Polymerized ion pair amphiphile vesicles with pH-sensitive transformation and controlled release property

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Polymer Chemistry

Background:

• Ion pair amphiphiles (IPA) are synthesized using proton-deionizable ammonium and anionic carboxylate surfactants.
• These surfactants incorporate a polymerizable dithiolane ring for creating robust structures.
• The goal is to develop responsive microcapsules for advanced applications.

Purpose of the Study:

• To create pH-sensitive polymerized microcapsules using IPA.
• To investigate the pH-triggered transformation and material release mechanism.
• To explore the potential of these smart vesicles in drug delivery systems.

Main Methods:

• Synthesis of ion pair amphiphiles with polymerizable groups.
• Formation of vesicles and subsequent polymerization.
• Characterization of vesicle properties including turbidity, zeta potential, and surface tension.
• Monitoring the release rate of encapsulated markers.

Main Results:

• Successful preparation of IPA-based vesicles capable of pH-dependent transformation.
• Demonstrated transformation and material release under basic conditions.
• Correlation of physical properties (turbidity, zeta potential, surface tension) with vesicle behavior.
• Quantification of marker release rate through the vesicle membrane.

Conclusions:

• Polymerized IPA vesicles exhibit significant pH-sensitivity and structural transformation.
• These smart vesicles are promising for controlled release applications, particularly in drug delivery.
• Understanding the physical properties is key to optimizing the responsive behavior of these systems.