Browsing Department of Chemistry by Title

Now showing items 234-253 of 357

Oer catalysis at activated and codeposited nife-oxo/hydroxide thin films is due to postdeposition surface-fe and is not sustainable without fe in solution

Farhat, Rida; Dhainy, Jihan; Halaoui, Lara I. (American Chemical Society, 2020)

This work examines by electrochemical measurements a hypothesis that low-coordination Fe on the surface (surface-Fe) of NiFe-oxo/hydroxide promotes catalysis for the oxygen evolution reaction (OER) rather than Fe in the ...
One-Pot Synthesis of Benzo[4,5]imidazo[2,1-a]isoquinolines and Isoquinolino[3,4-b]quinoxalines via Tandem Cyclization Strategies

Bagdasarian, Alex L.; Nguyen, Huy H.; Palazzo, Teresa Ann; Fettinger, James C.; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2016)

Two operationally simple one-pot protocols have been developed for the synthesis of amino-functionalized benzo[4,5]imidazo[2,1-a]isoquinolines and isoquinolino[3,4-b]quinoxalines. Optimization data and substrate scope for ...
Outstanding Enhancement of Curcumin Fluorescence in PDDA and Silica Nanoparticles Coated DMPC Liposomes Based Nanocapsules: Application for Selective Estimation of ATP**

Othman, Alaa K.; El-Kurdi, Riham; Patra, Digambara (John Wiley and Sons Inc, 2021)

Here we illustrate the synthesis of, 2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) liposome based poly(dimethyldiallylammonium chloride) (PDDA) nanocapsule where PDDA and silica nanoparticles are coated on the surface ...
Oxidative potential and chemical speciation of size-resolved particulate matter (PM) at near-freeway and urban background sites in the greater Beirut area

Daher, Nancy; Saliba, Najat A.; Shihadeh, Alan Louis; Jaafar, Malek; Baalbaki, Rima; Shafer, Martin Merrill; Schauer, James Jay; Sioutas, Constantinos (Elsevier, 2014)

To assess particle oxidative potential in the greater Beirut area, size-resolved PM10-2.5, PM2.5-0.25 and PM0.25 samples were collected at near-freeway and urban background sites. Metals and trace elements, including Mn, ...
Oxidative potential of ambient particulate matter in Beirut during Saharan and Arabian dust events

Lovett, Christopher; Sowlat, Mohammad Hossein; Saliba, Najat A.; Shihadeh, Alan Louis; Sioutas, Constantinos (Elsevier Ltd, 2018)

In this study, we examine the oxidative potential of airborne particulate matter (PM) in Beirut, Lebanon, as influenced by dust events originating in the Sahara and Arabian deserts. Segregated fine (<2.5 μm) and coarse ...
Perception, attitude, practice and barriers towards medical research among undergraduate students

El Achi, Dina; Al-Hakim, Lara; Makki, Maha H.; Mokaddem, Mona; Khalil, Pamela Abi; Kaafarani, Bilal R.; Tamim, Hani Mohammed (BioMed Central Ltd, 2020)

Background: Early exposure to medical research, specifically at the undergraduate level, contributes in building a solid medical education for students. In 2014, the Medical Research Volunteer Program (MRVP) was established ...
Perspective on carbazole-based organic compounds as emitters and hosts in TADF applications

Wex, Brigitte; Kaafarani, Bilal R. (Royal Society of Chemistry, 2017)

The field of organic light-emitting devices (OLEDs) has undergone a remarkable journey since its discovery by Tang and VanSlyke with an alternation of utilizing fluorescence and phosphorescence as the emitting vehicle. The ...
Photocatalytic activity of ZnFe2O4/NiO nanocomposites carried out under UV irradiation

Aridi, Amani; Naoufal, Daoud M.; El-Rassy, Houssam; Awad, Ramadan (Elsevier Ltd, 2022)

The photocatalytic activity of zinc ferrite (ZnFe2O4) nanoparticles (NPs) is suppressed by the rapid recombination of the photogenerated electron-hole pair. Herein to achieve electron-hole separation, ZnFe2O4 was combined ...
Photocatalytic and Kinetic Study on the Degradation of Three Food Pesticides Using Vanadium-Substituted Polyoxotungstates

Youssef, Lobna; El-Rassy, Houssam; Younes, Ghassan O.; Al-Oweini, Rami (Springer International Publishing, 2019)

Mono-, di-, and tri-vanadium-substituted Keggin-type heteropolyoxoanions [SiW12O40]4− and [PW12O40]4− were evaluated as photocatalysts for the photodegradation of three hazardous food pesticides: atrazine, chlorpyrifos, ...
Photocatalytic Properties of All Four Polymorphs of Nanostructured Iron Oxyhydroxides

Ali, Feysal M.; Hmadeh, Mohamad; O'Brien, Paul G.; Perović, Douglas D.; Ozin, Geoffrey A. (John Wiley and Sons Inc, 2016)

Four different polymorphs of nanostructured iron oxyhydroxides, namely; goethite (α-FeOOH), akaganeite (β-FeOOH), lepidocrocite (γ-FeOOH), and feroxyhyte (δ-FeOOH) were synthesized and fully characterized by X-ray diffraction, ...
Photochemical Preparation of 1,2-Dihydro-3 H-indazol-3-ones in Aqueous Solvent at Room Temperature

