Preparation and structure of lanthanum stearate films

Popescu, M.; Gutberlet, Thomas; Kastowsky, Manfred; Koch, P.-J.; Bradaczek, H.

doi:10.1016/s0040-6090(97)00073-4

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…3. This indicates a well-ordered structure with a repeat distance d k ¼ 52: 4 A A, which is 6-8% larger than the layer spacing d bulk ¼ 49: 3 A A of bulk stearic acid [20], and twice the extended moleculeÕs length, 48.8 A A. All crystalline polymorphs of stearic acid consist of dimers, hydrogen bonded by the carboxylic headgroups of the two molecules [18].…”

Section: Grazing Incidence Diffraction: the Surfaceparallel Structurementioning

confidence: 95%

The structure of organic langmuir films on liquid metal surfaces

Kraack

Deutsch

Ocko

et al. 2003

Nuclear Instruments and Methods in Physics Research Section B:

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Langmuir films (LFs) on water have long been studied for their interest for basic science and their numerous applications in chemistry, physics, materials science and biology. We present here A A-resolution synchrotron X-ray studies of the structure of stearic acid LFs on a liquid mercury surface. At low coverage, P 110 A A 2 /mol, a 2D gas phase of flat-lying molecules is observed. At high coverage, 6 23 A A 2 /mol, two different hexatic phases of standing-up molecules are observed. At intermediate coverage, 52 6 A 6 110 A A 2 /mol, novel single-and double-layered phases of flat-lying molecular dimers are found, exhibiting a 1D in-layer order. Such flat-lying phases were not hitherto observed in any LF. Measurements on LFs of fatty acids of other chain lengths indicate that this structure is generic to chain molecules on mercury, although the existence of some of the flat-lying phases, and the observed phase sequence, depend on the chain length. Organic LFs on Hg, and in particular the new flat-lying phases, should provide a broader nano-structural tunability range for molecular electronic device construction than most solid-supported self-assembled monolayers used at present.

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Section: Grazing Incidence Diffraction: the Surfaceparallel Structurementioning

confidence: 95%

The structure of organic langmuir films on liquid metal surfaces

Kraack

Deutsch

Ocko

et al. 2003

Nuclear Instruments and Methods in Physics Research Section B:

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“…109 Among the first Langmuir-Blodgett films of lanthanide(III) alkanoates were those of lanthanum(III) octadecanoate. 110 Silva and co-workers studied monolayers and Langmuir-Blodgett films formed by spreading arachidic acid on aqueous solutions of europium(III) and terbium(III). 111 By transferring these films to a solid support, luminescent multilayer films could be obtained.…”

Section: A Alkanoatesmentioning

confidence: 99%

“…Derué et al investigated an elaidic acid monolayer prepared on a terbium-containing subphase by scanning force microscopy. Among the first Langmuir-Blodgett films of lanthanide(III) alkanoates were those of lanthanum(III) octadecanoate 110. Silva and co-workers studied monolayers and Langmuir-Blodgett films formed by spreading arachidic acid on aqueous solutions of europium(III) and terbium(III) 111.…”

mentioning

confidence: 99%

Lanthanide-Containing Liquid Crystals and Surfactants

2002

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Christiane Görller-Walrand was born in Brussels, Belgium, in 1943. She is a Professor of Chemistry at the Catholic University of Leuven. She obtained her M.S. (1965) and Ph.D. (1969) in Chemistry at the Catholic University of Leuven. She was chairperson of the First International Conference on f-Elements (ICFE-1, Leuven, 1990). Her research interests include coordination chemistry, the spectroscopy of lanthanides and actinides, and MCD spectroscopy. Koen Binnemans was born in Geel, Belgium, in 1970. He obtained his M.S. (1992) and Ph.D. (1996) in Chemistry at the Catholic University of Leuven, under the supervision of Prof. C. Görller-Walrand. Since 1996, he has been a Postdoctoral Fellow of the Fund for Scientific Research Flanders (Belgium). He did postoctoral work with Prof. J. Lucas (Rennes, F) and Prof. D. W. Bruce (Exeter, UK). In 2000, he received the first ERES Junior Award (ERES: European Rare-Earth and Actinide Society).His current research interests are metal-containing liquid crystals (metallomesogens), MRI contrast reagents, lanthanide-doped sol−gel glasses, and lanthanide spectroscopy. Other interests include reading, collecting minerals, Egyptology, and the history of articifial lighting.

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“…4, inset). This indicates a well-ordered structure with a repeat distance d ϭ 52.4 Å, ϳ6% larger than that of bulk stearic acid (30), d bulk ϭ 49.3 Å. All bulk crystalline polymorphs of stearic acid consist of dimers, hydrogen bonded at their center by the carboxylic head groups of the two molecules (19).…”

mentioning

confidence: 95%

Structure of a Langmuir Film on a Liquid Metal Surface

Kraack

Ocko

Pershan

et al. 2002

Science

157

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The structure of organic monolayers on liquid surfaces depends sensitively on the details of the molecular interactions. The structure of a stearic acid film on a mercury surface was measured as a function of coverage with angstrom resolution. Unlike monolayers on water, the molecules were found here to undergo a transition from surface-parallel to surface-normal orientation with increasing coverage. At high coverage, two condensed hexatic phases of standing-up molecules were found. At low coverage, a two-dimensional (2D) gas phase and condensed single- and double-layered phases of flat-lying molecular dimers were revealed, exhibiting a 1D longitudinal positional order. This system should provide a broader tunability range for nanostructure construction than solid-supported self-assembled monolayers.

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Preparation and structure of lanthanum stearate films

Cited by 6 publications

References 9 publications

The structure of organic langmuir films on liquid metal surfaces

The structure of organic langmuir films on liquid metal surfaces

Lanthanide-Containing Liquid Crystals and Surfactants

Structure of a Langmuir Film on a Liquid Metal Surface

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