Gavillon Roxane, Budtova Tatiana
Ecole des Mines de Paris, Centre de Mise en Forme des Matériaux (CEMEF), Sophia-Antipolis, France.
Biomacromolecules. 2008 Jan;9(1):269-77. doi: 10.1021/bm700972k. Epub 2007 Dec 18.
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 m2/g, and density ranges from 0.06 to 0.3 g/cm3, 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.
一种名为“气凝胶纤维素”的新型高孔隙率纯纤维素气凝胶状材料由纤维素/氢氧化钠水溶液制备而成。将溶液凝胶化以获得成型的三维物体，然后使纤维素再生，并在超临界条件下使用二氧化碳进行干燥。气凝胶纤维素的孔隙率高于95%，孔径分布从几十纳米到几十微米。内部比表面积约为200 - 300平方米/克，密度根据制备条件在0.06至0.3克/立方厘米之间变化。研究了纤维素聚合度和浓度、添加导致溶液起泡的表面活性剂、凝胶化条件以及再生浴的温度和酸度对气凝胶纤维素形态的影响。将结果与由纤维素/N - 甲基吗啉 - N - 氧化物（NMMO）溶液制备的另一种气凝胶纤维素进行了比较。
