Atomistry » Boron » Physical properties » Colloidal Boron
Atomistry »
  Boron »
    Physical properties »
      Colloidal Boron »

Colloidal Boron

Colloidal solutions of boron may be prepared from boron obtained by the action of magnesium, sodium, or potassium on boron sesqui-oxide, by extracting the products of the reaction with hydrochloric acid and washing the residue repeatedly with water until the water acquires a decided colour. Two boron hydrosols have been obtained by the magnesium method: (i.) a relatively unstable sol, and (ii.) a comparatively stable sol. The first is dark brown in colour, and may be kept in a closed vessel for not more than three or four weeks. It is immediately coagulated by electrolytes, and rapidly oxidised by dilute nitric acid or hydrogen peroxide. It cannot be purified by dialysis. The second resembles the first in appearance, but may be kept for nine weeks and purified by dialysis. Two sols have been obtained by the potassium method; they resemble those just described. Three sols have been obtained by the sodium method, and are deep blue in colour. Two are unstable, but the third is stable and may be purified by dialysis. Boron hydrosols have a high electrical resistance; the boron particles are negatively charged.

Last articles

Zn in 9MJ5
Zn in 9HNW
Zn in 9G0L
Zn in 9FNE
Zn in 9DZN
Zn in 9E0I
Zn in 9D32
Zn in 9DAK
Zn in 8ZXC
Zn in 8ZUF
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy