Electrokinetic Characteristics of Bismuth-Containing Materials Based on Porous Glasses
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ectrokinetic Characteristics of Bismuth-Containing Materials Based on Porous Glasses A. S. Kuznetsovaa, b, *, L. E. Ermakovaa, I. N. Anfimovab, and T. V. Antropovab aSt.
bGrebenshchikov
Petersburg State University, St. Petersburg, 199034 Russia Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034 Russia *e-mail: [email protected]
Received December 23, 2019; revised January 17, 2020; accepted February 5, 2020
Abstract—Bismuth-containing composite materials based on high-silica porous glasses (PGs) of various types are prepared. Their structural parameters and electrokinetic potential in 10–2 М KNO3 solutions in the pH range 1.5–8.5 are studied. The results are compared with the analogous properties of matrices not modified with bismuth oxide, as well as the pH dependence of the zeta-potential for SiO2 particles and the sols of synthesized and industrial bismuth(III) oxide. It is determined that modification of larger-pore particles not containing secondary silica with bismuth(III) oxide results in the deviation of the form of the ζ–рН dependences from those intrinsic for high-silica PG and SiO2 particles. Keywords: bismuth-containing materials, porous glass, quartz-like glass, electrokinetic potential DOI: 10.1134/S1087659620030086
INTRODUCTION High-silica nanoporous glasses are the products of through chemical etching of two-phase alkali-borosilicate glasses; they have comprehensively investigated and are finding an increasing number fields of application [1, 2]. Due to the presence of controlled structural parameters of nanosized pores and high surface reactivity, thermal and chemical stability, relatively low cost, and other characteristics, vitreous materials with the developed pore structure are extensively used as matrices for the preparation of nanostructured composition materials with various functional characteristics caused by the characteristics of the incorporated dopant. Methods for the preparation of such composites based on porous glasses (PGs) modified with alumina and titania [3], gallium nanoparticles [4], haematite (α-Fe2O3) [5], tin and zinc oxides and sulfides [6–8], silver halides [9, 10], and various ferroelectrics [11–13], including PG containing magnetite (Fe3O4) [14, 15], are known. The use of PGs for the preparation of new bismuth-containing composition materials (BCMs) possessing luminescence in the broad spectral range from the visible to the IR range is of particular interest, which makes them promising for use in fiber-optic technologies [16, 17]. Impregnation of PG matrices with bismuth nitrate Bi(NO3)3 from an aqueous salt solution with the subsequent special heat treatment of the impregnated matrices for the formation of bismuth active centers (BACs) is fundamental for the prepara-
tion of such materials [18]. The advantage of this approach lies in the fact that PG is a promising medium, in which the chemical equilibrium of luminescence centers in nanostructures can be effectively controlled. Information on the relationship of the structure a
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