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Pyrogenic particles

Amorphous sihca exists also ia a variety of forms that are composed of small particles, possibly aggregated. Commonly encountered products iaclude sihca sols, sihca gels, precipitated sihca, and pyrogenic sihca (9,73). These products differ ia their modes of manufacture and the way ia which the primary particles aggregate (Fig. 8). Amorphous sihcas are characterhed by small ultimate particle si2e and high specific surface area. Their surfaces may be substantially anhydrous or may contain silanol, —SiOH, groups. These sihcas are frequentiy viewed as condensation polymers of sihcic acid, Si(OH)4. [Pg.476]

Precipitated and pyrogenic silicas are widely employed in antifoams used in industry. To be effective, the silica surface must be rendered hydrophobic by reaction with an agent such as polydime thylsiloxane. The hydrophobic particles are dispersed in a carrier fluid such as mineral or silicone... [Pg.481]

See other pages where Pyrogenic particles is mentioned: [Pg.47]    [Pg.126]    [Pg.154]    [Pg.616]    [Pg.617]    [Pg.837]    [Pg.180]    [Pg.180]    [Pg.47]    [Pg.126]    [Pg.154]    [Pg.616]    [Pg.617]    [Pg.837]    [Pg.180]    [Pg.180]    [Pg.368]    [Pg.369]    [Pg.469]    [Pg.479]    [Pg.479]    [Pg.480]    [Pg.481]    [Pg.490]    [Pg.491]    [Pg.491]    [Pg.493]    [Pg.493]    [Pg.283]    [Pg.411]    [Pg.412]    [Pg.417]    [Pg.73]    [Pg.79]    [Pg.395]    [Pg.640]    [Pg.358]    [Pg.358]    [Pg.375]    [Pg.174]    [Pg.190]    [Pg.749]    [Pg.825]    [Pg.159]    [Pg.174]    [Pg.469]    [Pg.479]    [Pg.479]    [Pg.480]    [Pg.490]    [Pg.491]    [Pg.491]    [Pg.493]    [Pg.493]   
See also in sourсe #XX -- [ Pg.286 , Pg.287 , Pg.288 , Pg.289 , Pg.290 , Pg.292 , Pg.293 , Pg.294 ]



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Pyrogenic

Pyrogens

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