<?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>S0379-39822022000100054</article-id>
<article-id pub-id-type="doi">10.18845/tm.v35i3.5611</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diseño y desarrollo de una plataforma microfluídica con electrodos interdigitados para espectroscopía por impedancia eléctrica]]></article-title>
<article-title xml:lang="en"><![CDATA[Design and development of a microfluidic platform with interdigitated electrodes for electrical impedance spectroscopy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barboza-Retana]]></surname>
<given-names><![CDATA[José Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega-Sánchez]]></surname>
<given-names><![CDATA[Cristopher]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Juan J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiel-Hidalgo]]></surname>
<given-names><![CDATA[Steven]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madrigal-Gamboa]]></surname>
<given-names><![CDATA[Sofia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega-Castillo]]></surname>
<given-names><![CDATA[Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rímolo-Donadío]]></surname>
<given-names><![CDATA[Renato]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>54</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822022000100054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822022000100054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822022000100054&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este artículo se describe el proceso de diseño, fabricación y caracterización de un arreglo de sensores para realizar EIS de amplio espectro para muestras en solución acuosa en una plataforma microfluídica. Su capacidad de amplio aspecto permitirá desarrollar estudios de caracterización de fluidos con resultados que no son posibles de obtener en sistemas de menor rango de frecuencia. El sistema microfluídico consta de cuatro cámaras de llenado y los canales de transporte de fluidos requeridos para la purga y llenado. En la sección inferior de cada cámara hay un electrodo depositado en oro que permite la interacción eléctrica con la muestra. La geometría de las cámaras y los canales transporte y de los electrodos fueron diseñadas utilizando un proceso de optimización por medio de simulaciones multifísicas. Luego, se desarrollaron experimentalmente diferentes procesos de fabricación para SU8 y PDMS los cuales permitieron llevar a cabo la implementación del sistema microfluídico. Finalmente, utilizando una interfaz de comunicación eléctrica diseñada para la interconexión del sistema microfluídico con un analizador vectorial de redes, se desarrollaron las mediciones requeridas para obtener el comportamiento de cada sensor. Los resultados obtenidos mostraron un comportamiento predominantemente capacitivo de cada sensor desde bajas frecuencias hasta 2 GHz, permitiendo obtener suficiente contraste entre las diferentes soluciones acuosas medidas, logrando una buena repetitividad entre las mediciones realizadas en las distintas cámaras.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this paper, we describe the design, manufacturing, and characterization of a sensor array suitable for implementing wide broad band EIS for samples in aqueous solution on a microfluidic platform. Its wide-ranging capacity will allow the development of fluid characterization studies with results that are not possible to obtain in systems with a lower frequency range. The microfluidic system consists of four filling chambers and the fluid transport channels required for flushing and filling. At the bottom section of each chamber there is a gold-deposited electrode that allows electrical interaction with the sample. The chamber's geometry, transport channels, and the electrodes were designed using an optimization process through multiphysics simulations. Then, different manufacturing processes were developed experimentally for SU8 and PDMS which allowed to carry out the implementation of the microfluidic system. An electrical communication interface was designed for the interconnection of the microfluidic system with the vector network analyzer (VNA). Then, the measurements required to obtain the behavior of each sensor were developed. The results obtained show a predominant capacitive behavior of each sensor from low frequencies up to 2 GHz, allowing to obtain sufficient contrast between different aqueous solutions and a good repeatability in different sensing chambers with the same solutions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Análisis espectral]]></kwd>
<kwd lng="es"><![CDATA[Analizador Vectorial de Redes (AVR)]]></kwd>
<kwd lng="es"><![CDATA[Espectroscopia por Impedancia Eléctrica (EIS)]]></kwd>
<kwd lng="es"><![CDATA[microfluídica]]></kwd>
<kwd lng="es"><![CDATA[microsistemas]]></kwd>
<kwd lng="es"><![CDATA[sensores]]></kwd>
<kwd lng="en"><![CDATA[Electrical Impedance Spectroscopy (EIS)]]></kwd>
<kwd lng="en"><![CDATA[microfluidics]]></kwd>
<kwd lng="en"><![CDATA[microsystems]]></kwd>
<kwd lng="en"><![CDATA[sensors]]></kwd>
<kwd lng="en"><![CDATA[spectral analysis]]></kwd>
<kwd lng="en"><![CDATA[Vector Network Analyzer (VNA)]]></kwd>
</kwd-group>
</article-meta>
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