Three-Component Langmuir-Blodgett Films with a Controllable Degree of Polarity

Berg, Johan M.; Eriksson, L.G.Tomas; Claesson, Per M.; Børve, K. G. Nordli

doi:10.1021/la00016a041

Cited by 136 publications

(103 citation statements)

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“…The common trend shows that the wettability of the surfaces apparently determines the accumulation kinetics of zoospore and diatoms, even though the terminating chemistries are entirely different. The general trend confirms the Berg limit which predicts inertness for contact angles below 65° [79,80]. Furthermore, the curve shows a minimum for the settlement of Ulva and Navicula on different SAMs at a contact angle of &35°.…”

Section: Surface Cues Can Trigger Permanent Adhesion Of Zoospores Of supporting

confidence: 81%

Surface Sensing and Settlement Strategies of Marine Biofouling Organisms

Rosenhahn

Sendra

2012

Biointerphases

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This review article summarizes some recent insights into the strategies used by marine organisms to select surfaces for colonization. While larger organisms rely on their sensory machinery to select surfaces, smaller microorganisms developed less complex but still effective ways to probe interfaces. Two examples, zoospores of algae and barnacle larvae, are discussed and both appear to have build-in test mechanisms to distinguish surfaces with different physicochemical properties. Some systematic studies on the influence of surface cues on exploration, settlement and adhesion are summarized. The intriguing notion that surface colonization resembles a parallelized surface sensing event is discussed towards its complementarity with conventional surface analytical tools. The strategy to populate only selected surfaces seems advantageous as waves, currents and storms constantly challenge adherent soft and hard fouling organism.

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Section: Surface Cues Can Trigger Permanent Adhesion Of Zoospores Of supporting

confidence: 81%

Surface Sensing and Settlement Strategies of Marine Biofouling Organisms

Rosenhahn

Sendra

2012

Biointerphases

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“…Comparable results were recently obtained in simulations, where the adhesion behavior was shown to depend crucially on the surface adhesion energy (19). A transition between dry adhesion and hydration repulsion was seen for typical surface contact angle values in the range of θ adh = 65°-85°, depending on the mechanical stiffness and the hydrogen-bonding capability of the surfaces (19), the values of θ adh being quite similar to those in experiments (15)(16)(17)(18).…”

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confidence: 78%

“…In contrast, experiments probing the interactions between similar neutral surfaces with well-defined contact angles demonstrated that even hydrophilic surfaces exhibit short-range attractions not accountable by vdW forces down to typical adhesive contact angles of θ adh = 65°-80° (15)(16)(17)(18). Comparable results were recently obtained in simulations, where the adhesion behavior was shown to depend crucially on the surface adhesion energy (19).…”

mentioning

confidence: 69%

From hydration repulsion to dry adhesion between asymmetric hydrophilic and hydrophobic surfaces

Kanduč

Netz

2015

Proc. Natl. Acad. Sci. U.S.A.

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Using all-atom molecular dynamics (MD) simulations at constant water chemical potential in combination with basic theoretical arguments, we study hydration-induced interactions between two overall chargeneutral yet polar planar surfaces with different wetting properties. Whether the water film between the two surfaces becomes unstable below a threshold separation and cavitation gives rise to long-range attraction, depends on the sum of the two individual surface contact angles. Consequently, cavitation-induced attraction also occurs for a mildly hydrophilic surface interacting with a very hydrophobic surface. If both surfaces are very hydrophilic, hydration repulsion dominates at small separations and direct attractive force contribution can-if strong enough-give rise to wet adhesion in this case. In between the regimes of cavitation-induced attraction and hydration repulsion we find a narrow range of contact angle combinations where the surfaces adhere at contact in the absence of cavitation. This dry adhesion regime is driven by direct surface-surface interactions. We derive simple laws for the cavitation transition as well as for the transition between hydration repulsion and dry adhesion, which favorably compare with simulation results in a generic adhesion state diagram as a function of the two surface contact angles.A ccording to the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, the interaction between hydrated surfaces is given by the sum of van der Waals (vdW) and screened electrostatic interactions (1). Although this approach works well in many situations, subnanometer resolved force measurements between individual surfaces demonstrated that additional watermediated interactions are dominant at small separations and depend crucially on the polarity or wetting properties of the surfaces (2-4). Understanding these solvation-induced interactions is still a central issue in all fields concerned with forces between surfaces, colloids, and macromolecular aggregates in water.As is well known, the water film between two hydrophobic surfaces, characterized by water contact angles θ > 90°, becomes freeenergetically unstable below a critical distance and in equilibrium cavitation leads to vapor bubble-induced long-ranged attraction (5-7). Conversely, polar and overall neutral surfaces, characterized by small or vanishing contact angles, exhibit pronounced shortranged repulsive forces, which decay exponentially with a characteristic length in the subnanometer range (8-11). These so-called hydration forces arise from the complex interplay of surface group configurational degrees of freedom, desorption of hydration water from polar surface groups, and ordering of the intersurface water film (4). The understanding of hydration forces has recently been advanced by computer simulations that include explicit water molecules (12)(13)(14).In the absence of direct surface-surface interactions, the transition between cavitation-induced attraction and hydration repulsion should coincide with the contact angle char...

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“…Arachidic acid (AA) was purchased from Merck and used as received. Eicosylamine (EA) was previously prepared according to Berg et al [14]. Chloroform was obtained from Merck and further purified by distillation in all glass apparatus.…”

Section: Experimental Materialsmentioning

confidence: 99%