Related Experiment Video
Updated: Jul 19, 2026
12:37
Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
Physical properties of phase-change emulsions
Drew R Evans1, Drew F Parsons, Vincent S J Craig
1Department of Applied Mathematics, RSPhysSE, Australian National University, Canberra 0200 Australian Capital Territory, Australia.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 1, 2006
Summary
Phase-change emulsions (PCE) activation is now theoretically described. Droplet size significantly impacts transition temperature and volume, crucial for applications like ultrasound imaging and explosives.
Area of Science:
- Physical Chemistry
- Materials Science
- Chemical Engineering
Background:
- Phase-change emulsions (PCE) are vital in diverse fields, including medical imaging and industrial explosives.
- Existing theories inadequately explain the activation properties of PCEs.
- PCEs comprise a low-boiling-point liquid (volatile phase) dispersed in an aqueous phase.
Purpose of the Study:
- To develop a theoretical framework for understanding PCE activation.
- To elucidate the relationship between initial droplet radius and emulsion properties.
- To investigate factors influencing volatile phase behavior within the emulsion.
Main Methods:
- Theoretical modeling of boiling point and freezing point changes in the volatile phase.
- Analysis of droplet volume changes as a function of initial droplet radius.
- Inclusion of confinement effects on volatile phase properties.
Main Results:
- The study presents a theoretical description of PCE activation properties.
- Transition temperature and final emulsion volume are shown to be highly dependent on initial droplet radius.
- The influence of volatile phase solubility, interfacial tension, and temperature on emulsion behavior is explored.
Conclusions:
- A comprehensive theory for phase-change emulsion activation is established.
- The findings provide critical insights for optimizing PCE performance in various applications.
- A novel method for measuring gas diffusivity in the continuous phase is derived.
Related Concept Videos
01:19Phase Changes
Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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...
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,...
01:19Phase Diagram
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
01:24Phase Diagram
A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...