Hydrolyzed Al(III) clusters: Speciation stability of nano-Al13
Dongsheng Wang , Shuifeng Wang , Chihpin Huang , Christopher W K. Chow
DOI:
Received July 01, 2010,Revised September 25, 2010, Accepted , Available online
Volume 23,2011,Pages 705-710
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Pure nano-Al13 and aggregates at various concentrations were prepared to examine the particle size e ect of coagulation with
inorganic polymer flocculant. The property and stability of various species formed were characterized using Infrared, 27Al-NMR,
photo correlation spectroscopy (PCS), and Ferron assay. Results showed that concentration and temperature exhibited di erent roles
on the stability of Al13. The quantity of Alb species analyzed by ferron assay in the initial aging period corresponded well with that
of Al13, which has been confirmed in a dimension range of 1–2 nm by PCS. Al13 solutions at high concentrations (0.5–2.11 mol/L)
were observed to undergo further aggregation with aging. The aggregates with a wide particle size distribution would contribute to the
disappeared/decreased Al13 basis on the 27Al-NMR spectrum, whereas a part of Al13 would still remain as Alb. At low concentrations,
Al13 solution was quite stable at normal temperature, but lost its stability quickly when heating to 90°C.
