Elasticity of Langmuir monolayer detected by dynamic oscillation method
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Stearic acid
Elasticity
Classification of discontinuities
Direct measurement by the radiotracer method has been carried out in order to determine the surface excess of calcium on the stearic acid monolayer. It did not provoke any disturbance in the monolayer, such as “skimming off” or “building up”. At higher pH values the stearic acid monolayer spread on a calcium chloride solution shows a very remarkable inhomogeneity. It has been pointed out that this inhomogeneity must be taken into consideration in determining the composition of the monolayer. The mixed monolayer of stearic acid and calcium stearate satisfies the equation derived by assuming this monolayer to be a mixture not athermal.
Stearic acid
Calcium stearate
Stearate
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Abstract In situ FT-IR external reflection spectra of spread monolayers (Langmuir films) of stearic acid and Cd stearate on the water surface were recorded at various surface areas. In the stearic acid monolayer, the trans-gauche conformational change upon monolayer compression was observed, while only the all-trans conformer was observed in the Cd stearate monolayer. Even in largely expanded monolayers of Cd stearate, present is the rigid crsytalline island instead of the rather flexible island in the acid monolayer.
Stearic acid
Stearate
Reflection
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Brewster's angle
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A family of linear copolysiloxanes [1-3] substituted with side chains containing carboxylic head groups has been synthesised. The Langmuir properties of the mixed monolayer at the water-air interface has been studied using a single layer Langmuir trough. The area per molecule for the mixed monolayer is calculated theoretically and experimentally. This study has not only shown that there is an excellent agreement between theoretical and experimental values, but has also shown that this mixed monolayer at the water-air interface can be transferred as a monolayer onto a solid substrate.
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Abstract It has been shown experimentally that molecules, which exhibit liquid crystal phases in bulk, also show interesting phenomena when they are formed in monolayers at air-water interface. The purpose of this work is to clarify to what extent can a simple model explain the complicated behavior of such Langmuir monolayers. Molecular dynamic simulation is conducted to observe the phase and dynamics of Langmuir monolayers
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Stearic acid
Surface pressure
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Myristic acid
Stearic acid
Surface pressure
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The electrostatic binding and metal coordination between metal ions and Langmuir monolayers or LB films are discussed, and their effects on the monolayer 2D structure and related phase behavior are analyzed. The interfacial recognition and sensing for metal ions by Langmuir monolayers are also shown. Langmuir monolayers and LB films as 2D template to induce the 2D-oriented crystal growth via metal/monolayer binding is especially demonstrated. The abnormal catalytic characteristics, the functions and devices of metal-incorporated Langmuir monolayers and LB films are displayed by some examples. The review also shows the application of metal-chelating lipid monolayers on the interfacial study of bio-macromolecules. The review suggests the great roles of metal/monolayer binding in alternating monolayer structures and the assembly of functional metal complexes.
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In the preceding two works (1, 2) the present author studied on the interaction between various kinds of monolayers and alkaloids by the surface pressure and surface potential measurements and made some discussions on the mode of interaction between them. On the interaction between monolayer and dye, Matsuura (3) and Muramatsu (4) studied by means of the measurement of the pressure-area relation of stearic acid and octadecylamine monolayer on the dye solution.Both of the alkaloids and the dyes have generally a large molecular weight and basic nitrogen atoms (in basic and amphoteric dyes) but they are extremely different with each other in their molecular structures.So, it was intended in this work to investigate the interaction between stearic acid monolayer and dissolved dye by the surface pressure and surface potential measurements, to clarify further the mode of interaction between them and then to compare this result with those obtained in the case of alkaloids from the point of view of their molecular structures.
Stearic acid
Surface pressure
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