Definition of
Immiscible
The word immiscible is not contemplated within dictionary of the Royal Spanish Academy (RAE) but, even so, it is widely used in the field of chemistry. As deduced from practice, it is a concept that derives from miscibilityas the particularity or property of certain substances is known for combine or mix in different proportions and form from it a homogeneous solution.
The most common is that this notion is applied to the liquids, although it can also refer to solid materials or gases. When two substances have the ability to form a homogeneous solution beyond the proportions involved, they are said to be miscible. On the other hand, if they do not have such capacity, they will be classified as immiscible.
This means that any substance that fails to form a homogeneous strip no way. An example of an immiscible substance is water with the ethyl ether. The miscibility of organic substances and lipids with water is determined by the properties of the hydrocarbon chain.
- Properties of immiscible mixtures
- Techniques to grant more resistance
- immiscible metals
Properties of immiscible mixtures
When determining or establishing what are the properties of the so-called immiscible mixtures that take place within the chemical sector, it must be emphasized that various elements take center stage, such as the glass transition temperature. Said value is represented as Tg and it must be emphasized that it is double in any type of immiscible mixture, since each of the two amorphous polymers that give rise to it maintain its own temperature of this type.
This gives rise to the fact that if any scientist analyzes a certain mixture and only discovers a glass transition temperature, his main conclusion will be that it is totally miscible.
In addition to this underlined hallmark, it is also important to make clear that said immiscible mixtures are much more fragile than those that are not of that same class. However, there are a number of techniques to get them to reach greater resistance.
It can serve you: heterogeneous mixture
Techniques to grant more resistance
Thus, among the methods used to achieve this objective is, for example, proceeding to process them under flow thanks to the fact that rods are formed that function as fibers of a reinforced composite material.
Another second technique widely used to achieve that hardness of immiscible mixtures is to use equivalent amounts of the two polymers that shape them. The third method that can be used is to bet on including a compatibilizer thanks to which the union is achieved in a much more compact way.
See also: Flow
immiscible metals
When metals are immiscible, they cannot constitute alloys. Mixing is only possible by foundry although, if these metals are frozen, they will separate again into differentiated phases or layers. He copper and the cobalt they are two immiscible metals, to cite a case.
It is possible to associate miscibility with the entropy of substances: the higher the entropy, the more miscibility. This explains why gases are generally miscible, unlike solids which are usually immiscible. There are, however, several exceptions, such as solid combinations of nickel and copper.
Continue on: Foundry