Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 5, pp. 751−755.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © B.N. Dudkin, O.A. Vasyutin, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 5, pp. 721−725.
INORGANIC SYNTHESIS AND INDUSTRIAL
Synthesis of Magnesium Silicate by Heat Treatment
of Sols and Mechanical Activation
of Solid Components
B. N. Dudkin and O. A. Vasyutin
Institute of Chemistry, Komi Scientiﬁ c Center, Ural Division, Russian Academy of Sciences, Syktyvkar,
Komi Republic, Russia
Received July 9, 2010
Abstract—A layered magnesium silicate, an analog to natural talc, was synthesized by mechanical treatment of
a mixture of magnesium hydroxide and hydrated silicic acid powders, as well as by heat treatment of aqueous
dispersions containing magnesium hydroxide particles and silica sols prepared from different precursors.
Naturally occurring layered silicates are represented
by a mineral group that includes talcs, pyrophyllites,
micas, montmorillonites, kaolinites, and closely related
clay minerals. The structure of layered silicates is based
on hexagonal networks of interconnected SiO
All layered silicates exist as pseudohexagonal platy-
shaped particles .
Layered silicates ﬁ nd industrial applications as cata-
lysts, adsorbents, and ion-exchangers and also are used in
semiconductor manufacturing. Steadily growing demand
for these mineral resources has motivated intense research
efforts seeking to interrelate the composition, structure,
and properties of the particle surface, based on the use of
model colloid and chemical systems. Those studies have
culminated in the development of hydrothermal synthesis
procedures for layered silicates of different types and
Recent 20 years have witnessed an active development
of a new application sphere for layered silicates, synthesis
of organic-inorganic hybrid materials. Silicate–polymer
hybrids are typically synthesized from layered silicates
prepared by the sol-gel  or mechanochemical route.
In the former case the synthesis procedure involves heat
treatment , and in the latter, mechanical activation of
the precursors .
Heat treatment or mechanical activation of layered
silicates in the presence of organic macromolecules leads
either to an organic-inorganic hybrid or, in the case of
a sol-gel conversion, to a gel matrix incorporating the
organic molecules. Such materials can be prepared by
the sol-gel process solely [9, 10]. Synthesis of layered
silicates from mechanically activated precursors follows
a speciﬁ c route which has its own peculiarities .
Here, we synthesized a layered magnesium silicate,
an analog to natural talc, by heat treatment of aqueous
dispersions and by mechanical treatment of a powder
precursor mixture. Also, we determined the phase com-
position of the products obtained and examined how it
changes during the aging process.
Synthesis of a layered magnesium silicate by the
heat treatment route in the liquid phase recycle mode
was carried out in round-bottom ﬂ asks ﬁ tted with reﬂ ux
condensers. In one experiment the ﬂ ask was charged with
a hydrated silicic acid (SiO
O) powder, and in the
second and third experiments, with silica sols, of which
one (sol I) was prepared by the ion-exchange route from
a dilute solution of sodium metasilicate and KU-2 cation