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Note that the fluidic non-evaporating oil does not (or at least does not appear to be in my images) form contineous film on the hard heterogeneous hydrophobic surface. Rather, it forms isolated patches. I want to figure out a way to measure the thickness (particular, if in the range of 1 - 10 nm).
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Hi Stefan, Thanks for your message. I gave up using modulus to map the oil on my hard surface. However, I did find decent maps in both dissipation and deformation channels. Can I find any correlation between deformation and thickness of liquid film (< 10 nm)? Thanks! Zhi Li
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Hi Ang, Thank you for your answer. I hope I can explain better this time about what I am looking for. In my system, ~ 10 nm fluidic oil (olive oil alike) film is deposited on a hetrogeneniuos hydrophobic surface. I want to use AFM to map the oil film thickness using PeakForce QNM. I am uisng a soft tip (k ~0.4) and hoping the deformation value obtained
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Thanks! AFM in-air would be more idle for our purpose. If in fluid, oil might be dispersed into the fuild, or at least change its deposition morphology as to in air. I am guessing patches of soft & hydrophoic deposition formed on the hard substrate. I tried both scanayst using soft tip and tapping mode, but could not find out any consistent indication
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I am trying to image oil deposition on surface using our AFM (an Icon system with Peak Force QNM). I am expecting thin film or small droplets formed on the surface. The oil is a hydrophobic small molecular weight ester (very soft). The substrate is fairly hard (modulus close to polystyrene) Does any of you have any suggestion about particular AFM mode