The structure formation of magnesium hydroxide in a magnetic field of varying intensity depending on the concentration of salt solution and the conditions for its deposition and heat treatment has been studied. It has been shown that the magnetic field increases the sorption capacity of samples and reduces their surface area, and that method of fast hydroxide deposition usually generates more uniporous structure of the sample. The explanation has been proposed for observed changes in structural parameters of synthesized samples.

A new method of synthesis of bi- and tri porous silica gels containing sets of pores with different diameters has been proposed, and their adsorption-structural parameters have been studied, ft has been shown that the proposed methods allow the synthesis of silica gels with wide range of pore diameters and varied porosity. The results open a new path for use of silica gel not only for sorption, but also as an inert catalyst carrier, where the porous structure sometimes is of major importance for governing the catalytic properties. New method of synthesis can significantly improve the dynamic response of porous materials, and, respectively, make the active surface more available for reacting or adsorbed molecules.

Structural parameters of silica gels synthezid by the standard methods and by the method of rapid deposition have been studied. It has been shown that the proposed method of silica gel deposition allows to obtain homogeneously porous samples, including the mesoporous samples. It has been established that silicas obtained by the proposed method have a higher absorption capasity and a more narrow pore size distribution on effective radii. The new methods of hydroxide deposition opens wide opportunites for synthesis of adsorbents and catalysts with predetermined structure.