Mechanochemical Treatment of Kaolinite

The Effect of Quartz Content on the Mechanochemical Activation of Kaolinite

“…(According to our previous experience (9,12), the agglomeration section of this sample series requires a prolonged milling time to occur.) Figure 2 shows the XRD profiles of the original and the mechanically treated (for 4 h) mixtures.…”

“…Some researchers (6)(7)(8) suggested that OH groups were displaced irreversibly during milling. The structural changes of kaolinite-especially with respect to its hydroxyl groups-was mainly investigated by means of infrared spectroscopy (5)(6)(7)(8)12). Kaolinite hydroxyl groups have four infrared stretching bands centered on 3695, 3670, 3650 (ν 1 , ν 2 , ν 3 ), and 3620 cm −1 (ν 4 ) (13)(14)(15)(16)(17).…”

Hallmarks of mechanochemistry: from nanoparticles to technology

“…652 The kaolinite (Al 2 (Si 2 O 5 )(OH) 4 ) surface hydroxyl groups lost during milling were replaced with coordinated and adsorbed water on the surface of the octahedral sheet. 660 Hydrogen release during dry milling of kaolinite was reported by Kameda et al 663 H 2 is formed by the reaction between surface water molecules and mechanoradicals created by the rupture of Si-O or Al-O-Si bonds. 663,664 Carbonation of Ca(OH) 2 is facilitated by water which may be present as humidity or as a consequence of water condensation during mechanical activation.…”

Highly effective delamination of kaolinite and emergence of a novel nanoclub-like crystal

“…At the same time, the X-ray diffraction peaks of curve (C) are broadened obviously, which indicates that the material has had its long-range structure destroyed with an increase of the mean lattice distortion and is not necessarily the consequence of the reduction of the particle size [15] . However, kaolinite particle size obviously has been reduced with a higher specific surface area 52.29 m 2 /g according to BET results.…”