Theoretical Characterization And Algorithm Of Reactive Wetting Dynamics

The law of dynamics in reactive wetting is a distinctly important scientific problem in solid liquid interface reaction. This important physical chemistry phenomenon decides the possibility of material preparation and usability. This article studied the variation of energy and based on the energy relationship at on-equilibrium state, a reactive wetting dynamics model has been built which object of study is solid-liquid interfacial energy. By using Dispensed Drop Method, Sessile Drop Method, X ray diffracmeter et al, researched the experiment of Hg wetting on Ag substrate at room temperature and the experiment of Ag-Ti alloy wetting on Al2O3 ceramic substrate in high temperature which try to verify the dynamics model in reactive wetting experiment in room temperature and high temperature.Studied on the law of dynamics in the experiment of Hg wetting on Ag substrate, we find when the thickness of silver is micron order the relation between logarithm of solid-liquid interfacial energy is consistent with the interfacial energy dynamics model in 0-150s, and the relation between contact angle and time is consistent with diffusion-limited model in 150-600s.So we can believe that the control mechanism of the process of reactive wetting will change from chemical reaction control to diffusion control. When the the thickness of silver is millimeter the relation between logarithm of solid-liquid interfacial energy is consistent with the interfacial energy dynamics model in 20-300s, and the relation between contact angle and time is consistent with-limited model in 0-20s. So we can draw the conclusion that the control mechanism of the process of reactive wetting will change from viscous dissipation control to chemical reaction control.Studied on the law of dynamics in the experiment of Ag-Ti alloy wetting on Al2O3 ceramic substrate, we find when the content of Ti is changed in 1%,2%,3%, the final contact angle in Ag-Ti alloy wetting on Al2O3 ceramic substrate is 90.27°,85.59° and 78.48°, the wettability is improve when the the content of Ti increased. The experiment of Ag-Ti alloy wetting on Al2O3 ceramic substrate in different content of Ti then find the relation between logarithm of solid-liquid interfacial energy is all consistent with the interfacial energy dynamics model in the earlier stage. The variation of Ti will make dynamics constant k exist multiple relation,which indicatedthe dynamics constant is related to the concentration of reaction element.Synthesize the above research results, the conclusion shows that reactive wetting experiment in room temperature and high temperature all conform to the law of the interfacial energy dynamics model, and because of one wetting dynamics model could not analyze the whole process of reactive wetting, we will use other dynamics models as supplement. The reactive solid-liquid interfacial energy difference between the initial and final reaction provides the driving force for wetting, which could uncover the relationship between interfacial energy and wettability.