Structural Characterization of an Octadecylamine Langmuir–Blodgett Film Adsorbed with Methyl Orange

Synthesis and characterization of a novel polyurethane elastomer based on CO2 copolymer

“…This suggests that the main contribution to the large blue shifting in SAMU films (λ max = 430 nm) as compared with that in aqueous solution (λ max = 462 nm) is due to the H‐type of interaction between MO molecules via electrostatic interaction between anionic MO dye and cationic PDAC repeat units. In addition, the wavelength band at 430 nm may be ascribed to monomeric MO because the λ max of MO in solution is located relatively close to this solution wavelength and also supported by previously reported results as elaborated below 6–14…”

“…Similarly, interactions between the chromophores are found to be responsible for the blue shift of azo‐dendrimers and in cast films of azobenzene‐containing amphiphiles 13. In another related study, Langmuir–Blodgett films formed from the pair of MO and cationic surfactant and dye molecules oriented in a more or less parallel fashion to exhibit a blue shift band 14…”

Adsorption Behavior of Methylene Blue and Its Congeners on a Stainless Steel Surface

“…According to the results of these studies, the IR absorption band due to the stretching vibration of the benzene ring around 1600 cm −1 was found to be significant when it orients perpendicular to the adsorption surface (25,26,34). Also in this study, the band related to the stretching vibration of the heterocycle ring was strongly detected around 1600 cm −1 .…”

“…Until now, the RA-IR technique has not been applied to the analysis of the orientation of the molecules including polyheterocycle on the metal surface as far as we know, whereas the orientations of the adsorbed molecules with benzene ring, of which the vibration mode and wavenumber of the band are similar to those of the heterocycle, have been investigated by the RA-IR technique (25,26,34). According to the results of these studies, the IR absorption band due to the stretching vibration of the benzene ring around 1600 cm −1 was found to be significant when it orients perpendicular to the adsorption surface (25,26,34).…”

Study of assembly of arachidic acid/LDHs hybrid films containing photoactive dyes

“…The red-shift of the two bands may be due to some disorder of hydrocarbon chains of AA induced by the intercalation of MO or CR molecules into the gallery of LDHs in the AA/LDHs hybrid film. Work on other cationic LB films [41,[47][48][49], has also shown that the adsorption of MO or NO (α-naphthol orange) molecules caused the disorder of the hydrocarbon chains of octadecylamine chloride or stearyldimethylammonium in the films.…”