Related Experiment Video
Updated: May 30, 2026
06:26
Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
Unusual phase behavior of one-component systems with two-scale isotropic interactions
S V Buldyrev1, G Malescio, C A Angell
1Department of Physics, Yeshiva University, 500 West 185th Street, New York, NY 10033, USA.
Summary
Systems with two repulsive length scales exhibit unusual phase behaviors. This includes polyamorphism, water-like anomalies, and anomalous melting, offering insights into particle interactions.
Area of Science:
- Condensed matter physics
- Statistical mechanics
- Materials science
Background:
- Particle interactions govern material properties.
- Understanding phase behavior is crucial for materials design.
Purpose of the Study:
- Investigate phase behavior of particles with specific potentials.
- Explore origins of unusual liquid and glassy states.
Main Methods:
- Simulated systems with pair potentials.
- Employed potentials with hard core and soft repulsion.
- Varied soft repulsion forms (square shoulder, linear ramp, quasi-exponential).
Main Results:
- Identified two repulsive length scales in potentials.
- Observed polyamorphism in equilibrium liquid and glassy states.
- Found water-like anomalies and anomalous melting at high pressures.
Conclusions:
- Two repulsive length scales drive unique phase behaviors.
- Potential for designing materials with tailored properties.
- Explains anomalies observed in certain liquid systems.
Related Concept Videos
01:20The Phase Rule
The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
01:24A Single-Component System
In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:28Phase Diagrams of Ternary Systems
Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
02:31Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:21Phase Transitions
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...