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Isobe, Noriyuki,Komamiya, Takehiro,Kimura, Satoshi,Kim, Ung-Jin,Wada, Masahisa Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.117 No.-
<P><B>Abstract</B></P> <P>Cellulose hydrogel from aqueous solution of lithium bromide demonstrated excellent tunability of mechanical property and shape. A series of compression tests showed that cellulose hydrogel covered a wide range of mechanical property, where the compressive Young's modulus was controllable from 30 kPa to 1.3 MPa by changing the initial concentration of cellulose solution. Meanwhile, the diameter of the building block of gel, namely nano-fibrous cellulose, was constant at 15–20 nm irrelevant of the initial concentration of cellulose solution. Moreover, thanks to the biocompatibility of cellulose, the cultivation of cartilage tissue was successful in the micro-porous sponge-like cellulose hydrogel prepared by salt-leaching process. These findings show that this environmentally-benign versatile gel offers a new substrate for the biomaterial-based nanomaterial in biomedical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cellulose hydrogel with various shapes from rigid cylinder to soft sponge is prepared. </LI> <LI> Mechanical property of hydrogel is controllable by the initial input of cellulose. </LI> <LI> Compressive modulus is classed in the stiffest porous material. </LI> <LI> Nano-fibrous network structure is a building block of cellulose hydrogel. </LI> <LI> Biocompatibility is evidenced by successful cultivation of tissue inside soft gel. </LI> </UL> </P>
Poroelasticity of cellulose hydrogel
Isobe, Noriyuki,Kimura, Satoshi,Wada, Masahisa,Deguchi, Shigeru Elsevier 2018 Journal of the Taiwan Institute of Chemical Engine Vol.92 No.-
<P><B>Abstract</B></P> <P>The poroelasticity of cellulose hydrogels was studied by a series of compression tests. The stiffness of the cellulose hydrogel was found to be independent on the crystallinity of a skeletal gel matrix, suggesting that the poroelasticity made a significant contribution to mechanical properties of the hydrogel. Indeed, typical poroelastic responses were observed when the cellulose hydrogels were subjected to the compression tests with varied compression strain rates (i.e. softness upon slow compression but stiffness upon fast compression). The fluid mechanics theory showed that sub-micrometer-scale morphological difference of the gel matrix, which was observable by scanning electron microscopy, affected the flow behavior of water inside porous structure, leading to the increased stiffness upon fast compression.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Stiffness of cellulose hydrogel is independent on crystallinity of skeletal matrix. </LI> <LI> Poroelasticity of cellulose hydrogel stands out upon fast compression. </LI> <LI> Sub-micrometer-scale morphology generates poroelasticity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>