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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 16: 1721 - 1724

DOI: https://doi.org/10.6023/A12040163

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Preparation of Colloidosome Microcapsules Based on Particle Stabilized Photo-Crosslinkable Pickering Emulsions

  • Wang Chaoyang ,
  • Ning Yin ,
  • Chen Yunhua ,
  • Tong Zhen
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  • Research Institute of Materials Science, South China University of Technology, Guangzhou 510640

Received date: 2012-05-01

  Online published: 2012-07-02

Supported by

Project supported by the National Basic Research Program of China (973 Program, No. 2012CB821500), the National Natural Science Foundation of China (No. 50973034) and the Fundamental Research Funds for the Central Universities.

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Abstract

In this work, we studied the preparation and emulsification behavior of nanoparticles with photo-sensitive polymer brushes and presented a method for the preparation of novel colloidosome microcapsules based on single Pickering emulsion template, which is stabilized by surface-modified silica nanoparticles with photodimerizable coumarin group. Firstly, silica nanoparticles were self-made by using a stöber method with a diameter of about 180 nm, following aminated by 3-aminopropyltriethoxysilane (APS) and further modified by 2-bromo-2-methylpropionyl bromide, endowing these nanoparticles with ATRP-initiator reactive group. After that, silica nanoparticles with photo-sensitive polymer brushes (SiO2- PMMA-PCMA) were obtained through graft reaction of methyl methacrylate (MMA) and 7-(2-methacryloyloxyethoxy)-4-methylcoumarin (CMA) monomers (with a molar fraction of 4∶1) onto silica nanoparticles by surface-initiated atom transfer radical polymerization (SI-ATRP) method. Here, CMA was synthesized via a two-step method and was detected by UV-visible spectrophotometer. Secondly, the as-prepared hydrophobic SiO2-PMMA-PCMA nanoparticles were dispersed in 2 mL of toluene with a ultrasonic for 5 min (with an interval of 30 s per min), then 0.5 mL of deionized water was rapidly added, afterwards, water-in-oil type Pickering emulsions were prepared by hand-shake for 3 min. Finally, colloidosome microcapsules were produced through cross-linking reaction of the coumarin group of CMA initiated by UV irradiation, in this step, the SiO2-PMMA-PCMA nanoparticles were locked. The average size and size distribution of as-synthesized Pickering emulsion droplets and colloidosomes were observed with an optical microscope. The results show that both CMA and SiO2-PMMA-PCMA nanoparticles can be initiated to cross-link through the dimerization of the coumarin groups of CMA from different SiO2-PMMA-PCMA nanoparticles via UV irradiation, the dimerization rate of CMA reached about 80% in 6 min and the UV absorption peak of coumarin group of SiO2-PMMA-PCMA nanoparticles was blue-shifted. Besides, the Pickering emulsion droplets can be stored for a long time without breaking up and the average size of as-produced colloidosome microcapsules were about 170 μm. In theory, this method can be scaled up to produce large quantity of colloidosomes.

Key words： colloidosomes; Pickering emulsions; SI-ATRP; polymer brushes; photo-crosslinkable

Cite this article

Wang Chaoyang , Ning Yin , Chen Yunhua , Tong Zhen . Preparation of Colloidosome Microcapsules Based on Particle Stabilized Photo-Crosslinkable Pickering Emulsions[J]. Acta Chimica Sinica, 2012 , 70(16) : 1721 -1724 . DOI: 10.6023/A12040163

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