Silicates, Aluminosilicates and Biogenic Silica
نویسندگان
چکیده
منابع مشابه
Mimicking Biogenic Silica Nanostructures Formation
Biomineralization processes are now fully recognized as inspiring systems for the design of new materials. In the case of silica, the formation of diatom shell or sponge spicule has attracted much attention in the last decade since it could provide key information to elaborate new hierarchically structured materials and nanodevices. In these two examples, the mineral phase is thought to be form...
متن کاملRiverine contribution of biogenic silica to the oceanic silica budget
Biological uptake of dissolved silicate (DSi) and formation of biogenic silica (BSi) during diatom growth modifies the form of Si carried from the continents to the world ocean. Significant concentrations of BSi, averaging 28.0 pmol L-l, are found in all sizes of rivers. The global contribution of BSi carried by rivers was estimated as 1.05 ? 0.20 Tmol Si year’. Combined with the global mean ri...
متن کاملCrystal chemistry of silica - rich barium silicates II : Electron microscopy of barium silicates containing multiple chains
The phases containing multiple chains in the series Ba",+1[Si2mOsm+d those with triple (m = 3), quadruple (m = 4) and quintuple (m = 5) tetrahedral chains were investigated by high resolution transmission electron microscopy. The resulting images could be correlated with the structures. Variations of the chain multiplicity (m) within single crystals were observed as well as faults in the packin...
متن کاملMeasured and predicted fluxes of biogenic silica in Lake Michigan’
Diatom production in the offshore waters of Lake Michigan is limited by silica supplies in late summer and can be predicted from the seasonal disappearance of silica from the trophogenic zone. Biogenic silica fluxes obtained from sediment trap collections were compared with fluxes predicted from the silica disappearance model. Measured and predicted fluxes were in good agreement for offshore st...
متن کاملEvidence for reduced biogenic silica dissolution rates in diatom aggregates
Because aggregated diatoms sink rapidly through the water column, leaving little time for dissolution, aggregation influences the balance between recycling of biogenic silica (bSiO2) and its sedimentation and preservation at the seafloor. Additionally, aggregation may directly impact dissolution rates of opal. Laboratory experiments were conducted to investigate the influence of aggregation on ...
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ژورنال
عنوان ژورنال: CHIMIA International Journal for Chemistry
سال: 2020
ISSN: 0009-4293
DOI: 10.2533/chimia.2020.1022