中国造纸2026，Vol.45Issue(1)：1-11,11.DOI:10.11980/j.issn.0254-508X.2026.01.001
双层定向/随机冷冻对纤维素基气凝胶孔结构及吸水性能的调控
Regulation of Pore Structure and Water Absorption in Cellulose-based Aerogels via a Combined Directional and Random Freezing Strategy
摘要
Abstract
This study utilized carboxylated nanocellulose,polyvinyl alcohol,and whey protein isolate as matrix materials.By regulating freezing tem-perature and orientation,a bilayer directional/random frozen aerogel(DF/RF-20)was developed,combining-20℃random freezing and-196℃direc-tional freezing.It was compared with aerogels prepared under-20℃slow random freezing(RF-20),-196℃fast random freezing(RF-196),and-196℃directional freezing(DF),to investigate the effects of freezing methods on the microstructure,density,porosity,mechanical properties,and wa-ter absorption performance of the aerogels.The results showed that RF-20 exhibited large pore sizes with a dispersed pore distribution and a water ab-sorption capacity of 42.21 g/g,but poor compressive strength(44.37 kPa).DF showed ordered and dense through-pores formed from bottom to top,with better compressive performance(73.39 kPa)but weaker water absorption ability(35.80 g/g).In comparison,DF/RF-20 combined high compressive strength(73.90 kPa),excellent wet-state compressive strength(25.75 kPa at 500%water content),and good water absorption capacity(43.30 g/g).Its surface water absorption rate was approximately 15 times higher than that of RF-20.After drying at 25℃for 12 h,it demonstrated good water retention performance(water retention rate of 86.76%)and maintained stable liquid absorption capability under different pH and ionic environments.关键词
气凝胶/随机冷冻/定向冷冻/孔结构/吸水性能Key words
aerogels/random freezing/directional freezing/pore structure/water absorption properties分类
轻工纺织引用本文复制引用
段媛元,李雨函,彭旭阳,姜俊志,阎瑞香..双层定向/随机冷冻对纤维素基气凝胶孔结构及吸水性能的调控[J].中国造纸,2026,45(1):1-11,11.基金项目
国家重点研发计划(2022YFD1600704) （2022YFD1600704）
学生创新培训计划(202510057037). （202510057037）
