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In this paper, we report a novel redox responsive water-in-oil Pickering emulsion stabilized by negatively charged silica nanoparticles in combination with a trace amount of redox switchable fluorescent molecule ferrocene azine (FcA), in which ferrocene serves as a redox-sensitive group, and anthryl unit serves as a fluorescence emission center. By alternately adding oxidant and reducing agent at a moderate condition, the amphiphilicity of silica nanoparticles changes because of the adsorption of Fc+A and the desorption of FcA on the silica surface. On one hand, the stability of emulsions can be transformed between stable and unstable at ambient temperature via redox trigger, and the regulation process can be cycled at least three times. On the other hand, the fluorescent intensity of FcA molecule can be regulated by redox stimuli, thus the change in fluorescent behavior of the emulsion droplets is observed upon redox cycles, which makes it useful in the fluorescent label of stimuli-responsive Pickering emulsions. This work provides a deep understanding of regulation mechanism of Pickering emulsions upon redox stimuli and opens the new way for in-situ fluorescent label of stimulus-responsive Pickering emulsions without introducing additional fluorescent molecule.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
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Colloids formed by the combination of two immiscible liquids such as oil and water. Lipid-in-water emulsions are usually liquid, like milk or lotion. Water-in-lipid emulsions tend to be creams. The formation of emulsions may be aided by amphiphatic molecules that surround one component of the system to form MICELLES.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
Emulsions of fats or lipids used primarily in parenteral feeding.
A scanning probe microscopy technique that uses an ultramicroelectrode as the scanning probe that simultaneously records changes in electrochemical potential as it scans thereby creating topographical images with localized electrochemical information.
Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver.