Printable Hydrogels Based on Alginate and Halloysite Nanotubes

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Hydrogels are crucial for controlled release applications.
• Halloysite nanotubes (HNTs) offer unique properties for drug encapsulation.
• Alginate is a biocompatible polymer widely used in drug delivery.

Purpose of the Study:

• To synthesize and characterize novel halloysite-alginate hybrid hydrogels.
• To investigate the potential of these hydrogels as drug delivery systems.
• To evaluate the effect of hydrogel morphology on drug release kinetics.

Main Methods:

• Hybrid hydrogels were prepared using halloysite nanotubes and alginate.
• Morphological characterization was performed using optical and scanning electron microscopy.
• Drug loading and release studies were conducted using salicylic acid.
• Thermogravimetric analysis and UV-Vis spectrophotometry were employed for characterization and kinetic studies.

Main Results:

• Wire-like halloysite-alginate hydrogels with diameters of 0.19 and 0.47 mm were successfully prepared.
• Encapsulated salicylic acid showed enhanced thermal stability within the nanotubes (degradation peak shifted from 193 to 267 °C).
• Drug release kinetics were significantly influenced by hydrogel morphology and dimensions, with slower release observed compared to bare halloysite.
• An induction period of 2 hours was noted for the thicker hydrogel samples.

Conclusions:

• Halloysite-alginate hybrid hydrogels are effective for controlled drug delivery.
• The wire-like morphology and dimensions of the hydrogels can be tailored to modulate drug release rates.
• These materials show potential for developing advanced drug delivery systems with tunable release profiles.