LGP2 Laboratory of Pulp and Paper Science, 461 Rue de la Papeterie, 38402 Saint-Martin d'Hères Cedex 9, France.
Biomacromolecules. 2012 Dec 10;13(12):4118-25. doi: 10.1021/bm301378n. Epub 2012 Nov 9.
The present study reports for the first time a method to obtain water redispersible dried NFC using freeze-drying. No chemical surface modification was required to get this kind of product. Salt addition (sodium chloride: NaCl) strategy has been selected to block and then to regenerate hydrogen bonds during the drying and the redispersion steps, respectively. Several samples were produced at different pH (i.e., 4, 6, 8, and 10). All the redispersed NFC were characterized by different techniques (e.g., FE-SEM, XRD, EPMA-EDX) to check the effect of salt on NFC aggregation. The interactions between NFC and NaCl at different pH conditions have been discussed and the rheology of the redispersed NFC suspension has been performed. All the results prove a perfect water redispersion at pH 8 and exactly similar suspension is obtained after water dispersion of dried NFC following our procedure. These results are very promising for increasing application of NFC.
本研究首次报道了一种使用冷冻干燥法获得水再分散干燥 NFC 的方法。为了得到这种产品，不需要进行化学表面改性。选择添加盐（氯化钠：NaCl）策略来分别在干燥和再分散步骤中阻断和再生氢键。在不同 pH 值（即 4、6、8 和 10）下制备了多个样品。使用不同的技术（例如 FE-SEM、XRD、EPMA-EDX）对所有再分散的 NFC 进行了表征，以检查盐对 NFC 聚集的影响。讨论了 NFC 和 NaCl 在不同 pH 条件下的相互作用，并对再分散的 NFC 悬浮液的流变性能进行了研究。所有结果均表明在 pH 8 时具有完美的水再分散性，并且按照我们的程序在干燥 NFC 后的水分散后获得了完全相似的悬浮液。这些结果对于增加 NFC 的应用非常有希望。
