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Resolving Nonequilibrium Shape Variations among Millions of Gold Nanoparticles
Zhou Shen1,2,3, Paul Lourdu Xavier2,4,5,6, Richard Bean6
1Department of Physics, National University of Singapore, 117551 Singapore.
ACS Nano
|May 29, 2024
Summary
High-throughput single-particle imaging using X-ray free-electron lasers (XFELs) now enables detailed analysis of nanoparticle shape distributions. This advancement transforms nanoparticle characterization from anecdotal to statistically meaningful.
Area of Science:
- Materials Science
- Nanotechnology
- Biophysics
Background:
- Nanoparticles exhibit structural heterogeneity crucial for their function.
- High-throughput single-particle imaging (SPI) with X-ray free-electron lasers (XFELs) offers new possibilities for studying these heterogeneous nanoparticles.
Purpose of the Study:
- To overcome key challenges in analyzing XFEL-SPI data for nanoparticle shape distributions.
- To enable statistically meaningful characterization of nanoparticle shapes from large datasets.
Main Methods:
- Developed methods for simultaneous parametrization of structural variability in real and reciprocal spaces.
- Implemented efficient inference of latent parameters for each SPI measurement.
- Scaled up comparisons between structural models and XFEL-SPI measurements.
Main Results:
- Resolved nonequilibrium shape distributions of millions of gold nanoparticles using XFEL SPI.
- Quantified particle asymmetry and identified a stable "shape envelope" among nanoparticles.
- Discerned finite-size effects and extrapolated shapes to their thermodynamic limit.
Conclusions:
- XFEL SPI successfully overcomes previous limitations in nanoparticle characterization.
- This technique provides statistically robust insights into nanoparticle shape heterogeneity.
- The findings pave the way for more precise nanoparticle design and application.
