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NMR of diffusion-free liquid particles at nanoscale resolution : sample…
NMR of diffusion-free liquid particles at nanoscale resolution : sample filling
Objective :
Trap water+fluorophore in nanowells ranging between 500 and 50nm diameters and etched at the diamond surface
Response :
Fluorescence signature
0 : No fluorescence within the array of nanowells
1 : Regular fluorescent pattern within the array
Factors :
Wetting (contact angle)
Surface wetting enhancement : oxygen plasma
Parameter : exposure duration [s]
Parameter : Power [W]
Wetting agent coated diamond surface :
Phospholipids monolayer (hydrophillic head/ hydrophobic end)
PEG thin films
alkyla phenol sulfanite
Parameter : film thickness [m]
Capping
Graphene + glass cap (immersion in water)
Glass cap (dry transfer)
Cleaning procedure
Ethanol + fuming nitric-acid
Degassing : Remove air bubbles when immerged in water
Model :
Empirical logistic model (sigmoïd fluorescence vs linear combination + interactions of factors)
Experimental design :
Considering 4 factors, if we take 2 levels per factor, a full factorial 2^4 = 16 experiments should be enough