36 research outputs found
Synergistic Effect of Ligand-Cluster Structure and Support in Gold Nanocluster Catalysts for Selective Hydrogenation of Alkynes
No full text<h2>Data for the research article titled: "Synergistic Effect of Ligand-Cluster Structure and Support in Gold Nanocluster Catalysts for Selective Hydrogenation of Alkynes"</h2>
<p>Data used in the <a href="https://doi.org/10.1039/D4NR03865G">research article</a> and its supporting information. The paper was published in the Nanoscale journal by RSC.</p>
<h3>Authors</h3>
<p>Rares, Banu, Adea Loxha, Nicole Müller, Stylianos Spyroglou, Egon Erwin Rosenberg, A.<br>Eduardo Palomares, Fernando Rey, Carlo Marini, Noelia Barrabés∗</p>
<h3>Funding</h3>
<p>FWF via grant Elise Richter (V831-N); by the Spanish National Research Council for the project i-LINK 2023(ILINK23067) and the COST Action CA21101 COSY. We thank ALBA synchrotron for the beamtime. </p>
<h3>Context and methodology</h3>
<ul>
<li>In this article we report on the use of supported gold nanoclusters in the selective hydrogenation of alkynes to alkenes and investigate the support and pretreatment effect.</li>
<li>The dataset serves as a public resource and contains the data used in the manuscript and its supporting information.</li>
<li>The data was acquired by using different analytical methods, including various spectroscopies, and chromatographies.</li>
</ul>
<h3>Technical details</h3>
<ul>
<li>The files uploaded contain the measured XAFS, gas-chromatography, XRD, UV-Vis and MALDI-MS.</li>
<li>The OPJU files are graphs and can be opened with the <a href="https://en.wikipedia.org/wiki/Origin_(data_analysis_software)">Origin</a> software</li>
</ul>
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
Full text linkThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Development of a mesoporous silica-based mid-infrared biosensor for the quantification FAME in jet fuel
Full text linkJet-Kraftstoff in Europa wird oft durch dieselben Pipelines und Tanker wie Biodiesel transportiert. Dies führt zu einer Kontamination des Kerosins mit Fettsäuremethylestern (FSME), was die Qualität des Kraftstoffs mindert. Daher ist es wichtig, FSME im Kerosin vor der Verwendung zu überwachen und zu quantifizieren. Die Messung wird normalerweise off-line in Testlabors durchgeführt. Ziel dieser Arbeit ist die Entwicklung eines Biosensors zur Quantifizierung von FSME, der at-line verwendet werden kann, um die Prüfung effizienter zu gestalten. Das Enzym Lipase soll für die selektive Reaktion von FSME in einer komplexen Matrix eingesetzt werden. Im mittleren Infrarotbereich können Biosensoren erfolgreich realisiert werden, indem die bioaktive Substanz (Lipase) im evaneszenten Feld von abgeschwächten Totalreflexions- (ATR) Kristallen immobilisiert wird, wodurch eine Echtzeitüberwachung der katalysierten Reaktion ermöglicht wird. Die Effektivität dieses Ansatzes kann durch den Einsatz von mesoporösen Schichten verbessert werden, um die Oberfläche und damit die Anzahl der bioaktiven Enzyme im spektroskopisch untersuchten Volumen erheblich zu erhöhen.Diese Arbeit zielte darauf ab, die Substratquantifizierung enzymatischer Reaktionen zu verbessern, wobei insbesondere die Hydrolyse und Aminolyse mittels FTIR-Spektroskopie untersucht wurden. Besonderes Interesse galt der Optimierung der Aminolyse-Reaktion von FSME, die durch eine Lipase katalysiert wurde, als Grundlage für den Biosensor. Eine umfassende Untersuchung geeigneter Lipase-Substrat-Paare wurde durchgeführt, um die effizientesten Paarungen zu bestimmen. Weiterhin wurden mesoporöse Siliciumdioxid-Filme, die auf eine Porengröße von ca. 8 nm und eine Schichtdicke von 500 nm optimiert wurden, auf Si-ATR-Kristalle aufgebracht. Lipase-Enzyme wurden dann auf diesen Siliciumdioxid-Filmen immobilisiert, wobei deren einzigartige Struktur genutzt wurde, um die Enzymadsorption zu erleichtern und weiterhin als Anreicherungsschicht für den Analyten zu dienen. Dieser Ansatz zeigt die Anwendbarkeit von mesoporösen Siliciumdioxid-Film-beschichteten ATR-Kristallen zur Überwindung von Herausforderungen, die mit traditionellen Biosensoren in der IR-Spektroskopie verbunden sind.Mit einem funktionierenden enzymatischen System, einer angemessenen mesoporösen Schicht und erfolgreicher Immobilisierung zeigen diese Erkenntnisse vielversprechende Fortschritte für die Biosensortechnologie, indem mesoporöse Siliciumdioxid-Filme und ATR-FTIR-Spektroskopie kombiniert werden, nicht nur zur Quantifizierung und in-situ Reaktionsüberwachung mittels IR, sondern auch zur Verbesserung der enzymatischen Sensortechnologie.Jet fuel in Europe is often transported though the same pipelines and tankers as biodiesel. This leads to the contamination of the kerosene with fatty acid methyl esters (FAME), which diminishes the quality of the fuel. Therefore, it is important to monitor and quantify the FAME in kerosene before usage. The measurement is usually performed off-line in test labs. The goal of this thesis is the development of a biosensor for the quantification of FAME which can be used at-line, making the testing more time efficient. The enzyme