Effect of Water Structure on the Formation of Coagels from Ascorbyl-Alkanoates

SANTIAGO PALMA,; RUBEN MANZO,; DANIEL ALBERTO ALLEMANDI; LAURA FRATONI,; LO NOSTRO, PIERANDREA

LANGMUIR

ACS

Año: 2003 vol. 19 p. 3222 - 3222

0743-7463

span lang="en" style="FONT-SIZE: 8pt; COLOR: black; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ES; mso-bidi-language: AR-SA">Ascorbyl-alkanoates (ascorbyl-O-CO-(CH2)n-2CH3,in brief, ASCn) behave as anionic surfactants. They form coagels in aqueous dispersions at room temperature. On heating, these hydrated crystalline phases transform into either micellar solutions or gel phases, depending on the hydrophobic chain length. The different phase behavior reflects the interplay between the interactions that involve the ionic headgroups and water, and those between the hydrophobic chains. Solute induced modification of water structure might then be expected to induce significant changes in the coagel-to-gel or coagel-to-micelle phase transitions. Such effects, induced by suc