期刊
SOFT MATTER
卷 17, 期 19, 页码 5006-5017出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sm00125f
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类别
资金
- Polish National Science Centre through the OPUS program [2015/19/B/ST3/03055]
- Polish National Science Centre through the PRELUDIUM program [2019/35/N/ST5/02821]
- European Union's Horizon 2020 Research and Innovation Programme under Marie Sklodowska-Curie Grant [752896]
- Research Council of Norway [262644]
- Marie Curie Actions (MSCA) [752896] Funding Source: Marie Curie Actions (MSCA)
The study focuses on the deformation and yielding behavior of non-spherical Pickering droplets with arrested particle shells subjected to compressive stress, achieved by applying electric fields. The experimental results show that more aspherical droplets and/or droplets covered with larger particle shells require higher electric stress for deformation and yielding. Particle shells may fail through various crumpling instabilities, including ridge formation, folding, wrinkling, and inward indentation.
Droplets covered with densely packed solid particles, often called Pickering droplets, are used in a variety of fundamental studies and practical applications. For many applications, it is essential to understand the mechanics of such particle-laden droplets subjected to external stresses. Several research groups have studied theoretically and experimentally the deformation, relaxation, rotation, and stability of Pickering droplets. Most of the research concerns spherical Pickering droplets. However, little is known about non-spherical Pickering droplets with arrested particle shells subjected to compressive stress. The experimental results presented here contribute to filling this gap in research. We deform arrested non-spherical Pickering droplets by subjecting them to electric fields, and study the effect of droplet geometry and size, as well as particle size and electric field strength, on the deformation and yielding of arrested non-spherical Pickering droplets. We explain why a more aspherical droplet and/or a droplet covered with a shell made of larger particles required higher electric stress to deform and yield. We also show that an armored droplet can absorb the electric stress differently (i.e., through either in-plane or out-of-plane particle rearrangements) depending on the strength of the applied electric field. Furthermore, we demonstrate that particle shells may fail through various crumpling instabilities, including ridge formation, folding, and wrinkling, as well as inward indentation.
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