Fig. 2
From: Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13018-020-01949-3/MediaObjects/13018_2020_1949_Fig2_HTML.png)
Increased hydrophilicity of the HA surface after UV irradiation as evaluated by measurement of the water-drop contact angle. Photographs show a drop of water deposited onto 0% and 55% porosity HA disks