1. Fig. 2 An illustration of physical models developed to study the stability and control of pointwise printing and their experimental verification.
An illustration of physical models developed to study the stability and control of pointwise printing and their experimental verification. (A) A simplified free-body diagram of a critical droplet at the edge of a structure and the illustration of a designed experiment to verify the models. (B) The predicted angle of growth as a function of droplet radius for different measured dried droplet heights. (C) The half-life time of the microdroplet was numerically calculated by evaporation rate estimation as a function of substrate temperature. (D) SEM images showing a series of inclined pillars fabricated at different angles to verify the model predictions. A magnified side view of the last inclined pillar establishes the critical angle (smallest angle to the horizontal for the assembled pillar by this method) at 37° that matches reasonably well with the model prediction. Scale bar, 250 μm.
Mohammad Sadeq Saleh et al. Sci Adv 2017;3:e
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