<  Back to the Polytechnique Montréal portal

Sodium alginate-grafted submicrometer particles display enhanced reversible aggregation/disaggregation properties

Faezeh Sabri, Kevin Berthomier, Antoine Marion, Louis Fradette, Jason Robert Tavares and Nick Virgilio

Article (2018)

Accepted Version
Terms of Use: Creative Commons Attribution Non-commercial No Derivatives .
Download (961kB)
Cite this document: Sabri, F., Berthomier, K., Marion, A., Fradette, L., Tavares, J. R. & Virgilio, N. (2018). Sodium alginate-grafted submicrometer particles display enhanced reversible aggregation/disaggregation properties. Carbohydrate Polymers, 194, p. 61-68. doi:10.1016/j.carbpol.2018.04.012
Show abstract Hide abstract


In this article, we demonstrate that submicrometer particles with surface-grafted sodium alginate (SA) display enhanced and reversible aggregation/disaggregation properties in aqueous solution. 300 nm silica particles were first functionalized with an aminosilane coupling agent, followed by the grafting of pH-sensitive SA, as confirmed by zeta potential, XPS and FTIR analyses. The SA-modified particles show enhanced aggregation properties at acidic pH compared to unmodified silica, with a 10 times increase in average aggregate diameter. The process is reversible, as the aggregates can be broken and dispersed again when the pH is increased back to 7.0. As a result, the sedimentation rate of SA-modified particles at pH 3.0 is both significantly faster and complete compared to the unmodified particles. This enhanced aggregation is most likely due to the formation of intermolecular hydrogen bonds between neighboring SA-modified particles. This work illustrates how surface-grafted macromolecules of natural origins can be used to tune interparticle interactions, in order to improve separation processes.

Uncontrolled Keywords

submicrometer particle, surface modification, sodium alginate, pH sensitive, aggregation.

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Funders: Imperial Oil through a University Research Award grant, Total company, National Sciences and Engineering Research Council (Discovery Grant), CREPEC (Projet Structurant), Polytechnique Montreal (UPIR undergraduate research grants), Canada Foundation for Innovation (John R. Evans Leaders Fund)
Date Deposited: 09 Jan 2019 15:42
Last Modified: 08 Apr 2021 10:43
PolyPublie URL: https://publications.polymtl.ca/3734/
Document issued by the official publisher
Journal Title: Carbohydrate Polymers (vol. 194)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.carbpol.2018.04.012


Total downloads

Downloads per month in the last year

Origin of downloads


Repository Staff Only