Bespoke Diblock Copolymer Nanoparticles Enable the Production of Relatively Stable Oil-in-Water Pickering Nanoemulsions

被引:43
作者
Thompson, Kate L. [1 ]
Cinotti, Natacha [1 ]
Jones, Elizabeth R. [1 ]
Mable, Charlotte J. [1 ]
Fowler, Patrick W. [1 ]
Armes, Steven P. [1 ]
机构
[1] Univ Sheffield, Dept Chem, Dainton Bldg,Brook Hill, Sheffield S3 7HF, S Yorkshire, England
基金
英国工程与自然科学研究理事会;
关键词
AQUEOUS EMULSION POLYMERIZATION; INVERSION TEMPERATURE METHOD; NANO-EMULSIONS; DISPERSION POLYMERIZATION; CONSTANT-TEMPERATURE; SILICA NANOPARTICLES; LATEX-PARTICLES; COLLOIDOSOMES; STABILITY; MORPHOLOGIES;
D O I
10.1021/acs.langmuir.7b02267
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Sterically stabilized diblock copolymer nano particles with an intensity-average diameter of 25 nm are prepared in the form of a concentrated aqueous dispersion using polymerization-induced self-assembly (PISA). The addition of n-dodecane followed by high-shear homogenization produces n-dodecane-in-water Pickering macroemulsions of 22-46 mu m diameter. If the nanoparticles are present in sufficient excess, then subsequent processing using a high-pressure microfluidizer leads to the formation of Pickering nanoemulsions with a mean oil droplet diameter below 200 nm. The size of these Pickering nanoemulsions can be tuned by systematically varying the nanoparticle concentration, applied pressure, number of passes, and oil volume fraction. High-internal phase emulsions can also be achieved by increasing the n-dodecane volume fraction up to 0.80. TEM studies of (dried) n-dodecane droplets confirm the presence of intact nanoparticles and suggest a relatively high surface coverage, which is consistent with model packing calculations based on radius ratios. Such Pickering nanoemulsions proved to be surprisingly stable with respect to Ostwald ripening, with no significant change in the mean DLS droplet diameter after storage for approximately 4 months at 20 degrees C.
引用
收藏
页码:12616 / 12623
页数:8
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