Chiral nematic phase formation by aqueous suspensions of cellulose nanocrystals prepared by oxidation with ammonium persulfate
Chiral nematic phase formation by aqueous suspensions of cellulose nanocrystals prepared by oxidation with ammonium persulfate
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DOI：
10.1007/s10570-014-0308-1
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发表时间：
2014-08-01
期刊：
影响因子：
5.7
通讯作者：
Gray, Derek G.
中科院分区：
文献类型：
--
作者：
Castro-Guerrero, Carlos F.;Gray, Derek G.
人们对由植物细胞壁材料制备的纳米纤维素材料的不断增长的家族持续感兴趣。虽然大多数关于纤维素纳米晶体的研究集中在通过表面硫酸酯半酯稳定的硫酸水解产物上，但是也已经通过用过硫酸铵氧化木质纤维素材料来制备具有表面羧基的纤维素纳米晶体。主要区别在于过硫酸盐氧化导致由表面羧基稳定的纳米晶体。从棉花和木材，过硫酸盐氧化制备的纤维素纳米晶体的一些性能进行了比较与硫酸水解制备的纳米晶体所观察到的。偏光显微镜观察表明，过硫酸盐氧化法制备的手性悬浮液在水中也能形成手性有序相。
There is continuing interest in the growing family of nanocellulosic materials prepared from plant cell wall material. While most of the research on cellulose nanocrystals has focused on the product of sulfuric acid hydrolysis stabilized by surface sulfate half-esters, cellulose nanocrystals with surface carboxyl groups have also been prepared by oxidation of lignocellulosic materials with ammonium persulfate. The major difference is that the persulfate oxidation leads to nanocrystals stabilized by surface carboxyl groups. Some properties of cellulose nanocrystals from cotton and wood, prepared by persulfate oxidation, are compared with those observed for nanocrystals prepared by sulfuric acid hydrolysis. Evidence from polarized light microscopy showed that the nanocrystal suspensions prepared by persulfate oxidation also form chiral nematic ordered phases in water.