Aluminium oxide

*1: For grinding the sample, we had to add 15ml of water (H2O).

*2: For avoiding overpressure by grinding in suspension, we grinded in steps of 3 minutes, followed by 8 minutes of programmed pausing time. This counts for all further grinding trials too. If the outside temperature of the bowl will become too high (>70°C), grinding/ pausing times should be readjusted.

*3: After 60min, the balls can be changed to 0,1mm diameter balls (see trial 1b).

*1: After 1 hour with 0,5mm balls, particles are to fine for further grinding success with 0,5mm balls. Therefore, we had to changed the balls to 0,1mm.

*2: To maintain an oil-like viscosity, we had to add 25ml of water additionally. Totally, 40ml of water have been added to the sample.

*3: After a grinding time of totally 5 hours, 50% (d50) of the sample use to show a diameter of 50nm. For achieving a better fineness, a longer grinding time should still be possible.

*4: See our particle size distribution after 5 hours of grinding, measured with our ANALYSETTE 22 NanoTec plus, meas. no. 31613 on separate page.