Self-assembled Fluorescent Nanoparticles with Tunable LCST Behavior in Water

Area of Science:

• Materials Science
• Organic Chemistry
• Supramolecular Chemistry

Background:

• Stimuli-responsive fluorescent materials are crucial for advanced applications.
• Organic molecules offer versatile platforms for designing such materials.
• Aggregation-induced emission (AIE) and temperature responsiveness are key properties for smart materials.

Purpose of the Study:

• To design and synthesize an amphiphilic molecule for stimuli-responsive fluorescent nanoparticles in water.
• To investigate the self-assembly behavior and responsive properties of the synthesized molecule.
• To explore the potential of these nanoparticles as fluorescence thermometers and for bioimaging.

Main Methods:

• Synthesis of an amphiphilic molecule M with a fixed tetraphenylethylene (FTPE) moiety and tri(ethylene glycol) (TEG) chains.
• Self-assembly of molecule M into fluorescent nanoparticles (NPs) in aqueous media.
• Characterization of NPs' lower critical solution temperature (LCST) behavior and clouding point tunability.
• Evaluation of NPs as fluorescence thermometers and for bioimaging applications.

Main Results:

• An amphiphilic molecule M was successfully synthesized, featuring AIE-active FTPE and thermo-responsive TEG.
• M self-assembled into fluorescent NPs in water exhibiting LCST behavior.
• The clouding point of the NPs was reversibly tuned by concentration.
• The NPs demonstrated potential as fluorescence thermometers in aqueous solutions.

Conclusions:

• The study presents an effective strategy for integrating AIE and LCST properties into organic fluorescent materials.
• The developed nanoparticles show promise for applications in bioimaging and biosensing due to their stimuli-responsive nature.
• This work contributes to the development of advanced fluorescent probes for biological systems.