Highly absorbent cellulose nanofibrils aerogels prepared by supercritical drying

编号 020022102

推送时间 20200113

研究领域 林产化工 

年份 2020 

类型 期刊 

语种 英语

标题 Highly absorbent cellulose nanofibrils aerogels prepared by supercritical drying

来源期刊 Carbohydrate Polymers

期 第221期

发表时间 20191104

关键词 Cellulose nanofibrils;  Aerogels;  Cryogels;  Supercritical drying;  Water uptake; 

摘要 In this paper, strictly speaking aerogels of cellulose nanofibrils (CNFs) and TEMPO-oxidized CNFs (TO-CNFs) were obtained from an optimized supercritical drying processes and cryogels were prepared after freeze-drying. The cryogels and aerogels were characterized and the influence of the preparation process on the resulting properties was studied. Significant differences were observed in the micro- and nanoscale organization of the porous structures. In addition, the specific surface areas measured varied from 25 to 160?m2?g?1 for CNF materials, depending on the preparation process. Very high specific surface areas up to 482?m2?g?1 among the highest reported for pure cellulose nanofibrils porous materials were achieved for TO-CNF aerogels. Finally, in order to evaluate their aptitudes for wound dressings applications, the capillary water uptake capacities were assessed on skin mimicking layers. From this study, it was revealed that TO-CNF aerogels can absorb almost 120 times their own weight of water.

服务人员 尚玮姣

PDF文件 浏览全文