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Hmam O, Côté-Dubuc F, Badia A. Gold-Supported Lipid Membranes Formed by Redox-Triggered Vesicle Fusion on Binary Self-Assembled Monolayers: Ion-Pairing Association and Surface Hydrophilicity. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37223998 DOI: 10.1021/acsami.3c03526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The assembly of biomimetic, planar supported lipid bilayers (SLBs) by the popular vesicle fusion method, which relies on the spontaneous adsorption and rupture of small unilamellar vesicles from aqueous solution on a solid surface, typically works with a limited range of support materials and lipid systems. We previously reported a conceptual advance in the formation of SLBs from vesicles in the gel or fluid phase using the interfacial ion-pairing association of charged phospholipid headgroups with electrochemically generated cationic ferroceniums bound to a self-assembled monolayer (SAM) chemisorbed to gold. This redox-driven approach lays down a single bilayer membrane on the SAM-modified gold surface at room temperature within minutes and is compatible with both anionic and zwitterionic phospholipids. The present work explores the effects of the surface ferrocene concentration and hydrophobicity/hydrophilicity on the formation of continuous SLBs of dialkyl phosphatidylserine, dialkyl phosphatidylglycerol, and dialkyl phosphatidylcholine using binary SAMs of ferrocenylundecanethiolate (FcC11S) and dodecanethiolate (CH3C11S) or hydroxylundecanethiolate (HOC11S) comprising different surface mole fractions of ferrocene (χFcsurf). An increase in the surface hydrophilicity and surface free energy of the FcC11S/HOC11S SAM mitigates the decrease in the attractive ion-pairing interactions resulting from a reduced χFcsurf. SLBs of ≳80% area coverage form on the FcC11S/HOC11S SAM for all the phospholipid types down to χFcsurf of at least 0.2, composition yielding a water contact angle (θW) of 44 ± 4°. By contrast, a greater number of ion-pairing interactions is required on the hydrophobic FcC11S/CH3C11S surface to drive the vesicle fusion process; bilayers or bilayer patches form at χFcsurf ≳ 0.6 (θW = 97 ± 3°). These findings will aid in tailoring the surface chemistry of redox-active modified surfaces to widen the conditions that yield supported lipid membranes.
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Affiliation(s)
- Ons Hmam
- Département de chimie, Quebec Centre for Advanced Materials and Regroupement québécois sur les matériaux de pointe, Université de Montréal, Complexe des sciences, C.P. 6128, succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada
| | - Félix Côté-Dubuc
- Département de chimie, Quebec Centre for Advanced Materials and Regroupement québécois sur les matériaux de pointe, Université de Montréal, Complexe des sciences, C.P. 6128, succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada
| | - Antonella Badia
- Département de chimie, Quebec Centre for Advanced Materials and Regroupement québécois sur les matériaux de pointe, Université de Montréal, Complexe des sciences, C.P. 6128, succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada
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Jia R, Bai H, He Y. Electrochemical Determination of Homocysteine Using Self-Assembled 6-Ferrocenylhexanethiol on a Molybdenum Disulfide Nanoparticle Modified Glassy Carbon Electrode (GCE). ANAL LETT 2022. [DOI: 10.1080/00032719.2022.2138421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ruihong Jia
- Department of Pharmacy, Changzhi Medical College, Changzhi, P.R. China
| | - Huiyun Bai
- Department of Pharmacy, Changzhi Medical College, Changzhi, P.R. China
| | - Yanbin He
- Department of Pharmacy, Changzhi Medical College, Changzhi, P.R. China
- Shanxi Province Key Laboratory of Functional Food with Homologous of Medicine and Food, Changzhi, P.R. China
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3
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Sagara T, Hagi Y, Toyohara M. Binding of Sulfate-Terminated Surfactants with Different Alkyl Chain Lengths to Viologen Sites Covalently Embedded in the Interior of a Self-Assembled Monolayer on a Au Electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:979-986. [PMID: 35029392 DOI: 10.1021/acs.langmuir.1c02376] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We investigated the binding of anionic surfactants of lower concentrations than their critical micelle concentrations (cmcs) to the cationic redox-active viologen site in the interior of a self-assembled monolayer (SAM) on a polycrystalline Au electrode. We embedded the viologen site in the midway of the alkyl chain to facilitate the ion-pairing binding, which depends on the oxidation state of the viologen. We found that the binding of anionic surfactants and inorganic anions causes a negative shift of the formal potential of the redox couple of the viologen radical cation/viologen dication in line with the binding equilibrium. In contrast, the anion binding was weak and trivial when viologens are located at the SAM surface, indicative of the enhancement of the binding by the electrostatic interaction in the microenvironment with the low dielectric constant. The negative shift of the formal potential of viologen in the interior was greater for the surfactants with longer alkyl chain lengths, indicative of the efficacy of the alkyl chain-chain interaction. The chain-length-dependent potential shift followed the linear Traube rule but with a smaller slope than that in the original rule. We also demonstrated that the conjugated layer of the viologen SAM with dodecyl sulfate at a lower concentration than the cmc completely blocks the direct electron transfer (ET) from the Au electrode to solution-phase Fe(CN)63- but allows mediated ET around the formal potential of the viologen.