lipase should be used for selective reaction of FAME in a complex matrix. In the mid-infrared, biosensors can be successfully realized by immobilizing the bioactive substance (ipase) in the evanescent field of attenuated total reflection (ATR) crystals allowing for the real-time monitoring of the catalyzed reaction. The effectiveness of this approach can be enhanced by employing mesoporous layers to significantly increase the surface area and, thus, the number of bioactive enzymes in the spectroscopically probed volume.This study aimed to enhance the substrate quantification of enzymatic reactions, specifically investigating hydrolysis and aminolysis using FTIR spectroscopy. Of special interest was the optimization of the aminolysis reaction of FAME facilitated by a lipase as the foundation for the biosensor. A comprehensive study of suitable lipase-substrate pairs was performed to determine the most efficient pairings. Further, mesoporous silica films, which were optimized to attain pore sizes of approx. 8 nm and a layer thickness of 500 nm, were applied onto Si ATR crystals. Lipase enzymes were then immobilized onto these silica films, leveraging their unique structure to facilitate enzyme attachment and further serve as an enrichment layer for the analyte. This approach demonstrates the applicability of mesoporous silica film-coated ATR crystals in overcoming challenges associated with traditional biosensors in IR spectroscopy.With a functioning enzymatic system, an adequate mesoporous layer and successful immobilization, these findings hold promise for advancing biosensing capabilities by combining mesoporous silica films and ATR-FTIR spectroscopy, not only for quantification and in-situ reaction monitoring via IR but also enhancing enzymatic sensor technology
Bimetallic active sites designed with atomic precision using metal nanoclusters: structural evolution and reactivity by operando spectroscopy
No full textSynergistic effect of ligand-cluster structure and support in gold nanocluster catalysts for selective hydrogenation of alkynes
No full text[EN] In the field of nanocluster catalysis, it is crucial to understand the interplay of different parameters, such as ligands, support and pretreatment and their effect on the catalytic process. In this study, we chose the selective hydrogenation of phenylacetylene as a model reaction and employed two gold nanoclusters as catalysts, the phosphine protected Au11 and the thiolate protected Au25, each with different binding motifs. They were supported on MgO, Al2O3 and a hydrotalcite (HT), chosen for their different acidity. We found that while in the case of the Au11 MgO was the preferred support and the pretreatment had a positive impact on the catalysis. For the Au25 the HT performed best and pretreating had negative effects, indicating that the bonding motif of the ligands and their interaction with the support is crucial for the catalytic process. Using X-ray absorption spectroscopy we could trace these phenomena to changes in the cluster-ligand interface, which seem to impact the stability of the catalysts.The authors thank the support by the Austrian Science Fund (FWF) via grant Elise Richter (V831-N); by the Spanish National Research Council for the project i-LINK 2023(ILINK23067) and the COST Action CA21101 COSY. We thank ALBA synchrotron for the beamtime. These experiments were performed at CLAESS beamline (experiment 2022097069) with the collaboration of ALBA staff. The authors want to acknowledge the support from Prof. Maricruz Sanchez-Sanchez.Banu, R.;Loxha, A.;Müller, N.;Spyroglou, S.;Rosenberg, EE.;Palomares Gimeno, AE.;Rey Garcia, F.... (2025). Synergistic effect of ligand-cluster structure and support in gold nanocluster catalysts for selective hydrogenation of alkynes. Nanoscale. 17(9):5098-5105. https://doi.org/10.1039/d4nr03865gS5098510517
Dentalgram - Vol. 22, No. 05
Full text linkIn this issue: Charles J. Goodacre received 2008 Gies Award from ADEA Faculty author major textbooks Remembering Connie Carlson Dean\u27s list - winter quarter, 2008 Jennifer Romage named assistant supervisor School tells employees \u27thank you\u27 Dentalgram readership survey Remodeling continues in Prince Hall Laboratorieshttps://scholarsrepository.llu.edu/dentalgram/1197/thumbnail.jp
The case for additive bilingual/multilingual models
No full textWhat learning models promise the best scholastic results and a better return on investment? The author offers an overview of language approaches being used in Africa along with research results highlighted in a 1953 UNIESCO study as well as more recent studies like that of ADEA, the UIE and the GTZ.
The case for additive bilingual/multilingual models
No full textWhat learning models promise the best scholastic results and a better return on investment? The author offers an overview of language approaches being used in Africa along with research results highlighted in a 1953 UNIESCO study as well as more recent studies like that of ADEA, the UIE and the GTZ.
Directing chirality on gold nanoclusters and their activity in LEX and asymmetric catalysis
No full text
