Highly Efficient and Reversible Inversion of a Pickering Emulsion Triggered by CO2/N2 at Ambient Conditions

Emulsion inversion has great potential in applications such as materials science, chemical reactions, and drug delivery. Therefore, developing a simple and green approach to control emulsion inversion is highly desirable. Herein an octyl- and bis(2-hydroxyethyl)-3-amino-bifunctionalized silica microsphere (SM-O-BIS) is designed, prepared, and used to fabricate a Pickering emulsion. It is found for the first time that this Pickering emulsion can be easily and reversibly inverted from water-in-oil (w/o) to oil-in-water (o/w) by alternate bubbling of CO2 and N2 at room temperature and atmospheric pressure. The molar ratio of trimethoxyoctylsilane to bis(2-hydroxyethyl)-3-aminopropyltriethoxysilane on the surface of silica is important for the emulsion inversion. This unique inversion can be recycled multiple times without any deterioration. By utilizing the emulsion inversion strategy, encapsulation and release of curcumin molecules have been actualized on demand. The possible mechanism of emulsion inversion...

[1]  J. Gomes,et al.  Amine functionalized porous silica for CO2/CH4 separation by adsorption: Which amine and why , 2018 .

[2]  Zhiyong Li,et al.  Visible Light-Controlled Inversion of Pickering Emulsions Stabilized by Functional Silica Microspheres. , 2018, Langmuir : the ACS journal of surfaces and colloids.

[3]  Yongming Zhang,et al.  CO2-Switchable Pickering Emulsion Using Functionalized Silica Nanoparticles Decorated by Amine Oxide-Based Surfactants , 2018 .

[4]  Sahdeo Prasad,et al.  Curcumin, the golden nutraceutical: multitargeting for multiple chronic diseases , 2017, British journal of pharmacology.

[5]  Sierin Lim,et al.  Protein Nanocage as a pH-Switchable Pickering Emulsifier. , 2017, ACS applied materials & interfaces.

[6]  M Sam Mannan,et al.  Thermosensitive ZrP-PNIPAM Pickering Emulsifier and the Controlled-Release Behavior. , 2017, ACS applied materials & interfaces.

[7]  J. Gomes,et al.  Structure of Chemisorbed CO(2) Species in Amine-Functionalized Mesoporous Silicas Studied by Solid-State NMR and Computer Modeling. , 2017, Journal of the American Chemical Society.

[8]  Yongming Zhang,et al.  CO2-Triggered Pickering Emulsion Based on Silica Nanoparticles and Tertiary Amine with Long Hydrophobic Tails. , 2016, Langmuir : the ACS journal of surfaces and colloids.

[9]  Yapei Wang,et al.  Tuning Amphiphilicity of Particles for Controllable Pickering Emulsion , 2016, Materials.

[10]  Michael C. Kolios,et al.  Synthesis of Stable Multifunctional Perfluorocarbon Nanoemulsions for Cancer Therapy and Imaging. , 2016, Langmuir : the ACS journal of surfaces and colloids.

[11]  Jie Wu,et al.  Recent Studies of Pickering Emulsions: Particles Make the Difference. , 2016, Small.

[12]  E. Chan,et al.  Curcumin enhances human macrophage control of Mycobacterium tuberculosis infection , 2016, Respirology.

[13]  J. Aburto,et al.  Study of the formation and breaking of extra-heavy-crude-oil-in-water emulsions—A proposed strategy for transporting extra heavy crude oils , 2015 .

[14]  Chaoyang Wang,et al.  Redox responsive diselenide colloidosomes templated from Pickering emulsions for drug release. , 2015, Journal of controlled release : official journal of the Controlled Release Society.

[15]  Zhiyong Li,et al.  Reversible Hydrophobic-Hydrophilic Transition of Ionic Liquids Driven by Carbon Dioxide. , 2015, Angewandte Chemie.

