Preparation of Self-supporting Bagasse Cellulose Nanofibrils Hydrogels Induced by Zinc Ions.
Preparation of Self-supporting Bagasse Cellulose Nanofibrils Hydrogels Induced by Zinc Ions.
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锌离子诱导自支撑甘蔗渣纤维素纳米原纤维水凝胶的制备
DOI：
10.3390/nano8100800
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发表时间：
2018-10-08
期刊：
影响因子：
--
通讯作者：
Wu M
中科院分区：
文献类型：
--
作者：
Lu P;Liu R;Liu X;Wu M
纤维素水凝胶通常是通过直接纤维素溶解方法由天然纤维素制备的，该方法通常涉及繁琐的过程和溶剂回收问题。通过羧酸盐基团和 Zn2+ 之间的强交联引发 TEMPO 氧化甘蔗渣纤维素纳米纤丝 (CNF) 的凝胶化，制备了自支撑纤维素水凝胶。采用TEMPO工艺在CNF表面生成带负电荷的羧酸根基团，以提供与Zn2+的高结合能力。制备并表征了三种不同羧酸盐含量的 TEMPO 氧化 CNF。 TEM和AFM显微镜表明CNF的尺寸被细化，获得了宽5-10 nm、长200-500 nm、羧酸盐含量0.73-1.29 mmol/g的羧化纤维素纳米原纤维（TOCNF）。水凝胶的最终结构和抗压强度主要受原纤维间Zn2+-羧酸盐相互作用的影响，遵循TOCNF浓度>羧酸盐基团含量>锌离子浓度的顺序。开发了一种二氧化碳敏感的自支撑纤维素水凝胶，作为智能食品包装应用中食品腐败的比色指示剂。
Cellulose hydrogels are often prepared from native cellulose through a direct cellulose dissolution approach that often involves tedious process and solvent recovery problems. A self-supporting cellulose hydrogel was prepared by gelation of the TEMPO-oxidized bagasse cellulose nanofibrils (CNF) triggered by strong crosslinking between carboxylate groups and Zn2+. TEMPO process was used to generate negatively charged carboxylate groups on CNF surface to provide a high binding capability to Zn2+. Three TEMPO-oxidized CNFs of different carboxylate contents were prepared and characterized. TEM and AFM microscopes suggested that the sizes of CNFs were fined down and carboxylated cellulose nanofibrils (TOCNFs) of 5–10 nm wide, 200–500 nm long, and carboxylate contents 0.73–1.29 mmol/g were obtained. The final structures and compressive strength of hydrogels were primarily influenced by interfibril Zn2+-carboxylate interactions, following the order of TOCNFs concentration > content of carboxylate groups > concentration of zinc ions. A CO2 sensitive self-supporting cellulose hydrogel was developed as a colorimetric indicator of food spoilage for intelligent food packaging applications.
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DOI：
10.3390/nano8090640
发表时间：
2018-08-21
期刊：
Nanomaterials (Basel, Switzerland)
影响因子：
--
作者：
Filipova I;Fridrihsone V;Cabulis U;Berzins A
通讯作者：
Berzins A
DOI：
10.3390/nano8070550
发表时间：
2018-07-20
期刊：
Nanomaterials (Basel, Switzerland)
影响因子：
--
作者：
Basu A;Strømme M;Ferraz N
通讯作者：
Ferraz N
影响因子：
6.1
作者：
Rukchon, Chompoonoot;Nopwinyuwong, Atchareeya;Suppakul, Panuwat
通讯作者：
Suppakul, Panuwat
影响因子：
4.6
作者：
Hossen, Muhammad R.;Dadoo, Nayereh;Mason, Michael D.
通讯作者：
Mason, Michael D.
具有抗菌活性的生物相容性纤维素基超吸收性水凝胶
影响因子：
11.2
作者：
Peng, Na;Wang, Yanfeng;Chang, Chunyu
通讯作者：
Chang, Chunyu