TITLE

Investigation into the Structure of Langmuir–Blodgett Films Prepared from Salts of Acetylenic Acids

AUTHOR(S)
Sveshnikova, L. L.; Badmaeva, I. A.; Dembo, K. A.; Yanusova, L. G.
PUB. DATE
September 2005
SOURCE
Crystallography Reports;Sep2005, Vol. 50 Issue 5, p854
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Langmuir–Blodgett films are prepared from lead, cadmium, and copper salts of carboxylic acids, namely, 23-tetracosynoic acid HC≡C(CH2)21COOH (with the terminal triple bond) and 2-docosynoic acid CH3(CH2)18C≡CCOOH (with the internal triple bond). The structural transformations in the films during polymerization under exposure to UV radiation are investigated using X-ray reflectomertry. It is found that the X-ray reflectograms of the initial films prepared from salts of both acids exhibit no less than four or five pronounced intense Bragg reflections. This suggests that the initial films have good layer ordering. The bilayer periods for all the films are determined, and the influence of the salt type on the bilayer period is analyzed. It is established that, under exposure to UV radiation, the structural transformations in the films prepared from the salts of 23-tetracosynoic acid occur without substantial disturbances and defects, as can be judged from the absence of significant changes in the location and intensity of the Bragg reflections. An increase in the time of irradiation of the films prepared from the salts of 2-docosynoic acid leads to an increase in the bilayer period. This effect is especially pronounced for the lead and copper salts. However, upon long-term exposure to UV radiation, the salts undergo photolysis, the bilayer period decreases, and the structure of the film begins to break down. © 2005 Pleiades Publishing, Inc.
ACCESSION #
18415686

 

Related Articles

  • Metal (Cu; Pd) adsorption on MgO: investigations with MIES and UPS. Krischok, S.; Stracke, P.; Kempter, V. // Applied Physics A: Materials Science & Processing;Jan2006, Vol. 82 Issue 1, p167 

    MgO films (2-nm thick) were grown on W(110) while metastable impact electron (MIES) and photoelectron (UPS(HeI)) spectra were collected in situ; apart from the valence-band emission no additional spectral features could be detected. The oxide surface was exposed to metal atoms (Cu; Pd)...

  • Examination of membrane fusion by dissipative particle dynamics simulation and comparison with continuum elastic models. Da-Wei Li; Xiang Yang Liu // Journal of Chemical Physics;5/1/2005, Vol. 122 Issue 17, p174909 

    A dissipative particle dynamics model is applied to probe the lipidic membrane fusion. This model is verified by reproducing the lipid phase behavior. The classical stalk model has been visited and modified. The tilt deformation of the lipids and the noncircular shape of the stalk are supported....

  • Comparative study of normal and branched alkane monolayer films adsorbed on a solid surface. I. Structure. Enevoldsen, A. D.; Hansen, F. Y.; Diama, A.; Criswell, L.; Taub, H. // Journal of Chemical Physics;3/14/2007, Vol. 126 Issue 10, p104703 

    The structure of a monolayer film of the branched alkane squalane (C30H62) adsorbed on graphite has been studied by neutron diffraction and molecular dynamics (MD) simulations and compared with a similar study of the n-alkane tetracosane (n-C24H52). Both molecules have 24 carbon atoms along...

  • Irreversible adsorption of particles at random-site surfaces. Adamczyk, Zbigniew; Jaszczólt, Katarzyna; Siwek, Barbara; Weroński, Pawel // Journal of Chemical Physics;6/15/2004, Vol. 120 Issue 23, p11155 

    Irreversible adsorption of negatively charged polystyrene latex particles (averaged diameter 0.9 μm) at heterogeneous surfaces was studied experimentally. The substrate bearing a controlled number of adsorption sites was produced by precovering mica sheets by positively charged polystyrene...

  • Measurement of stiffness and damping constant of self-assembled monolayers. Devaprakasam, D.; Biswas, S. K. // Review of Scientific Instruments;Mar2005, Vol. 76 Issue 3, p035102 

    We design and fabricate an apparatus which uses two dual double cantilever flexures to probe mechanical properties of self-assembled monolayers (SAM) under compression. The cantilevers were designed to give stiffness of the same order as the SAM. One of the cantilevers carrying the probe is...

  • Molecular simulation studies of nanoscale friction between phosphorylcholine self-assembled monolayer surfaces: Correlation between surface hydration and friction. Yi He; Shengfu Chen; Hower, Jason C.; Bernards, Matthew T.; Shaoyi Jiang // Journal of Chemical Physics;8/28/2007, Vol. 127 Issue 8, p084708 

    We performed all-atom molecular dynamics simulations to study the friction between surfaces covered with two phosphorylcholine self-assembled monolayers (PC-SAM) under shear. PC-SAM surfaces with a [Square_Root]7×[Square_Root]7R19° lattice structure and a parallel arrangement of the head...

  • Corrugation energy for octane on Cu(111). Bruch, L. W. // Journal of Chemical Physics;12/8/2004, Vol. 121 Issue 22, p11388 

    The energy barrier for sliding of octane on Cu(111) is estimated from an experimental datum for the Brillouin-zone-center gap for translation of a monolayer solid of the octane. © 2004 American Institute of Physics.

  • Atomic dynamics of explosive boiling of liquid-argon films. Gu, X.; Urbassek, H. M. // Applied Physics B: Lasers & Optics;Sep2005, Vol. 81 Issue 5, p675 

    Using molecular-dynamics simulation, we study the explosive boiling of thin liquid-argon films adsorbed on a metal surface. This process might be induced by heating the metal substrate by an ultra-fast laser. Upon sudden heating of the metal to temperatures well beyond the critical temperature...

  • AGGREGATION OF P-TERPHENYL ALONG WITH PMMA/SA AT THE LANGMUIR AND LANGMUIR–BLODGETT FILMS. Hussain, Syed Arshad; Islam, MD. N.; Leeman, Hugo; Bhattacharjee, Debajyoti // Surface Review & Letters;Aug2008, Vol. 15 Issue 4, p459 

    Molecular aggregation and monolayer characteristics of non-amphiphilic p-terphenyl (TP) mixed with either polymethyl methacrylate (PMMA) or stearic acid (SA) at the air–water interface were investigated. The miscibility of the two components was evaluated by measuring and analyzing...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics