<?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>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822021000200096</article-id>
<article-id pub-id-type="doi">10.18845/tm.v34i2.5010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio fotoacústico de nanopartículas de oro por ablación láser]]></article-title>
<article-title xml:lang="en"><![CDATA[Photoacustic study of gold nanoparticles by laser ablation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Esteban]]></surname>
<given-names><![CDATA[Jesús Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivas-Alvarez]]></surname>
<given-names><![CDATA[Agustin Benigno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de Tayacaja  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Perú</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de Tayacaja Daniel Hernández Morillo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Perú</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>2</numero>
<fpage>96</fpage>
<lpage>108</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822021000200096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822021000200096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822021000200096&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la presente tesis se investigó el cambio de morfología y tamaño de las nanopartículas de oro obtenidos por ablación láser, con diferentes métodos de reconfiguración. En el caso del oro, el blanco fue ablacionado con un láser pulsado de Nd: YAG, (1064 nm, 37.48 mJ/p, 10 Hz, durante 10 minutos), los espectros de absorción presentan un solo máximo de absorción a 521 nm característica de las nanopartículas esféricas de oro. Se aplicó la técnica PLI a los coloides con pulsos láser de 532 nm de longitud de onda, 25.8 mJ de energía durante 6 minutos. El análisis por dispersión dinámica de la luz (DLS) mostró que las NpsAu con PLI fueron de 21 nm de diámetro, además, se comprobó que la amplitud de la señal fotoacústica está relacionada directa y proporcionalmente con la concentración de NpsAu en el coloide evidenciando que a mayor concentración la respuesta fotoacústica es mayor. De la investigación se concluyó que la técnica PLI focalizada aplicada a los coloides con NpsAg presenta nuevas morfologías. En el caso del oro se encontró un cambio de tamaño.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the present thesis, the change in morphology and size of gold nanoparticles obtained by laser ablation was investigated using different reconfiguration methods. In the case of gold, the target was ablated with a pulsed Nd: YAG laser, (1064 nm, 37.48 mJ/p, 10 Hz, during 10 minutes), the absorption spectra present a single absorption maximum at 521 nm characteristic of spherical gold nanoparticles. The PLI technique was applied to the colloids with laser pulses of 532 nm wavelength, 25.8 mJ of energy during 6 minutes. The analysis by dynamic dispersion of light (DLS) showed that the NpsAu with PLI were 21 nm in diameter. In addition, it was found that the amplitude of the photoacoustic signal is directly and proportionally related to the concentration of NpsAu on the colloid, showing that the higher the concentration, the greater the photoacoustic response. From the research it was concluded that the focused PLI technique applied to colloids with NpsAg presents new morphologies. In the case of gold, a change in size was found.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fotoacústica]]></kwd>
<kwd lng="es"><![CDATA[nanopartículas de oro]]></kwd>
<kwd lng="es"><![CDATA[ablación con láser]]></kwd>
<kwd lng="en"><![CDATA[Photoacoustics]]></kwd>
<kwd lng="en"><![CDATA[gold nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[laser ablation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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