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Self-Assembly of Synthetic and Biological Polymeric Systems of ...

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on the digital pr<strong>of</strong>ile <strong>of</strong> a drop image <strong>and</strong> the resolution <strong>of</strong> the Gauss-Laplace equation. Win<br />

Drop s<strong>of</strong>tware (I.T. Concept, France) was used to obtain the surface tension values by means <strong>of</strong><br />

the axisymetric drop shape analysis. For air-water interface, an air-bubble upward was formed<br />

at the tip <strong>of</strong> a U-shaped stainless steel needle (0.5 mm inner diameter) immersed in water bulk<br />

phase. On the contrary, chlor<strong>of</strong>orm bubble downward was formed at the tip <strong>of</strong> a straight<br />

stainless steel needle (0.5 mm inner diameter).<br />

Langmuir-Blodgett trough. Surface-pressure isotherms were recorded in a Langmuir-Blodgett<br />

(LB) Teflon trough (model 611 from Nima Technologies, Ltc., Coventry, U.K.).<br />

Atomic force microscopy. The AFM measurements were performed in a JEOl instruments<br />

(model JSPM-4210) in non-contact mode using nitride cantilevers NSC 15 from Micro Masch,<br />

USA (typical working frequency <strong>and</strong> spring constant <strong>of</strong> 325 kHz <strong>and</strong> 40 N/m, respectively).<br />

83

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