The influence of temperature on the lubricating properties of neat water for\ntribopairs with varying bulk elasticity moduli and surface hydrophilicity, namely\nhard-hydrophobic interface (h-HB), hard-hydrophilic interface (h-HL), soft-hydrophobic\ninterface (s-HB), and soft-hydrophilic interface (s-HL), has been investigated. With\nincreasing temperature, the coefficients of friction generally increased due to the decreasing\nviscosity of water. This change was more clearly manifested from soft interfaces for more\nfeasible formation of lubricating films. Nevertheless, dominant lubrication mechanism\nappears to be boundary and mixed lubrication even for soft interfaces at all speeds (up to\n1200 mm/s) and temperatures (1 to 90 �°C) investigated. The results from this study are\nexpected to provide a reference to explore the temperature-dependent tribological behavior\nof more complex aqueous lubricants, e.g., those involving various additives, for a variety\nof tribosystems.
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