1. Introduction
Recently, silica with predetermined properties (e.g. spherical shape of particles, high adsorption activity) has been researched widely [1–8]. The spherical silica powders could potentially have a broad application, particularly in processing of plastics (production of nanocomposites), adsorptive processes and catalysis [1–2].
Stöber method is the most popular and widely used method to pro-duce silica with spherical shape of particles;chemical reactions in this method are conducted in broadly understood emulsion systems, and the precursors are mainly the expensive tetraalkoxysilanes (TEOS) [3–4]. In order to reduce the cost of precursor, Teofil Jesionowski [1,6,8] successfully prepared silica powders with particles of spherical shape using sodium metasilicate as cheaper precursors and hydrochloric acid via the emulsion technique, and the primary particles had a low tendency to agglomerate.
1. IntroductionRecently, silica with predetermined properties (e.g. spherical shape of particles, high adsorption activity) has been researched widely [1–8]. The spherical silica powders could potentially have a broad application, particularly in processing of plastics (production of nanocomposites), adsorptive processes and catalysis [1–2].Stöber method is the most popular and widely used method to pro-duce silica with spherical shape of particles;chemical reactions in this method are conducted in broadly understood emulsion systems, and the precursors are mainly the expensive tetraalkoxysilanes (TEOS) [3–4]. In order to reduce the cost of precursor, Teofil Jesionowski [1,6,8] successfully prepared silica powders with particles of spherical shape using sodium metasilicate as cheaper precursors and hydrochloric acid via the emulsion technique, and the primary particles had a low tendency to agglomerate.
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