纳米纤维
多孔性
纤维素
材料科学
气凝胶
纳米复合材料
聚合物
复合材料
纳米纤维素
生物高聚物
细菌纤维素
化学工程
工程类
作者
Houssine Sehaqui,Michaela Salajková,Qi Zhou,Lars A. Berglund
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2010-01-01
卷期号:6 (8): 1824-1824
被引量:400
摘要
Low-density structures of mechanical function in plants, arthropods and other organisms, are often based on high-strength cellulose or chitin nanofibers and show an interesting combination of flexibility and toughness. Here, a series of plant-inspired tough and mechanically very robust cellular biopolymer foams with porosities as high as 99.5% (porosity range 93.1–99.5%) were therefore prepared by solvent-free freeze-drying from cellulose I wood nanofiber water suspensions. A wide range of mechanical properties was obtained by controlling density and nanofiber interaction in the foams, and density–property relationships were modeled and compared with those for inorganic aerogels. Inspired by cellulose–xyloglucan (XG) interaction in plant cell walls, XG was added during preparation of the toughest foams. For the cellulose–XG nanocomposite foams in particular, the mechanical properties at comparable densities were superior to those reported in the literature for clay aerogel/cellulose whisker nanocomposites, epoxy/clay aerogels, polymer/clay/nanotube aerogels, and polymer/silica aerogels. The foam structure was characterized by high-resolution field-emission scanning electron microscopy and the specific surface area was measured by nitrogen physisorption. Dynamic mechanical thermal analysis and uniaxial compression tests were performed. The foam was thermally stable up to 275 °C where cellulose started to degrade.
科研通智能强力驱动
Strongly Powered by AbleSci AI