Complexes of an anionic poly(p-phenylene) polyelectrolyte and dioctadecylammonium bromide at the air–water interface

Engelking, Joachim; Ulbrich, Dagmar; Meyer, Wolfgang; Schenk‐Meuser, Karin; Duschner, H.; Menzel, Henning

doi:10.1016/s0928-4931(99)00051-x

Cited by 17 publications

(22 citation statements)

References 1 publication

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“…For complexes with PSS the area per DODA amphiphile is reduced to 0.61 nm 2 , respectively [7,29]. The area per amphiphile in the complex is close to the value found in single crystals (0.56 nm 2 [28]).…”

Section: Isotherms and Adsorption Experimentssupporting

confidence: 57%

“…The area per amphiphile is larger for the DODA/CMC complex than for the pure DODA monolayer. As has been discussed before, the different area requirements can be attributed to the differences in the distance of the ionic sites along the polymer backbone of CMC and PSS, respectively [7,23]. For the adsorption experiments the monolayer was compressed to an area of A = 0.92 nm 2 per amphiphile, which corresponds to a surface pressure of Π Start = 10 mN/m.…”

Section: Isotherms and Adsorption Experimentsmentioning

confidence: 99%

“…Another approach is to use monolayers of ionic amphiphiles at the air/water interface as a model surface for studying the interaction of polyelectrolytes with oppositely charged surfaces. The adsorption of polyelectrolytes to such model surfaces results in changes of the monolayer structure and properties like area per amphiphile or monolayer morphology, which can be monitored by several methods [5][6][7]. If the amphiphile contains azobenzene chromophores, the adsorption may result in spectroscopic changes, too [8].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of anionic polyelectrolytes to dioctadecyldimethylammonium bromide monolayers

Engelking

Menzel

2001

The European Physical Journal E

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Monolayers of dioctadecyldimethylammonium bromide (DODA) at the air/water interface were used as model for charged surfaces to study the adsorption of anionic polyelectrolytes. After spreading on a pure water surface the monolayers were compressed and subsequently transferred onto a polyelectrolyte solution employing the Fromherz technique. The polyelectrolyte adsorption was monitored by recording the changes in surface pressure at constant area. For poly(styrene sulfonate) and carboxymethylcellulose the plot of the surface pressure as function of time gave curves which indicate a direct correlation between the adsorbed amount and surface pressure as well as a solely diffusion controlled process. In the case of rigid rod-like poly(p-phenylene sulfonate)s the situation is more complicated. Plotting the surface pressure as function of time results in a curve with sigmoidal shape, characterized by an induction period. The induction period can be explained by a domain formation, which can be treated like a crystallization process. Employing the Avrami expression developed for polymer crystallization, the change in the surface pressure upon adsorption of rigid rod-like poly(p-phenylene sulfonate)s can be described.

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Section: Isotherms and Adsorption Experimentssupporting

confidence: 57%

Section: Isotherms and Adsorption Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of anionic polyelectrolytes to dioctadecyldimethylammonium bromide monolayers

Engelking

Menzel

2001

The European Physical Journal E

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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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“…Polymeric monolayers and multilayers can be formed with the use of preformed macromolecules and prepolymerized amphiphiles [268][269][270][271][272][273][274][275][276][277][278]. The other way to fabrication of polymeric films at the gas-liquid interface is the adsorption of polymer molecules from bulk liquid phase to Langmuir monolayer formed by monomeric amphiphile [279][280][281][282][283][284][285][286][287]. Electrically conductive films and patterned structures of amphiphilic polythiophenes were formed using LB technique [288].…”

Section: Organized Planar Polymeric Nanostructuresmentioning

confidence: 99%

Interfacially formed organized planar inorganic, polymeric and composite nanostructures

Хомутов

2004

Advances in Colloid and Interface Science

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Complexes of an anionic poly(p-phenylene) polyelectrolyte and dioctadecylammonium bromide at the air–water interface

Cited by 17 publications

References 1 publication

Adsorption of anionic polyelectrolytes to dioctadecyldimethylammonium bromide monolayers

Adsorption of anionic polyelectrolytes to dioctadecyldimethylammonium bromide monolayers

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

Interfacially formed organized planar inorganic, polymeric and composite nanostructures

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