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Discontinuous Structural Transitions in Fluids with Competing Interactions.

Ana M Montero1, Santos B Yuste1,2, Andrés Santos1,2

  • 1Departamento de Física, Universidad de Extremadura, E-06006 Badajoz, Spain.

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This summary is machine-generated.

Competing interactions in fluids significantly alter structural transitions. Dimensionality (1D vs. 3D) and interaction types critically influence these fluid behaviors and transitions.

Keywords:
Fisher–Widom linecompeting interactionsdiscontinuous structural crossover transitionsrational function approximationsquare shouldersquare well

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Area of Science:

  • Physical Chemistry
  • Statistical Mechanics
  • Soft Matter Physics

Background:

  • Understanding fluid behavior relies on intermolecular interactions.
  • Competing interactions lead to complex phenomena in fluids.
  • Dimensionality plays a crucial role in confinement effects.

Purpose of the Study:

  • To investigate the impact of competing intermolecular interactions on fluid structural transitions.
  • To compare these effects in one-dimensional (1D) and three-dimensional (3D) systems.
  • To analyze the influence of dimensionality on confinement effects.

Main Methods:

  • Utilized a versatile potential model with hard core and two-step interactions (wells/shoulders).
  • Derived exact results for 1D systems.
  • Employed rational function approximation for 3D systems.

Main Results:

  • Repulsive steps lead to temperature-dependent oscillatory decay of the total correlation function, with potential for discontinuous crossover lines.
  • Attractive first step and repulsive second step yield a Fisher-Widom line.
  • Dimensionality affects temperature ranges, well depths, and attenuation of observed behaviors; some 1D features may not appear in 3D.

Conclusions:

  • Fluids with competing interactions display complex structural transitions.
  • Dimensionality and specific interaction features significantly influence these transitions.
  • The study highlights the intricate interplay between interactions, dimensionality, and fluid structure.