Search results for: Nour Nijem

Items from 1 to 17 out of 17 results

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Manganese oxide nanorod–graphene/vanadium oxide nanowire–graphene binder-free paper electrodes for metal oxide hybrid supercapacitors

Sanjaya D. Perera, Mark Rudolph, Ruperto G. Mariano, Nour Nijem, more

Nano Energy > 2013 > 2 > 5 > 966-975

In this study MnO ₂ nanorodes (MNR) were fabricated on reduced graphene oxide (rGO) sheets using a facile hydrothermal synthesis route. As prepared binder free MNR-rGO electrodes exhibited promising electrochemical performance. A similar approach was employed to prepare V ₂ O ₅ nanowire (VNW) on rGO electrodes as anodes for supercapacitor applications. The VNW-rGO anode and...

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Selective detection of olefins using a luminescent silver-functionalized metal organic framework, RPM3

Anne M. Marti, Nour Nijem, Yves J. Chabal, Kenneth J. Balkus

Microporous and Mesoporous Materials > 2013 > 174 > Complete > 100-107

A highly flexible, luminescent, three-dimensional metal organic framework (MOF), [Zn ₂ (bpdc) ₂ (bpee)]·2DMF (bpdc=4,4′-biphenyldicarboxylate; bpee=1,2-bipyridylethylene) also known as RPM3 was post functionalized with AgNO ₃ forming a π complex with the MOF’s conjugated linkers. The Ag ⁺ functionalized MOF in its activated form exhibits structural rearrangements from...

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Vanadium oxide nanowire – Graphene binder free nanocomposite paper electrodes for supercapacitors: A facile green approach

Sanjaya D. Perera, Anjalee D. Liyanage, Nour Nijem, John P. Ferraris, more

Journal of Power Sources > 2013 > 230 > Complete > 130-137

Vanadium oxide has attracted interest for energy storage applications due to its high theoretical capacitance and stable layered structure. The low electronic conductivity, of V ₂ O ₅ necessitates combining with conducting materials, typically carbon. However combining with conductive carbon materials may require binders, which compromise the active surface. In this study, V ₂...

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Innentitelbild: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. 6/2013)

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie > 125 > 6 > 1640 - 1640

Gasadsorptionsmechanismen müssen auf molekularer Ebene verstanden werden, um zu einer rationalen Entwicklung von Materialien zu gelangen, die schädliche Treibhausgase aus der Atmosphäre entfernen können. In ihrer Zuschrift auf S. 1736 ff. beschreiben J. Li und J. B. Parise et al. die Adsorption von CO₂‐Molekülen in einer Tasche aus zwei aromatischen Ringen eines nanoporösen Koordinationsgerüsts. Die...

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Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie > 125 > 6 > 1736 - 1739

Gefangen in einem porösen Material: Die Position von adsorbiertem CO₂ in einem nanoprösen Koordinationsgerüst wurde durch eine Kombination verschiedener Methoden, wie Einkristallröntgenbeugung, In‐Situ‐Pulverdiffraktometrie und theoretische Studien, bestimmt. Die Ergebnisse zeigen, dass das adsorbierte CO₂‐Molekül in einer Tasche zwischen zwei Phenylringen bleibt und mit der aromatischen Elektronendichte...

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Inside Cover: Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence (Angew. Chem. Int. Ed. 6/2013)

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie International Edition > 52 > 6 > 1598 - 1598

Understanding of gas adsorption mechanisms at the molecular level is vital for the rational development of compounds that can remove harmful greenhouse gases from the atmosphere. In their Communication on page 1692 ff., J. Li and J. B. Parise et al. describe the adsorption of CO₂ molecules in a “pocket” between two aromatic rings of a nanoporous coordination network. The CO₂–framework interaction...

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Mechanism of Carbon Dioxide Adsorption in a Highly Selective Coordination Network Supported by Direct Structural Evidence

Anna M. Plonka, Debasis Banerjee, William R. Woerner, Zhijuan Zhang, more

Angewandte Chemie International Edition > 52 > 6 > 1692 - 1695

Trapped in a porous material: The position of adsorbed CO₂ in a nanoporous coordination framework was determined using a combination of techniques including single‐crystal X‐ray diffraction, in situ X‐ray powder diffraction coupled with differential scanning calorimetry, and theoretical calculations. The study reveals that the adsorbed CO₂ stays in a “pocket” between two phenyl rings, interacting...

