Overlayer-induced ordering of the disordered surface monolayer in Langmuir-Blodgett multilayer thin films

Skita, V.; Richardson, W.; Filipkowski, Mark; Garito, A. F.; Blasie, J. Kent

doi:10.1051/jphys:0198600470100184900

Cited by 42 publications

(29 citation statements)

References 8 publications

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“…X-ray diffraction can be used to observe such changes. 20 Indeed, very recent data on a lipid monolayer is in excellent agreement with our calculated tilt angle. 21 No quantitative data presently exist on conformational defects in Langmuir films.…”

supporting

confidence: 88%

Characterization of Structural and Dynamical Behavior in Monolayers of Long-Chain Molecules Using Molecular-Dynamics Calculations

1988

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Molecular-dynamics calculations have been carried out for a system of long-chain molecules supported on a physisorbing planar substrate and constrained to a surface density characteristic of that observed in lipid and fatty acid monolayers at the air-water interface. Results are presented for the density distribution normal to the surface, the structure factor parallel to the surface, and the number of chain conformational defects as the surface area per chain is increased at room temperature. The driving force for the observed structural and conformational changes appears to be related to the tendency for the alkyl-chain methylene groups to close-pack.

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supporting

confidence: 88%

Characterization of Structural and Dynamical Behavior in Monolayers of Long-Chain Molecules Using Molecular-Dynamics Calculations

1988

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“…1. The thickness per monolayer of pure AA multilayer was 2.78 l 0.05 nm, which is in good agreement with the value obtained for cadmium arachidate multilayer by Skita et al (5.4 nm for the double layer) 24) . This was invariable for any indices of Bragg diffraction.…”

Section: X-ray Diffractometrysupporting

confidence: 91%

Conformations of poly(dihexylsilane) embedded in Langmuir-Blodgett multilayers of arachidic acid

Seki¹,

Tohnai²,

Tanigaki

et al. 1999

Macromol. Chem. Phys.

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Poly(dihexylsilane) (PDHS) and arachidic acid (AA) were co-spread onto a cadmium-containing water subphase and transferred onto a solid substrate as multilayers by the Langmuir-Blodgett method. The structure of these films was evaluated by means of UV-visible absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry, and film thickness measurements. The results indicated that the PDHS ultrathin film is incorporated into a well-structured AA multilayer matrix without appreciable destruction of the layer structure. The conformational behavior of PDHS embedded within this film was evaluated by UV-visible absorption spectroscopy. The phase transition temperature of the ordered (alltrans zigzag) to the disordered (helical gauche) state on the AA monolayer at the air-water interface is lowered and the conformational state is virtually maintained in the as-deposited multilayers during storage at room temperature at least for a month. PDHS in the AA multilayer on heating showed a substantially broadened transition around 40 8C, which clearly reflects a geometrical restriction effected by the AA multilayer matrix.

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“…rectangle, its final methyl group is not centered in the It has also been claimed that the outermost rectangle formed by the final methyl groups of the comer molecules. layer is always disordered relative to internal layers (10). In addition, electron diffraction (2,-4) and Fourier transform infrared (FTIR) spectroscopy (16) have shown that a monolayer film has a d8erent structure than multilayer films.…”

mentioning

confidence: 99%

Surface Order and Stability of Langmuir-Blodgett Films

Schwartz

Garnæs

Viswanathan

et al. 1992

Science

210

185

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Angstrom-resolution atomic force microscope images of Langmuir-Blodgett monolayers and multilayers of cadmium arachidate in air and under water show a dramatic change from a disordered arrangement to a crystalline lattice by the addition or removal of a single layer of molecules. The disordered surface is less stable than the ordered one to mechanical stresses such as atomic force microscopy tip forces or at the air-water contact line during contact angle measurements. The difference in the degree of order in the alkyl chains is attributed to the strong attractive interaction between headgroups in the presence of the divalent cation.

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Overlayer-induced ordering of the disordered surface monolayer in Langmuir-Blodgett multilayer thin films

Cited by 42 publications

References 8 publications

Characterization of Structural and Dynamical Behavior in Monolayers of Long-Chain Molecules Using Molecular-Dynamics Calculations

Characterization of Structural and Dynamical Behavior in Monolayers of Long-Chain Molecules Using Molecular-Dynamics Calculations

Conformations of poly(dihexylsilane) embedded in Langmuir-Blodgett multilayers of arachidic acid

Surface Order and Stability of Langmuir-Blodgett Films

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