Structures and photoisomerization of the polyion complex Langmuir-Blodgett films of an amphiphile bearing two azobenzene units

Tachibana, Hiroaki; Azumi, Reiko; Tanaka, Mieko; Matsumoto, Mutsuyoshi; Sako, Shin-ichi; Sakai, Hideki; Abe, Masahiko; Kondo, Yukishige; Yoshino, Norio

doi:10.1016/s0040-6090(95)08274-3

Cited by 34 publications

(27 citation statements)

References 12 publications

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“…The residual birefringence, on the other hand, was higher for the SC film that retains 72% of the maximum signal after the writing laser was turned off, to be compared with 45% for LB and LS films. This was not expected because residual birefringence is generally higher for LB films [3,27,28]. However, a similar result was reported for an epoxy-amine system [25], where the lower residual birefringence for LB films was ascribed to the same factors that induce high chromophore mobility and lead to faster writing times and high birefringence values.…”

Section: Homopolymer P4vp(do13)supporting

confidence: 57%

Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers

et al. 2014

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Section: Homopolymer P4vp(do13)supporting

confidence: 57%

Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers

et al. 2014

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“…The compensation of competing effects is also related to the restrictions in the chromophores mobility in an LB film, which affect both the photoisomerization efficiency and the kinetics of writing and decay. For example when chromophores are closely packed into an ordered structure such as LB films, photoisomerization is hampered because of the lack of free volume [33,34]. The A 5 values correspond to the birefringence kept after long times, which will be discussed below in the analysis of the residual birefringence.…”

Section: Tablementioning

confidence: 99%

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Ceridório¹,

Balogh²,

Caseli

et al. 2010

Journal of Colloid and Interface Science

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a b s t r a c tThe applicability of azopolymers in optical storage can be extended through the use of nanostructured films produced with the Langmuir-Blodgett (LB) technique, but the film properties need to be optimized since these polymers generally do not form stable Langmuir films to be transferred onto solid substrates. Here, photoinduced birefringence was investigated for mixed Langmuir-Blodgett films from the homo-0 -nitroazobenzene (HPDR1-MA) and poly(dodecylmethacrylate) (HPDod-MA). The interactions between these polymers were studied in Langmuir and LB films. Surface pressure-area isotherms pointed to molecular-level interactions for proportions of 51 mf%, 41 mf% and 31 mf% of HPDR1-MA. Phase segregation was not apparent in the BAM images, in which the morphology of the blend film was clearly different from that of the Langmuir films of neat homopolymers. Through PM-IRRAS, we noted that the interaction between the azopolymer and HPDod-MA affected the orientation of carbonyl groups. Strong interactions for the mixture with 41 mf% of poly(dodecylmethacrylate) led to stable Langmuir films that were transferred onto solid supports as LB films. The photoinduced birefringence of 101-layer mixed LB films show features that make these films useful for optical storage, with the advantage of short writing times in comparison to other azopolymer films.

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“…4,5 This complex formation between a monolayer at the air/ water interface and a polyelectrolyte dissolved in the subphase provides a versatile way to combine in thin films the properties of water-soluble polyelectrolytes and ionic amphiphiles. 6 This method was previously used to increase the monolayer stability, thus enabling monolayer transfer, 4,5,7 to adjust the area per azobenzene amphiphile, thus enabling photoisomerization, [8][9][10][11] and to control membrane permeability. 12,13 These effects rely on structural changes in the monolayer upon adsorption of the polyelectrolyte to the monolayer and subsequent complex formation.…”

Section: Introductionmentioning

confidence: 99%

Piezochromic Effect and Orientational Order in Monolayers and LB Multilayers of Poly(p-phenylenesulfonate)− Dioctadecyldimethylammonium Bromide Complexes

2000

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By spreading dioctadecyldimethylammonium bromide (DODA) on a subphase containing rigid-rod-like poly(p-phenylenesulfonate)s (PPPS), polyelectrolyte complexes are formed in situ at the air-water interface. These complex monolayers are investigated by recording surface pressure/area isotherms, UV/vis spectroscopy, and, after transfer onto a solid substrate, X-ray photoelectron spectroscopy (XPS) and X-ray reflectivity (XR). XPS and XR measurements indicate that although the polyelectrolytes are aggregated in aqueous solution, the complexes are stoichiometric. The isotherms show that the area per amphiphile in the complex monolayer is significantly higher than in the monolayer of pure DODA. This is due to the distance of the ionic sites along the rigid-rod-like polymer chain and results in a more tilted arrangement of the alkyl chains as confirmed by the XR measurements. UV/vis spectroscopy reveals that the A-band of the PPPS is red-shifted in the complex, and a further red shift of the A-band upon compression of the complex monolayer is observed. This two-dimensional piezochromic effect is discussed to be a result of the electronic interaction of the π-systems, which improves with decreasing distance during compression. Upon transfer to solid substrates the rigid-rod-like polyelectrolytes are oriented to be parallel to the dipping direction as evidenced by polarized UV/vis spectroscopy. The degree of order in the LB film shows a linear dependence on the axial ratio of the rigid-rod-like PPPS.

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Structures and photoisomerization of the polyion complex Langmuir-Blodgett films of an amphiphile bearing two azobenzene units

Cited by 34 publications

References 12 publications

Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers

Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Piezochromic Effect and Orientational Order in Monolayers and LB Multilayers of Poly(p-phenylenesulfonate)− Dioctadecyldimethylammonium Bromide Complexes

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