In the statistical mechanics approach to liquid-state theory, understanding the role of the intermolecular potential in determining thermodynamic and structural properties is crucial. The Fisher--Widom (FW) line, which separates regions in the temperature vs density plane where the decay of the total correlation function is monotonic or oscillatory, provides insights into the dominance of the attractive or repulsive part of the interactions. Stopper et al. have recently conjectured [J. Chem. Phys. \textbf{151}, 014501 (2019)] that the line of vanishing excess isothermal compressibility approximates the FW line in simple fluids. Here, we investigate this conjecture using the Jagla potential and also explore the line of vanishing excess pressure. We employ theoretical approximations and Monte Carlo simulations to study one-dimensional and three-dimensional systems. While exact results for the one-dimensional case do not support the conjecture, our Monte Carlo simulations for the three-dimensional fluid validate it. Our findings not only contribute to the understanding of the relationship between the three transition lines but also provide valuable insights into the thermodynamic and structural behaviour of simple fluids.
Density Functional Theory Predictions of Derivative Thermodynamic Properties of a Confined Fluid
New Jersey Institute of Technology（新泽理工学院）；Otto H. York Department of Chemical and Materials Engineering, New Jersey Institute of Technology（新泽理工学院 Otto H. York 化学与材料工程系）；Institut für Nichtklassische Chemie e. V.（非经典化学协会）
Pressure effects in the properties of simple monohydric alcohols. Lessons from molecular dynamics simulations of united atom type UAM-EW model
Instituto de de Química, Universidad Nacional Autónoma de México（墨西哥国立自治大学化学研究所）；Wigner Research Centre for Physics（维格纳物理研究中心）；Faculty for Advanced Science and Technology, Kumamoto University（熊本大学先进科学技术学院）
