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Competitive adsorption of amylopectin and amylose on cationic nanoparticles: a study on the aggregation mechanism

Frida Iselau (Institutionen för kemi och kemiteknik ; SuMo Biomaterials) ; Tuan Phan-Xuan (Institutionen för fysik, Kondenserade materiens fysik (Chalmers) ; SuMo Biomaterials) ; Aleksandar Matic (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; M. Persson ; Krister Holmberg (Institutionen för kemi och kemiteknik, Teknisk ytkemi) ; Romain Bordes (Institutionen för kemi och kemiteknik, Teknisk ytkemi)
Soft Matter (1744-683X). Vol. 12 (2016), 14, p. 3388-3397.
[Artikel, refereegranskad vetenskaplig]

In this study we investigate the interactions between cationic nanoparticles and anionic starch, where the starch was composed of 20 wt% of amylose, a linear polymer, and 80 wt% of amylopectin, a branched polymer. The mechanism of aggregation was investigated by scattering techniques. It was found that the cationic particles formed large aggregates with the starch as a result of selective adsorption of the amylopectin. Amylose did not participate significantly in the aggregate formation even when the charge ratio of starch to particles was <1. For starch to particle ratio 41 stabilization was recovered mostly due to the large hindrance brought about by the highly branched amylopectin. This results in a shift of the stabilization mechanism from electrostatic to electrosteric. The internal structure of the aggregates was composed of primary particles with starch coils adsorbed on the surface. This information supports the proposed aggregation mechanism, which is based on adsorption of the negatively charged starch in patches on the positively charged nanoparticles causing attractive interaction between the particles.

Nyckelord: dynamic light-scattering, latex-particles, physicochemical properties, adsorbed polyelectrolytes, flocculation, starches, behavior, suspensions, polymers, silica, Chemistry, Materials Science

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Denna post skapades 2016-05-04. Senast ändrad 2016-10-04.
CPL Pubid: 235959


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