Langmuir–Blodgett films of a water-soluble polysilane based on interfacial polyion complexation

Abstract

Langmuir-Blodgett (LB) films of a water solu ble cationic polysilane are successfully prepared by ion-complexation with an arachidic acid monolayer at the air-water interface; UV absorption characteristics of the LB films are dependent on the pH of the water subphase on transfer.

Polysilanes on surfaces

“…Since various soluble (PSi)s in polar organic solvents, and even in water, have been prepared, [89][90][91][92][93] their self-assembly or orientation behaviors in solutions and/or ultrathin films have been investigated, especially with an LB method 89,94-96 and rubbing technique. 97 These film studies led to the finding of a unique ionochromism, 93 solvatochromism, and piezochromism.…”

Polyion Complex Langmuir−Blodgett Layers Containing an Ionic Water-Soluble Polysilane

“…The full deprotonation of the carboxylic acid is thus attained at a pH above 10. We previously reported on the results of these monolayer systems in the range of pH 2.0−8.0 . As shown here, deprotonation of carboxylic acid is therefore insufficient within the previous pH conditions.…”

“…These optical properties are anticipated to shed light on the main chain orientation and conformational states. We have recently developed a series of ammonium-containing polysilanes. − The materials having a long alkylammonium moiety, like other chemically functionalized polysilanes, − are amphiphilic and found to be successfully assembled as multilayers by the ordinary LB technique. − On the other hand, a compound with a trimethylammonium group (APS, Chart ) becomes water-soluble, , and this material would be used as the polyelectrolyte component in the polyion complex LB films.…”

“…This paper describes our detailed study on the preparation and structural characterization of mono- and multilayered polyion complex LB films containing APS ).…”

Interfacially formed organized planar inorganic, polymeric and composite nanostructures

“…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].…”