Along with the Cl− ion, [C16mim]+ ion will also be aligned and arrayed along the BiOCl layer driven by the Coulomb coupling force. It is reasonable to deduce that [C16mim]Cl, which is considered as a supramolecular solvent involved ordered structure, is selectively adsorbed on the (001) plane of BiOCl to effectively inhibit crystalline growth in the [001] direction. Therefore, the growth of BiOCl crystals are inhibited along the c-axis to form ultrathin BiOCl nanoflakes. Hereafter, Huang and co-workers reported a facile, one-pot approach to the uniformBiOBr hollow microspheres in the ionic liquid precursor 1-hexadecyl-3-methylimidazolium bromide ([C16mim]Br).66. The possible formation mechanism is proposed in Fig. 5. Due to the limited miscibility of the ionic liquid precursor ([C16mim]Br) and co-solvent 2-methoxyethanol, micronized ionic liquid emulsions are formed under vigorous stirring, which are surrounded by 2-methoxyethanol containing Bi3+ ions.
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