Investigating chromatographic interactions in porous pigment coatings between inkjettable polyelectrolytes and model colorant solutions

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • Omya AG


Printed, self-contained sensor designs based on capillary transport and microfluidic principles form a major part of current research in printed functionality. Previous work into such designs has mainly focused on cellulosic papers as base substrates. In this study, novel findings are presented employing alternative custom-designed functional pigment coated substrates, locally functionalised by inkjet printed polyelectrolytes, to separate or transport anionic or cationic molecules by surface chemistry tailoring. Both anionised and cationised coatings are tested and found to transport similarly charged model colorants successfully, while separating those of opposite charge, with the extent of separation depending on colorant concentration. Furthermore, surface chemistry reversal by cationic (polyethyleneimine, polyDADMAC) and anionic (carboxymethyl cellulose) polyelectrolyte inks is demonstrated as a complementary method for analyte separation or concentration. However, the deposition of the polyelectrolyte ink itself was found to affect the cationised coating by solubilising and re-depositing coating components, while the printed polyethyleneimine was found to be partially dissolved and transported by water elution, suggesting limited adsorption under tested conditions.


Original languageEnglish
Article number123676
Number of pages13
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Early online date15 Jul 2019
Publication statusPublished - 20 Oct 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Chromatographic separation, Functional coating, Functional printing, Inkjet printing, Polyelectrolyte

ID: 35735492