INVESTIGADORES
VERDINELLI Valeria
artículos
Título:
THE EFFECT OF THE HYDROCARBON-WATER INTERFACE STRUCTURE ON THE BEHAVIOR OF AN EMULSION STABILIZED WITH DODECANEPHOSPOHONIC ACID
Autor/es:
VALERIA VERDINELLI, PAULA V MESSINA, EDUARDO N SCHULZ, DANIEL SALINAS, BRUNO VUANO, PABLO C. SCHULZ
Revista:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010 vol. 367 p. 1 - 6
ISSN:
0927-7757
Resumen:
We studied the phase transition of petroleum ether/water/n-dodecanephosphonic acid (DPA) from W/O to W/O/W emulsion when the neutralization degree (nd) of dodecane phosphonic acid (DPA) with NaOH was changed. We concluded that a phase transition from W/O emulsion to W/O/W emulsion occurs when nd=0.47 due to a change in the structure of the polar layer at the oil/water interface from a tightly hydrogen-bonded layer to a less compact layer formed by -PO3H2 and -PO3H- groups in favor of an inversion. The W/O/W emulsion is probably caused by a partition of acid molecules in the water droplets interface inside the oil droplets, and monosodium phosphonate molecules at the external interface of oil droplets.
