Related Experiment Video
Updated: Aug 9, 2026
12:37
Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
Phase diagrams of lyotropic cholesteric fluids
Toledano1, Figueiredo Neto AM, de Sant'Ana ZA
1Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05315-970, Sao Paulo, SP, Brazil.
Summary
Lyotropic cholesteric fluids exhibit phase diagrams influenced by micellar shape and chirality. Specific substances create two distinct biaxial cholesteric phases, explained by catastrophe theory.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Lyotropic cholesteric fluids exhibit complex phase behaviors.
- Micellar shape anisotropy and chirality are key factors in fluid organization.
Purpose of the Study:
- To investigate how micellar properties influence the phase diagrams of lyotropic cholesteric fluids.
- To identify and characterize distinct cholesteric phases under varying conditions.
Main Methods:
- Experimental studies on lyotropic cholesteric fluids.
- Analysis of temperature-concentration phase diagrams.
- Application of catastrophe theory to phase transitions.
Main Results:
- Micellar shape anisotropy and chirality were found to determine phase diagram topology.
- Two distinct biaxial cholesteric phases were observed for specific substance concentrations.
- The observed phenomena were interpreted using catastrophe theory.
Conclusions:
- The study elucidates the critical role of micellar properties in defining lyotropic cholesteric fluid phases.
- Catastrophe theory provides a framework for understanding the observed phase transitions.
More Related Videos
Related Concept Videos
01:34Fluid Mosaic Model
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
01:23Membrane Fluidity
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
02:39Phase Diagrams
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
01:26Membrane Fluidity
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
01:27Two Components: Liquid–Liquid Systems
A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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...