Thermoresponsive hydrogels physically crosslinked with magnetically modified LAPONITE® nanoparticles

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Growing interest in hydrogel nanocomposites for biomedical applications.
• Need for improved mechanical properties and controlled drug delivery systems.
• Iron oxides and LAPONITE® offer magnetic properties, biocompatibility, and mechanical reinforcement.

Purpose of the Study:

• To synthesize and characterize magnetic LAPONITE® (LAM) nanoparticles.
• To investigate the effects of hydrogel composition on thermoresponsive properties.
• To evaluate hydrogel sorption and release of 5-fluorouracil.

Main Methods:

• One-step coprecipitation for synthesizing LAM nanoparticles with varying magnetite-to-LAPONITE® ratios.
• Physical crosslinking of poly(N-isopropylacrylamide) with LAM nanoparticles.
• Characterization of hydrogel nanocomposites' thermoresponsive behavior and drug release kinetics.

Main Results:

• LAM nanoparticles exhibited improved ferrofluidic properties with increased magnetite concentration.
• 5-fluorouracil absorptivity decreased with higher magnetite content.
• Hydrogel nanocomposites demonstrated a distinct volume phase transition between 33-36 °C, enabling controlled drug release.

Conclusions:

• Magnetic thermosensitive hydrogel nanocomposites were successfully fabricated.
• Composition and structure influence thermoresponsive properties and drug release.
• These materials hold promise for targeted drug delivery in biomedical applications.