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Area of Science:

  • Physics of soft matter
  • Materials science
  • Complex systems

Background:

  • Mechanical response of amorphous materials is governed by particle rearrangements.
  • Bubble rafts offer a quasi-two-dimensional model system for studying these phenomena.
  • Understanding bubble cluster formation and interactions is key to predicting material behavior.

Purpose of the Study:

  • Investigate mechanically stable bubble clusters in quasi-2D systems.
  • Determine the influence of interaction range (short-range vs. long-range attractive) on cluster formation.
  • Compare experimental observations with discrete element simulations.

Main Methods:

  • Coordinated experimental and computational studies of bubble rafts.
  • Focus on small bubble clusters (4-7 bubbles) with two distinct sizes.
  • Discrete element simulations to model bubble interactions and cluster stability.

Main Results:

  • Short-range attractive interactions yield a larger ensemble of stable clusters compared to long-range interactions for N > 5 bubbles.
  • Clusters formed by short-range attractions exhibit larger peripheral gaps.
  • Experimental cluster ensembles align more closely with long-range attractive interaction models.
  • Cluster frequencies are highly sensitive to generation protocols, weakly correlated with cluster energy.

Conclusions:

  • The range of inter-particle attraction significantly impacts the diversity of stable configurations in particulate systems.
  • Experimental bubble raft behavior is better described by long-range attractive interactions.
  • Cluster formation dynamics are more influenced by the generation method than by the inherent energy of the clusters.