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Electrochemical and Raman observations show synergistic inhibition of phytic acid and I− for copper from corrosion in acid solution.

The combination of hydroxyapatite composite powder and three-dimensional (3D) printing rapid prototyping techniques has markedly improved skeletal interactions in orthopedic surgery applications. 3D printing methodology ensures effective bionic microstructure and shape interactions between an implant and the surrounding normal tissue. In effort to enhance the quality, precision, and mechanical properties of printed bone scaffolds, this study examines binder droplet spreading performance on the surface of hydroxyapatite (HA) microspheres. The piezoelectric nozzle diameter is about 10 lm, which sprays droplets 20 lm in diameter. The average size of HA powder particles is about 60 lm in diameter. Most laboratories, however, are limited to observation of a single droplet 20 lm or smaller in diameter impacting a spherical surface 60 lm in diameter. Based on non-dimensional scale similarity theory in axisymmetric Stokes flow dynamics, this study conducted experiments and simulation on the same collision conditions (droplet 200 lm in diameter, spherical surface 600 lm in diameter). Simulation results were consistent with experiment data, and form a basis for future research on modeling droplet impact on spherical surfaces.