Browsing Department of Chemistry by Title

Now showing items 42-61 of 357

Band Propagation, Scaling Laws, and Phase Transition in a Precipitate System III: Effect of the Anions of Precursors

Ammar, Manal; Al-Ghoul, Mazen (American Chemical Society, 2020)

In this third part of this work, we study the effect of the nature of the anion (nitrate, chloride, bromide, and sulfate) of the nickel salt precursor on the emerging Liesegang pattern in the nickel hydroxide/ammonia system ...
Band Propagation, Scaling Laws, and Phase Transition in a Precipitate System. 2. Computational Study

Mansour, Andrew Abi; Al-Ghoul, Mazen (American Chemical Society, 2015)

In this second paper, we introduce a chemical kinetic model that investigates the dynamics of the experimental Ni2+/NH3-OH- Liesegang system characterized by a pattern of β-nickel hydroxide bands led by a growing pulse of ...
Bands, spherulites and 3D zonation in the carbonation of a slaked lime gel matrix

Ezzeddine, Dalia; Sultan, Rabih F. (Elsevier B.V., 2022)

We investigate the formation of CaCO3 zonation using a displacement reaction in the solid phase through the diffusion of aqueous carbonic acid into a slaked lime [Ca(OH)2] gel putty. The obtained calcium carbonate gives ...
Binding of metal ions to the curcumin mediated methoxy polyethylene glycol thiol conjugated greenly synthesized gold nanoparticles: A fluorescence spectroscopic study

Al-Shehab, Shehab; Patra, Digambara (Elsevier B.V., 2021)

Curcumin, a nontoxic molecule obtained from plant extract, was used to reduce gold salt to produce gold nanoparticles (AuNPs). First time the particles were functionalized with methoxy polyethylene glycol thiol (mPEGT), ...
Bioactivity of indigenous medicinal plants against the cotton whitefly, Bemisia tabaci

Abou-Fakhr Hammad, Efat; Zeaiter, A.; Saliba, Najat A.; Talhouk, S. N. (Library of the University of Arizona, 2014)

Forty-one methanol extracts of 28 indigenous medicinal plant species were tested for their insecticidal bioactivity against cotton whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), adults and second nymphal ...
Bioactivity of indigenous medicinal plants against the cotton whitefly, Bemisia tabaci

Abou-Fakhr Hammad, Efat; Zeaiter, A.; Saliba, Najat A.; Talhouk, S. N. (Library of the University of Arizona, 2014)

Forty-one methanol extracts of 28 indigenous medicinal plant species were tested for their insecticidal bioactivity against cotton whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), adults and second nymphal ...
Biomarkers of exposure to new and emerging tobacco delivery products

Schick, Suzaynn Francine; Blount, Benjamin C.; Jacob, Peyton J.; Saliba, Najat A.; Bernert, John Thomas; El-Hellani, Ahmad; Jatlow, Peter I.; Pappas, R. Steven; Wang, Lanqing; Foulds, Jonathan A.; Ghosh, Arunava; Hecht, Stephen S.; Gomez, John C.; Martin, Jessica R.; Mesaros, Clementina A.; Srivastava, Sanjay Kumar; Helen, Gideon St; Tarran, Robert; Lorkiewicz, Pawel K.; Blair, Ian A.; Kimmel, Heather L.; Doerschuk, Claire M.; Benowitz, Neal L.; Bhatnagar, Aruni (American Physiological Society, 2017)

Accurate and reliable measurements of exposure to tobacco products are essential for identifying and confirming patterns of tobacco product use and for assessing their potential biological effects in both human populations ...
Bis(tercarbazole) pyrene and tetrahydropyrene derivatives: Photophysical and electrochemical properties, theoretical modeling, and OLEDs

Kaafarani, Bilal R.; El-Assaad, Tarek H.; Smith, William A.; Ryno, Sean M.; Hermerschmidt, Felix; Lyons, Jeffrey; Patra, Digambara; Wex, Brigitte; List-Kratochvil, Emil J.W.; Risko, Chad M.; Barlow, Stephen; Marder, Seth R. (Royal Society of Chemistry, 2019)

2,7-Bis(3,3′′,6,6′′-tetra(tert-butyl)-9′H-9,3′:6′,9′′-tercarbazol-9-yl)-4,5,9,10-tetrahydropyrene (3) and 2,7-bis(3,3′′,6,6′′-tetra(tert-butyl)-9′H-9,3′:6′,9′′-tercarbazol-9-yl)pyrene (4), along with a model compound, ...
Breaking the cycle: Existential politics and the Beirut explosion

Geha, Carmen; Kanaan, Fida; Aoun Saliba, Najat (Brill Academic Publishers, 2020)

This essay was written in the wake of the Beirut port explosion on August 4th, 2020. We explore the extent to which activists, academics, and practitioners can find a way to break the cycle of corruption caused by decades ...
Cadmium-Aluminum Layered Double Hydroxide Microspheres for Photocatalytic CO2 Reduction

Saliba, Daniel; Ezzeddine, Alaa; Sougrat, Rachid; Khashab, Niveen M.; Hmadeh, Mohamad; Al-Ghoul, Mazen (Wiley-VCH Verlag, 2016)

