Montmorillonite has ion exchange properties, mainly cations, such as Na+, Ca2+, K+, Mg2+, Li+, H+, Al3+, etc., and the exchange is reversible. In pH 7 medium, the cation exchange capacity was 70~140me/100g.Montmorillonite usually contains three states of water, surface free water, interlayer adsorbed water and lattice water. Montmorillonite has strong water absorption, swelling after water absorption, that is, the spacing of the lattice bottom increases, and in the high hydration state, the crystal axis C0 can reach 1.84~2.14nm. Montmorillonite can be dispersed into colloidal state in aqueous medium. Montmorillonite was lost by heating free water, and adsorbed water was removed at 100~200. At 500 DEG C, a large amount of lattice water began to escape.Montmorillonite is electronegative and has great influence on colloid properties and rheological properties. Electronegativity mainly comes from three aspects: lattice substitution and the internal compensation replacement; the lattice electrostatic charge is about 0.66 nm per unit cell; the electronegativity of breaking bond; the electronegativity of dissociation of eight surface slices.
Montmorillonite smectite (Smectite) belongs to the family of 28 face sub families, composed of two layers of the top silicon oxygen tetrahedral sheet connected with a layer of aluminum (magnesium co edge connection (eight) oxygen hydrogen and oxygen) surface plate type 2:1 containing water of crystallization structure, is one of the mineral clay minerals in the crystal structure of the strongest variation through the experiment, the results show that the diffraction slow scan for natural nano materials.
Montmorillonite (montmorillonite) also known as microcrystalline kaolinite, silicate clay mineral is a layered structure, crystal, named after its initial discovery in the French city of montmorillonite, the popular name guanyintu, the family has 11.
