Measurement of Forces between Supported Cationic Bilayers by Colloid Probe Atomic Force Microscopy: Electrolyte Concentration and Composition

Leivers, Matthew; Seddon, John M.; Declercq, Marc; Robles, Eric S. J.; Luckham, P.F.

doi:10.1021/acs.langmuir.8b03555

Cited by 7 publications

(9 citation statements)

References 51 publications

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“…This suggestion might be in contrast to a general assumption that SLBs do not fluctuate due to their strong interaction with the substrates. 19,25 Our measurements on DOAB, DTDAB, and DODAB systems might cast doubt on whether such an assumption always holds true or not. X-ray or neutron scattering methods have been also applied to measure dynamic properties of soft materials supported on solid substrates and they yield fruitful information.…”

Section: Resultsmentioning

confidence: 91%

Dynamic Light Scattering Measurements for Soft Materials on Solid Substrates: Employing Evanescent-wave Illumination and Dark-field Collection with a High Numerical Aperture Microscope Objective

Morisaku

Sunada

Miyazaki³

et al. 2020

ANAL. SCI.

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We developed an instrument that allows us to measure dynamic light scattering from soft materials on solid substrates by avoiding strong background due to the reflection light from substrates. In the instrument, samples on substrates are illuminated by evanescent-light field and the resultant scattered light from the samples is collected with a dark-field optical configuration by employing a high numerical aperture microscope objective. We applied the instrument to measure the dynamic properties of supported lipid bilayers (SLBs), which have been widely utilized in industries as functional materials such as biosensors. From the time course of the scattered light from the SLBs, the power spectrum with the broad peak ranging from 10 to 20 kHz is observed. The use of the microscope objectives enables us to apply the instrument to future light scattering imaging for dynamic properties of soft materials supported on various substrates by combining with conventional microscope systems.

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Section: Resultsmentioning

confidence: 91%

Dynamic Light Scattering Measurements for Soft Materials on Solid Substrates: Employing Evanescent-wave Illumination and Dark-field Collection with a High Numerical Aperture Microscope Objective

Morisaku

Sunada

Miyazaki³

et al. 2020

ANAL. SCI.

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“…Such a celebrated theory is based on the assumption that interactions can be expressed as a superposition of two main components: an attractive and short-range van der Waals potential and a repulsive long-range one, described as an electric double layer (EDL). In charged vesicle suspensions of industrial interest, however, the EDL repulsion is often found to be the only relevant component, while the van der Waals contribution is definitely negligible [8,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…The values of the interaction strength and range used in our simulations are taken from recent experiments that directly measured the force between bilayers of cationic quaternary ammonium surfactants in solutions, over a wide range of halide salts concentrations. In particular, we focus on the measurement in the presence of NaI salt at four different concentrations [14]; lowering the salt concentration corresponds, in our simulations, to increasing strength and range of the EDL repulsion. The volume fraction is varied between 0.02 and 0.55, enclosing the range of dilution typically used in real production [8].…”

Section: Introductionmentioning

confidence: 99%

Understanding charged vesicle suspensions as Wigner glasses: dynamical aspects

Porpora

Rusciano

Guida

et al. 2020

J. Phys.: Condens. Matter

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Suspensions of charged vesicles in water with added salt are widespread in nature and industrial production. Here we investigate, via Brownian dynamics simulations, a model that grasps the key features of these systems, with bidisperse colloidal beads interacting via a hard-core and an electrostatic double layer potential. Our goal is to focus on a set of interaction parameters that is not generic but measured in recent experiments, and relevant for a class of consumer products, such as liquid fabric softeners. On increasing the volume fraction in a range relevant to real formulation, we show that the dynamics become progressively slower and heterogeneous, displaying the typical signatures of an approaching glass transition. On lowering the salt concentration, which corresponds to increasing the strength and range of the electrostatic repulsion, the emergence of glassy dynamics becomes significantly steeper, and, remarkably, occurs at volume fractions well below the hard-sphere glass transition. The volume fraction dependence of the structural relaxation time at different salt concentration is well described through a functional law inspired by a recently proposed model (Krausser et al 2015 Proc. Natl Acad. Sci. USA 112 13762). According to our results, the investigated system may be thought of as a Wigner glass, i.e. a low-density glassy state stabilized by long-range repulsive interactions. Overall, our study suggests that glassy dynamics plays an important role in controlling the stability of these suspensions.

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“…In contrast, surface force measurements by AFM allow us to investigate various surfaces. (10)(11)(12) We often employ colloidal probes in AFM measurements, for which a silica or polystyrene colloid with a diameter of several to several tens of µm [Fig. 1(a)] is fixed at the end of the cantilever.…”

Section: Interactions In Water: Dlvo and Non-dlvo Forcesmentioning

confidence: 99%

Lab on a Tip: Atomic Force Microscopy as a Versatile Analytical Tool for Nano-bioscience

Mondarte¹,

Tahara²,

Suthiwanich³

et al. 2021

Sensors and Materials

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Scanning probe microscopy (SPM) is a powerful method for visualizing the structure of materials at the nanoscale. In particular, atomic force microscopy (AFM) has become one of the most used analytical tools in various fields such as physics, chemistry, and biology. Here, we introduce representative works in nano-bioscience. First, we look back on the history of SPM and introduce the application of AFM in this field. Next, we review surface force and singlemolecule force measurements, which unveiled molecular processes at biointerfaces. Surface force measurements revealed the mechanism underlying the macroscopically observed protein and cell resistance of artificial monolayers and biomolecules. Meanwhile, single-molecule force spectroscopy has enabled researchers to explore the complex interaction of biomolecules from a microscopic viewpoint. These findings will contribute not only to the fundamental understanding of biomolecular processes but also to the design of new nano-biodevices.

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Measurement of Forces between Supported Cationic Bilayers by Colloid Probe Atomic Force Microscopy: Electrolyte Concentration and Composition

Cited by 7 publications

References 51 publications

Dynamic Light Scattering Measurements for Soft Materials on Solid Substrates: Employing Evanescent-wave Illumination and Dark-field Collection with a High Numerical Aperture Microscope Objective

Dynamic Light Scattering Measurements for Soft Materials on Solid Substrates: Employing Evanescent-wave Illumination and Dark-field Collection with a High Numerical Aperture Microscope Objective

Understanding charged vesicle suspensions as Wigner glasses: dynamical aspects

Lab on a Tip: Atomic Force Microscopy as a Versatile Analytical Tool for Nano-bioscience

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