Aerogels from Unaltered Bacterial Cellulose: Application of scCO2 Drying for the Preparation of Shaped, Ultra-Lightweight Cellulosic Aerogels

被引：153

作者：

Liebner, Falk ^{[1
]}

Haimer, Emmerich ^{[2
]}

Wendland, Martin ^{[2
]}

Neouze, Marie-Alexandra ^{[3
]}

Schlufter, Kerstin ^{[4
]}

Miethe, Peter ^{[4
]}

Heinze, Thomas ^{[5
]}

Potthast, Antje ^{[1
]}

Rosenau, Thomas ^{[1
]}

机构：

[1] Univ Bodenkultur Wien, Inst Organ Chem, A-1190 Vienna, Austria

[2] Univ Bodenkultur Wien, Inst Chem & Energy Engn, A-1190 Vienna, Austria

[3] Vienna Univ Technol, Inst Mat Chem, A-1060 Vienna, Austria

[4] fzmb GmbH, Res Ctr Med Technol & Biotechnol, D-99947 Bad Langensalza, Germany

[5] Univ Jena, Ctr Excellence Polysaccharide Res, D-07743 Jena, Germany

来源：

MACROMOLECULAR BIOSCIENCE | 2010年 / 10卷 / 04期

关键词：

aerogels; bacterial cellulose; biopolymers; porosity; renewable resources; ultra-lightweight materials; AEROCELLULOSE;

D O I：

10.1002/mabi.200900371

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Bacterial cellulose produced by the gram-negative bacterium Gluconacetobacter xylinum was found to be an excellent native starting material for preparing shaped ultra-lightweight cellulose aerogels. The procedure comprises thorough washing and sterilization of the aquogel, quantitative solvent exchange and subsequent drying with supercritical carbon dioxide at 40 degrees C and 100 bar. The average density of the obtained dry cellulose aerogels is only about 8 mg.cm(-3) which is comparable to the most lightweight silica aerogels and distinctly lower than all values for cellulosic aerogels obtained from plant cellulose so far. SEM, ESEM and nitrogen adsorption experiments at 77 K reveal an open-porous network structure that consists of a comparatively high percentage of large mesopores and smaller macropores.

引用

页码：349 / 352

页数：4

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