The build-up of polyelectrolyte multilayers of microfibrillated cellulose and cationic polyelectrolytes

Langmuir : the ACS Journal of Surfaces and Colloids
Lars WågbergKarl Axnäs

Abstract

A new type of nanocellulosic material has been prepared by high-pressure homogenization of carboxymethylated cellulose fibers followed by ultrasonication and centrifugation. This material had a cylindrical cross-section as shown by transmission electron microscopy with a diameter of 5-15 nm and a length of up to 1 microm. Calculations, using the Poisson-Boltzmann equation, showed that the surface potential was between 200 and 250 mV, depending on the pH, the salt concentration, and the size of the fibrils. They also showed that the carboxyl groups on the surface of the nanofibrils are not fully dissociated until the pH has reached pH = approximately 10 in deionized water. Calculations of the interaction between the fibrils using the Derjaguin-Landau-Verwey-Overbeek theory and assuming a cylindrical geometry indicated that there is a large electrostatic repulsion between these fibrils, provided the carboxyl groups are dissociated. If the pH is too low and/or the salt concentration is too high, there will be a large attraction between the fibrils, leading to a rapid aggregation of the fibrils. It is also possible to form polyelectrolyte multilayers (PEMs) by combining different types of polyelectrolytes and microfibrillated cellu...Continue Reading

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Citations

Nov 5, 2013·Micron : the International Research and Review Journal for Microscopy·Gary Chinga-CarrascoTrond Karlsen
May 3, 2013·ACS Applied Materials & Interfaces·Monika OsterbergJanne Laine
Jul 10, 2013·ACS Applied Materials & Interfaces·Christian AulinTom Lindström
Mar 20, 2012·Biomacromolecules·Supachok TanpichaiStephen J Eichhorn
Aug 29, 2012·Biomacromolecules·Emil GustafssonTorbjörn Pettersson
Sep 8, 2012·Biomacromolecules·Teruaki SatoEmily D Cranston
May 25, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Irina KalashnikovaIsabelle Capron
Aug 13, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Andreas B FallLars Wågberg
Oct 15, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Sandra J VeenKrassimir P Velikov
Apr 20, 2014·International Journal of Molecular Sciences·Arttu MiettinenMarkku Kataja
Apr 23, 2014·Carbohydrate Polymers·Karoliina JunkaJanne Laine
Jun 8, 2014·Carbohydrate Polymers·Alina LozhechnikovaMonika Österberg
Jan 27, 2016·ACS Applied Materials & Interfaces·Minna HakalahtiTekla Tammelin
Dec 20, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Martin UhligGustav Nyström
Mar 19, 2013·Micron : the International Research and Review Journal for Microscopy·Gary Chinga-Carrasco
Nov 15, 2011·Comptes rendus biologies·Arayik HambardzumyanVéronique Aguié-Béghin
Dec 22, 2015·Carbohydrate Polymers·Lydia C PowellDavid W Thomas
May 21, 2011·Angewandte Chemie·Dieter KlemmAnnie Dorris
Mar 19, 2016·ACS Applied Materials & Interfaces·Malladi NagalakshmaiahAlain Dufresne
Feb 11, 2014·Carbohydrate Polymers·Tobias MobergEmma Levenstam Bragd
Feb 13, 2013·Carbohydrate Polymers·Xinwang CaoGang Sun

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