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Hop on board: The authors present experimental evidence of particle trains in viscoelastic polymer solutions. It turns out that such lines of particles in viscoelastic liquids are easy to produce, prompting future applications in biomedical engineering and materials science---for example, in optimized flow cytometry, deterministic cell encapsulation and microfluidic fabrication of materials with enhanced localized properties. Also, the simple setup here can be coupled with other microfluidic techniques, to clarify the hydrodynamic interactions between particles.
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Giudice et al. (2018) studied this question.
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