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Measuring Solvent Exchange in Silica Nanoparticles with Rotor-Based Fluorophore.

Xuejun Cheng1,2,3, Yingming Pu2,3, Songtao Ye2,3

  • 1Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China.

Advanced Materials (Deerfield Beach, Fla.)
|September 29, 2023
PubMed
Summary
This summary is machine-generated.

This study developed a new method to measure solvent diffusion in silica micropores using a fluorescent probe. The technique offers millisecond resolution for tracking solvent exchange dynamics.

Keywords:
fluorescencesilicasolvent diffusionstopped-flowthioflavin T

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Measuring molecular diffusivity is crucial for understanding and controlling diffusion processes.
  • Challenges in diffusivity measurements increase with smaller molecules, especially non-fluorescent and non-reactive ones like solvents.
  • Silica micropores present a highly viscous microenvironment influenced by solvent polarity.

Purpose of the Study:

  • To demonstrate a method for monitoring solvent exchange within silica micropores with millisecond time resolution.
  • To develop a technique for measuring the diffusion coefficients of solvents in silica.
  • To validate the effectiveness and sensitivity of the developed method.

Main Methods:

  • Embedding a rotor-based fluorophore (thioflavin T) within colloidal silica nanoparticles.
  • Monitoring solvent exchange processes by analyzing fluorescence intensity changes over time.
  • Fitting fluorescence intensity traces to the Fickian diffusion model for analytical solutions.

Main Results:

  • Successfully demonstrated millisecond time-resolution monitoring of solvent exchange in silica micropores.
  • Obtained diffusion coefficients by fitting fluorescence data to the Fickian diffusion model.
  • Validated the method through water-to-ethanol and ethanol-to-water exchange experiments, varying drying conditions and silica cross-linking.

Conclusions:

  • The developed method enables sensitive and effective characterization of diffusion dynamics in silica micropores.
  • High temporal resolution tracking of solvent exchange over short distances opens new avenues for diffusion studies.
  • This technique is valuable for studying diffusion of non-fluorescent and non-reactive molecules in confined environments.