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The Why and How of Ultrasmall Nanoparticles
Matthias Epple1, Vincent M Rotello2, Kenneth Dawson3
1Inorganic Chemistry and Centre for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstrasse 5-7, 45117 Essen, Germany.
Accounts of Chemical Research
|November 15, 2023
Summary
Ultrasmall nanoparticles (<10 nm) offer unique advantages, evading immune defenses and enabling passive diffusion like small molecules. Their precise architecture allows targeted interactions, opening new avenues in nanomedicine.
Area of Science:
- Nanotechnology and Materials Science
- Biomedical Engineering
- Pharmacology
Background:
- Nanoparticles exhibit distinct biological attributes based on size-scale regimes.
- Larger nanoparticles (>300 nm) are cleared by the immune system; mid-sized (20-300 nm) engage complex cellular recognition.
- The ultrasmall regime (<10 nm) simplifies cellular and immune recognition due to rapid surface exchange.
Purpose of the Study:
- To explore the unique properties and opportunities of ultrasmall nanoparticles.
- To summarize the current state of ultrasmall nanoparticle research and identify key challenges.
- To investigate the interface between cellular recognition and the quasi-molecular regime of ultrasmall nanoparticles.
Main Methods:
- Controlled synthesis of atomically precise nanoparticles and metalloid clusters.
- Surface modification with ligands for tailored biosystem interactions.
- Advanced characterization using techniques like single crystal X-ray structure analysis and NMR spectroscopy.
Main Results:
- Ultrasmall nanoparticles can penetrate biological barriers via passive diffusion, similar to small molecule drugs.
- These particles evade larger-scale cellular and immune recognition mechanisms.
- Precise architectural control enables flexible exploitation of molecular interactions for specific targeting.
Conclusions:
- Ultrasmall nanoparticles represent a unique size regime with significant potential for novel applications.
- Advances in synthesis and characterization facilitate precise control over nanoparticle architecture and function.
- This field offers promising directions for developing advanced therapeutic and diagnostic tools.
