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Oxygen-15 labelled water (also known as 15 O-water, [O-15]-H 2 O, or H 215 O) is a radioactive variation of regular water, in which the oxygen atom has been replaced by oxygen-15 (15 O), a positron -emitting isotope. 15 O-water is used as a radioactive tracer for measuring and quantifying blood flow using positron emission tomography (PET) in ...
Liquid silicon dioxide (colloidal silica) is used as a wine and juice fining agent. Absorbent. Colloidal silica is used in concrete densifiers and polished concrete. In manufacturing Quantum dots, small semi-conductors used in various scientific research settings. Reduced porosity and increased protection from alkali-silica reaction (ASR).
Silica fume is an ultrafine material with spherical particles less than 1 μm in diameter, the average being about 0.15 μm. This makes it approximately 100 times smaller than the average cement particle. [4] The bulk density of silica fume depends on the degree of densification in the silo and varies from 130 (undensified) to 600 kg/m 3.
Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants. Silica is an amorphous metalloid oxide formed by complex inorganic polymerization processes.
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Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density and high ...
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Mesoporous silica is a form of silica that is characterised by its mesoporous structure, that is, having pores that range from 2 nm to 50 nm in diameter. According to IUPAC 's terminology, mesoporosity sits between microporous (<2 nm) and macroporous (>50 nm).