4.6 Article

Pickering Emulsions Stabilized by Mesoporous Nanoparticles with Different Morphologies in Combination with DTAB

Journal

ACS OMEGA
Volume 7, Issue 33, Pages 29153-29160

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsomega.2c03215

Keywords

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Funding

  1. National Natural Science Foundation of China [NSFC 21802077]
  2. Natural Science Foundation of Ningde Normal University [2018T03]

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This study investigated the effects of nanoparticle morphology on the stability and stimuli-responsive properties of Pickering emulsions. The results showed that the morphology of nanoparticles plays a significant role in determining the stability and droplet size of Pickering emulsions.
The morphology of nanoparticles plays a significant role in the properties and applications of Pickering emulsions. Oil-in-water (O/W) Pickering emulsions were prepared using spherical, rod-like, and thread-like mesoporous silica nanoparticles (MSNPs) in combination with the cationic surfactant dodecyl-trimethylammonium bromide (DTAB) as a stabilizer. The effects of nanoparticle morphology on the stability and stimuli-responsive properties of Pickering emulsions were investigated. For spherical and rod-like MSNP systems, stable Pickering emulsions were obtained at DTAB concentrations above 0.2 mmol.L-1. Stable Pickering emulsions containing thread-like MSNPs were produced at lower DTAB concentrations of approximately 0.1 mmol.L-1. The droplets with thread-like MSNPs were extremely large with an average diameter around 700 mu m at DTAB concentrations of 0.1-0.3 mmol.L-1, which were approximately 20 times larger than those of conventional droplets. Scanning electron microscopy (SEM) images showed that all three types of MSNPs were located at the O/W interfaces. Irrespective of the morphology of the MSNPs, all the stable Pickering emulsions retained their original appearance for more than 6 months. By adding NaOH and HCl alternatively, the Pickering emulsions containing spherical and rod-like MSNPs could be switched between unstable and stable states more than 60 times. The Pickering emulsions containing thread-like MSNPs, by contrast, could have their droplet size switched between large and small more than 10 times without any obvious phase separation. The high anisotropy of thread-like MSNPs contributed to the low interface curvature of the droplets. This study revealed the relationship between the morphology of MSNPs and the characteristics of Pickering emulsions. These results enrich our knowledge about the formulation of Pickering emulsions and expand their applications.

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