What is liquid crystalline phase?

What is liquid crystalline phase?

Definition. Liquid crystalline phases are unlimited self-assembly structures with infinite or unlimited self-assemblies, whereby the aggregates are connected over macroscopic distances in one, two, or three dimensions, i.e., 1D, 2D, or 3D.

What is liquid crystal emulsion?

A liquid crystal emulsion is an organised substance (crystal) that can still flow (liquid). It combines the benefits of both ‘oil-in-water’ emulsions and ‘water in oil’ emulsions.

What are the phases of emulsion?

It consists of two phases continuous phase and dispersed phase. When Water act as a dispersed phase in oil which is a continuous phase in the emulsion is called water-in-oil emulsion and when oil act as a dispersed phase in water which is a continuous phase in the emulsion is called oil-in-water as shown in Fig.

What are the three different phases of liquid crystals?

Liquid crystals can be divided into thermotropic, lyotropic and metallotropic phases. Thermotropic and lyotropic liquid crystals consist mostly of organic molecules, although a few minerals are also known. Thermotropic LCs exhibit a phase transition into the liquid-crystal phase as temperature is changed.

What is liquid crystal with example?

A liquid crystal is a state of matter between liquid and solid (a “mesophase”). They change shape like a fluid but have the molecular alignment characteristics of a solid crystal.

Which liquid crystal is of pharmaceutical significance?

The two main types of liquid crystals are: smectic (soap like or grease like) or nematic (threadlike). LC based systems can provide specific advantages of thermodynamic stability, high solubilisation levels, improved bioavailability, protection against oxidation and controlled release properties to the pharmaceuticals.

Which liquid crystal has remarkable optical property of reflecting light of different Colours under different conditions?

Cholesteric liquid crystals also exhibit the unique property that they reflect circularly polarized light when it is incident along the helical axis and elliptically polarized if it comes in obliquely.

What is a three phase emulsion?

In the first example, a liquid is present in addition to the common oil and aqueous phases. The presence of the “extra” liquid facilitates the formation of an emulsion with small droplets. The second emulsion system contains small solid particles as the third phase.

What is the phase of a liquid dispersed in liquid material in an emulsion?

In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, homogenized milk, liquid biomolecular condensates, and some cutting fluids for metal working.

What are liquid crystals explain different types of liquid crystals?

There are three types of liquid crystal: nematic, smectic and cholesteric. In the liquid crystalline phase, the vector about which the molecules are preferentially oriented, n, is known as the “director”. The long axes of the molecules will tend to align in this direction.

What is liquid crystal and its classification?

Liquid crystals are classified in many ways, molecules within the mesophases (mesogens) can be calamitic (rod-like), discotic (disc-like), amphiphilic, nonamphiphilic, metal containing, non-metal containing and low molecular weight or polymeric. Liquid crystals either show thermotropic behaviour or lyotropic behaviour.

What are types of liquid crystals?

There are three types of liquid crystal: nematic, smectic and cholesteric. In the liquid crystalline phase, the vector about which the molecules are preferentially oriented, n, is known as the “director”.

What are the three parts of an emulsion?

There are three types of instability in emulsions: (1) flocculation, (2) creaming, and (3) coalescence.

What is dispersion medium and dispersed phase?

The phase that is dispersed or present in colloidal particle shape is called the dispersed phase. The medium the colloidal particles are distributed in is called the medium of dispersion. Example: Starch represents the dispersed phase in a starch solution, while water is the dispersing medium.