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Mapping heterogeneous polarity in multicompartment nanoparticles.

Francesco Palomba1, Damiano Genovese2, Luca Petrizza1

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This study introduces nanopolarity mapping, a novel method using solvatochromic dyes and Förster Resonance Energy Transfer (FRET) to detail polarity within nanomaterials for applications like nanoreactors and drug delivery.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Understanding the internal polarity of nanomaterials is crucial for optimizing their performance in diverse applications.
  • Heterogeneous polarity within nanostructures influences their function as nanoreactors, catalysts, and in drug delivery systems.

Purpose of the Study:

  • To develop and validate a quantitative method for mapping detailed polarity gradients within multicompartment nanostructures.
  • To demonstrate the capability of the proposed method in characterizing complex nanopolar environments.

Main Methods:

  • A two-step procedure involving spectral deconvolution of solvatochromic probes and spectrally resolved Förster Resonance Energy Transfer (FRET) analysis.
  • Utilizing Prodan and Nile Red as solvatochromic dyes to probe and map polarity in PluS nanoparticles (NPs).
  • Nanopolarity mapping via FRET to achieve spatial correlation of polarities within nanometer resolution.

Main Results:

  • The method successfully revealed a wide range of nanopolarities within the PluS NPs, indicating diverse microenvironments.
  • FRET analysis demonstrated efficient energy transfer between dyes, highlighting the proximity of hydrophobic and hydrated regions.
  • The technique quantitatively distinguished between internal and external water environments within the nanomaterial.

Conclusions:

  • The proposed nanopolarity mapping method provides detailed, quantitative insights into heterogeneous polarity within nanostructures.
  • This technique is versatile and applicable to a broad spectrum of nanomaterials for advanced characterization.
  • Accurate polarity mapping is essential for designing and improving nanomaterials for nanoreactors, catalysis, and drug delivery.