Conducting Langmuir-Blodgett films

Barraud, A.; Lesieur, P.; Ruaudel‐Teixier, A.; Vandevyver, M.

doi:10.1016/0040-6090(85)90131-2

Cited by 44 publications

(20 citation statements)

References 5 publications

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“…At the high concentration end the radical yield (0.38) is very close to 1 -PD for water. This indicates that all muons that are not directly incorporated into diamagnetic states can be picked (11) up to give radicals under these conditions. When acrylamide was localized in dilute micelles in the water, the same radical is formed and with about the same yield as in the absence of micelle (see Table I).…”

Section: Mu Lifetime /Nsmentioning

confidence: 99%

Muonium and free-radical yields as determined by the muon level-crossing-resonance technique in aqueous and micelle solutions of acrylamide

Venkateswaran¹,

Barnabas²,

Kiefl³

et al. 1989

J. Phys. Chem.

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Muonated free radicals that form in pure unsaturated organic compounds are also found to occur in dilute aqueous micelle solutions of these compounds, where thermalized muonium atoms are the only possible precursors. For 2 X 10-4 M acrylamide solutions in pure water, the fractional yield of the CH2(Mu)CHCONH2 radicals is observed by LCR to be 0.2 (consistent with the muonium yield by #tSR). The Mu radical yield increases with acrylamide concentration until at ~0.2 M it equals 0.38, which, along with the fraction of muons in a diamagnetic environment, account for the entire muon polarization. Hyperfme coupling constants of the protons in the CH2(Mu)CHCONH2 radical have also been determined.

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Section: Mu Lifetime /Nsmentioning

confidence: 99%

Muonium and free-radical yields as determined by the muon level-crossing-resonance technique in aqueous and micelle solutions of acrylamide

Venkateswaran¹,

Barnabas²,

Kiefl³

et al. 1989

J. Phys. Chem.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] These organic CT complexes are classified into two types according to their different stacking styles of donor and acceptor molecules, i.e. the so-called segregated-stack and mixed-stack forms.…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of Mixed-Stack Charge Transfer Films of 2-Octadecyl-7,7,8,8-tetracyanoquinodimethane and 3,3‘,5,5‘-Tetramethylbenzidine Prepared by the Langmuir−Blodgett Technique and Donor Doping. 1. Dependence of Thermal Behavior on the Number of Layers Studied by Ultraviolet−Visible−Near Infrared and Infrared Spectroscopies

et al. 1996

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The dependence of thermal behaviors on the number of layers in Langmuir-Blodgett (LB) films of the mixedstack charge transfer (CT) complex of 7,8, doped by 3,3′,5,5′-tetramethylbenzidine (TMB) has been investigated by using ultraviolet-visible-near infrared (UV-vis-NIR) and infrared (IR) spectroscopies. The appearance of a broad CT absorption band in the NIR region reveals that the mixed-stack CT films are formed by donor doping. The degree of the charge transfer determined by a shift of the CtN stretching band of the TCNQ chromophore verifies that the CT complex films are in a quasi-neutral state. Their temperature-dependent UV-vis-NIR and IR spectra show that donor molecules (TMB) dedope from the CT complexes in the LB films, resulting in the restoration of acceptor molecules (octadecyl-TCNQ) to their neutral states at their respective dedope temperatures. The dedope temperature of the CT complex films increases with the number of layers up to a seven-layer film. Both the UV-vis-NIR and IR spectra show that the one-layer CT complex film undergoes a progressive thermal process. In contrast, the seven-and 11-layer films are stable up to 120°C and show rather abrupt changes near their dedope temperatures. Furthermore, pre-dedope phenomena are observed for the multilayer CT complex films but not for the one-layer CT film. This dependence of the thermal behaviors of the CT films on the number of layers may be attributed to the differences in the film thickness, the longitudinal interactions between the one-dimensional needle-like microcrystals of the CT complex, and the effects of the interaction between the first layer and a CaF 2 substrate.

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“…Eqs. (1) and (2) are obtained under the consideration that the films are isotropic in the support plane [57], which has been experimentally verified by recording different absorption spectra of the LS films under normal incidence and rotating the linear polarized light [30], and similar spectra in all the experiments were obtained (data not shown).…”

Section: Characterization Of the Langmuir-schaefer Films And Porphyrimentioning

confidence: 94%

J-aggregation of a sulfonated amphiphilic porphyrin at the air–water interface as a function of pH

Miguel

Hosomizu

Umeyama

et al. 2011

Journal of Colloid and Interface Science

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Conducting Langmuir-Blodgett films

Cited by 44 publications

References 5 publications

Muonium and free-radical yields as determined by the muon level-crossing-resonance technique in aqueous and micelle solutions of acrylamide

Muonium and free-radical yields as determined by the muon level-crossing-resonance technique in aqueous and micelle solutions of acrylamide

J-aggregation of a sulfonated amphiphilic porphyrin at the air–water interface as a function of pH

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