Pure
amorphous silica was successfully extracted at a 99.1% yield from sugarcane waste ash generated by a two-stage heating process followed by precipitation by acidification of the sodium silicate solution, so obtained.
Jin et al., "Size-dependent cytotoxicity of
amorphous silica nanoparticles in human hepatoma HepG2 cells," Toxicology in Vitro, vol.
Krantz, Bonn, Germany), and two types of
amorphous silica: silica gel (Merck, Kenilworth, NJ, USA) and bio-opal (
amorphous silica of biogenic origin) obtained from Equisetum fluviatile (water horsetail) following the procedure of Bartoli and Wilding (1980).
It is worth mentioning that
amorphous silica was also extracted by other researchers [2, 5, 6, 9, 13] from the RHA by using other methods.
The 2[theta] value of the present XRD spectrum result was compared and confirmed by using standard JCPDS file and the obtained XRD result is matched with JCPDS file (79-1711); hence, XRD results confirmed that the synthesized material is
amorphous silica particles.
The
amorphous silica in RH can be easily transformed to the silicate and dissolved during the alkaline pulping process, which causes the loss of silica and difficulty of alkaline recycle.
Colloidal silica is a suspension of fine and spherical
amorphous silica particles (usually) in aqueous phase.
Fillers include calcium carbonates, kaolin clays, alumina trihydrates, wood and fiber flocks, wood flours, micas, magnesium carbonates, and precipitated
amorphous silica.
The combustion temperature of 800[degrees]C was used in this study to prevent the crystallization of
amorphous silica contained in the ash [10].
The silicon substrates being used are not limited to: polydimethylsiloxane,
amorphous silica, petroleum distillates, methyltriacetoxy silane, or ethyltriacetoxy silane through which sensors may be embedded into to enable the detection platform.
The example consists of 1 wt% single-wall carbon nanotubes, 32 wt% calcium carbonate, 5 wt% iron powder, 15 wt% epoxy resin, 1 wt%
amorphous silica, 8 wt% nonfibrous talc, 0.5 wt% aromatic hydrocarbons, 17.5 wt% barium sulfate, 2.5 wt% alkyl phenol, 15 wt% mercaptan terminated polymer, and 2.5 wt% [2,4,6 dimethylamino methyl]phenol 1.
