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Self-Sustaining Cellulose Nanofiber Hydrogel Produced by Hydrothermal Gelation without Additives
ACS Biomaterials Science & Engineering ( IF 5.4 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsbiomaterials.8b00026 Shin Suenaga 1 , Mitsumasa Osada 1
ACS Biomaterials Science & Engineering ( IF 5.4 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsbiomaterials.8b00026 Shin Suenaga 1 , Mitsumasa Osada 1
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We prepared a self-sustaining hydrogel from 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNs) via hydrothermal treatment at 160 °C. The self-sustaining hydrogels could be obtained at less than 1 wt % TOCNs without any additives. Brownish hydrogels obtained after the hydrothermal treatment could be rendered transparent by immersing them in distilled water at 5 °C. The compressive modulus of the hydrogel increased with increasing heating time. X-ray diffraction studies reveal that the crystal structure of the internal layers of the TOCNs remained intact after the hydrothermal treatment and depigmentation. The hydrothermal treatment caused the hydrolysis of molecules, especially the glucuronate units, from the external layer of TOCN. The elimination of the glucuronate units decreased the net negative surface charge of the TOCNs, resulting in their aggregation into a three-dimensional network structure owing to the predominance of attractive forces. Such additive-free hydrogels that can be shaped into diverse forms are promising for medical applications.
中文翻译：
无添加剂水热凝胶法制备的自持纤维素纳米纤维水凝胶
我们通过在160°C的水热处理，由2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化的纤维素纳米纤维（TOCNs）制备了一种自持水凝胶。在没有任何添加剂的情况下，可以以小于1wt％的TOCNs获得自持水凝胶。通过将水热处理后获得的褐色水凝胶浸入5°C的蒸馏水中，可以使其透明。水凝胶的压缩模量随着加热时间的增加而增加。X射线衍射研究表明，经过水热处理和脱色后，TOCNs内层的晶体结构保持完整。水热处理导致分子（尤其是葡萄糖醛酸酯单元）从TOCN外层水解。葡萄糖醛酸酯单元的消除降低了TOCN的净负表面电荷，由于吸引力的存在，导致它们聚集为三维网络结构。可以成形为多种形式的这种无添加剂的水凝胶有望用于医疗应用。
更新日期：2018-03-12
中文翻译：
无添加剂水热凝胶法制备的自持纤维素纳米纤维水凝胶
我们通过在160°C的水热处理，由2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化的纤维素纳米纤维（TOCNs）制备了一种自持水凝胶。在没有任何添加剂的情况下，可以以小于1wt％的TOCNs获得自持水凝胶。通过将水热处理后获得的褐色水凝胶浸入5°C的蒸馏水中，可以使其透明。水凝胶的压缩模量随着加热时间的增加而增加。X射线衍射研究表明，经过水热处理和脱色后，TOCNs内层的晶体结构保持完整。水热处理导致分子（尤其是葡萄糖醛酸酯单元）从TOCN外层水解。葡萄糖醛酸酯单元的消除降低了TOCN的净负表面电荷，由于吸引力的存在，导致它们聚集为三维网络结构。可以成形为多种形式的这种无添加剂的水凝胶有望用于医疗应用。
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