Critical impact of nanocellulose on the synthesis of porous cellulose monolith with oriented microchannels:Structure control,mechanics,mass transport  

作　　者：Rui Tang Zheng-Ze Pan Minghao Liu Mao Ohwada Hirotomo Nishihara 

机构地区：[1]Advanced Institute for Materials Research(WPI-AIMR),Tohoku University,2-1-1 Katahira,Aoba-ku,Sendai 980-8577,Japan [2]Institute of Multidisciplinary Research for Advanced Materials,Tohoku University,2-1-1 Katahira,Aoba-ku,Sendai 980-8577,Japan

出　　处：《Nano Research》2023年第5期8018-8024,共7页纳米研究（英文版）

基　　金：JSPS KAKENHI(No.22K18047);JST SICORP(No.JPMJSC2112);the New Energy and Industrial Technology Development Organization(NEDO)(No.JPNP20004)。

摘　　要：Nanocellulose harvested from biomass has attractive properties that have promoted research on its practical applications.Herein,we investigated nanocellulose-based porous monoliths with oriented microchannels that can be fabricated via a unidirectional freezing method.In this method,water-dispersed cellulose nanofibers(CNFs)were immersed into a cold source at a controlled speed,followed by subsequent freeze-drying.The structure of porous cellulose monoliths mainly depends on two factors:the freezing conditions and properties of the dispersed CNFs.The former has been investigated previously.However,the effects of the latter remain unclear.In this study,CNF suspensions prepared by 2,2,6,6-tetramethylpiperidine-1-oxylmediated oxidation cellulose nanofibers(TOCNs)with different aspect ratios and concentrations were used.The effects of these variables on the resulting structure,including the pore shape,size,wall thickness,were examined.Based on the results,the impact of TOCNs on the structure of porous cellulose monoliths was investigated.Our findings suggested that depending on their structure,the porous cellulose monoliths exhibit different mechanical strengths and mass transport properties.In particular,porous cellulose monoliths synthesized from 5.1 wt.%short TOCNs exhibited a low density(55.9 mg∙cm^(−3)),high mechanical strength(8687 kPa),fast mass transport.

关 键 词：NANOCELLULOSE cellulose nanofibers(CNFs) unidirectional freezing method 2 2 6 6-tetramethylpiperidine-1-oxyl-mediated oxidized cellulose nanofibers(TOCNs) porous cellulose monoliths 

分 类 号：O65[理学—分析化学]