Synthesis and conservation of cellulose nanocrystals.,Carbohydrate Polymers

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Synthesis and conservation of cellulose nanocrystals.
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2020-03-25 , DOI: 10.1016/j.carbpol.2020.116187
Luciana Di Giorgio ₁ , Lucía Martín ₁ , Pablo R Salgado ₁ , Adriana N Mauri ₁

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This work deals with the preparation of cellulose nanocrystals (CNC) from microcrystalline cellulose by acid hydrolysis, discusses how their characteristics varied according to the drying technique used for their conservation and analyzes their re-dispersion in water. A stable water dispersion of "rod" or "needle" type CNC (≈5 nm of diameter, 276 nm of length and 41 mV of Z potencial) was initially prepared and then dried by lyophilization and spray. Thus powders with similar cristalinity but different morphology were obtained, while CNC seemed to aggregate in such an extent that hindered their re-dispersion in water. Only lyophilized CNC could be re-dispersed in water and maintained stable in dispersion for at least 24 h, when working with concentrations of CNC higher than a certain minimum value (3 %) and after submitting them to intense ultrasound treatments. The tested time achieved should be enough to allow their subsequent use in several applications.

中文翻译：

纤维素纳米晶体的合成与保存。

这项工作涉及通过酸水解由微晶纤维素制备纤维素纳米晶体（CNC），讨论其特性如何根据用于保存它们的干燥技术而变化以及分析其在水中的再分散。首先制备稳定的“棒”或“针”型CNC水分散液（直径约5 nm，长度276 nm和Z电位41 mV），然后通过冻干和喷雾干燥。因此，获得了具有相似的曲折度但形态不同的粉末，而CNC似乎聚集到一定程度，从而阻碍了它们在水中的再分散。只有冻干的CNC才能重新分散在水中，并在至少24小时内保持稳定的分散状态，当使用浓度高于某个最小值（3％）的CNC并在对其进行强力超声治疗后。经过测试的时间应足以允许它们随后在多种应用中使用。

更新日期：2020-03-26

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