This thesis explores the formation of deposition patterns in evaporating sessile suspension droplets, focusing on biological systems. Key investigations include the deposition patterns formed by motile Escherichia coli bacteria and collagen solution droplets. A custom experimental setup enabled controlled studies of evaporation-driven flow and deposit formation, revealing how varying bacterial density, swimming speed, and humidity influence deposition types. The research identified three distinct bacterial deposition patterns, described the mechanism of finger formation, and provided a model for the transitions between deposit types. The thesis also examined collagen deposits, highlighting how initial concentration and evaporation rates affect pattern formation. The findings offer insights into controlling bacterial and collagen deposition, with implications for various applications in biology and materials science.

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