However, in the case of candle soot coated on a negative surface (∼139–148°), an increasing trend for the contact angle was found with an increase in temperature.
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Tunable surface adsorption and wettability of candle soot coated on ferroelectric ceramics.
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The sentences
In the case of candle soot coated on a positive surface, a decreasing trend for the contact angle (∼148–134°) was found with an increase in temperature (30–70 °C).