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    <title language="eng">The human factor - Results of a small-angle scattering data analysis round robin</title>
    <abstract language="eng">A round-robin study has been carried out to estimate the impact of the human element in small-angle scattering data analysis. Four corrected datasets were provided to participants ready for analysis. All datasets were measured on samples containing spherical scatterers, with two datasets in dilute dispersions and two from powders. Most of the 46 participants correctly identified the number of populations in the dilute dispersions, with half of the population mean entries within 1.5% and half of the population width entries within 40%. Due to the added complexity of the structure factor, far fewer people submitted answers on the powder datasets. For those that did, half of the entries for the means and widths were within 44 and 86%, respectively. This round-robin experiment highlights several causes for the discrepancies, for which solutions are proposed.</abstract>
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    <author>Brian Richard Pauw</author>
    <author>Glen Jacob Smales</author>
    <author>A. S. Anker</author>
    <author>V. Annadurai</author>
    <author>D. M. Balazs</author>
    <author>Ralf Bienert</author>
    <author>W. G. Bouwman</author>
    <author>Ingo Breßler</author>
    <author>J. Breternitz</author>
    <author>E. S. Brok</author>
    <author>G. Bryant</author>
    <author>A. J. Clulow</author>
    <author>E. R. Crater</author>
    <author>F. De Geuser</author>
    <author>A. Del Giudice</author>
    <author>J. Deumer</author>
    <author>S. Disch</author>
    <author>S. Dutt</author>
    <author>K. Frank</author>
    <author>E. Fratini</author>
    <author>P. R. A. F. Garcia</author>
    <author>E. P. Gilbert</author>
    <author>Marc Benjamin Hahn</author>
    <author>J. Hallett</author>
    <author>M. Hohenschutz</author>
    <author>M. Hollamby</author>
    <author>S. Huband</author>
    <author>J. Ilavsky</author>
    <author>J. K. Jochum</author>
    <author>M. Juelsholt</author>
    <author>B. W. Mansel</author>
    <author>P. Penttilä</author>
    <author>R. K. Pittkowski</author>
    <author>G. Portale</author>
    <author>L. D. Pozzo</author>
    <author>L. Rochels</author>
    <author>Julian Rosalie</author>
    <author>Patrick E. J. Saloga</author>
    <author>S. Seibt</author>
    <author>A. J. Smith</author>
    <author>G. N. Smith</author>
    <author>G. A. Spiering</author>
    <author>Tomasz M. Stawski</author>
    <author>O. Taché</author>
    <author>Andreas Thünemann</author>
    <author>K. Toth</author>
    <author>A. E. Whitten</author>
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      <type>uncontrolled</type>
      <value>Round Robin</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Data analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Small-angle scattering</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanomaterials</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Interlaboratory comparability</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nanostructure quantification</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Methodology</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>MOUSE</value>
    </subject>
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    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
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    <collection role="themenfelder" number="">Advanced Materials</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
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    <publisherName>Royal Society of Chemistry</publisherName>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Tuning ceria catalysts in aqueous media at the nanoscale: how do surface charge and surface defects determine peroxidase- and haloperoxidase-like reactivity</title>
    <abstract language="eng">Designing the shape and size of catalyst particles, and their interfacial charge, at the nanometer scale can radically change their performance. We demonstrate this with ceria nanoparticles. In aqueous media, nanoceria is a functional mimic of haloperoxidases, a group of enzymes that oxidize organic substrates, or of peroxidases that can degrade reactive oxygen species (ROS) such as H2O2 by oxidizing an organic substrate. We show that the chemical activity of CeO2−x nanoparticles in haloperoxidase- and peroxidaselike reactions scales with their active surface area, their surface charge, given by the ζ-potential, and their surface defects (via the Ce3+/Ce4+ ratio). Haloperoxidase-like reactions are controlled through the ζ-potential as they involve the adsorption of charged halide anions to the CeO2 surface, whereas peroxidase-like reactions without charged substrates are controlled through the specific surface area SBET. Mesoporous CeO2−x particles, with large surface areas, were prepared via template-free hydrothermal reactions and characterized by small-angle X-ray scattering. Surface area, ζ-potential and the Ce3+/Ce4+ ratio are controlled in a simple and predictable manner by the synthesis time of the hydrothermal reaction as demonstrated by X-ray photoelectron spectroscopy, sorption and ζ-potential measurements. The surface area increased with synthesis time, whilst the Ce3+/Ce4+ ratio scales inversely with decreasing ζ-potential. In this way the catalytic activity of mesoporous CeO2−x particles could be tailored selectively for haloperoxidase- and peroxidase-like reactions. The ease of tuning the surface properties of mesoporous CeO2x particles by varying the synthesis time makes the synthesis a powerful general tool for the preparation of nanocatalysts according to individual needs.</abstract>
    <parentTitle language="eng">Nanoscale</parentTitle>
    <identifier type="doi">10.1039/D2NR03172H</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">19.09.2022</enrichment>
    <author>E. Pütz</author>
    <author>Glen Jacob Smales</author>
    <author>O. Jegel</author>
    <author>Franziska Emmerling</author>
    <author>W. Tremel</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SAXS</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ceria</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Zeta potential</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">6 Materialchemie</collection>
    <collection role="institutes" number="">6.5 Synthese und Streuverfahren nanostrukturierter Materialien</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="themenfelder" number="">Advanced Materials</collection>
  </doc>
</export-example>
