In recent work with Unilever we have been investigating the structure of gels formed by partially oxidised cellulose nanofibrils for use in sustainable personal care products. These nanofibrils form strong gels with anionic surfactants, but nonionic surfactants gel the nanofibrils only in the presence of salts. Nonionic surfactants have been shown in neutron reflectivity studies to adsorb on cellulose surfaces but no studies of anionic surfactants have been reported in the literature. Here we propose to compare the adsorption of anionic and nonionic surfactants on films prepared from oxidised cellulose nanofibrils in the presence and absence of monovalent and divalent cations as a model system to understand interactions between surfactants, cations and the cellulose surfaces. This will help us to determine the role of micelle binding to the cellulose in the formation of gels in this system. This is a resubmission of a previous unsuccessful proposal, where the panel requested more pre-characterisation of the oxidised cellulose films. AFM and X-ray reflectivity results on our films have now been added to the proposal to demonstrate the suitability of our films for these experiments.