In this work, we have presented a planar passive mixer with a logarithmic spiral geometry. The logarithmic curves can be sequentially arranged to additively increase mixing, thus the design is termed a Sequential Logarithmic Mixing Apparatus, or SeLMA. Its planar design allows "one-step" fabrication using traditional photolithography techniques. SeLMA lacks obstructions, cavities, or sharp corners that could potentially hold up or damage sensitive biological samples. The combination of these features caused advection that dispersed the sheath and sample fluid amongst one another. This dispersion was larger at higher flow rates, which yielded higher mixing performance.
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