Study of the stability of monolayers based on porphyrin derivatives
A.J. Al-Alwani Faculty of Nano- and Biomedical Technologies, Saratov State University.
N.N. Begletsova Education and Research Institute of Nanostructures and Biosystems, Saratov State University.
V.F. Kabanov Faculty of Nano- and Biomedical Technologies, Saratov State University.
V.N. Mironyuk Education and Research Institute of Nanostructures and Biosystems, Saratov State University.
A.I. Mikhailov Faculty of Nano- and Biomedical Technologies, Saratov State University.
E.G. Glukhovskoy Education and Research Institute of Nanostructures and Biosystems, Saratov State University.
Abstract
In this work, we studied the stability of monolayers based on the porphyrin derivative.
The stability study was carried out on a KSV NIMA LB Trough Medium KN 2002 installation. The monolayer was compressed to a pressure of 10 mN/m and kept constant, the area versus time was recorded.
On the dependences of the decrease in the area of a monolayer at a fixed surface pressure on time, areas corresponding to two different mechanisms of relaxation of the area of a monolayer were identified. For the first section (0 - 17 min), the decrease in the relative area of the monolayer is mainly determined by the process of dissolution of the monolayer, which is limited by the diffusion of substance molecules into the volume of the liquid subphase. For the second section (18 - 60 min), the dominant mechanism of monolayer relaxation is optimization of the molecular packing in the layer with their possible rearrangement into multilayer folds (an analogue of the “collapse” state on the isotherms of monolayer compression); the growth of critical nuclei of the bulk phase dominates in this region.
The reported study was funded by RFBR according to the research project №19-07-00086
Speaker
Al-Alwani Ammar J
Saratov State University
Russia
Discussion
Ask question
