2019
DOI: 10.1021/acs.langmuir.9b01311
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Effect of Interfacial Water on the Nanomechanical Properties of Negatively Charged Floating Bilayers Supported on Gold Electrodes

Abstract: Floating lipid bilayers composed of phosphatidylglycerols and cardiolipin were deposited on gold electrodes premodified with 1-thio-β-d-glucose monolayer by spreading of small unilamellar vesicles. The resulting lipid membrane was homogeneous, and its thickness was ∼5.0 nm. Electrochemical characterization combined with surface-enhanced infrared absorption spectroscopy revealed that negative polarization of the electrode leads to accumulation of water molecules in the interfacial region between lipid membrane … Show more

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Cited by 15 publications
(15 citation statements)
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“…For example, the Young's moduli found for lipid bilayers immobilized on mica vary from 18 MPa to 40 MPa depending on physical state of the membrane [27,28] . Similar range of values was also reported for floating bilayer lipid membranes (fBLM) [29] . The latter possess water cushion between lipid membrane and the electrode modified with hydrophilic monolayer (e. g. thioglucose).…”
Section: Resultssupporting
confidence: 60%
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“…For example, the Young's moduli found for lipid bilayers immobilized on mica vary from 18 MPa to 40 MPa depending on physical state of the membrane [27,28] . Similar range of values was also reported for floating bilayer lipid membranes (fBLM) [29] . The latter possess water cushion between lipid membrane and the electrode modified with hydrophilic monolayer (e. g. thioglucose).…”
Section: Resultssupporting
confidence: 60%
“…Namely, the amount and the structure of submembrane water may be substantially altered and consequently, it may affect nanomechanical properties of the membrane. As we demonstrated recently, the growth of water cushion separating the lipid membrane from the electrode surface leads to gradual decrease of the Young's modulus [29] . Therefore, relatively low value of the modulus determined for stBLM may indicate that submembrane water reservoir is thicker compared with fBLMs as well as other lipid membranes, which are deposited directly on the supporting surface.…”
Section: Resultsmentioning
confidence: 77%
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“…The minimum of the v(O-H) band is located at ~3225 cm −1 and it contains a visible shoulder at ~3350 cm −1 . The ν(O-H) bands within this spectral region correspond to the water molecules in a network of hydrogen bonds [30][31][32]. Hence, the emergence of the negative ν(O-H) band indicates that the adsorption of bicelles involves the replacement of hydrogen-bonded water from the interfacial region.…”
Section: Resultsmentioning
confidence: 98%