摘要
以纳米纤维素(NFC)为原料,分别以纯水和水与二甲基亚砜混合溶剂(H_(2)O-DMSO)为分散介质通过定向冷冻的方式使NFC悬浮液凝固,经冷冻干燥和化学气相沉积后得到具有超双疏性能NFC气凝胶。接触角测试分析表明:在一定浓度范围内,NFC气凝胶接触角随着NFC浓度的增加而增加;而以H_(2)O-DMSO为溶剂制备的NFC气凝胶(FNDA-Ds)较同NFC浓度下纯水溶剂制备的样品接触角明显增大,且当NFC浓度为2%(wt)时,包括水、乙二醇、甘油、蓖麻油和十六烷在内的各液体接触角均达150°以上,表明冷冻干燥过程中DMSO的存在优化了气凝胶表面的纳/微多级粗糙结构,显著提升了其疏液性能。
Nanocellulose aerogel were prepared via directional freezing with pure water or water-dimethyl sulfoxide mixture solvents(H_(2)O-DMSO)as dispersion mediumto solidify NFC suspension.After freeze-drying and chemical vapor deposition,NFC aerogels with superphobic properties were obtained.Contact Angle test analysis shows that the contact Angle of NFC aerogel increases with the increase of NFC concentration in a certain concentration range.The contact Angle of NFC aerogel(FNDA-DS)prepared by H_(2)O-DMSO was significantly higher than that prepared by pure water in the same concentration of NFC.When the concentration of NFC was 2%(wt),the contact Angle of each liquid including water,ethylene glycol,glycerol,castor oil and hexadecane all reached more than 150°.The results showed that the presence of DMSO in the freeze-drying process optimized the nano-micro multilevel rough structure of the aerogel surface and significantly improved its hydrophobic performance.
作者
冯鹤丽
孙岩
左克曼
吴伟兵
FENG He-li;SUN Yan;ZUO Ke-man;WU Wei-bing(Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources in Jiangsu Province,Nanjing Forestry University,Nanjing 210037,China)
出处
《纤维素科学与技术》
CAS
2022年第1期63-70,共8页
Journal of Cellulose Science and Technology
基金
江苏省自然科学基金(BK20171450)
国家重点研究开发项目(2017YFD0601005)
生物基材料与绿色造纸国家重点实验室基金(No.KF201804)
齐鲁工业大学、山东科学院和江苏省高等院校优先学科建设(PAPD)。
关键词
纳米纤维素
气凝胶
超双疏
定向冷冻
微/纳结构
nanocellulose
aerogel
superamphiphobic
freeze-drying
nano/micro hierarchical structure