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Affiliation(s)
- Takamasa Sagara
- Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Nagasaki, Nagasaki 852-8121, Japan
| | - Youichi Hagi
- Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521, Japan
| | - Masaki Toyohara
- Department of Advanced Technology and Science for Sustainable Development, Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
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Kasuya M, Kubota D, Fujii S, Kurihara K. Nano-confined electrochemical reaction studied by electrochemical surface forces apparatus. Faraday Discuss 2021; 233:206-221. [PMID: 34889350 DOI: 10.1039/d1fd00060h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrochemical reactions in a nano-space are different from those in bulk solutions due to structuring of the liquid molecules and peculiar ion behavior at the electric double layer and are important for applications involving sensors and energy devices. The electrochemical surface forces apparatus (EC-SFA) we developed enabled us to study the electrochemical reactions in a solution nano-confined between the electrodes with varying distance (D) at nm resolution. We recorded measurements of the current-distance profiles due to the electrochemical reaction of the redox couples in the electrolyte nano-confined between Pt electrodes using our EC-SFA. We observed a long-range feedback current due to redox cycling and the sudden current increase at a short distance, the latter for the first time. This sudden current increase was two orders greater than the conventional feedback current and was observed at D < 5 nm when the electrodes were approaching and D < 200 nm on separation. We simultaneously measured the electric double layer force and the current between the electrodes in the solution to study the mechanisms of this sudden current increase in the short distance range. The results revealed a molecular insight as to how the redox species affect the current between two electrodes under nano-confinement. This study demonstrated that EC-SFA is a powerful tool for obtaining fundamental knowledge about the nano-confined electrochemical reactions for nanoelectrodes which can be applied to sensors and energy devices.
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Affiliation(s)
- Motohiro Kasuya
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
| | - Daiki Kubota
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
| | - Sho Fujii
- Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Kazue Kurihara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. .,Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan.,New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8578, Japan
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Malik H, Saha P, Patra K, Bera JK, Gopakumar TG. Solvent- and Temperature-Dependent Assembly in Monolayer Films of a Ferrocene-Naphthyridine Hybrid on HOPG. Chem Asian J 2021; 16:1430-1437. [PMID: 33830680 DOI: 10.1002/asia.202100187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/05/2021] [Indexed: 11/06/2022]
Abstract
The formation of a monolayer film of bis-naphthyridyl ferrocene on highly oriented pyrolytic graphite (HOPG) at ambient conditions is demonstrated. The films are prepared by drop casting from different solvents. The microscopic structure of the films is understood using atomic force microscopy (AFM) and scanning tunnelling microscopy (STM). The analysis reveals two different types of Phases (I and II) in the films and the relative percentage of these phases depends on the nature of the solvents used for the preparation and the thermodynamical condition. Solvents like methanol, acetonitrile and DMF exclusively select Phase-I, whereas acetone and ethanol show a mix of both phases at room temperature. The different phases are formed by different conformers of the molecule. We also show that the selectivity of one of the phases over the other is related to the difference in the energetics for the formation of these phases.
