INQUISUR 21779
INSTITUTO DE QUIMICA DEL SUR
Unidad Ejecutora - UE
artículos
Título:
Ca2+- and Mg2+-induced molecular interactions in a dehydrocholic acid/didodecyldimethylammonium bromide mixed monolayer
Autor/es:
PAULA V. MESSINA , JUAN MANUEL RUSO , GERARDO PRIETO, MARCOS D. FERNÁNDEZ-LEYES, PABLO C. SCHULZ, FÉLIX SARMIENTO
Revista:
COLLOID AND POLYMER SCIENCE
Editorial:
Springer
Referencias:
Año: 2010 vol. 288 p. 449 - 459
ISSN:
0303-402X
Resumen:
<!--
/* Font Definitions */
@font-face
{font-family:AdvTT3713a231;
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:0;
mso-generic-font-family:roman;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:3 0 0 0 1 0;}
@font-face
{font-family:AdvTT3713a231+03;
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:3 0 0 0 1 0;}
@font-face
{font-family:"AdvTT50a2f13e\.I";
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:0;
mso-generic-font-family:swiss;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:3 0 0 0 1 0;}
@font-face
{font-family:"AdvTT50a2f13e\.I+03";
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:3 0 0 0 1 0;}
@font-face
{font-family:AdvTT3713a231+22;
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:3 0 0 0 1 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0cm;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";
mso-ansi-language:EN-US;}
@page Section1
{size:595.3pt 841.9pt;
margin:70.85pt 3.0cm 70.85pt 3.0cm;
mso-header-margin:35.4pt;
mso-footer-margin:35.4pt;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
The aim of this article is
the evaluation of Ca2+ and Mg2+ subphases presence effect on mixed monolayers composed
by dehydrocholic acid (HDHC) and idodecyldimethylammonium bromide (DDAB). The
monolayer stability was analyzed y the evaluation of thermodynamic prameters, ΔGmix E and α. At all calcium ion-tested
concentration, the mixed
systems XHDHC=0.6 and 0.8 at π=30 mJ m−2 were
always the most favored proportions. The XHDHC=0.6 system was also stable in magnesium presence,
and the XHDHC=0.2-mixed monolayer went through a stable to an
unstable state as the content of Ca2+ or Mg2+ augment. Finally, the XHDHC=0.4
monolayer showed a particular behavior, i.e., remained stable at low cation concentration,
unstable at intermediate concentration and stable again at high concentration.
The effect was similar at Mg2+ presence
