Molecular Porosity
Molecular porosity is the distance among atoms
(atomic nuclei) inside molecules or materials.
The Porosity of water is taken as reference unit.
Porosity has volume character and its cube root represent the lineal distance or separation between two next atomic nuclei. In water, I call fer to the value of this lineal distance between atomic nuclei of oxygen (3,1 x 10^-10 m).
In the drawing we can see the way to obtain porosity coefficients.
Hydrogen doesn't count in the number of atoms.
To obtain porosity coefficient, the first circumstance that it is necessary to keep in mind is that hydrogen atoms are normally acquired as orbital ones and therefore hydrogen doesn't count in the number of component atoms, as it happens in the water. Against, atomic weight of hydrogen is kept in mind, as we make in water.
Coefficient of Porosity.
The porosity coefficient is an important parameter to understand and to adjust the molecular structuring because this coefficient shows us the cohesion or distance among atoms inside molecules or materials. For intance, if in water the distance between two next oxygen nuclei is f (ferlength= 3,1.10^-10 m.), then in diamond the distance between two next carbon nuclei will be 0,6 f (cube root of 0,21), in rubidium 1,46 f (c. r. 3,11) etc.
--If we notice the drawing example, we see that diamond has a low coefficient 0,21 that would tell us that its atoms are very together. This coefficient would support the structuring that I give for diamond (diamond bonds) in which is shown as hexa groups formed by double bonds of electrons (benzene type) unite among them for other single bonds of covalent type also. It means that a diamond forms a single molecule whose atoms are very near each other.
--In the case of graphite whose porosity coefficient is of 0,30 we see on one hand that graphite is formed by hexa groups similar to diamond, but the union among these hexa groups is of ionic type and they don't form covalent bonds, which means that the hexa groups are more separate than in diamond.
--In the case of the fullerene coefficient 0,42, this would mean its molecules are united to each other by ionic action, but these unions not having the same easy symmetry than graphyte (D-T-D-T ...), fullerene (6D-4T) don't have the same union possibility, so, among the ionic unions of its molecules some holes exist.
<>In porosity we have to keep in mind so much the inteior molecular porosity as among molecules.
***Another utility of the Porosity coefficient is to know the quantity of atoms in any material.
( See. Atomic Quantity )