Cellulose　nanofibers　(CNFs)　from　kelp　were　prepared　by　cellulase　treatment　with　lengths　greater　than　3　μm.　CNFs　were　further　oxidized　by　TEMPO-oxidized　system,　and　the　lengths　of　the　oxidized　CNFs　(TEMPO-CNFs)　were　0.6−1　μm.　AFM　and　TEM　images　showed　that　intertwined　CNFs　fibers　were　divided　into　individual　nanofibrils.　The　crystallinity　of　TEMPO-CNFs　increased　to　66.5　%.　TGA　analysis　indicated　that　TEMPO-CNFs　were　more　sensitive　to　temperature　than　cellulose　and　CNFs.　FT-IR　spectra　revealed　no　changes　in　the　basic　cellulose　structures　of　CNFs　and　TEMPO-CNFs.　In　the　sunflower　oil/water　(20/80,　v/v)　model　emulsions,　the　oil　droplet　sizes　were　less　than　20　μm　in　CNFs　emulsions,　which　became　smaller　in　TEMPO-CNFs　emulsions.　Delamination　was　found　in　CNFs　emulsions　after　three　days　of　storage.　Addition　of　NaCl　increased　the　volumes　of　TEMPO-CNFs　emulsions　but　enlarged　the　oil　droplets　sizes.　TEMPO-CNFs　emulsions　had　the　largest　volume　with　smallest　and　most　homogeneous　oil　droplets　at　pH　3.　TEMPO-CNFs　emulsions　showed　good　stability　after　storage　for　30　days.　Further,　TEMPO-CNFs　could　also　emulsify　50　%　(v/v)　of　sunflower　oil.　All　these　results　indicated　that　TEMPO-CNFs　can　be　used　in　preparing　Pickering　emulsions.　©　2020