In this study, the effect of anionic surfactant, sodium dodecyl sulfate (SDS), on the structure and thermal insulation properties of the citric acid crosslinked CNF foam is investigated. The addition of the SDS improves the foam structure, and the prepared CNF foam indicates a porosity of around 99% and a density of around 20 mg/cm3 with very low shrinkage. SEM and FTIR are used to examine the morphology and chemical interactions. Further, the effect of the SDS on the thermal conductivity of the foam is investigated, and the foam shows thermal conductivity comparable with polyurethane foam.
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