Abstract

Optical, DSC and X-ray studies show that Cn H2n+1, O Cm H2m OH (n=16; m=4; n=18 and 20, m= 2 and 3; n = 22, m=3)/aqueous H3 PO4 systems exhibit mesophases in the order middle - viscous isotropic - lamellar - gel. The low temperature gel displays characteristically the chevron pattern due to an undulation instability of bilayers; it is possibly caused by hydrocarbon chain elongation and stiffening.

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