Neutron activation analysis of metal ions in Langmuir—Blodgett multilayers of arachidic acid

Petrov, Jordan G.; Kuleff, I.; Platikanov, Dimo

doi:10.1016/0021-9797(82)90152-7

Cited by 77 publications

(38 citation statements)

References 26 publications

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“…It has also been reported that the divalent cations dramatically improve film stability during deposition because they interact with arachidic acid to form a "di-soap", which enhances the film stability. 18,25,26 Liu et al studied the effects of the addition of cations in AA LB films. 18 It is reported that the addition of Cd 2+ or Ba 2+ improves the AA LB film quality.…”

Section: Resultsmentioning

confidence: 99%

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

2008

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We fabricated tetra(5-n-nonyl-8-tert-butyl-2,3-pyrazino[2,3-b]indolo)porphyrazinato copper(II) (Cu-Pc-C 8 ) Langmuir-Blodgett (LB) films. We further investigated the influence of arachidic acid (AA) as a transfer promoter, as well as the effect of dipping speed, on the deposition of the films on hydrophilic and hydrophobic substrates. In the case of pure Cu-Pc-C 8 LB deposition on a hydrophilic substrate, the transfer ratio was close to one for up-stroke depositions, but the previously deposited film was peeled off and re-spread onto water at down-stroke depositions. Whereas the stability of the Cu-Pc-C 8 LB films was not improved by AA addition on hydrophilic substrates, the deposition of Cu-Pc-C 8 was significantly improved by the presence of AA on a hydrophobic substrate. The AAassisted deposition had transfer ratio of close to 1 and was essentially stable up to 10-layer depositions. Comparison of the UV-visible spectrum of a Cu-Pc-C 8 /AA LB film with that of Cu-Pc-C 8 /AA solution in dichloroethane revealed that the Soret and Q bands for the Cu-Pc-C 8 /AA LB film were broadened and red-shifted due to the aggregation of phthalocyanines upon assembly in the LB film.

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Section: Resultsmentioning

confidence: 99%

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

2008

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“…The stability properties of the transferred multilayer system are influenced by the composition of their polar regions. Divalent counter ions in the aqueous substrate have a positive effect on the monolayer deposition, but only few results are available on their bonding ratio in the transferred layer systems [4,5]. Up to now the role of water in transferred multilayer has been discussed as distinguishing between chemically bonded, penetrated and adherent water [6].…”

Section: Introductionmentioning

confidence: 97%

FTIR spectroscopic studies of layer systems transferred onto germanium supports

Vollhardt¹,

Wittig²,

Maulhardt³

et al. 1984

Colloid & Polymer Sci

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An ATR attachment was adapted to a FTIR spectrometer. The increased sensitivity makes it possible to measure spectra of transferred monolayers. The characteristic vibrational frequencies of the transferred multilayer systems of two different substance types (octadecanoic acid, octadecylamine) were investigated in dependence on the layer number. A direct correlation between the absorbance and the transferred substance quantity was found. The absence of interaction between the first layer and the germanium surface was evidenced by the lack of a difference between multilayer spectra divided by the layer number, and the measured spectrum of one layer.

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“…On the other hand, the satisfactory linear dependence of the experimental results in the theoretical 0 a~+ vs. 0/ scale required by Equation (16) (Ig (1 -8) 2 aM2+ / established in References [4] and [6], is not substantiaUy sensible to the presence of the additional factor, because of the almost linear shape of the function Ig 2-8 vs. 8. This factor, however, alters the values of 4 (15) gex found in [4][5][6]16] as well as the slopes of the straight lines which give co and A1, 2 (see further).…”

Section: (2-o)4+mentioning

confidence: 91%

“…Because of the aforesaid, the results of the interaction of the arachidic acid (HAtch) with Cd 2+ and Ba 2+ [16] and of liSt with Ca 2+ [4,13] which correspond to the above requirements (see Fig. 1) will be used for verification of Equation (20).…”

Section: (2-o)4+mentioning

confidence: 99%

Equilibrium constants of ion exchange reactions between fatty acid monolayers and dissolved counterions

Petrov

Platikanov

1987

Colloid & Polymer Sci

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Equations for equilibrium constants of ion exchange between fatty acid monolayers and subsolution counterions are derived. The approach of Matsubara et al. [4], where the monolayer is considered as a two-dimensional regular mixture is employed, but the different molar volumes of its components are taken into account. Using the equations obtained the Kex values are calculated on the basis of published data on the monolayer composition in the systems Cd2+/HArch, Ba2+/HArch, Ca2+/HSt, pb2+/ HSt and Cu 2 +/HSt. The stability constants of the corresponding soaps formed in the monolayer are also obtained.

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Neutron activation analysis of metal ions in Langmuir—Blodgett multilayers of arachidic acid

Cited by 77 publications

References 26 publications

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

FTIR spectroscopic studies of layer systems transferred onto germanium supports

Equilibrium constants of ion exchange reactions between fatty acid monolayers and dissolved counterions

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