<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082018000100041</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.543</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Experimental study of nanobubbles in salt solutions]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio experimental de nanoburbujas en soluciones salinas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sjogreen]]></surname>
<given-names><![CDATA[Carlos Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Landínez-Téllez]]></surname>
<given-names><![CDATA[David A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas-Pérez]]></surname>
<given-names><![CDATA[Jaiver Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plazas-Hurtado]]></surname>
<given-names><![CDATA[Paulo César]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roa-Rojas]]></surname>
<given-names><![CDATA[Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Física Grupo de Física de Nuevos Materiales]]></institution>
<addr-line><![CDATA[Bogotá D.C.]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Farmacia Grupo de Síntesis y Aplicación de Moléculas Peptídicas]]></institution>
<addr-line><![CDATA[Bogotá D.C.]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Farmacia Grupo de Sistemas para Liberación Controlada de Moléculas Biológicamente Activas]]></institution>
<addr-line><![CDATA[Bogotá D.C.]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<volume>42</volume>
<numero>162</numero>
<fpage>41</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082018000100041&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The characterization of oxygen nanobubbles in NaCl solutions has been performed in order to study the variation of their size, concentration, pH, temperature and aggregation levels, through oxygen saturation and cavitation processes for different times. The nanobubbles were produced by the injection of oxygen by rotation to the saline solution in a diffusive medium, at constant temperature, in the way of searching for a solution with homogeneous distribution. The solution finally obtained was subjected to several tests at different times to observe changes in the nanobubbles. The size characterization of nanobubbles in the solution was performed using the dynamic light scattering technique. The concentration of the solution was determined by a semi-quantitative process taking into account the concentration of standard particles and the counting rate per second of the device. Potential &#950; was measured in order to establish the aggregation and stability levels of the nanobubbles at different temperatures and pHs. At a temperature T=4  o C the diameter of the nanobubbles remains approximately constant in time (1000 to 2000 nm), regardless of the pH values, and the highest stability of nanobubbles is reached.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La caracterización de nanoburbujas de oxígeno en soluciones de NaCl ha sido efectuda con el objeto de estudiar la variación de su tamaño, concentración, pH, temperatura y niveles de agregación, a través de procesos de saturación de oxígeno y cavitación para diferentes tiempos. Las nanoburbujas fueron producidas mediante la inyección de oxígeno por rotación a la solución salina en un medio difusivo, a temperatura constante, en la procura de una solución con distribución homogénea. La solución finalmente obtenida fue sometida a varias pruebas, a varios tiempos diferentes, para observar los cambios en las nanoburbujas. La caracterización del tamaño de las nanoburbujas en la solución fue llevada a cabo utilizando la técnica de dispersión dinámica de la luz. La concentración de la solución se determinó mediante un proceso semicuantitativo teniendo en cuenta la concentración de partículas estándar y la tasa de conteo por segundo del dispositivo. Se midió el potencial &#950; para establecer los niveles de agregación y estabilidad de las nanoburbujas a diferentes temperaturas y pH. A una temperatura T=4  o C, se observó que el diámetro de las nanoburbujas permanece aproximadamente constante en el tiempo (1000 to 2000 nm), independientemente de los valores de pH, alcanzándose la mayor estabilidad de las nanoburbujas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Nanobubbles]]></kwd>
<kwd lng="en"><![CDATA[Production]]></kwd>
<kwd lng="en"><![CDATA[Characterization]]></kwd>
<kwd lng="en"><![CDATA[Critical diameter]]></kwd>
<kwd lng="en"><![CDATA[Stability.]]></kwd>
<kwd lng="es"><![CDATA[Nanoburbujas]]></kwd>
<kwd lng="es"><![CDATA[Producción]]></kwd>
<kwd lng="es"><![CDATA[Caracterización]]></kwd>
<kwd lng="es"><![CDATA[Diámetro crítico]]></kwd>
<kwd lng="es"><![CDATA[Estabilidad.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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