Wang Longhai, Cai Dongqing, Zhang Guilong, Ge Chunmei, Wu Zhengyan, Zhang Xin
J Nanosci Nanotechnol. 2016 Jun;16(6):5869-74. doi: 10.1166/jnn.2016.12065.
Dispersion of nanomaterials could influence their functions and suspending capacity in aqueous solution, which could further affect their applications. Therefore, improving the dispersion of nanomaterials was rather significant. Herein, to enhance the dispersion of attapulgite (ATP), a kind of naturally aggregated nanoclay, straw ash-based biochar and biosilica (BCS) with micro/nano porous structure was added to ATP suspension under ultrasonic processing to form ATP-BCS nanocomposites. This approach could effectively decrease the particle size of originally aggregated ATP through steric hindrance effect of BCS and cavitation effect of ultrasound, resulting in a significant improvement of the dispersion and suspension capacity of ATP. Moreover, the ATP-BCS, when added into pesticide, could effectively improve the adhesion of pesticide, so that the loss of pesticide could be decreased and the pollution risk of pesticide could be lowered.
纳米材料的分散性会影响其在水溶液中的功能和悬浮能力，进而影响其应用。因此，提高纳米材料的分散性具有重要意义。在此，为提高凹凸棒石（ATP）——一种天然聚集的纳米黏土——的分散性，将具有微/纳米多孔结构的秸秆灰基生物炭和生物二氧化硅（BCS）在超声处理下添加到ATP悬浮液中，形成ATP-BCS纳米复合材料。这种方法可通过BCS的空间位阻效应和超声的空化效应有效减小原始聚集的ATP的粒径，从而显著提高ATP的分散性和悬浮能力。此外，ATP-BCS添加到农药中时，可有效提高农药的附着力，从而减少农药损失并降低农药的污染风险。
