|
Résumé :
|
An innovative approach to creating a dynamically controllable smart surface is proposed, incorporating the reversible reaction of CO2 with free primary and secondary amines of amino-terminated self-assembled monolayers (SAMs). Solutions of N-(2-an-dnoethyl)(3-an-dnopropyl)methyidimethoxysilane (AEAPMDS), N-(6-aminohexyl)-3-aminopropyitrimethoxysilane (AHAPTS), and trimethoxysilylpropyl(polyethleneimine) (PEI-silane) were exposed to CO2, producing the respective carbamate species. The reacted CO2 was readily released by application of moderate heating and reduced pressure. Theonogravametric analysis (TGA) showed a weight loss percentage corresponding to 1 mol of CO2 per 1 mol of diamine at roughly 50 °C, and attenuated total reflectance Fourier transform infrared (ATR FTIR) spectroscopy confirmed the formation of the carbamate species. Well-ordered amino-terminal SAMs of AEAPMDS, AHAPTS, and PEI-silane were prepared on silicon substrates from toluene solutions and were then exposed to CO2, The subsequent changes in the surface structure and wettability were characterized by variable-angle ellipsometry, atomic force microscopy (AFM), and static contact-angle goniometry. The SAMs showed a reversible change in layer thickness coupled with an increase in hydrophilicity upon CO2 exposure.
|
