<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532018000400153</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v85n207.71804</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reduction of heavy oil viscosity through ultrasound cavitation assisted by NiO nanocrystals-functionalized SiO2 nanoparticles]]></article-title>
<article-title xml:lang="es"><![CDATA[Reducción de la viscosidad de crudos pesados mediante cavitación por ultrasonido asistida por nanopartículas de SiO2 funcionalizadas con nanocristales de NiO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montes]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés]]></surname>
<given-names><![CDATA[Farid B]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco]]></surname>
<given-names><![CDATA[Camilo A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Minas Grupo de Investigación Fenómenos de Superficie - Michael Polanyi]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>85</volume>
<numero>207</numero>
<fpage>153</fpage>
<lpage>160</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532018000400153&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532018000400153&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532018000400153&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this study is to reduce heavy oil viscosity through the catalytic decomposition of heavy fractions by ultrasound cavitation using metal oxide nanoparticles and water as a hydrogen donor, leading to the reduction of asphaltene content through its conversion into lighter components. NiO nanoparticles were synthesized over a 7 nm silica support using the incipient wetness technique. Emulsified heavy oil (HO) with 40%v/v of water and 13°API was used to evaluate the ultrasound cavitation process over different exposure times and nanoparticle dosages. The viscosity of the emulsified HO before and after ultrasound cavitation was measured with and without nanoparticles. Significant viscosity reduction was obtained, showing best results at 90 minutes of ultrasound exposure time with a nanoparticle dosage of 2000 mg/L, leading to a viscosity reduction at 10 s-1 and 25°C, and an asphaltene content reduction of 44 and 16%, respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este estudio es la reducción de viscosidad de crudos extra-pesados mediante la descomposición catalítica de las fracciones pesadas del crudo y su conversión en sub-compuestos más livianos utilizando cavitación por ultrasonido asistida por nanopartículas. Nanopartículas de NiO fueron sintetizadas sobre sílice nanoparticulada de 7 nm usando la técnica de impregnación incipiente. Un crudo emulsionado con un contenido aproximado de 40%v/v de agua y 13°API fue usado para evaluar el proceso de cavitación aplicando distintos tiempos de exposición y dosificaciones de nanopartículas. La viscosidad del crudo a 10 s-1 y 25°C fue medida antes y después del tratamiento en ausencia y presencia de nanopartículas. Los mejores resultados observados fueron a un tiempo de exposición de 90 minutos con una dosificación de nanopartículas de 2000 mg/L, generando reducciones de viscosidad y en el contenido de asfaltenos del 44 y 16%, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[asphaltenes]]></kwd>
<kwd lng="en"><![CDATA[heavy oil]]></kwd>
<kwd lng="en"><![CDATA[nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[ultrasound cavitation]]></kwd>
<kwd lng="en"><![CDATA[viscosity]]></kwd>
<kwd lng="es"><![CDATA[asfaltenos]]></kwd>
<kwd lng="es"><![CDATA[cavitación por ultrasonido]]></kwd>
<kwd lng="es"><![CDATA[crudo pesado]]></kwd>
<kwd lng="es"><![CDATA[nanopartículas]]></kwd>
<kwd lng="es"><![CDATA[viscosidad]]></kwd>
</kwd-group>
</article-meta>
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