Fischer-Tropsch diesel emulsions stabilised by microfibrillated cellulose and nonionic surfactants
Journal article, 2010

Water-in-diesel emulsion fuels have been prepared with a combination of sorbitan monolaurate and glycerol monooleate as emulsifier and with microfibrillated cellulose (MFC) of different hydrophilic/hydrophobic character as stabilizer. The MFC was treated with either octadecylamine or poly(styrene-co-maleic anhydride), resulting in very hydrophobic fibrils. The most stable emulsion was achieved with a combination of hydrophilic (untreated) and hydrophobic MFC and only minute amounts of the stabilizer gave a pronounced effect. Even with the optimized formulation the lifetime of the emulsion was shorter than previously reported when a conventional polymeric stabilizer was used, however. The water drop sizes in the emulsions were determined by three methods: optical images, light scattering, and NMR diffusometry. All three methods gave water drops sizes of ca 2 μm. The NMR diffusometry indicated that besides the micrometer-sized emulsion drops a significant fraction of the water is present in small droplets of micelle size. The chemical exchange of water between these two populations of pools is believed to be the reason for the relatively low stability of the system.

Microfibrillated cellulose

Emulsion

NMR diffusometry

MFC

Fischer–Tropsch diesel

Author

Anna Lif

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

P Stenstad

SINTEF Materials and Chemistry

K Syverud

Papir- og fiberinstituttet AS

Magnus Nydén

SuMo Biomaterials

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Krister Holmberg

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 352 2 585-592

Subject Categories

Physical Chemistry

DOI

10.1016/j.jcis.2010.08.052

More information

Latest update

4/20/2018