Soft Matter. Emulsions

REPORTS PLAN
- creation methods
- quantification
- deformation properties
- flow properties
- application

EMULSIONS IN DAILY LIFE
Vinegar
Oil
Some types of cosmetics
Also emulsions!

EMULSIONS IN SCIENCES

CREATION AND STABILIZATION
We can stabilize emulsions with surfactants!
Surfactants can create a steric barrier around each particle
Marangoni effect

DESTRUCTION AND DESTABILIZATION
Types of emulsion destruction:
- physical (aggregation and phase separation)
- chemical (change acidity index)
- with help of biological microorganisms
- creaming

COARSENING
Ostvald ripening cause a masses redistribution from small particles to large

PURIFICATION: CREAMING AND DEPLETION

MICELLES
One droplet surrounded by micelles
Overlap of excluded volumes

EMULSIONS BASED ON MICROFLUIDS
We can create emulsions based on microfluids!
Realize using hydrodynamic focusing

DENSE EMULSIONS AND JAMMING
A disorded suspension of colloid particles can exhibit a huge range of mechanical properties!
Jamming state
Dependence of tension and dynamic memory module on strain amplitude and frequency

YIELD MEASUREMENTS
The dependence of yield strain and yield stress on phase volume

LITTLE MORE ABOUT THE JAMMED STATE
In a jammed state the colloidal system can be under load.
Measurment of force change by analysis contact patches

THE FLOWING STATE
The dependence of shear stress on shear rate and shear rate on shear levels positions.