Measurement of interaction forces between lignin and cellulose as a function of aqueous electrolyte solution conditions.

• The interaction between a lignin film and cellulose sphere has been measured using the colloidal probe force technique as a function of aqueous electrolyte solution conditions. The lignin film was first studied for its roughness and stability using atomic force microscopy imaging and quartz crystal microbalance measurements respectively. The film was found to be smooth and stable in the pH range of 3.5 to 9 and in ionic strengths up to and including 0.01 M. This range of ionic strength and pH was hence used to measure the surface forces profiles between lignin and cellulose. Under these solution conditions, the measured forces behaved according to DLVO theory. The force-distance curves could be fitted between the limits of constant charge and constant potential and the surface potential of the lignin films was determined as a function of pH. At pH greater than 9.5, a short range steric repulsion was observed indicating that the film was swelling to a large extent but did not dissolve. Thus, lignin films prepared in this manner are suitable for a range of surface forces studies.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering (hsv//eng)

Nyckelord

Lignin

cellulose

model films

spin-coating

colloidal probe

surface forces

Poisson-Boltzmann cell model

DLVO theory

Chemical engineering

Kemiteknik

Publikations- och innehållstyp

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