please Change the following sentence：The three-phase contact angle θow of colloidal particles was characterized by an OCA 20 AMP Dataphysics Instruments GmbH Germany The ZTCNP powders were prepared as

An OCA 20 AMP (Dataphysics Instruments GmbH, Germany) was used to characterize the three-phase contact angle (θow) of colloidal particles. Pellets of ZTCNP powders were prepared, measuring 13 mm in diameter and 2 mm in thickness, and placed into an optical glass cuvette filled with purified sunflower oil. Using a high-precision injector, a 5 μL drop of Millipore water was deposited onto the pellet surface. A high-speed video camera was used to capture an image of the drop, which was then analyzed using the Laplace-Young equation to determine its profile