Visualization of Ion Distribution at the Mica−Electrolyte Interface

Loh, Siu Hong; Jarvis, Suzanne P.

doi:10.1021/la1011378

Cited by 92 publications

(137 citation statements)

References 14 publications

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…7). The presence of small kosmotropic ions sitting between the main binding sites has already been reported in previous AFM studies 34 and RAXR experiments have also shown that In each case, a simulation snapshot with semi-transparent water molecules is shown (top) together with the corresponding IDM image (bottom). All the IDM data were acquired with a similar cantilever/tip and in identical operating conditions.…”

Section: Discussionsupporting

confidence: 55%

“…When operated in liquid, AFM is able to investigate solid-liquid interfaces locally, often with atomic-or molecular-level resolution [22][23][24][25][26][27][28][29][30][31] and in the presence of ions [32][33][34][35][36] . Studies allowing a clear and unequivocal identification of single ions within a Stern layer are however still sparse, with little information about the formation, stability and dynamics of adsorbed ions at the nanoscale.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Water-induced correlation between single ions imaged at the solid–liquid interface

2014

View full text Add to dashboard Cite

When immersed into water, most solids develop a surface charge, which is neutralized by an accumulation of dissolved counterions at the interface. Although the density distribution of counterions perpendicular to the interface obeys well-established theories, little is known about counterions' lateral organization at the surface of the solid. Here we show, by using atomic force microscopy and computer simulations, that single hydrated metal ions can spontaneously form ordered structures at the surface of homogeneous solids in aqueous solutions. The structures are laterally stabilized only by water molecules with no need for specific interactions between the surface and the ions. The mechanism, studied here for several systems, is controlled by the hydration landscape of both the surface and the adsorbed ions. The existence of discrete ion domains could play an important role in interfacial phenomena such as charge transfer, crystal growth, nanoscale self-assembly and colloidal stability.

show abstract

Section: Discussionsupporting

confidence: 55%

mentioning

confidence: 99%

Water-induced correlation between single ions imaged at the solid–liquid interface

2014

View full text Add to dashboard Cite

show abstract

“…This repeat spacing is consistent with the lattice spacing of the underlying mica (0.52 nm) 46 , within experimental error, and with previous studies of the protic IL-mica interface. It is produced by propylammonium cations electrostatically bound to the oxygen triads 47 associated with negatively charged mica surface sites. 33,36,37 are apparent for each system.…”

Section: Resultsmentioning

confidence: 99%

Near surface properties of mixtures of propylammonium nitrate with n-alkanols 1. Nanostructure

Elbourne

Cronshaw

Voïtchovsky

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. * Corresponding author AbstractIn situ amplitude modulated -atomic force microscopy (AM-AFM) has been used to probe the nanostructure of mixtures of propylammonium nitrate (PAN) with n-alkanols near a mica surface. PAN is a protic ionic liquid (IL) which has a bicontinuous sponge-like nanostructure of polar and apolar domains in the bulk, which becomes flatter near a solid surface. Mixtures of PAN with 1-butanol, 1-octanol, and 1-dodecanol at 10 -70 vol% n-alkanol have been examined, along with each pure n-alkanol, to reveal the effect of composition and n-alkanol chain length. At low concentrations the butanol simply swells the PAN nearsurface nanostructure, but at higher concentrations the nanostructure fragments. Octanol and dodecanol first lower the preferred curvature of the PAN near-surface nanostructure because, unlike n-butanol, their alkyl chains are too long to be accommodated alongside the PAN cations. At higher concentrations, octanol and dodecanol self-assemble into n-alkanol rich aggregates in a PAN rich matrix. The concentration at which aggregation first becomes apparent decreases with n-alkanol chain length.2

show abstract

“…This imaging mechanism is illustrated by the similarity of the line profiles (figure 4) with those obtained under low temperature UHV conditions despite the presence of fluid at the interface [53]. The use of larger oscillation amplitudes ( results in not only a reduction in the local force gradient sensitivity [14,28], but also a convolution of the solvation forces with the local tip-sample force leading to a loss of atomic resolution [17,60]. The need for high SNR operation is exemplified by the small amplitudes required in order to obtain true atomic resolution.…”

Section: Hopg Imagingmentioning

confidence: 79%

“…For this hydrophilic surface, water molecules (molecular diameter ~ 2.5 Å [61,62]) are expected to be present at the interface. Previously, imaging with comparable amplitudes allowed for the visualization of dehydrated ions at the mica surface in aqueous solutions whereby the small oscillation amplitude excludes water from the tip-sample gap as described above [17]. Under similar conditions in viscous, ionic liquids, it may be possible to directly measure the charge distribution at the solid-liquid interface [10].…”

Section: Mica Imagingmentioning

confidence: 99%

High viscosity environments: an unexpected route to obtain true atomic resolution with atomic force microscopy

et al. 2014

View full text Add to dashboard Cite

Atomic force microscopy (AFM) is widely used in liquid environments, where true atomic resolution at the solid-liquid interface can now be routinely achieved. It is generally expected that AFM operation in more viscous environments results in an increased noise contribution from the thermal motion of the cantilever, thereby reducing the signal-to-noise ratio (SNR). Thus, viscous fluids such as ionic and organic liquids have been generally avoided for highresolution AFM studies despite their relevance to, e.g. energy applications. Here, we investigate the thermal noise limitations of dynamic AFM operation in both low and high viscosity environments theoretically, deriving expressions for the amplitude, phase and frequency noise resulting from the thermal motion of the cantilever, thereby defining the performance limits of amplitude modulation (AM), phase modulation (PM) and frequency modulation (FM) AFM. We show that the assumption of a reduced SNR in viscous environments is not inherent to the technique and demonstrate that SNR values comparable to ultra-high vacuum systems can be obtained in high viscosity environments under certain conditions. Finally, we have obtained true atomic resolution images of highly ordered pyrolytic graphite and mica surfaces, thus revealing the potential of high-resolution imaging in high viscosity environments.High viscosity environments: an unexpected route to obtain true atomic resolution with atomic force microscopy 2

show abstract

Visualization of Ion Distribution at the Mica−Electrolyte Interface

Cited by 92 publications

References 14 publications

Water-induced correlation between single ions imaged at the solid–liquid interface

Water-induced correlation between single ions imaged at the solid–liquid interface

Near surface properties of mixtures of propylammonium nitrate with n-alkanols 1. Nanostructure

High viscosity environments: an unexpected route to obtain true atomic resolution with atomic force microscopy

Contact Info

Product

Resources

About