<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2003000100007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Vane rheometry of an aqueous solution of worm-like micelles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rolón-Garrido]]></surname>
<given-names><![CDATA[V.H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-González]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega Acosta Montalban]]></surname>
<given-names><![CDATA[L.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Departamento de Física]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<volume>49</volume>
<numero>1</numero>
<fpage>40</fpage>
<lpage>44</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2003000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2003000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2003000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The non-linear viscoelastic behavior of worm-like micelles in aqueous solution was analyzed in this work under non-homogeneous flow with a rotational vane rheometer. The system studied was a solution of cetylpyridinium chloride 100 mM/sodium salicylate 60 mM (CPyCl/NaSal) in triple distilled water. The use of the vane rheometer enables to reach higher shear rates than a cone and plate or Couette one because ejection of the sample and slip at the rotating surface are restricted. Thus, following this experimental procedure we show in this work, the complete flow curve for a micellar solution, including a hysteresis cycle and the upturn at high shear rates predicted by theories on constitutive instabilities and shear banded flow. We show in addition, the influence of time on the onset of flow instabilities and an experimental analysis of the flow stability in the low and high shear rate branches.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El comportamiento viscoelástico no lineal de micelas tipo gusano en solución acuosa bajo flujo no homogéneo fue analizado en este trabajo mediante un reómetro rotacional de paletas. El sistema estudiado fue una solución de cetilpiridinio 100 mM/ salicilato de sodio 60 mM (CPyCl/NaSal) en agua tridestilada. El uso del reómetro de paletas permite alcanzar razones de deformación mayores que las obtenibles en cono y plato o Couette, ya que la expulsión de la muestra y el deslizamiento en la superficie giratoria están restringidas. Así, siguiendo este procedimiento experimental mostramos en este trabajo, la curva de flujo completa para un sistema micelar, incluyendo un ciclo de histéresis y el ascenso a altas razones de corte predicho por las teorías sobre inestabilidades constitutivas y flujo en bandas. Mostramos además, la influencia del tiempo sobre la aparición de inestabilidades de flujo y presentamos un análisis experimental de la estabilidad de flujo en los regímenes de baja y alta rapidez de deformación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Vane rheometry]]></kwd>
<kwd lng="en"><![CDATA[micellar solutions]]></kwd>
<kwd lng="en"><![CDATA[flow instabilities]]></kwd>
<kwd lng="en"><![CDATA[top and bottom jumping]]></kwd>
<kwd lng="es"><![CDATA[Reometría de paletas]]></kwd>
<kwd lng="es"><![CDATA[soluciones micelares]]></kwd>
<kwd lng="es"><![CDATA[inestabilidades de flujo]]></kwd>
<kwd lng="es"><![CDATA[saltos superior e inferior]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Vane rheometry of an aqueous solution of worm&#45;like micelles</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>V.H. Rol&oacute;n&#45;Garrido, J. P&eacute;rez&#45;Gonz&aacute;lez and L.A. Vega Acosta Montalban</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Laboratorio de Reolog&iacute;a, Departamento de F&iacute;sica, Escuela Superior de F&iacute;sica y Matem&aacute;ticas,</i> <i>Instituto Polit&eacute;cnico Nacional, Apartado Postal 75&#45;685, C. P. 07300, M&eacute;xico D.F.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 12 de junio de 2002.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 17 de septiembre de 2002.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The non&#45;linear viscoelastic behavior of worm&#45;like micelles in aqueous solution was analyzed in this work under non&#45;homogeneous flow with a rotational vane rheometer. The system studied was a solution of cetylpyridinium chloride 100 mM/sodium salicylate 60 mM (CPyCl/NaSal) in triple distilled water. The use of the vane rheometer enables to reach higher shear rates than a cone and plate or Couette one because ejection of the sample and slip at the rotating surface are restricted. Thus, following this experimental procedure we show in this work, the complete flow curve for a micellar solution, including a hysteresis cycle and the upturn at high shear rates predicted by theories on constitutive instabilities and shear banded flow. We show in addition, the influence of time on the onset of flow instabilities and an experimental analysis of the flow stability in the low and high shear rate branches.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Vane rheometry; micellar solutions; flow instabilities; top and bottom jumping.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El comportamiento viscoel&aacute;stico no lineal de micelas tipo gusano en soluci&oacute;n acuosa bajo flujo no homog&eacute;neo fue analizado en este trabajo mediante un re&oacute;metro rotacional de paletas. El sistema estudiado fue una soluci&oacute;n de cetilpiridinio 100 mM/ salicilato de sodio 60 mM (CPyCl/NaSal) en agua tridestilada. El uso del re&oacute;metro de paletas permite alcanzar razones de deformaci&oacute;n mayores que las obtenibles en cono y plato o Couette, ya que la expulsi&oacute;n de la muestra y el deslizamiento en la superficie giratoria est&aacute;n restringidas. As&iacute;, siguiendo este procedimiento experimental mostramos en este trabajo, la curva de flujo completa para un sistema micelar, incluyendo un ciclo de hist&eacute;resis y el ascenso a altas razones de corte predicho por las teor&iacute;as sobre inestabilidades constitutivas y flujo en bandas. Mostramos adem&aacute;s, la influencia del tiempo sobre la aparici&oacute;n de inestabilidades de flujo y presentamos un an&aacute;lisis experimental de la estabilidad de flujo en los reg&iacute;menes de baja y alta rapidez de deformaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Reometr&iacute;a de paletas; soluciones micelares; inestabilidades de flujo; saltos superior e inferior.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 83.85.Cg; 83.60.Wc; 83.80.Qr</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="../pdf/rmf/v49n1/v49n1a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>  	    <p align="justify"><font face="verdana" size="2">This work was supported by CGPI&#45;IPN (010565) and CONACyT (34971&#45;U). J.P&#45;G and L.A.V.A.M. are COFFA&#45;EDI fellows. V.H.R.G. has scholarships from PIFI&#45;IPN and CONACyT.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;N.A. Spenley Yuan X.F., and M.E. Cates, <i>J.Phys. II</i> <b>6</b> (1996) 551.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8292801&pid=S0035-001X200300010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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