<?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>2448-5691</journal-id>
<journal-title><![CDATA[Mundo nano. Revista interdisciplinaria en nanociencias y nanotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Mundo nano]]></abbrev-journal-title>
<issn>2448-5691</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-56912020000200009</article-id>
<article-id pub-id-type="doi">10.22201/ceiich.24485691e.2020.25.69617</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El rol de la función de transferencia de contraste en la formación de imágenes de resolución atómica de nanopartículas]]></article-title>
<article-title xml:lang="en"><![CDATA[The role of the contrast transfer function in the formation of atomic resolution images of nanoparticles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angeles Chávez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Petróleo  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>13</volume>
<numero>25</numero>
<fpage>9</fpage>
<lpage>27</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-56912020000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-56912020000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-56912020000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los resultados de microscopía electrónica de transmisión de alta resolución pueden ser cuantitativamente interpretados cuando se realizan los ajustes necesarios de la óptica-electrónica del instrumento para la adquisición de las imágenes de resolución atómica. En este trabajo se describen cualitativamente los principios de la formación de imagen en términos de la difracción de electrones y de la óptica electrónica. Al final, el proceso se resume a dos parámetros: la función de transferencia de contraste (FTC) y el desenfoque de la imagen del objeto. El resultado es el control preciso de la modulación de la amplitud y la fase de la FTC a través del desenfoque para conseguir contraste de fase más fuerte e intensos en los espaciados interplanares de la red cristalina de la partícula bajo estudio. Contrastes intensos brillantes u oscuros se pueden lograr a partir del foco de Scherzer hacia valores más negativos. De esta manera, se logró evidenciar clústeres de WOx de contrastes oscuros sobre líneas de red de contraste brillante de la m-ZrO2, modulando la fase y amplitud de la FTC a través de la manipulación controlada y precisa del foco.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: High resolution transmission electron microscopy results can be quantitatively interpreted if an optimum adjustment is performed in the optical-electronic of the instrument during the atomic resolution images acquisition. This work qualitatively describes the principles of imaging formation by using the theory of electron diffraction and electronic-optics. At the end, the process is summarized through two parameters: contrast transfer function (CTF) and defocus of the image. The result is the modulation of the amplitude and phase in the CTF in order to obtain stronger phase contrast on the d-spacing of the nanoparticle under observation. Brighter or darker contrasts can be achieved from Scherzer focus and at values of bigger negative defocus. In this way, dark contrasts of WOx clusters on crystalline lattice of bright contrast corresponding to the m-ZrO2 nanoparticle through a controlled and precise manipulation of the defocus was evidenced.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[microscopía electrónica de transmisión (MET)]]></kwd>
<kwd lng="es"><![CDATA[imágenes]]></kwd>
<kwd lng="es"><![CDATA[resolución atómica]]></kwd>
<kwd lng="es"><![CDATA[nanopartícula]]></kwd>
<kwd lng="es"><![CDATA[contraste de fase]]></kwd>
<kwd lng="en"><![CDATA[high resolution transmission electron microscopy (HRTEM)]]></kwd>
<kwd lng="en"><![CDATA[atomic resolution]]></kwd>
<kwd lng="en"><![CDATA[CFT]]></kwd>
<kwd lng="en"><![CDATA[nanoparticle]]></kwd>
<kwd lng="en"><![CDATA[phase contrast]]></kwd>
</kwd-group>
</article-meta>
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