Deposition of yttrium ions in Langmuir-Blodgett films using arachidic acid

Abstract

The deposition of multilayers of yttrium arachidate by the Langmuir-Blodgett technique on a ailicon/ copper-coated g b substrate was investigated. The films were characterized by X-ray diffraction and photoelectron spectroscopy. The c parameter was determined to be 53.92 f 0.05 A. The compositions of the films as determined by photoelectron spectroscopic techniques showed them to be of good quality. The electron attenuation length in these films has been determined. The characteristic 'odd-even" oscillations of the 001 X-ray diffraction peaks have been discussed interma of a new model for the coordination of the carboxylate groups around the metal ions.

Langmuir−Blodgett Films Based on Known Layered Solids: Lanthanide(III) Octadecylphosphonate LB Films

“…The p K a of a metal ion is a general guide to its oxophilicity, and here p K a reflects the metal ion's affinity for the compressed phosphonate monolayer, where a lower p K a value indicates a stronger affinity. This finding is similar to results of metal ion interaction with fatty acid monolayers where the affinity followed the trend divalent transition metals < Ln III , with the order of the transition metals following inversely their degree of hydration. − …”

“…As the pH is increased, the transition between the LE and LC phases becomes less pronounced, the slope of the compression curve becomes less steep, and film collapse occurs at a lower pressure. These observations indicate that the metal ions are beginning to associate with the phosphonate head groups. − As the pH is increased further, the mean molecular area where the surface pressure begins to rise increases, the slope of the compression curve becomes even more shallow, and the collapse pressure continues to decrease, characteristic of the formation of rigid islands at the air−water interface caused by cross-linking of the organophosphonate molecules by the tightly bound metal ions . An increase in the film rigidity results in an apparent area at collapse of less than 20 Å 2 /molecule.…”

Surface Derivatization of Colloidal Silver Particles Using Interdigitated Bilayers: A Novel Strategy for Electrostatic Immobilization of Colloidal Particles in Thermally Evaporated Fatty Acid/Fatty Amine Films

“…The O 1s spectrum (Figure d) could satisfactorily be accounted for by a single component at 532 eV. This BE is in excellent agreement with the O 1s BE determined from yttrium arachidate Langmuir−Blodgett films and is therefore assigned to the oxygen in the carboxylic acid groups of lauric acid molecules. The expected intensity of the carboxylate carbon accounting for differences in ionization cross sections of the C 1s and O 1s electrons as well as the 2:1 oxygen:carboxylate carbon ratio is ∼50 counts/s.…”

Role of Tail−Tail Interactions versus Head-Group/Subphase Interactions in the Pressure−Area Isotherms of Fatty Amines at the Air−Water Interface. 1. Influence of Subphase Acid Counterions

“…Studies on biologically important molecules include linear alkyl chain phosphatidylcholines or ethanolamines. Condensed Langmuir monolayers of primary amines have been used for depositing large complex ammonium salts of organic or inorganic anions at low bulk pH from an aqueous subphase, which include the titanyl oxalate anion, [TiO(C 2 O 4 ) 2 ] 2- , or the chloroplatinate anion, [PtCl 6 ] 2- . The films of salts of fatty amines are useful, after suitable treatment, for forming ultrathin films of oxides such as TiO 2 or for forming nanoclusters of Pt metal or other sulfides, for example.…”