Zhu, Jie S.; Kraemer, Niklas; Li, Clarabella J.; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2018)

o-Nitrosobenzaldehyde is a reactive intermediate useful in the synthesis of nitrogen heterocycles. Previous strategies for using o-nitrosobenzaldehyde involve its isolation via chromatography and/or formation under harsh ...
Photodegradation of methylene blue catalyzed by tungstophosphate/aerogel hybrid materials under ultraviolet irradiation

Yahya, Fatima; El-Rassy, Houssam; Younes, Ghassan O.; Al-Oweini, Rami (Desalination Publications, 2020)

In this study, the tungstophosphates structural-family series (PW9, P2 W12, P2 W15, P2 W18, P4 W24, P5 W30, P6 W18, and P8 W48) were successfully immobilized onto silica aerogels (tetraethyl orthosilicate aerogel, TEOS) ...
Photoelectrochemical Investigation of the Mechanism of Enhancement of Water Oxidation at the Hematite Nanorod Array Modified with niBi

Halaoui, Lara I. (American Chemical Society, 2016)

Modifying the surface of a hematite photoanode with NiBi or CoPi oxygen evolution catalysts has been reported to reduce the bias required for photooxidation of water, but the mechanism remains a subject of discussion. In ...
Photophysical properties of neutral and dissociated forms of rosmarinic acid

Danaf, Nader Al; Melhem, Racha Abi; Assaf, Khaleel I.; Nau, Werner M.; Patra, Digambara (Elsevier, 2016)

Polyphenols are bioactive components that have attracted attention by chemists over many years. Rosmarinic acid (RA) is a polyphenol that is widely investigated for its broad range of potential applications as an ...
Physicochemical, melissopalynological and antioxidant properties of artisanal honeys from Lebanon

Jaafar, K.; Haidar, J.; Kuraydiyyah, S.; Ghaddar, T.; Knio, K.; Ismail, B.; Toufeili, I. (Springer India, 2017)

Sixteen honeydew and 15 floral honeys from Lebanon were analyzed for pollen spectra and physicochemical parameters. A total of 37 families and 67 taxa were recorded with the honeybees producing honeydew honey exhibiting a ...
Physicochemical, melissopalynological and antioxidant properties of artisanal honeys from Lebanon

Jaafar, Katherine; Haidar, Janay; Kreydiyyeh, Sawsan Ibrahim; Ghaddar, Tarek H.; Knio, Khouzama M.; Ismail, Baraem P.; Toufeili, I. (Springer India, 2017)

Sixteen honeydew and 15 floral honeys from Lebanon were analyzed for pollen spectra and physicochemical parameters. A total of 37 families and 67 taxa were recorded with the honeybees producing honeydew honey exhibiting a ...
PNP-Pincer Complexes of Osmium: Comparison with Isoelectronic (PCP)Ir and (PNP)Ir+ Units

Lease, Nicholas; Pelczar, Elizabeth M.; Zhou, Tian; Malakar, Santanu; Emge, Thomas J.; Hasanayn, Faraj; Krogh-Jespersen, Karsten J.; Goldman, Alan S. (American Chemical Society, 2018)

Several complexes of (tBu4PNP)Os (1) (tBu4PNP = C5NH3-2,6-(CH2PtBu2)2) are reported. 1 is isoelectronic with (tBu4PCP)Ir (2), which has played a leading role in homogeneous catalytic alkane dehydrogenation; the (tBu4PNP)Os ...
Poly (9-(2-diallylaminoethyl)adenine HCl-co-sulfur dioxide) deposited on silica nanoparticles constructs hierarchically ordered nanocapsules: Curcumin conjugated nanocapsules as a novel strategy to amplify guanine selectivity among nucleobases

Mouslmani, Mai; Bouhadir, Kamal Hani; Patra, Digambara (Elsevier Ltd, 2015)

Poly (9-(2-diallylaminoethyl)adenine HCl-co-sulfur dioxide) (Poly A) deposited on silica nanoparticles self-assembles to form hierarchically ordered nanocapsules. These nanocapsules can be conjugated with curcumin. The ...
Polyelectrolyte mediated nano hybrid particle as a nano-sensor with outstandingly amplified specificity and sensitivity for enzyme free estimation of cholesterol

Chebl, Mazhar; Moussa, Zeinab; Peurla, Markus; Patra, Digambara (Elsevier B.V., 2017)

As a proof of concept, here it is established that curcumin integrated chitosan oligosaccharide lactate (COL) self-assembles on silica nanoparticle surface to form nano hybrid particles (NHPs). These NHPs have size in the ...
Polygonal boundary gaps in multiple diffusion source precipitation systems in gel media

Ezzeddine, Dalia; Sultan, Rabih F. (American Institute of Physics Inc., 2022)

We investigate multiple reaction-diffusion processes that engender the formation of distinct precipitation zones. In this paper, we carry out various original precipitation reactions in a gel medium, wherein the interdiffusion ...

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Browsing Department of Chemistry by Title

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