Suppressed Reactivity of AlN Powder in Water at 5°C |
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| Authors: | Andra? Kocjan Ale? Dakskobler Bojan Budi? Toma? Kosma? |
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| Affiliation: | 1. Department of Materials and Environmental Chemistry, Stockholm University, , Stockholm, Sweden;2. Berzelii Center EXSELENT on Porous Materials, Stockholm University, , S‐10691 Stockholm, Sweden;3. Engineering Ceramics Department, Jo?ef Stefan Institute, , Ljubljana, Slovenia;4. Center of Excellence Namaste, , SI‐1000 Ljubljana, Slovenia;5. Laboratory for Analytical Chemistry, National Institute of Chemistry, , Ljubljana, Slovenia |
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| Abstract: | The hydrolysis behavior of AlN powder suspensions (5–25 wt%) at 5°C has been investigated to explore the impact of low temperatures on the hydrolysis behavior. Throughout the 312‐h long experiment, the pH value of the suspensions was below 9, where the hydrolysis remained in the induction period and was eventually suppressed due to the formation of a few‐nanometers‐thick film of amorphous aluminum hydroxide gel around the AlN particles, acting as a passivation layer. Moreover, the aqueous part of the suspension possessed a remarkably high value of dissolved Al(III)]aq, being an order of magnitude higher at a given pH value than the aqueous AlCl3 solution. |
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