Understanding associative polymer self-assembly with shrinking gate fluorescence correlation spectroscopy - Archive ouverte HAL
Article Dans Une Revue Nanoscale Année : 2024

Understanding associative polymer self-assembly with shrinking gate fluorescence correlation spectroscopy

Résumé

The self-assembly of polymers is integral to their role in liquid formulations. In this study, we combine a dye whose lifetime is sensitive to the nanoviscosity of its local environment with shrinking gate fluorescence correlation spectroscopy (sgFCS) to study the self-assembly of a model telechelic polymer, hydrophobically modified ethoxylated urethane (HEUR). Fluorescence lifetime measurements show a monotonic increase in average lifetime with increasing HEUR concentration driven by a small fraction of dye (<1%) with long lifetimes strongly bound to HEUR. Despite this small fraction, sgFCS isolates the diffusional dynamics of the bound fraction with no a priori assumptions as to the distribution of lifetimes. Sensitivity is greatly enhanced compared to standard FCS, revealing micellar aggregates forming between 0.2 and 1 wt% followed by formation of a percolated network. This sgFCS approach, which we apply for the first time to polymers in this work, is readily extendable to any dye that changes lifetime on binding.
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Dates et versions

hal-04636329 , version 1 (05-07-2024)

Identifiants

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Timothy J Murdoch, Baptiste Quienne, Julien Pinaud, Sylvain Caillol, Ignacio Martín-Fabiani. Understanding associative polymer self-assembly with shrinking gate fluorescence correlation spectroscopy. Nanoscale, 2024, 16 (26), pp.12660-12669. ⟨10.1039/D4NR00737A⟩. ⟨hal-04636329⟩
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