[16]  Zhenggang Cui,et al.  Switchable Pickering emulsions stabilized by silica nanoparticles hydrophobized in situ with a conventional cationic surfactant. , 2015, Langmuir : the ACS journal of surfaces and colloids.

[17]  Véronique Nardello-Rataj,et al.  Pickering interfacial catalysis for biphasic systems: from emulsion design to green reactions. , 2015, Angewandte Chemie.

[18]  Qihua Wang,et al.  Stimuli-responsive composite particles as solid-stabilizers for effective oil harvesting. , 2014, ACS applied materials & interfaces.

[19]  Xiaogang Qu,et al.  Light controlled reversible inversion of nanophosphor-stabilized Pickering emulsions for biphasic enantioselective biocatalysis. , 2014, Journal of the American Chemical Society.

[20]  Zhenghe Xu,et al.  Surfactant-free switchable emulsions using CO2-responsive particles. , 2014, ACS applied materials & interfaces.

[21]  Zhenggang Cui,et al.  Switchable pickering emulsions stabilized by silica nanoparticles hydrophobized in situ with a switchable surfactant. , 2013, Angewandte Chemie.

[22]  Jian Xu,et al.  Ca2+ ion responsive pickering emulsions stabilized by PSSMA nanoaggregates. , 2013, Langmuir : the ACS journal of surfaces and colloids.

[23]  F. Moura,et al.  Biphasic oxidation promoted by magnetic amphiphilic nanocomposites undergoing a reversible emulsion process , 2013 .

[24]  K. Landfester,et al.  Pickering-type stabilized nanoparticles by heterophase polymerization. , 2013, Chemical Society reviews.

[25]  Hengquan Yang,et al.  A strategy for separating and recycling solid catalysts based on the pH-triggered Pickering-emulsion inversion. , 2013, Angewandte Chemie.

[26]  T. Emrick,et al.  Triggered in situ disruption and inversion of nanoparticle-stabilized droplets. , 2013, Angewandte Chemie.

[27]  Carlos A. Muniesa,et al.  Hybrid PLGA-Organosilica Nanoparticles with Redox-Sensitive Molecular Gates , 2013 .

[28]  Walter Richtering,et al.  Microgel-stabilized smart emulsions for biocatalysis. , 2013, Angewandte Chemie.

[29]  O. Velev,et al.  Magnetically responsive pickering foams. , 2011, Journal of the American Chemical Society.

[30]  B. Han,et al.  Emulsion inversion induced by CO2. , 2011, Physical chemistry chemical physics : PCCP.

[31]  K. Wong,et al.  Phase inversion of particle-stabilised perfume oil-water emulsions: experiment and theory. , 2010, Physical chemistry chemical physics : PCCP.

[32]  Franklin Kim,et al.  Graphene oxide sheets at interfaces. , 2010, Journal of the American Chemical Society.

[33]  W. Richtering,et al.  Magnetic, Thermosensitive Microgels as Stimuli‐Responsive Emulsifiers Allowing for Remote Control of Separability and Stability of Oil in Water‐Emulsions , 2007 .

[34]  C. Eckert,et al.  Switchable Surfactants , 2006, Science.

[35]  S. Armes,et al.  Temperature-induced inversion of nanoparticle-stabilized emulsions. , 2005, Angewandte Chemie.

[36]  Wilhelm T S Huck,et al.  Locking and unlocking of polyelectrolyte brushes: toward the fabrication of chemically controlled nanoactuators. , 2005, Angewandte Chemie.

[37]  S. Armes,et al.  Syntheses of shell cross-linked micelles using acidic ABC triblock copolymers and their application as pH-responsive particulate emulsifiers. , 2005, Journal of the American Chemical Society.

[38]  To Ngai,et al.  Novel emulsions stabilized by pH and temperature sensitive microgels. , 2005, Chemical communications.

[39]  J. Salager,et al.  Using emulsion inversion in industrial processes. , 2004, Advances in colloid and interface science.

[40]  W. Stöber,et al.  Controlled growth of monodisperse silica spheres in the micron size range , 1968 .