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Affiliation(s)
- Himani Malik
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208016, India
| | - Prithwidip Saha
- Aix-Marseille Université, INSERM, CNRS, LAI, 13009, Marseille, France
| | - Kamaless Patra
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208016, India
| | - Jitendra K Bera
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208016, India
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Burnett ME, Bodiford N, Goulet ME, Coffer JL, Green KN. Environmental effects of chitosan as an immobilization medium for electrochemically active small molecules. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1655550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Marianne E. Burnett
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, TX, USA
| | - Nelli Bodiford
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, TX, USA
| | - Meghen E. Goulet
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, TX, USA
| | - Jeffery L. Coffer
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, TX, USA
| | - Kayla N. Green
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, TX, USA
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Abstract
Abstract
This article reviews the surface forces measurement as a novel tool for materials science. The history of the measurement is briefly described in the Introduction. The general overview covers specific features of the surface forces measurement as a tool for studying the solid-liquid interface, confined liquids and soft matter. This measurement is a powerful way for understanding interaction forces, and for characterizing (sometime unknown) phenomena at solid-liquid interfaces and soft complex matters. The surface force apparatus (SFA) we developed for opaque samples can study not only opaque samples in various media, but also electrochemical processes under various electrochemical conditions. Electrochemical SFA enables us to determine the distribution of counterions between strongly bound ones in the Stern layer and those diffused in the Gouy-Chapman layer. The shear measurement is another active area of the SFA research. We introduced a resonance method, i.e. the resonance shear measurement (RSM), that is used to study the effective viscosity and lubricity of confined liquids in their thickness from μm to contact. Advantages of these measurements are discussed by describing examples of each measurement. These studies demonstrate how the forces measurement is used for characterizing solid-liquid interfaces, confined liquids and reveal unknown phenomena. The readers will be introduced to the broad applications of the forces measurement in the materials science field.
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Dionne ER, Dip C, Toader V, Badia A. Micromechanical Redox Actuation by Self-Assembled Monolayers of Ferrocenylalkanethiolates: Evens Push More Than Odds. J Am Chem Soc 2018; 140:10063-10066. [PMID: 30070479 DOI: 10.1021/jacs.8b04054] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Microcantilever transducers can be valuable tools for the investigation of physicochemical processes in organized molecular films. Gold-coated cantilevers are used here to investigate the electrochemomechanics of redox-active self-assembled monolayers (SAMs) of ferrocenylalkanethiolates (Fc(CH2) nS) of different alkyl chain lengths. A significant odd-even effect is observed in the surface stress and cantilever movement generated by the oxidation of the SAM-confined ferrocenes as the number of methylene units n in the SAM backbone is varied. We demonstrate that stronger alkyl chain-chain interactions are at the origin of the larger surface stresses generated by SAMs with an even versus odd n. The findings highlight the impact of subtle structural effects and weak van der Waals interactions on the mechanical actuation produced by redox reactions in self-assembled systems.
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Affiliation(s)
- Eric R Dionne
- Département de chimie , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada.,Quebec Center for Advanced Materials , FRQNT , Canada
| | - Christopher Dip
- Département de chimie , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada.,Quebec Center for Advanced Materials , FRQNT , Canada
| | - Violeta Toader
- Department of Chemistry , McGill University , 801 rue Sherbrooke Ouest , Montréal , QC H3A 2K6 , Canada.,Quebec Center for Advanced Materials , FRQNT , Canada
| | - Antonella Badia
- Département de chimie , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada.,Quebec Center for Advanced Materials , FRQNT , Canada
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Ren HY, Mizukami M, Kurihara K. Preparation of stable silica surfaces for surface forces measurement. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:095108. [PMID: 28964215 DOI: 10.1063/1.4986613] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/26/2017] [Indexed: 06/07/2023]
Abstract
A surface forces apparatus (SFA) measures the forces between two surfaces as a function of the surface separation distance. It is regarded as an essential tool for studying the interactions between two surfaces. However, sample surfaces used for the conventional SFA measurements have been mostly limited to thin (ca. 2-3 μm) micas, which are coated with silver layers (ca. 50 nm) on their back, due to the requirement of the distance determination by transmission mode optical interferometry called FECO (fringes of equal chromatic order). The FECO method has the advantage of determining the absolute distance, so it should be important to increase the availability of samples other than mica, which is chemically nonreactive and also requires significant efforts for cleaving. Recently, silica sheets have been occasionally used in place of mica, which increases the possibility of surface modification. However, in this case, the silver layer side of the sheet is glued on a cylindrical quartz disc using epoxy resin, which is not stable in organic solvents and can be easily swollen or dissolved. The preparation of substrates more stable under severe conditions, such as in organic solvents, is necessary for extending application of the measurement. In this study, we report an easy method for preparing stable silica layers of ca. 2 μm in thickness deposited on gold layers (41 nm)/silica discs by sputtering, then annealed to enhance the stability. The obtained silica layers were stable and showed no swelling in organic solvents such as ethanol and toluene.
