Contact Angle Measurements
Contact angle measurement quantifies the wettability of a solid surface by placing a liquid droplet on it and measuring the angle formed at the three-phase contact line, yielding information about surface energy and hydrophilicity. As a hard skill it requires preparing clean, representative surfaces, using a goniometer or optical tensiometer correctly, and selecting the appropriate analysis method — sessile drop, advancing/receding — for the application. Battery researchers apply contact angle measurements to evaluate electrode and separator wettability by electrolyte, where poor wetting leads to incomplete pore filling and degraded rate performance.
