Abstract:
Investigations of the cluster-coagulation model for some inorganic substances and
mixtures of sodium thiosulfate with salts of elements (VI) of A, B groups have been
carried out. The doping of sodium thiosulfate pentahydrate with sodium selenate,
tellurate, molybdate and tungstate has been carried out. The thermodynamic
parameters of associate formation processes between sodium thiosulfate and salts
formed from oxygen-containing acids of selenium, tellurium, molybdenum and
tungsten have been calculated. The amount of heat introduced by the modifier
(selenate, tellurate, molybdate and tungstate of sodium) into the total heataccumulating effect of the mixture Na2S2O3∙5H2O – Na2XO4 (X – Se, Te, Mo or
W) mixture has been calculated. The number of n-particle clusters and the diameter
of clusters that are formed in the melt of the Na2S2O3∙5H2O – Na2XO4 mixture
have been calculated. It is shown that special effects of systems based on mixtures
consisting from sodium thiosulfate pentahydrate and salts of selenium, telluric,
molybdenum, tungsten acids could be explained by more excessive tendency of
these structures to the hydrate formation, associative stability and polymerization
for the reason that rare elements’ ions in anionic form stabilize associates of sodium
thiosulfate with water molecules that leads to growth the heat storage capacity.
The scientific and practical significance of this research refers to the probability
of prediction physicochemical properties of modified heat-accumulating materials
based on the cluster-coagulation model.
