Abstract
The reactivity of nano silica (SiO 2) with calcium hydroxide (Ca(OH) 2) was evaluated and characterized in this study. Ca(OH) 2 activated nano SiO 2 takes place through an exothermic process, which is mainly attributed to the breakdown of Si-O-Si bonds. Ca 2+ offsets the charge imbalance and bonds to Si-OH and Si-O - giving rise to calcium silicate hydrate (CSH) gel. Care has to be taken that the reactivity of nano SiO 2 with Ca(OH) 2 significantly depends on the Q 3 percentage in nano SiO 2. Q 3 percentages significantly influence the reaction kinetic of nano SiO 2. The higher Q 3 percentage results in a higher reaction degree of nano SiO 2 with Ca(OH) 2 and shorter setting times of the pastes. The higher Q 3 percentage results in a lower total reaction heat of nano SiO 2 with Ca(OH) 2. It is suggested that the Q 3 percentages of nano SiO 2 should be in excess of 30% to keep the satisfactory setting properties of the pastes for the application requirements of bone cement.
| Original language | English |
|---|---|
| Pages (from-to) | 239-246 |
| Number of pages | 8 |
| Journal | Journal of Biomedical Materials Research - Part B Applied Biomaterials |
| Volume | 99 B |
| Issue number | 2 |
| DOIs | |
| State | Published - Nov 2011 |
Keywords
- Si MAS NMR
- bone cement
- nano SiO
- reactivity