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Structure transition in cluster-cluster aggregation under external fields

Tan1, Zou, Zhang

  • 1Department of Physics, Wuhan University, Wuhan 430072, People's Republic of China.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
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External electric fields drive structural transitions in cluster-cluster aggregation (CCA). Simulations show a shift from disordered to ordered chainlike patterns as field strength increases, impacting fractal dimensions.

Area of Science:

  • Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Cluster-cluster aggregation (CCA) is a fundamental process in materials science.
  • Understanding how external fields influence aggregate structure is crucial for material design.
  • Previous studies have explored aggregation under various conditions, but field-induced transitions require further investigation.

Purpose of the Study:

  • To investigate the structure transition in cluster-cluster aggregation (CCA) under external electric fields.
  • To quantify the relationship between electric field strength and aggregate morphology.
  • To elucidate the underlying mechanisms driving the transition from disordered to ordered structures.

Main Methods:

  • Computer simulations using off-lattice CCA models.

Related Experiment Videos

  • Incorporation of field-induced dipolar interactions and thermal effects.
  • Application of the Metropolis algorithm for aggregate generation.
  • Analysis of fractal dimension (D(f)) as a function of electric field strength parameter (K).

    • Main Results:

    • A gradual transition from diffusion-limited CCA to chainlike patterns was observed as parameter K (field strength relative to thermal energy) increased.
    • The fractal dimension D(f) was found to follow the relation D(f)=D(E)+(D(DLCA)-D(E))e(-betaK) with beta=0.64.
    • The transition represents a shift from a disordered to a more ordered structure.

    Conclusions:

    • External electric fields significantly alter CCA morphology.
    • The balance between field-induced dipolar interactions and thermal energy governs the observed structure transition.
    • The findings provide insights into controlling aggregate structures through external field manipulation.