A series of new gemini surfactants without a spacer group, disodium2,3-dialkyl-1,2,3,4-butanetetracarboxylates, were synthesized in a green chemistry contextminimizing the use of organic solvents and applying microwaves (MW) when activationenergy was required. Once the desired architecture was confirmed by means of the nuclearmagnetic resonance technique (1H-NMR, 1H-1H COSY) for all the studied surfactants, thecritical micellization concentration was determined by conductance measurements. Thediffusion coefficient of micelles formed by the four compounds was characterized usingpulsed field gradient (PFG)-NMR. Diffusion coefficients were found to be dependent onthe concentration and on the number of carbon atoms in the alkyl chain. The absence of thespacer group, peculiar to this new series of gemini surfactants, may confer relatively lowflexibility to the molecules, with potential implications on the interfacial properties,namely on micellization. These gemini surfactants might have interesting applications in the preparation of composite materials, in nanotechnology, in gene transfection and mainly,due to the low CMCs, as new interesting ingredients of cosmetics and toiletries.
|Numero di pagine||14|
|Stato di pubblicazione||Published - 2013|
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