Ultrasmall Single-Chain Nanoparticles Derived from Amphiphilic Alternating Copolymers

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Materials Science

Background:

• Single-chain nanoparticles (SCNPs) mimic biological protein particles but controlling their properties is challenging.
• Achieving precise control over SC NP morphology, internal structure, size, and deformability remains a significant hurdle.

Purpose of the Study:

• To present a novel strategy for synthesizing ultrasmall and uniformly structured SCNPs.
• To demonstrate precise control over SC NP size by adjusting polymer composition.

Main Methods:

• Utilized amphiphilic alternating copolymers designed for SC NP formation.
• Employed folding in N,N-dimethylformamide (DMF) followed by photocatalyzed cycloaddition of anthracene units for structural fixation.
• Performed molecular dynamics simulations to analyze SC NP structure.

Main Results:

• Successfully produced SCNPs with ultrasmall size and uniform internal structure.
• Confirmed a solvophilic outer corona and solvophobic inner core structure via simulation.
• Achieved precise size control of SCNPs between 2.8 and 3.9 nm by tuning PEG unit length.

Conclusions:

• The developed synthetic strategy offers enhanced control over SC NP morphology and internal structure.
• This method enables the production of SCNPs with ultrasmall and uniform dimensions.
• The findings pave the way for advanced applications requiring precisely engineered nanoscale particles.