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Area of Science:

  • Materials Science
  • Biophysics
  • Nanotechnology

Background:

  • Liposomes, such as 1,2 dioleolyl-sn-glycero-3-phosphatidylcholine (DOPC) vesicles, are widely used in drug delivery and biomaterials.
  • Cellulose nanocrystals (CNCs) are sustainable nanomaterials with unique properties, attracting interest for composite materials and biomedical applications.
  • Understanding the interaction between liposomes and nanomaterials is crucial for developing advanced functional systems.

Purpose of the Study:

  • To investigate the interaction between DOPC vesicles and CNCs.
  • To characterize the formation and thermodynamic properties of CNC-liposome complexes.
  • To elucidate the role of pH and surface charge in this interaction.

Main Methods:

  • Dynamic light scattering (DLS) for size analysis.
  • Zeta-potential measurements to determine surface charge.
  • Cryo-transmission electron microscopy (Cryo-TEM) for structural visualization.
  • Isothermal titration calorimetry (ITC) for thermodynamic characterization.

Main Results:

  • Formation of pH-dependent complexes between DOPC vesicles and CNCs was confirmed.
  • The association was more pronounced at lower pH values.
  • ITC revealed positive enthalpy values at pH < 5, suggesting counterion release from hydration shells.
  • Surface charge of the vesicles significantly influences the interaction.

Conclusions:

  • The interaction between DOPC vesicles and CNCs is primarily governed by electrostatic forces and is pH-dependent.
  • Counterion release contributes to the observed positive enthalpy of association.
  • These findings provide insights into the design of CNC-based hybrid materials with controlled liposome interactions.