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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Nanotechnology

Background:

  • Understanding cellulose nanofiber (CNF) adsorption at oil-water interfaces is crucial for Pickering emulsion (PE) stabilization.
  • Current models often simplify the dynamic and molecular-scale adsorption processes.

Purpose of the Study:

  • To visualize and analyze the dynamic interfacial adsorption behavior of CNF in PE at the molecular scale.
  • To develop a novel fluorescence-based strategy for studying CNF-PE interactions.

Main Methods:

  • Preparation of oil-in-water PE using fluorescence-grafted TEMPO-oxidized CNF (Acd-CNF) and Nile Red-stained dodecane.
  • Utilizing time-lapse confocal laser scanning microscopy to observe Acd-CNF adsorption onto preformed PE.
  • Detecting interfacial fluorescence response through molecular proximity of fluorophores.

Main Results:

  • Slowly introduced Acd-CNF dispersions spontaneously adsorb onto existing CNF-stabilized PE.
  • Formation of heterogeneous and multilayered interfacial architectures, not a uniform monolayer.
  • Demonstration of dynamic and hierarchical CNF adsorption processes at oil-water interfaces.

Conclusions:

  • CNF adsorption in PE is a dynamic, hierarchical process, contradicting simplified static models.
  • The fluorescence-grafting strategy offers a new experimental framework for designing PE.
  • This approach facilitates the rational design of interface-engineered soft materials.