基于定向冷冻超双疏NFC气凝胶的构筑  

Construction of Superamphiphobic Nanocellulose Aerogel Based on Directional Freezing

作　　者：冯鹤丽 孙岩 左克曼 吴伟兵[1] 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)

机构地区：[1]南京林业大学江苏省林业资源高效加工利用协同创新中心轻工与食品学院,江苏南京210037

出　　处：《纤维素科学与技术》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)。

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.

关 键 词：纳米纤维素 气凝胶 超双疏 定向冷冻 微/纳结构 

分 类 号：TS721[轻工技术与工程—制浆造纸工程]