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A Surface Potential Study of Ion-Uptake by 5,11,17,23-Tetra-Tert-Butyl- 25,27-Diethoxycarbonyl Methyleneoxy-26,28,Dihydroxycalix[4]Arene and 5,17-(3-Nitrobenzylideneamino)-11,23-Di-Tert-Butyl-25,27- Diethoxycarbonyl Methyleneoxy-26,28-Dihydroxycalix[4]Arene Langmuir Blodgett (LB) Monolayers