Journal article Open Access

X-Ray Absorption Spectroscopy of TiO2 Nanoparticles in Water Using a Holey Membrane-Based Flow Cell

Petit, Tristan; Ren, Jian; Choudhury, Sneha; Golnak, Ronny; Lalithambika, Sreeju SN; Tesch, Marc F; Xiao, Jie; Aziz, Emad F


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    <dct:title>X-Ray Absorption Spectroscopy of TiO2 Nanoparticles in Water Using a Holey Membrane-Based Flow Cell</dct:title>
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        <foaf:name>European Commission</foaf:name>
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    <dct:description>&lt;p&gt;Many applications of TiO2 nanoparticles, such as photocatalytic water splitting&lt;br&gt; or water remediation, occur in aqueous environment. However, the&lt;br&gt; impact of solvation on TiO2 electronic structure remains unclear because&lt;br&gt; only few experimental methods are currently available to probe nanoparticle&amp;ndash;&lt;br&gt; water interface. Soft X-ray absorption spectroscopy has been extensively&lt;br&gt; used to characterize the electronic structure of TiO2 materials, but so far&lt;br&gt; only in vacuum conditions. Here, oxygen K edge and titanium L edge X-ray&lt;br&gt; absorption spectroscopy characterization of TiO2 nanoparticles measured&lt;br&gt; directly in aqueous dispersion is presented. For this purpose, a new method&lt;br&gt; to probe nanomaterials in liquid using a holey membrane-based flow cell is&lt;br&gt; introduced. With this approach, the X-ray transmission of the membrane is&lt;br&gt; increased, especially in the water window, compared to solid membranes.&lt;/p&gt;</dct:description>
    <dct:description xml:lang="">This project was mainly funded by the Volkswagen Foundation (Freigeist Fellowship No. 89592).</dct:description>
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