This proposal forms part of an ongoing project concerning interpenetrating network gels of starch and cellulose being developed towards applications in personal care and agrochemicals, based on the interests of our industrial partners. Following our previous experiment focused on the cellulose-starch network, this study aims to investigate the interaction of cellulose nanofibrils and soluble starch in presence of cationic surfactants. Cationic surfactants, with a hydrophilic positively charged head and a hydrophobic uncharged tail, can potentially electrostatically interact with the negatively-charged cellulose nanofibrils and insert into hydrophobic starch helices. The aim, using deuterated or hydrogenated versions of the surfactant, is to better understand the structuring in this system and relate it to the enhanced rheological properties found when cationic surfactant is added.