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Oil-in-oil Pickering emulsions stabilized by shigaite-like layered double hydroxide particles
Abstract In this work, we report the preparation of simple oil-in-oil emulsions using layered nanoparticles as stabilizers at the interface between silicone and castor oil. Layered double hydroxides with a shigaite-like structure presenting an ideal composition of [Mn6Al3(OH)18][(SO4)2Na].12H2O (S-Na/SO4) were prepared by co-precipitation with increasing pH, followed by particle surface grafting with octhadecyltrimethoxysilane (S-OTMS) in an apolar medium. The powder XRD, SEM, TEM, and specific surface area (BET) techniques showed that the structure and morphology of silane-grafted S-Na/SO4 remained practically unchanged. FTIR, EDS and ICP-OES analyses indicated that the silanes were successfully grafted onto the S-Na/SO4 surface. In addition, to maintaining their structure and morphology, these functionalized materials showed good performance in controlling the hydrophobicity of the surface for application in oil-in-oil emulsions, improving their compatibility for the dispersion in non-polar liquids.
Highlights Shigaite-like [Mn6Al3(OH)18][(SO4)2Na].12H2O (S-Na/SO4) was synthesized. S-Na/SO4 particles surfaces were grafted with octhadecyltrimethoxysilane (S-OTMS). S-Na/SO4 and S-OTMS were used to stabilize oil-in-oil Pickering emulsions. Rheology measurements indicated the formation of a weak gel for both systems.
Oil-in-oil Pickering emulsions stabilized by shigaite-like layered double hydroxide particles
Abstract In this work, we report the preparation of simple oil-in-oil emulsions using layered nanoparticles as stabilizers at the interface between silicone and castor oil. Layered double hydroxides with a shigaite-like structure presenting an ideal composition of [Mn6Al3(OH)18][(SO4)2Na].12H2O (S-Na/SO4) were prepared by co-precipitation with increasing pH, followed by particle surface grafting with octhadecyltrimethoxysilane (S-OTMS) in an apolar medium. The powder XRD, SEM, TEM, and specific surface area (BET) techniques showed that the structure and morphology of silane-grafted S-Na/SO4 remained practically unchanged. FTIR, EDS and ICP-OES analyses indicated that the silanes were successfully grafted onto the S-Na/SO4 surface. In addition, to maintaining their structure and morphology, these functionalized materials showed good performance in controlling the hydrophobicity of the surface for application in oil-in-oil emulsions, improving their compatibility for the dispersion in non-polar liquids.
Highlights Shigaite-like [Mn6Al3(OH)18][(SO4)2Na].12H2O (S-Na/SO4) was synthesized. S-Na/SO4 particles surfaces were grafted with octhadecyltrimethoxysilane (S-OTMS). S-Na/SO4 and S-OTMS were used to stabilize oil-in-oil Pickering emulsions. Rheology measurements indicated the formation of a weak gel for both systems.
Oil-in-oil Pickering emulsions stabilized by shigaite-like layered double hydroxide particles
do Amaral, Lilian Fernanda Martins (author) / Aires, Gabriela Siegel (author) / Wypych, Fernando (author) / de Freitas, Rilton Alves (author)
Applied Clay Science ; 238
2023-03-30
Article (Journal)
Electronic Resource
English
Adsorption of bacteria onto layered double hydroxide particles to form biogranule-like aggregates
| Online Contents | 2013