A reevaluation of temperature-dependent bilayer interaction forces as determined by surface forces and atomic force microscopy measurements

Tsao, Yi-Hua; Yang, S. X.; Evans, D. F.

doi:10.1021/la00040a028

Cited by 9 publications

(9 citation statements)

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“…A plausible origin for the unraveled cold-induced charge neutralization is therefore increased adsorption of K + counterions to the surface. This conjecture is consistent with findings describing increased binding of substrates to enzymes ,, and stronger counterion binding to charged bilayers at low temperatures.…”

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confidence: 52%

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Common Source of Cryoprotection and Osmoprotection by Osmolytes

2019

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While recent studies clarify the effect of osmolytes on Coulomb interaction at elevated concentrations of salt, little is known about the way osmolytes affect the same interaction in cryoprotection. In this Communication we explore the effect of cold on the interaction between two charged surfaces immersed in ternary solution containing salt and osmolyte and find that the effect of cold parallels that of excess salt, i.e., low temperatures increase adsorption of salt counterions to the surface, thus neutralizing it. Two osmolytes, proline and glycine-betaine, are then shown to recharge the surface by releasing the adsorbed counterions. The ability to counteract effects of both cold and excess salt on Coulomb interactions renders these known osmolytes cryoprotectants as well as osmoprotectants, explaining why plants, fish, insects and bacteria accumulate them in response to either drought or cold stress.

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confidence: 52%

“…Pro and GB are shown to oppose this effect of cold, restoring electrostatic repulsion by desorbing salt cations from the charged surfaces. Previous studies describing increased ion adsorption to biosurfaces at lower temperatures support this hypothesized molecular mechanism. − …”

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confidence: 74%

Common Source of Cryoprotection and Osmoprotection by Osmolytes

2019

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“…Recently, it was shown that very few of the reported results are directly related to the intrinsic hydrophobicity of the surfaces in question 1. Many seemingly contradictory or inconclusive results from studies concerning the effects of electrolyte concentration,4-12 temperature,13-15 and dissolved gases7,8,10,16,17 can be attributed to surface or solution preparation techniques. To determine how various parameters affect hydrophobic interactions quantitatively, fundamental studies concerning temperature and electrolyte effects must be carried out on smooth, stable hydrophobic surfaces, such as octadecyl-tri-ethoxysilane (OTE) monolayers chemisorbed on activated mica.…”

Section: Introductionmentioning

confidence: 99%

The search for the hydrophobic force law

et al. 2010

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After nearly 30 years of research on the hydrophobic interaction, the search for the hydrophobic force law is still continuing. Indeed, there are more questions than answers, and the experimental data are often quite different for nominally similar conditions, as well as, apparently, for nano-, micro-, and macroscopic surfaces. This has led to the conclusion that the experimentally observed force–distance relationships are either a combination of different ‘fundamental’ interactions, or that the hydrophobic force-law, if there is one, is complex – depending on numerous parameters. The only unexpectedly strong attractive force measured in all experiments so far has a range of D ≈ 100–200 Å, increasing roughly exponentially down to ~ 10–20 Å and then more steeply down to adhesive contact at D = 0 or, for power-law potentials, effectively at D ≈ 2 Å. The measured forces in this regime (100–200 Å) and especially the adhesive forces are much stronger, and have a different distance-dependence from the continuum VDW force (Lifshitz theory) for non-conducting dielectric media. We suggest a three-regime force-law for the forces observed between hydrophobic surfaces: In the first, from 100–200 Å to thousands of ångstroms, the dominating force is created by complementary electrostatic domains or patches on the apposing surfaces and/or bridging vapour cavities; a ‘pure’ but still not well-understood ‘long-range hydrophobic force’ dominates the second regime from ~ 150 to ~ 15 Å, possibly due to an enhanced Hamaker constant associated with the ‘proton-hopping’ polarizability of water; while below ~ 10–15 Å to contact there is another ‘pure short-range hydrophobic force’ related to water structuring effects associated with surface-induced changes in the orientation and/or density of water molecules and H-bonds at the water–hydrophobic interface. We present recent SFA and other experimental results, as well as a simplified model for water based on a spherically-symmetric potential that is able to capture some basic features of hydrophobic association. Such a model may be useful for theoretical studies of the HI over the broad range of scales observed in SFA experiments.

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“…The adsorption behavior of single and double long-chain alkylammonium ions from aqueous solution has been studied at a variety of solid surfaces, including graphite, , silica, − and mica. − The behavior is complicated by the presence of solution aggregate forms, dimers, n -mers, and micelles, near and above the critical micelle concentration (cmc). Several recent studies have focused on the adsorption behavior of these species.…”

Section: Introductionmentioning

confidence: 99%

Two-Stage Growth of Octadecyltrimethylammonium Bromide Monolayers at Mica from Aqueous Solution below the Krafft Point

Hayes

Schwartz

1998

Langmuir

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The time-dependent growth of octadecyltrimethylammonium bromide (C18TAB) monolayers at mica surfaces from aqueous solution, at a temperature below the Krafft point, is investigated with transmission IR spectroscopy, wetting measurements, and atomic force microscopy (AFM). Under these deposition conditions, C18TAB adsorbs predominately as the monomer rather than as an aggregated solution species resulting in monolayer films. Formation of the C18TAB monolayer is characterized by two distinct growth regimes. A rapid initial adsorption is observed which results in a 2-D liquid phase comprised of randomly oriented alkyl chains. When the films are allowed to assemble for times longer than 24 h, distinct, densely packed, monolayer high islands of C18TA+ molecules are observed (2-D solid). As the assembly time is increased further, the relative surface coverage of the semicrystalline islands increases substantially. In this growth regime, the mica surface is covered by a two-phase film comprised of the 2-D liquid and solid phases. Comparison of these results to those previously obtained for the adsorption of octadecylphosphonic acid (OPA) on mica clearly shows a distinctly different growth mechanism for the two systems.

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A reevaluation of temperature-dependent bilayer interaction forces as determined by surface forces and atomic force microscopy measurements

Cited by 9 publications

References 0 publications

Common Source of Cryoprotection and Osmoprotection by Osmolytes

Common Source of Cryoprotection and Osmoprotection by Osmolytes

The search for the hydrophobic force law

Two-Stage Growth of Octadecyltrimethylammonium Bromide Monolayers at Mica from Aqueous Solution below the Krafft Point

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