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Alkaline deoxygenated graphene oxide for supercapacitor applications: An effective green alternative for chemically reduced graphene

Sanjaya D. Perera, Ruperto G. Mariano, Nour Nijem, Yves Chabal, more

Journal of Power Sources > 2012 > 215 > Complete > 1-10

Graphene is a promising electrode material for energy storage applications. The most successful method for preparing graphene from graphite involves the oxidation of graphite to graphene oxide (GO) and reduction back to graphene. Even though different chemical and thermal methods have been developed to reduce GO to graphene, the use of less toxic materials to generate graphene still remains a challenge...

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Enhanced Binding Affinity, Remarkable Selectivity, and High Capacity of CO₂ by Dual Functionalization of a rht‐Type Metal–Organic Framework

Baiyan Li, Zhijuan Zhang, Yi Li, Kexin Yao, more

Angewandte Chemie > 124 > 6 > 1441 - 1444

Offen und freundlich: Das kleinste Mitglied der Metall‐organischen Gerüstverbindungen (MOFs) vom rht‐Typ (siehe Bild), das einen Hexacarboxylatliganden mit stickstoffhaltigem Iminotriazin‐Rückgrat trägt, zeigt unter allen isoretikulären rht‐MOFs die höchste Affinität für die Bindung von Gasen. Der Grund für die gute Adsorptionskapazität und bemerkenswerte CO₂‐Selektivität ist die hohe Dichte an offenen...

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Enhanced Binding Affinity, Remarkable Selectivity, and High Capacity of CO₂ by Dual Functionalization of a rht‐Type Metal–Organic Framework

Baiyan Li, Zhijuan Zhang, Yi Li, Kexin Yao, more

Angewandte Chemie International Edition > 51 > 6 > 1412 - 1415

Open and friendly: The smallest member of the rht‐type metal–organic frameworks (MOFs, see picture) constructed by a hexacarboxylate ligand with a nitrogen‐rich imino triazine backbone shows a significantly enhanced gas binding affinity relative to all other isoreticular rht‐type MOFs. The high adsorption capacity and remarkable selectivity of CO₂ are attributed to the high density of open metal and...

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The Effect of Methyl Functionalization on Microporous Metal‐Organic Frameworks' Capacity and Binding Energy for Carbon Dioxide Adsorption

Hui Liu, Yonggang Zhao, Zhijuan Zhang, Nour Nijem, more

Advanced Functional Materials > 21 > 24 > 4754 - 4762

The design, synthesis, and structural characterization of two new microporous metal‐organic framework (MMOF) structures is reported; Zn(BDC)(DMBPY)_0.5·(DMF)_0.5(H₂O)_0.5 (1; H₂ BDC = 1,4‐benzenedicarboxylic acid; DMBPY=2,2′‐dimethyl‐4,4′‐bipyridine) and Zn(NDC)(DMBPY)_0.5·(DMF)₂ (2; H₂NDC = 2,6‐naphthalenedicarboxylic acid, DMF=N,N,‐dimethylformamide), which are obtained by functionalizing a pillar ligand...

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Understanding the Preferential Adsorption of CO ₂ over N ₂ in a Flexible Metal–Organic Framework

Nour Nijem, Peter Thissen, Yanpeng Yao, Roberto C. Longo, more

Journal of the American Chemical Society > 2011 > 133 > 32 > 12849 - 12857

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Enhancing Gas Adsorption and Separation Capacity through Ligand Functionalization of Microporous Metal–Organic Framework Structures

Yonggang Zhao, Haohan Wu, Thomas J. Emge, Qihan Gong, more

Chemistry – A European Journal > 17 > 18 > 5101 - 5109

Hydroxyl‐ and amino‐ functionalized [Zn(BDC)(TED)_0.5]⋅2DMF⋅0.2H₂O leads to two new structures, [Zn(BDC‐OH)(TED)_0.5]⋅1.5DMF⋅0.3H₂O and [Zn(BDC‐NH₂)(TED)_0.5]⋅xDMF⋅yH₂O (BDC=terephthalic acid, TED=triethylenediamine, BDC‐OH=2‐hydroxylterephthalic acid, BDC‐NH₂=2‐aminoterephthalic acid). Single‐crystal X‐ray diffraction and powder X‐ray diffraction studies confirmed that the structures of both functionalized...