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SAMs(Self Assembly Monolayers) - Contact Angle
purpose of the experiment
To understanding the contact angle through the SAMs.
principle of the experiment
A contact angle of a droplet on a surface reflects the balance of interfacial free energy between three interacting phases, the substrate, the liquid and air.
γSV is the interfacial free energy between solid and vapor.
γSL is the interfacial free energy between solid and liquid.
γLV is the interfacial free energy between liquid and vapor.
θc is the equilibrium contact angle.
how to do the experiment
Washing the substrate(silicon thin film) by Piranha method. The result of this process is to get the coated thin film with oxide. And then, we were coating with APS(AminoPropyltriethoxySilane) on the film.