Table 1: Chemical composition (atomic %) of samples (Mean ± SD); n=3, duplicated.

Elements Brand X Brand Y
Carbon 8.32 ± 2.92 3.94 ± 4.43
Oxygen 42.59 ± 9.37 20.71 ± 19.30
Titanium 48.94 ± 8.92 66.325 ± 14.94
Aluminum 0 6.03 ± 1.35
Vanadium 0 2.99 ± 0.79