Yang Guihua, Ma Guangrui, He Ming, Ji Xingxiang, Li Weidong, Youn Hye Jung, Lee Hak Lae, Chen Jiachuan
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2021 Feb 9;11(2):439. doi: 10.3390/nano11020439.
Cellulose nanofibrils (CNFs) were exposed to the same levels of potassium chloride (KCl) and sodium chloride (NaCl) before being subjected to spray drying. The effect of NaCl and KCl on the size of atomized droplets and the hydrogen bond retardation between CNFs was investigated by characterizing product morphology, particle size distribution, dispersion stability in aqueous system, and surface chemistry. The results showed that the CNF suspensions treated with KCl could be atomized into smaller droplets during spray drying, and then CNF powder with smaller sizes could be obtained. As the agglomeration was less, and the CNF with KCl addition had good dispersion stability after redispersion compared with CNF treated by NaCl. Therefore, KCl treatment was an effective method to reduce the agglomeration of CNF during spray drying.
在进行喷雾干燥之前，将纤维素纳米纤维（CNFs）暴露于相同水平的氯化钾（KCl）和氯化钠（NaCl）中。通过表征产品形态、粒度分布、在水体系中的分散稳定性和表面化学性质，研究了NaCl和KCl对雾化液滴尺寸以及CNFs之间氢键阻滞的影响。结果表明，用KCl处理的CNF悬浮液在喷雾干燥过程中可雾化成更小的液滴，进而可获得尺寸更小的CNF粉末。由于团聚较少，与用NaCl处理的CNF相比，添加KCl的CNF在重新分散后具有良好的分散稳定性。因此，KCl处理是减少喷雾干燥过程中CNF团聚的有效方法。
