophie Cantin
- Laboratoire de Physico-Chimie des Polymères et des Interfaces (LPPI, EA 2528), Université de Cergy-Pontoise, 5 mail Gay-Lussac Neuville/Oise, 95031 Cergy-Pontoise Cedex, France.
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DiMasi E, Kwak SY, Pichon BP, Sommerdijk NAJM. Structural adaptability in an organic template for CaCO3 mineralization. CrystEngComm 2007. [DOI: 10.1039/b711153c] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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