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Affiliation(s)
- Huai-Yin Ren
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Masashi Mizukami
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, Sendai 980-8577, Japan
| | - Kazue Kurihara
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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10
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Kurihara K. Molecular Architecture Studied by the Surface Forces Measurement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12290-12303. [PMID: 27807975 DOI: 10.1021/acs.langmuir.6b03074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This feature article reviews the surface forces measurement as a tool for studying molecular architecture chemistry. The history of the measurement is briefly described in the Introduction. The general overview covers specific features of the surface forces measurement as a tool for studying and using molecular architecture. This measurement is powerful for understanding interaction forces and for characterizing and discovering the phenomena at solid-liquid interfaces and soft complex matter. An apparatus for opaque samples was developed, which can be used to study not only opaque samples in various media but also electrochemical processes under various electrochemical potentials. Our studies of molecular architecture are reviewed; they include biological molecular recognition especially involved in the enzyme-substrate interaction; polyelectrolyte brushes exhibiting steric repulsion, which can be reproduced by the osmotic pressure of the counterions, and a density-dependent transition; the hydrogen-bonded molecular macrocluster formation of alcohol and carboxylic acids adsorbed on silica in nonpolar solvents such as cyclohexane; and surface forces between ferrocene-modified electrodes under various applied potentials. These studies demonstrate how the forces measurement is used to identify interacting species such as in biological systems to reveal unknown phenomena and to characterize soft complex matter and the effective potential of the electrodes. Readers will be introduced to the broad applications of the force measurement.
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Affiliation(s)
- Kazue Kurihara
- Institute of Multidisciplinary Research for Advanced Materials & Advanced Institute for Materials Research, Tohoku University , Katahira, Aoba-ku, Sendai 980-8577, Japan
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Sen S, Palmore GTR. Stimuli-Responsive Macromolecular Composites: Enhanced Stress Modulation in Polypyrrole with Redox-Active Dopants. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01444] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- S. Sen
- Department of Chemistry and ‡School of Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - G. T. R. Palmore
- Department of Chemistry and ‡School of Engineering, Brown University, Providence, Rhode Island 02912, United States
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12
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Britton J, Cousens NEA, Coles S, van Engers CD, Babenko V, Murdock AT, Koós A, Perkin S, Grobert N. A graphene surface force balance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:11485-92. [PMID: 25171130 PMCID: PMC4386928 DOI: 10.1021/la5028493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/26/2014] [Indexed: 05/06/2023]
Abstract
We report a method for transferring graphene, grown by chemical vapor deposition, which produces ultraflat graphene surfaces (root-mean-square roughness of 0.19 nm) free from polymer residues over macroscopic areas (>1 cm(2)). The critical step in preparing such surfaces involves the use of an intermediate mica template, which itself is atomically smooth. We demonstrate the compatibility of these model surfaces with the surface force balance, opening up the possibility of measuring normal and lateral forces, including friction and adhesion, between two graphene sheets either in contact or across a liquid medium. The conductivity of the graphene surfaces allows forces to be measured while controlling the surface potential. This new apparatus, the graphene surface force balance, is expected to be of importance to the future understanding of graphene in applications from lubrication to electrochemical energy storage systems.
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Affiliation(s)
- Jude Britton
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Nico E. A. Cousens
- Department
of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Samuel
W. Coles
- Department
of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | | | - Vitaliy Babenko
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Adrian T. Murdock
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Antal Koós
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Susan Perkin
- Department
of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Nicole Grobert
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
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