Aerogels from nanofibrillated cellulose with tunable oleophobicity

被引：248

作者：

Aulin, Christian ^{[1
,2
]}

Netrval, Julia ^{[1
]}

Wagberg, Lars ^{[1
]}

Lindstrom, Tom ^{[3
]}

机构：

[1] Royal Inst Technol, Dept Fibre & Polymer Technol, Sch Chem Sci & Engn, SE-10044 Stockholm, Sweden

[2] BIM Kemi AB, SE-44303 Stenkullen, Sweden

[3] Innventia AB, SE-11486 Stockholm, Sweden

来源：

SOFT MATTER | 2010年 / 6卷 / 14期

关键词：

HYDROGEN-BONDING SYSTEM; SUPER-WATER-REPELLENT; SYNCHROTRON X-RAY; ORGANIC AEROGELS; MICROFIBRILLATED CELLULOSE; HYDROPHOBIC SURFACES; CRYSTAL-STRUCTURE; CARBON; SILICA; FIBER;

D O I：

10.1039/c001939a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The formation of structured porous aerogels of nanofibrillated cellulose (NFC) by freeze-drying has been demonstrated. The aerogels have a high porosity, as shown by FE-SEM and nitrogen adsorption/desorption measurements, and a very low density ( < 0.03 g cm(-3)). The density and surface texture of the aerogels can be tuned by selecting the concentration of the NFC dispersions before freeze-drying. Chemical vapor deposition (CVD) of 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (PFOTS) was used to uniformly coat the aerogel to tune their wetting properties towards non-polar liquids. An XPS analysis of the chemical composition of the PFOTS-modified aerogels demonstrated the reproducibility of the PFOTS-coating and the high atomic fluorine concentration (ca. 51%) in the surfaces. The modified aerogels formed a robust composite interface with high apparent contact angles (theta* >> 90 degrees) for castor oil (gamma(1v) = 35.8 mN m(-1)) and hexadecane (gamma(1v) = 27.5 mN m(-1)).

引用

页码：3298 / 3305

页数：8

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