Open AccessDynamic light scattering characterization of hard–soft gel phase transition in micellar crystal and comparison with rheological data
Author(s) -
A. F. Kostko,
Olga A. Pinchuk
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1379/1/012078
Subject(s) - dynamic light scattering , materials science , liquid crystal , rheology , phase transition , phase (matter) , crystal (programming language) , light scattering , scattering , chemical physics , optics , thermodynamics , chemistry , nanotechnology , composite material , physics , optoelectronics , organic chemistry , nanoparticle , computer science , programming language
We report the dynamic light scattering study of polymer dynamics in the broad vicinity of the hard-soft gel phase transition in micellar crystal. Inside the region of micellar crystal phase with increasing temperature the ratio of the magnitudes of two dynamic modes (slow and fast) monotonously decreases below 54 °C in the hard gel. Above 54 °C in the soft gel it is almost independent of temperature, remaining at a minimum. The method provides phenomenon details inaccessible with conventional rheological method, where simple detection of sharp phase transition is available. We show that the diffusion dynamic mode, which is common for a liquid phase, is also present in a micellar crystal despite the obvious difference in the rheological properties of micellar liquid and micellar crystal. This study demonstrates the advantages of the dynamic light scattering method at micro-scale level.