Investigation of nanostructure of konjac-based water absorbents with atomic force microscopy

查看全文 作　　者：Shengrong [1]GENG;Ruotai [1]LIN;Mingli [1]CHEN;Shaoyang [2]LIU;Yifen [2]WANG 机构地区：[1]Institute for Farm Products Processing and Nuclear-Agricultural Technology,Hubei Academy of Agricultural Sciences,Wuhan 430064,China;[2]Biosystems Engineering Department,Auburn University,200 Tom E.Corley Building,Auburn,AL 36849-5417,USA 出　　处：《Frontiers of Chemical Science and Engineering》索引2009年第3卷第4期,共6页 摘　　要：Atomic force microscopy technology is gradually spreading to almost all aspects,including food science and technology,since it was first invented in 1986.In this study,this powerful instrument was applied to image nanostructures of three water absorbents-original konjac powder,konjac powder grafted with acrylic acid using^(60)Coγ-irradiation and regenerated grafted powder.Water absorption capacities and the rates of the three absorbents were also determined in this work.Original konjac powder could only absorb 60 times(w/w)of water,while 270 times for the grafted absorbent and 360 times for the regenerated absorbent.The initial water absorption rates in both tap and distilled water were high,but the rate decreased steeply as time elapsed.After 20 min,the absorbent was close to saturated status.These physical properties were in accordance with the nanostructures of these three water absorbents. 关 键 词：NANOSTRUCTURE atomic force microscopy IRRADIATION konjac glucomannan GRAFT