Three-phase contact line motion in the deposition of spread monolayers

Deposition of Langmuir-Blodgett layers

“…This is our basic result. For 0~ = 0.2, )7= 50 dynes/cm, //--10 -2 poises, U,~ -0.1 cm/sec -very much in the range covered by the observations [3]. The angle 0e is related to the interfacial energies YB (for a dry bilayer) and YM (for a wet monolayer) through:…”

“…The details of the deposition process are only partially understood [2]. Some of the best quantitative data have been recorded by Petrov et al [3] using fluorescence quenching to monitor the contact between flesh film and solid substrate. Most of these data are taken in the "ascending Y mode" where the polar heads from the fresh film stick to the polar heads of the preceding layer.…”

Structural Characterization of an Octadecylamine Langmuir–Blodgett Film Adsorbed with Methyl Orange

“…have reported the conditions for irreversible transfer of of long-chain alkylammonium salts. Subsequently, structural octadecylamine monolayer on a solid substrate from the sur-characterizations of the ODA LB film with and without face of aqueous solutions containing salts of polyvalent acids methyl orange (MO) adsorption were carried out by spectro- (11). Bardosova et al have studied the property of the scopic methods, and further, the change in the layer structure induced by MO adsorption was investigated by applying X- 1 To whom correspondence should be addressed.…”

Mechanism of Regular Pattern Formation in Reactive Dewetting

“…However, beyond a critical withdrawal speed, which depends on the monolayer transfer kinetics, a water film of continuously growing length is entrained on the substrate. [12] At velocities slightly below this critical velocity, observable differences between the apparent receding contact angle and the meniscus height appear. [13] These discrepancies were explained in terms of a local film entrainment that deforms the monolayer-covered air-water interface in the vicinity of the contact line (illustrated in Figure 2 a).…”

“…[10] In the situation where the liquid changes the wettability of the solid-vapour interface (reactive wetting), stick-slip phenomena can lead to an oscillation in the meniscus shape [11] . In the case of "reactive" LB transfer of surfactant molecules from the airwater interface onto a solid substrate, the contact line can recede along hydrophilic surfaces at unusually high velocities, on the order of cm s À1 [12] . This is possible because a condensed layer of surfactant molecules transfers to the substrate, thus lowering the energy of the solid-air interface.…”