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Related Experiment Video

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Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells

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Published on: February 9, 2012

Visualization of the Sol-Gel Transition in Porous Networks Using Fluorescent Viscosity-Sensitive Probes.

Romane Le Dizès Castell¹, Elham Mirzahossein¹, Marion Grzelka²

¹Institute of Physics, University of Amsterdam, Amsterdam 1098XH, The Netherlands.

The Journal of Physical Chemistry Letters

|January 11, 2024

Summary

This summary is machine-generated.

This study visualizes microscale viscosity changes during the sol-gel transition in porous materials. It reveals how solvent evaporation drives gelation near surfaces, impacting porous artifact restoration.

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Area of Science:

Materials Science
Chemical Engineering
Physical Chemistry

Background:

The sol-gel transition converts suspensions into gels, crucial for reinforcing porous materials.
The effect of porous network geometry on gelation dynamics is not well understood.

Purpose of the Study:

To visualize microscale viscosity changes during the sol-gel transition in methyltriethoxysilane solutions within porous media.
To elucidate the impact of pore geometry and solvent evaporation on gelation dynamics.

Main Methods:

Utilized fluorescent viscosity-sensitive molecular rotors for microscale observation.
Employed confocal microscopy to visualize gelation within model porous structures.
Investigated methyltriethoxysilane solutions under controlled evaporation conditions.

Main Results:

Observed the development of a viscosity gradient near the free surface due to solvent evaporation.
Demonstrated that this gradient triggers sol-gel transition in pores close to the surface.
Showed that homogeneous media form a surface 'skin,' reducing evaporation, while heterogeneous media exhibit a gel density gradient.

Conclusions:

Pore geometry significantly influences sol-gel transition dynamics, primarily driven by surface evaporation.
Gel formation initiates near the surface and progresses inward, with pore size and connectivity dictating gel density distribution.
Findings are critical for optimizing the use of sol-gel processes in porous material conservation and restoration.