Aerocellulose: New highly porous cellulose prepared from cellulose-NaOH aqueous solutions
Aerocellulose: New highly porous cellulose prepared from cellulose-NaOH aqueous solutions
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DOI：
10.1021/bm700972k
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发表时间：
2008-01-01
影响因子：
6.2
通讯作者：
Budtova, Tatiana
中科院分区：
文献类型：
--
作者：
Gavillon, Roxane;Budtova, Tatiana
由纤维素/NaOH水溶液制备了称为“气纤维素”的新型高度多孔的纯纤维素气凝胶状材料。将溶液凝胶化得到三维物体，然后在超临界条件下使用CO2再生和干燥纤维素。气纤维素的孔隙率大于95%，具有孔径分布。从几十纳米到几十微米。内比表面积约为200-300 m2/g，密度范围为0.06 - 0.3 g/cm 3，取决于制备条件。研究了纤维素DP和浓度、添加表面活性剂导致溶液发泡、凝胶化条件以及再生浴的温度和酸度对气纤维素形态的影响。将结果与由纤维素/NMMO溶液制备的另一种类型的气纤维素进行比较。
New highly porous pure cellulose aerogel-like material called "aerocellulose" was prepared from aqueous cellulose/NaOH solutions. Solutions were gelled to obtain shaped three-dimensional objects, then cellulose was regenerated and dried in supercritical conditions using CO2 The porosity of aerocellulose is higher than 95% with pore sizes distribution. from a few tens of nanometers to a few tens of micrometers. The internal specific surface area is around 200-300 m(2)/g, and density ranges from 0.06 to 0.3 g/cm(3), depending on the preparation conditions. The influence of cellulose DP and concentration, of the addition of a surfactant leading to solution foaming, of gelation conditions and the temperature and acidity of regenerating bath on the morphology of aerocellulose has been studied. The results are compared with another type of aerocellulose that was prepared from cellulose/NMMO solutions.