<?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>0121-7488</journal-id>
<journal-title><![CDATA[Ciencia en Desarrollo]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencia en Desarrollo]]></abbrev-journal-title>
<issn>0121-7488</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-74882017000100099</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Synthesis of Hematite a-Fe 2 O 3 Nano Powders by the controlled precipitation method]]></article-title>
<article-title xml:lang="es"><![CDATA[Síntesis de nano polvos de hematita a-Fe 2 O 3 por el método de precipitación controlada]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Morales]]></surname>
<given-names><![CDATA[Jimmy Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Santiago de Cali University Faculty Basic Sciences ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<fpage>99</fpage>
<lpage>107</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-74882017000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-74882017000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-74882017000100099&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Recently increased attention has been paid to the synthesis of hematite nanoparticles, due to its properties and application in various fields of modern technology. The aqueous route has shown to be simpler and more versatile than the non-aqueous routes. In this study, nanopowder particles of OC-Fe2O3 (hematite) were synthesized by controlled precipitation method in three stages: precursors' precipitation, washing and calcination. The precipitation was controlled with ferric chloride as precursor, and sodium hydroxide as precipitant, in constant agitation and pH 6. There were tested with different reaction times: With 1 and 2 days. With one day reaction, the synthesis of hematite accompanied by maghemite, was verified by XRD. After 2 days of the reaction was proved that it is possible to obtain hematite and maghemite in greater quantities, but with magnetite impurities, and less chloride content, thanks to repeated washings. This is an interesting observation since impurities magnetite has not been reported in the synthesis of hematite by controlled precipitation method. It was found that the reaction time and repeated washings used in the synthesis process, played an important role in determining the iron oxides and particle size, plus phase formation and transformation, which was confirmed at different reaction times and repeated washings by XRD analysis, FT-IR, Raman and SEM. Samples with two days reaction, washed and calcinated at 425 °C, with a size less than 100 nm are associated with a hematite, magnetite and maghemite mixture, with almost a plate-shaped sphere morphology and the aggregates are formed by hemispherical primary particles, whose size apparently is in the nanometers' order.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Recientemente se ha prestado mayor atención a la síntesis de nanopartículas de hematita, debido a sus propiedades y aplicaciones en diversos campos de la tecnología moderna. La ruta acuosa ha mostrado ser más simple y más versátil que las rutas no acuosas. En este estudio se sintetizaron nanopolvos de &#945;-Fe2O3 (hematita) por el método de precipitación controlada en tres etapas: precipitación de precursores, lavado y calcinación. La precipitación se controla con cloruro férrico como precursor, e hidróxido de sodio como agente de precipitación, en agitación constante y pH 6. Se probaron con tiempos de reacción de 1 y 2 días. Con un día de reacción, se comprobó por DRX la síntesis de hematita, acompañada de maghemita; esta es una observación interesante, ya que las impurezas de magnetita no se han informado en la síntesis de hematita por el método de precipitación controlada; además, no se eliminaron los cloruros en un lavado. Después de 2 días de reacción se concluyó que es posible obtener hematita y maghemita, pero con impurezas de magnetita y menos contenido de cloruros, gracias a lavados repetidos. Se encontró que el tiempo de reacción y los lavados repetidos utilizados en el proceso de síntesis jugaron un papel importante en la determinación de la transformación de los óxidos de hierro y del tamaño de la partícula y de la fase. La Formación/transformación de fases a diferente tiempo de reacción y lavados repetidos se confirmó por análisis XRD, FT-IR, SEM y Raman. Las muestras con dos días de reacción, lavadas y calcinadas a 425 °C, con tamaño &lt; 100 nm, se asocian a una mezcla de hematita, magnetita y maghemita, con morfología casi de placas en forma de esfera, y los agregados están formados por partículas primarias semiesféricas cuyo tamaño, al parecer, es del orden de nanómetros.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Magnetite]]></kwd>
<kwd lng="en"><![CDATA[Maghemite]]></kwd>
<kwd lng="en"><![CDATA[Hematite Nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[-Fe2O3 Nanopowder]]></kwd>
<kwd lng="en"><![CDATA[Raman]]></kwd>
<kwd lng="es"><![CDATA[Magnetita]]></kwd>
<kwd lng="es"><![CDATA[Maghemita]]></kwd>
<kwd lng="es"><![CDATA[Nanopartículas de hematita]]></kwd>
<kwd lng="es"><![CDATA[Nanopolvos de -Fe2O3]]></kwd>
<kwd lng="es"><![CDATA[Raman]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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