Efficient, Self-Terminating Isolation of Cellulose Nanocrystals through Periodate Oxidation in Pickering Emulsions.
Efficient, Self-Terminating Isolation of Cellulose Nanocrystals through Periodate Oxidation in Pickering Emulsions.
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通过皮克林乳液中的高碘酸盐氧化高效、自终止地分离纤维素纳米晶体
DOI：
10.1002/cssc.201801678
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发表时间：
2018
期刊：
影响因子：
8.4
通讯作者：
K. Zhang
中科院分区：
文献类型：
--
作者：
P. Liu;B. Pang;L. Tian;T. Schäfer;T. Gutmann;H. Liu;C. A. Volkert;G. Buntkowsky;K. Zhang
在过去的二十年中，已经做出了许多努力来从原材料中分离天然纳米晶体，例如纤维素纳米晶体（CNC），但是现有的方法仍然存在收率低、合成过程复杂以及所获得的CNC尺寸不均匀的问题。本研究涉及一种简便、自终止和有效的方法，用于在Pickering乳液中的高碘酸盐氧化过程中以高产率形成均匀的CNCs。使用含有溶解有己胺的己烷和高碘酸钠（NaIO4）水溶液的两相体系作为反应介质。由于其在水中的有限溶解度，通过己胺调节，水相的pH值提高到约9.8，导致正高碘酸钠（Na2H3IO6）纳米片沉淀，从而形成初始Pickering乳液。在纤维素纳米纤维和随后的CNCs逐渐形成的过程中，CNCs被吸引以稳定Pickering乳液的界面，这防止了CNCs在水性悬浮液中被氧化剂进一步分解。因此，这种分离策略确保了基于其自身特定的两亲性质的CNC的有效分离，并实现了高达56wt%的高产率。
Many efforts have been made to isolate native nanocrystals from raw materials in the last two decades, such as cellulose nanocrystals (CNCs), but existing methods still suffer from low yields, complicated synthesis processes, and nonuniform sizes of obtained CNCs. This study concerns a facile, self‐terminating, and efficient method for the formation of uniform CNCs in high yields during the periodate oxidation process within Pickering emulsions. A biphasic system containing hexane with dissolved hexylamine and an aqueous solution of sodium periodate (NaIO4) was used as the reaction medium. Regulated by hexylamine, owing to its limited solubility in water, the pH value of the aqueous phase was enhanced to around 9.8, leading to the precipitation of sodium orthoperiodate (Na2H3IO6) nanoplates and thus the formation of the initial Pickering emulsions. During the gradual formation of cellulose nanofibers and then CNCs, CNCs were attracted to stabilize the interface of the Pickering emulsions, which prevented further decomposition of CNCs by the oxidizing agent in aqueous suspensions. Thus, this isolation strategy secured the efficient separation of CNCs based on their own particular amphiphilic properties and achieved a high yield of up to 56 wt %.
影响因子：
5.7
作者：
Calvini, P;Conio, G;Pedemonte, E
通讯作者：
Pedemonte, E
影响因子：
15
作者：
Nishiyama, Y;Langan, P;Chanzy, H
通讯作者：
Chanzy, H