We report the synthesis of cadmium-aluminum layered double hydroxide (CdAl LDH) using the reaction-diffusion framework. As the hydroxide anions diffuse into an agar gel matrix containing the mixture of aluminum and cadmium ...
Calculation of ionization energy, electron affinity, and hydride affinity trends in pincer-ligated d8-Ir(tBu4PXCXP) complexes: Implications for the thermodynamics of oxidative H2 addition

Baroudi, Abdulkader; El-Hellani, Ahmad; Bengali, Ashfaq A.; Goldman, Alan S.; Hasanayn, Faraj (American Chemical Society, 2014)

DFT methods are used to calculate the ionization energy (IE) and electron affinity (EA) trends in a series of pincer ligated d8-Ir(tBu4PXCXP) complexes (1-X), where C is a 2,6-disubstituted phenyl ring with X = O, NH, CH2, ...
Calculations on the non-classical β-hydride elimination observed in trans-(H)(OMe)-Ir(Ph)(PMe3)3: possible production and reaction of methyl formate

Ataya, Mohamad; Hasanayn, Faraj (Canadian Science Publishing, 2021)

The octahedral trans hydrido-alkoxide complex trans-(H)(OMe)-Ir(Ph)(PMe3 )3 (2-OCH3 ) was prepared by Milstein and coworkers by addition of methanol to Ir(Ph)(PMe3 )3 (1). 2-OCH3 was discovered to undergo a methanol catalyzed ...
Capping of supramolecular curcubit[7]uril facilitates formation of Au nanorods during pre-reduction by curcumin

El-Kurdi, Riham; Patra, Digambara (Elsevier B.V., 2018)

Curcumin being biologically available and non-toxic natural compound is an attractive and alternative green reagent for the reduction of gold salts to elemental gold. Here, we bring new insight that shape and size of the ...
Carbon Monoxide and Small Hydrocarbon Emissions from Sub-ohm Electronic Cigarettes

El-Hellani, Ahmad; Al-Moussawi, Samira; El-Hage, Rachel; Talih, Soha; Salman, Rola; Shihadeh, Alan Louis; Saliba, Najat A. (American Chemical Society, 2019)

Electronic cigarettes (ECIGs) are routinely advertised as a safer alternative to combustible cigarettes. ECIGs have been shown to emit less toxicants than conventional cigarettes. This study presents for the first time the ...
Carboxylate Counteranions in Electronic Cigarette Liquids: Influence on Nicotine Emissions

El-Hellani, Ahmad; El-Hage, Rachel; Salman, Rola; Talih, Soha; Shihadeh, Alan Louis; Saliba, Najat A. (American Chemical Society, 2017)

The wide pH range reported for electronic cigarette (ECIG) liquids indicates that nicotine may be present in one or more chemical forms. The nicotine form affects the bioavailability and delivery of nicotine from inhaled ...
Carrier Solvents of Electronic Nicotine Delivery Systems Alter Pulmonary Surfactant

Hayeck, Nathalie; Zoghzoghi, Carl; Karam, Ebrahim; Salman, Rola; Karaoghlanian, Nareg; Shihadeh, Alan Louis; Eissenberg, Thomas E.; Zeineldine, Salah M.; Saliba, Najat A. (American Chemical Society, 2021)

In late 2019, hundreds of users of electronic products that aerosolize a liquid for inhalation were hospitalized with a variety of respiratory and gastrointestinal symptoms. While some investigations have attributed the ...
Catalysts for NOx selective catalytic reduction by hydrocarbons (HC-SCR)

Mrad, Raya; Aissat, Aissa; Cousin, Renaud; Courcot, Dominique; Siffert, Stéphane (Elsevier B.V., 2015)

This short review concerns the efficient catalysts for HC-SCR discovered more than 20 years ago. In 1990, Iwamoto proposed Cu ion-exchanged ZSM-5, and it was the first powerful catalyst for HC-SCR. This paper presents first ...
Cesium Lead Bromide Perovskites: Synthesis, Stability, and Photoluminescence Quantum Yield Enhancement by Hexadecyltrimethylammonium Bromide Doping

Tawil, Christina Al; El-Kurdi, Riham; Patra, Digambara (American Chemical Society, 2022)

Perovskite nanoparticles having a crystalline structure have attracted scientists' attention due to their great potential in optoelectronic and scintillation applications. The photoluminescence quantum yield (PLQY) is one ...
Characteristics and toxicant emissions of JUUL electronic cigarettes

Talih, Soha; Salman, Rola; El-Hage, Rachel; Karam, Ebrahim; Karaoghlanian, Nareg; El-Hellani, Ahmad; Saliba, Najat A.; Shihadeh, Alan Louis (BMJ Publishing Group, 2019)

Introduction JUUL is an electronic cigarette (ECIG) with a compact form factor. It is prefilled with a liquid that is advertised to contain a high concentration of nicotine salt. JUUL commands 50% of the US ECIG market ...
Chemical Characteristics and Brown Carbon Chromophores of Atmospheric Organic Aerosols Over the Yangtze River Channel: A Cruise Campaign

Wang, Xinke; Hayeck, Nathalie; Brüggemann, Martin; Abis, Letizia; Riva, Matthieu; Lu, Yiqun; Wang, Buwei; Chen, Jianmin; George, Christian; Wang, Lin (Blackwell Publishing Ltd, 2020)

Organic aerosols (OAs) have important influences on the climatic implications and health effects of atmospheric aerosols. Among the complex OA constituents, brown carbon (BrC) accounts for a substantial mass fraction and ...

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