Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/jamc/volume-2015/467242/figures/467242.fig.003a.svgz" name="467242.fig.003a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Oxygen content of elemental analysis</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/jamc/volume-2015/467242/figures/467242.fig.003b.svgz" name="467242.fig.003b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Surface oxygen element content</td></tr><tr class="fig-image" id="c"><td><object data="https://static-preview.hindawi.com/articles/jamc/volume-2015/467242/figures/467242.fig.003c.svgz" name="467242.fig.003c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Surface polar oxygen group content</td></tr></table>

<div>Curves of the relationship between oxygen contents and contact angles before and after deashing.</div>

Journal of Analytical Methods in Chemistry

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Figure 3

Figure 3: Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment 

Figure 3 | Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment 