Browsing Department of Chemistry by Title

Now showing items 154-173 of 357

Glutathione-capped CuO nanoparticles for the determination of cystine using resonance Rayleigh scattering spectroscopy

Qasem, Mayada; El-Kurdi, Riham; Patra, Digambara (Springer, 2020)

Ascorbic acid was used to reduce cystine to cysteine that induces the aggregation of glutathione-capped copper oxide nanoparticles. The aggregation of CuO NPs was optimized through resonance Rayleigh scattering and dynamic ...
Gold and silver nanoparticles in resonance Rayleigh scattering techniques for chemical sensing and biosensing: a review

El-Kurdi, Riham; Patra, Digambara (Springer-Verlag Wien, 2019)

This review (with 116 refs.) summarizes the state of the art in resonance Rayleigh scattering (RRS)-based analytical methods. Following an introduction into the fundamentals of RRS and on the preparation of metal nanoparticles, ...
Gold nanoparticles functionalized with Pluronic are viable optical probes for the determination of uric acid

El-Kurdi, Riham; Patra, Digambara (Springer-Verlag Wien, 2018)

The authors describe the preparation of gold nanoparticles (AuNPs) coated with poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (Pluronic F-108) by reducing Au3+ to Au0 using curcumin, a natural ...
Gold nanoparticles-coated polystyrene beads for the multiplex detection of viral DNA

Fakih, Hassan H.; Itani, Malek M.; Karam, Pierre (Elsevier B.V., 2017)

We report on the preparation of a sensing platform for the fast multiplex detection of short oligonucleotide sequences. Monodispersed micro-sized polystyrene beads (average diameter of ca. 4.72 μm) were prepared and ...
Green solid-state based curcumin mediated rhamnolipids stabilized silver nanoparticles: Interaction of silver nanoparticles with cystine and albumins towards fluorescence sensing

Sadeq Al-Namil, Dina; Patra, Digambara (Elsevier B.V., 2019)

Curcumin mediated rhamnolipids stabilized Ag Nanoparticles (NPs) have been successfully synthesized in a green solid-state procedure and in a solvent free environment. Depending on growth time, the synthesis process offers ...
Green Synthesis of Curcumin Conjugated CuO Nanoparticles for Catalytic Reduction of Methylene Blue

Qasem, Mayada; El-Kurdi, Riham; Patra, Digambara (Wiley-Blackwell, 2020)

A novel simple green synthesis route was applied to produce copper oxide (CuO) nanoparticles (NPs) and CuO nanograins (NGs) by using cupric chloride dihydrated as copper salt precursor, curcumin (a natural and non-toxic ...
Green synthesis of curcumin conjugated nanosilver for the applications in nucleic acid sensing and anti-bacterial activity

El Khoury, Elsy D.; Abiad, Mohamad G.; Kassaify, Zeina G.; Patra, Digambara (Elsevier, 2015)

Silver nanoparticles (Ag NPs) are often synthesized by chemical and physical methods. Natural and non-toxic molecules are recently being replaced for nanoparticles preparation. In this paper we have used curcumin, which ...
H2 Addition to Pincer Iridium Complexes Yielding trans-Dihydride Products: Unexpected Correlations of Bond Strength with Bond Length and Vibrational Frequencies

Omar, Boushra Srour; Mallah, Josephina; Ataya, Mohamad; Li, Bo; Zhou, Xiaoguang; Malakar, Santanu; Goldman, Alan S.; Hasanayn, Faraj (American Chemical Society, 2018)

R4PONOP-Ir-Me (R1) and R4POCOP-Ir-CO (R2), R = tBu or iPr, are known to undergo acid-catalyzed oxidative addition of H2 that yields octahedral products with two hydrides in a trans-configuration. We use density functional ...
Heterocycle-to-heterocycle route to quinoline-4-amines: Reductive heterocyclization of 3-(2-nitrophenyl)isoxazoles

Coffman, Keith C.; Duong, Vy; Bagdasarian, Alex L.; Fettinger, James C.; Haddadin, Makhluf J.; Kurth, Mark J. (Wiley-VCH Verlag, 2014)

A variety of quinoline-4-amines were synthesized from substituted 3-(2-nitrophenyl)isoxazoles utilizing Zn0 or Fe0 dust and HOAc using a reductive heterocyclization process. The starting isoxazoles were synthesized from ...
High Activity and Selectivity for Catalytic Alkane-Alkene Transfer (De)hydrogenation by (tBuPPP)Ir and the Importance of Choice of a Sacrificial Hydrogen Acceptor

Gordon, Benjamin M.; Parihar, Ashish; Hasanayn, Faraj; Goldman, Alan S. (American Chemical Society, 2022)

The triphosphorus-coordinating pincer iridium fragment (tBuPPP)Ir was recently reported to be highly active for the catalytic dehydrogenation of n-alkanes. Dehydrogenation is calculated to be highly regioselective for the ...
High photo-currents with a zwitterionic thiocyanate-free dye in aqueous-based dye sensitized solar cells

Fayad, Remi; Shoker, Tharallah A.; Ghaddar, Tarek H. (Royal Society of Chemistry, 2016)

