@article{mousavi_wang_grant_oxenham_hauser_2005, title={Measuring thermal degradation of a polyol ester lubricant in liquid phase}, volume={44}, ISSN={["0888-5885"]}, DOI={10.1021/ie049135u}, abstractNote={Thermal degradation of two polyol ester lubricants with the same base chemical structures from two different manufacturers at high temperature (i.e., 220 °C) has been studied. Gel permeation chromatography was used to identify the high molecular weight products formed during thermal stressing of these lubricants. The amount of high molecular weight products generated at different stages of the degradation (e.g., dimers, oligomers) was quantified. Several other techniques were utilized as a combined analytical approach to provide comprehensive measurement of lubricant degradation in the liquid phase. The mechanism of degradation and the formation of oxidation products have been presented. A significant difference in the extent of degradation of the two lubricants was observed using different analytical techniques.}, number={15}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Mousavi, P and Wang, DX and Grant, CS and Oxenham, W and Hauser, PJ}, year={2005}, month={Jul}, pages={5455–5464} }
 @article{wang_mousavi_hauser_oxenham_grant_2005, title={Quartz crystal microbalance in elevated temperature viscous liquids: Temperature effect compensation and lubricant degradation monitoring}, volume={268}, ISSN={["1873-4359"]}, DOI={10.1016/j.colsurfa.2005.05.075}, abstractNote={The quartz crystal microbalance (QCM) was extended to investigate viscous liquids at elevated temperatures in both isothermal and non-isothermal systems. An analysis of the frequency–temperature behavior of the QCM resulted in a new approach to compensate for the effect of the rate of temperature rise on the theoretical QCM temperature coefficients. The temperature-dependent viscosities of a series of liquids were evaluated by measuring the damping voltage of QCM. Thermal degradation experiments on pentaerythritol tetrapelargonate based lubricants demonstrated the potential application of QCM as an in situ sensor to evaluate the thermal stability of lubricants or other viscous fluids. The solid residue deposition rates and liquid phase property changes (i.e., product of density and viscosity) were extensively investigated by monitoring variations in the QCM frequency and damping voltage during the lubricant thermally stressing over a temperature range of 150–220 °C.}, number={1-3}, journal={COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS}, author={Wang, DX and Mousavi, P and Hauser, PJ and Oxenham, W and Grant, CS}, year={2005}, month={Oct}, pages={30–39} }
 @article{wang_mousavi_hauser_oxenham_grant_2004, title={Novel testing system for evaluating the thermal stability of polyol ester lubricants}, volume={43}, ISSN={["0888-5885"]}, DOI={10.1021/ie030782f}, abstractNote={This paper reports the development of a novel testing system for evaluating the thermal stability of polyol ester lubricants. The thermal degradation of three pentaerythritol tetrapelargonate based lubricants in the temperature range of 180−220 °C was studied using the developed comprehensive system. The system includes (1) a high-temperature quartz crystal microbalance for the real-time, in situ measurement of the solid residual deposition on metal surfaces and the viscosity change of thermally stressed liquid phase; (2) an on-line gas chromatograph for monitoring the volatiles generation in real time; and (3) an off-line gel permeation chromatograph for determining the molecular weight distribution of the liquid-phase products. The results indicate that the strategy can provide an integrated picture of the thermal stability of lubricants by providing quantitative, real-time, in situ information on gas-, liquid-, and solid-phase products during the thermal decomposition of the lubricants.}, number={21}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Wang, DX and Mousavi, P and Hauser, PJ and Oxenham, W and Grant, CS}, year={2004}, month={Oct}, pages={6638–6646} }