Self-Assembled Composite Langmuir Films via Fluorine-Containing Bola-Type Derivative with Metal Ions

Abstract

The design and preparation of functional bolaamphiphile-based composite films are of key importance for application in a wide variety of fields. This study demonstrates a new approach to constructing composite films by the Langmuir-Blodgett (LB) method using a fluorine-containing bola-type diacid derivative with different metal ions. The bola-type molecule we used could be spread on water surfaces and metal ion subphases to fabricate various nanostructured ultrathin films. The obtained data demonstrated that the employed metal ions, including Ag(I), Cu(II), and Eu(III) ions in subphase solutions, can regulate the organized molecular stacking and form interfacial nanostructures deposited in LB films. It was found that the interfacial coordinating interactions can easily occur between carboxyl groups in a molecular skeleton with metal ions in the formed composite films. The formation of composite films was confirmed by changes in the surface pressure-area isotherms, morphologies, and spectra of the transferred LB films. While various research works have achieved the regulation of functions and nanostructures of sophisticated bola-type compounds, we here demonstrate a simple routine to modulate the nanostructures and organized packing of bola-type compounds composite films by changing the metal ions in subphase solutions.

Thin Films of Lanthanide Stearates as Modifiers of the Q-Sense Device Sensor for Studying Insulin Adsorption

“…At the same time, ions of trivalent cations tend to hydrolysis and complexation more than divalent metals in an overwhelming number of cases; therefore, this problem is more relevant for trivalent ions. In this regard, works on these lanthanide salts were published much later, in spite of the fact that the production of such films was described in literature and results of the preparation multilayer LBF from acids and trivalent metals were reported. , The techniques often used to obtain these structures are not standard and have only been studied for a small number of trivalent cations. − Despite the fact that yttrium is formally trivalent, the formation of films proceeded with ease, as with films containing ordinary divalent cations. Yttrium stearate was studied in ref , where it was shown that the ion fraction form of the yttrium content in the film depends on the pH of the subphase.…”