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Microfluidic particle focusing has been a vital prerequisite step in sample preparation for downstream particle separation, counting, detection, or analysis, and has attracted broad applications in biomedical and chemical areas. Besides all the active and passive focusing methods in Newtonian fluids, particle focusing in viscoelastic fluids has been attracting increasing interest because of its advantages...
DOI: 10.1002/elps.202100126
The cover picture shows a sheathless three‐dimensional viscoelastic focusing of white blood cells, red blood cells, and cancer cells in a zigzag microchannel. Cell focusing is essential for the downstream cell separation, detection, counting or analysis. In general, an extended channel length is required to achieve efficient focusing, which would result in the size increase...