| 摘要 |
Silica with has a silanol group content given by Srel = (2Q2 + Q3)/(2Q2 + Q3 + Q4). Q2, Q3 and Q4 = the numbers of Si atoms bonded to 2, 1 and 0 hydroxy groups, respectively Srel /- 2.786 x S x 10-4 + 0.2. S = the BET surface area in m2/g). More than 80% (especially more than 98%) of the protons of the silanol groups are exchangeable for deuterium. Also claimed is a process for producing silica as above, comprising generating hydrated silica monomers in an acid medium with a pH below 2. |
