What is phase inversion temperature method?
1.2. Phase inversion temperature (PIT) The phase inversion is defined as the transition of an oil-in-water (O/W) to a water-in-oil (W/O) emulsion (and vice versa) resulting from the change of the surfactant affinity from water to oil (and vice versa).
What is phase inversion of emulsion?
Emulsion phase inversion is the process of interconversion between two types of simple emulsions: water-in-oil and oil-in-water emulsions. Phase inversion can be induced by shifting the emulsifier affinity from one phase to the other, which is called transitional phase inversion.
What is microemulsion method?
The microemulsion technique promises to be one of the versatile preparation method which enables to control the particle properties such as mechanisms of particle size control, geometry, morphology, homogeneity and surface area.
What is phase inversion in pharmacy?
Phase inversion refers to a phenomenon that occurs when agitated oil in water emulsion, reverts to a water in oil and vice versa. Emulsification via phase inversion is widely used in fabrication of cosmetic products, pharmaceutical products (e.g., vesicles for drug delivery), foodstuff and detergents.
Is phase inversion reversible?
The reversible phase inversion of the emulsion has a benefit of dealing with drilling cutting, so the reversible invert emulsion also can be thought used as a drilling fluid. The phase inversion from w/o emulsion to o/w emulsion can be divided into three stages. They are w/o emulsion, w/o/w emulsion, and o/w emulsion.
What is instability emulsion?
There are three types of instability in emulsions: (1) flocculation, (2) creaming, and (3) coalescence. Flocculation occurs when there is an attractive force between the droplets, so they form flocs. Creaming occurs when the droplets rise to the top of the emulsion under the influence of buoyancy.
Is phase inversion of emulsion reversible?
The reversible phase inversion of the emulsion has a benefit of dealing with drilling cutting, so the reversible invert emulsion also can be thought used as a drilling fluid. The phase inversion from w/o emulsion to o/w emulsion can be divided into three stages.
What is phase inversion temperature in emulsion?
The phase inversion temperature (PIT), at which an oil-in-water emulsion becomes a water-in-oil emulsion, is a crucial process parameter. The higher the phase inversion temperature, the more stable is the oil-in-water emulsion at ambient temperature [l].
What is microemulsion polymerization process?
Definition. Microemulsion polymerization is defined as polymerization involving a radical chain propagation reaction with vinyl monomers in one phase of a microemulsion, and the produced polymer colloid is denoted as latex.
How do you make microemulsion?
The formulation is prepared above the melting point of the lipid to form the microemulsion. Lipid (fatty acid or glycerides) is dissolved; surfactant, cosurfactant, and active ingredient solution in water is heated to the same temperature and the resulting mixture is added to the lipids.
What is inversion of phase give an example?
In emulsions a phase inversion is when the dispersed phase becomes the dispersion medium and the dispersion medium becomes the dispersed phase, for example when cream becomes butter.
What are the two 2 stages of emulsion?
There are generally two distinct forms of two-phase emulsion: (i) water-in-oil (W/O) and (ii) oil-in-water (O/W). An emulsion that consists of water droplets dispersed in an oil phase is known as W/O emulsion, and the emulsion that consists of. The schematic representation of W/O and O/W emulsions is shown in Fig. 1.
What is the best way to induce phase inversion?
Two main ways to induce phase inversion are described in the literature, i.e., phase inversion composition (PIC or catastrophic) and phase inversion temperature (PIT or transitional). In the former, starting from one phase (oil or water) with surfactants, the other phase is more or less gradually added until it reverts to the continuous phase.
What is phase inversion in emulsions?
Phase inversion is an important industrial process to make stable emulsions. Phase inversion can be driven by composition or temperature changes. Phase behavior or interfacial properties or mixing of the phases has been studied.
What is phase inversion temperature (pit)?
Phase inversion temperature (PIT) PIT is a low-energy emulsification method for preparing nanoemulsions which make changes in the optimum curvature of surfactants at constant composition by changing the temperature.
How to prepare nanoemulsions using pit method?
In the PIT method, nanoemulsions are prepared by the formation of microemulsions at its PIT followed by immediate cooling to room temperature which can be divided into 3 main steps: Non-ionic surfactant, oil and water are stirred at room temperature to form a coarse emulsion. The mixture is then gradually heated up to around or above the PIT.