We report a new water soluble and stable thiolate/disulfide redox couple (T-/DS) and its use with a new zwitterionic and thiocyanate-free dye (T169) in a 100% aqueous electrolyte system. A DSSC incorporating T169 and the ...
High photo-currents with a zwitterionic thiocyanate-free dye in aqueous-based dye sensitized solar cells

Fayad, R.; Shoker, T.A.; Ghaddar, T.H. (Royal Society of Chemistry, 2016)

We report a new water soluble and stable thiolate/disulfide redox couple (T-/DS) and its use with a new zwitterionic and thiocyanate-free dye (T169) in a 100% aqueous electrolyte system. A DSSC incorporating T169 and the ...
Higher stability and better photoluminescence quantum yield of cesium lead iodide perovskites nanoparticles in the presence of CTAB ligand

Al-Tawil, Christina; El-Kurdi, Riham; Patra, Digambara (Springer Nature, 2023)

Inorganic halide perovskites, such as CsPbI3, have unique optoelectronic properties which made them promising candidates for several applications. Unfortunately, these perovskites undergo rapid chemical decomposition and ...
Highly Efficient Ambient Temperature CO2 Photomethanation Catalyzed by Nanostructured RuO2 on Silicon Photonic Crystal Support

Ali, Feysal M.; Ghuman, Kulbir Kaur; O'Brien, Paul G.; Hmadeh, Mohamad; Sandhel, Amit; Perović, Douglas D.; Singh, C. V.; Mims, Charles A.; Ozin, Geoffrey A. (John Wiley and Sons Inc, 2018)

Sunlight-driven catalytic hydrogenation of CO2 is an important reaction that generates useful chemicals and fuels and if operated at industrial scales can decrease greenhouse gas CO2 emissions into the atmosphere. In this ...
Highly porous and photoluminescent pyrene-quinoxaline-derived benzimidazole-linked polymers

Altarawneh, Suha S.; Nahar, Lamia; Arachchige, Indika U.; El-Ballouli, A. O.; Hallal, Kassem M.; Kaafarani, Bilal R.; Rabbani, Mohammad Gulam; Arvapally, Ravi K.; El-Kaderi, Hani M. (Royal Society of Chemistry, 2015)

Two highly porous and semiconducting pyrene-quinoxaline-derived benzimidazole-linked polymers have been synthesized and fully characterized. The polymers have a high surface area (SABET = ∼950 m2 g-1) while their electronic ...
Highly robust tetrazolate based complexes for efficient and long-term stable dye sensitized solar cells

Shoker, Tharallah A.; Tanios, Ralph; Fayad, Remi; Ghaddar, Tarek H. (Royal Society of Chemistry, 2015)

We report a new family of ruthenium poly-pyridyl complexes that bear tetrazolate based ligands (either bi-chelate as in T162 or tri-chelate as in T120 and T147), along with their spectroscopic, electrochemical, and theoretical ...
Hot Wires and Film Boiling: Another Look at Carbonyl Formation in Electronic Cigarettes

Talih, Soha; Salman, Rola; Karam, Ebrahim; el-Hourani, Mario G.; El-Hage, Rachel; Karaoghlanian, Nareg; El-Hellani, Ahmad; Saliba, Najat A.; Shihadeh, Alan Louis (American Chemical Society, 2020)

Electronic cigarettes (ECIGs) are a class of tobacco products that emit a nicotine-containing aerosol by heating and vaporizing a liquid. Apart from initiating nicotine addiction in nonsmokers, a persistent concern about ...
Hybrid CaO/Al2O3 aerogel as heterogeneous catalyst for biodiesel production

Kesserwan, Fatima; Ahmad, Mohammad N.; Khalil, Mahmoud; El-Rassy, Houssam (Elsevier B.V., 2020)

We report a new hybrid CaO/Al2O3 aerogel and its application as a heterogeneous catalyst for the production of biodiesel. These catalysts were successfully prepared for the first time via the rapid epoxide-initiated sol-gel ...
Impact of flavors and humectants on waterpipe tobacco smoking topography, subjective effects, toxicant exposure and intentions for continued use

Wagener, Theodore Lee; Leavens, Eleanor Ladd Schneider; Mehta, Toral; Hale, Jessica J.; Shihadeh, Alan Louis; Eissenberg, Thomas E.; Halquist, Matthew Sean; Brinkman, Marielle C.; Johnson, Amanda Lee; Floyd, Evan L.; Ding, Kai; El-Hage, Rachel; Salman, Rola (BMJ Publishing Group, 2021)

Introduction The present study examined how the lack of characterising flavours and low levels of humectants may affect users' waterpipe tobacco (WT) smoking topography, subjective effects, toxicant exposure and intentions ...
Impact of smoking intensity and device cleaning on IQOS emissions: comparison with an array of cigarettes

Ardati, Ola; Adeniji, Ayomipo; El-Hage, Rachel; Salman, Rola; El-Kaassamani, Malak; Yassine, Amira; Talih, Soha; Hourani, Mario El; Karaoghlanian, Nareg; Breland, Alison B.; Eissenberg, Thomas E.; Saliba, Najat A.; Shihadeh, Alan Louis; El-Hellani, Ahmad (BMJ Publishing Group, 2023)

Significance: IQOS is a heated tobacco product that has been widely advertised by Philip Morris International (PMI) as a reduced-exposure product compared with cigarettes. Reduced exposure results from reduced emission of ...

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