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    Development of water-in-oil Pickering emulsions from sodium oleate surface-modified nano-hydroxyapatite

    Year: 2022

    Journal: Surf. Interfaces, Volume 29, APR

    Authors: Ribeiro, Andreia; Manrique, Yaidelin A.; Lopes, Jose Carlos B.; Dias, Madalena M.; Barreiro, Maria Filomena

    Organizations: LSRE-LCM - FCT/MCTES (PIDDAC) [UIDB/50020/2020, UIDP/50020/2020]; CIMO -Centro de Investigacao de Montanha - FCT/MCTES (PIDDAC) [UIDB/00690/2020]; N2020, under PT2020, through ESF [NORTE-08-5369-FSE-000028]

    Keywords: Hydroxyapatite; Sodium oleate; Surface modification; W/O Pickering emulsions; Stability

    The stabilisation of water-in-oil (W/O) Pickering emulsions is still a challenge for the scientific community. In this work, sodium oleate (SO) surface modified nano-hydroxyapatite (n-HAp) particles were produced and tested as W/O stabilisers. The modified n-HAp particles presented a wettability dependent on the used SO content, switching from hydrophilic (initial state) to hydrophobic (one SO layer) and back to hydrophilic (two SO layers). The Pickering emulsions produced with the particles holding one SO layer (contact angle similar to 90 degrees) showed their tight adsorption at the water-oil interface (confocal analysis), and maintained the stability up to 15 days. Overall this work provides new developments in the field of W/O Pickering emulsions, a topic less studied than O/W, opening new avenues for several applications.
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