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Now showing items 127-146 of 244

Large Enhancement of Dye Sensitized Solar Cell Efficiency by Co-sensitizing Pyridyl- and Carboxylic Acid-Based Dyes

Hilal, H.M.; El Bitar Nehme, M.A.; Ghaddar, T.H. (American Chemical Society, 2018)

Co-sensitization is an attractive approach to enhance the light-harvesting efficiency of a dye sensitized solar cell (DSSC), whereby two or more dyes having complementary absorption spectra are co-adsorbed within a DSSC. ...
Levels and indoor-outdoor relationships of PM10 and soluble inorganic ions in Beirut, Lebanon

Saliba N.A.; Atallah M.; Al-Kadamany G. (NEW YORK360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA, 2009)

PM10, which is considered among the major indoor and outdoor pollutants, was measured in several residential homes and corresponding outdoor environments in the Great Beirut area over the summer and winter seasons of 2005. ...
Liesegang banding and multiple precipitate formation in cobalt phosphate systems

Karam T.; El-Rassy H.; Zaknoun F.; Moussa Z.; Sultan R. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2012)

We study a cobalt phosphate Liesegang pattern from cobalt(II) and phosphate ions in a 1D tube. The system yields a complex, multi-component pattern. Characterization of the different precipitates by FTIR, SEM and XRD reveals ...
Mass concentration and ion composition of coarse and fine particles in an urban area in Beirut: Effect of calcium carbonate on the absorption of nitric and sulfuric acids and the depletion of chloride

Kouyoumdjian H.; Saliba N.A. (KATLENBURG-LINDAUMAX-PLANCK-STR 13, 37191 KATLENBURG-LINDAU, GERMANY, 2006)

Levels of coarse (PM10-2.5) and fine (PM2.5) particles were determined between February 2004 and January 2005 in the city of Beirut, Lebanon. While low PM mass concentrations were measured in the rainy season, elevated ...
Mechanism of revert spacing in a PbCrO 4 Liesegang system

Karam T.; El-Rassy H.; Sultan R. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2011)

Periodic precipitation of sparingly soluble salts yields parallel Liesegang bands in 1D whose spacings obey either one of two known trends. The overwhelming trend is an increase in spacing as we move away from the junction, ...
Mercury removal from aqueous solutions using silica, polyacrylamide and hybrid silica-polyacrylamide aerogels

Ramadan H.; Ghanem A.; El-Rassy H. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2010)

Mercury(II) ions adsorption from aqueous solutions onto silica, polyacrylamide, and hybrid silica-polyacrylamide aerogels is studied. The aerogels structure was verified by FTIR spectroscopy and their texture by nitrogen ...
Metal-Organic Framework Photocatalyst Incorporating Bis(4′-(4-carboxyphenyl)-terpyridine)ruthenium(II) for Visible-Light-Driven Carbon Dioxide Reduction

Elcheikh Mahmoud, M.; Audi, H.; Assoud, A.; Ghaddar, T.H.; Hmadeh, M. (American Chemical Society, 2019)

In this study, we report the successful incorporation of the photoactive bis(4′-(4-carboxyphenyl)-terpyridine)ruthenium(II) (Ru(cptpy)2) strut into a robust metal-organic framework (MOF), AUBM-4. The single crystal X-ray ...
Methylene blue discoloration by heated persulfate in aqueous solution

Ghauch A.; Tuqan A.M.; Kibbi N.; Geryes S. (LAUSANNEPO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2012)

Advanced oxidation process based on thermally activated sodium persulfate (SPS) is used in this work to degrade methylene blue (MB). The impact of temperature (30-70°C), MB concentration (15.6-311.8μM), SPS load (1-100mM) ...
Modeling the Permeability Loss of Metallic Iron Water Filtration Systems

Care S.; Crane R.; Calabro P.S.; Ghauch A.; Temgoua E.; Noubactep C. (HOBOKEN111 RIVER ST, HOBOKEN 07030-5774, NJ USA, 2013)

Over the past 30 years the literature has burgeoned with in situ approaches for groundwater remediation. Of the methods currently available, the use of metallic iron (Fe0) in permeable reactive barrier (PRB) systems is one ...
Morphology and photoelectrical properties of solution processable butylamine-modified graphene- and pyrene-based organic semiconductor

Bon S.B.; Valentini L.; Moustafa R.M.; Jradi F.M.; Kaafarani B.R.; Verdejo R.; Lopez-Manchado M.A.; Kenny J.M. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2010)

The morphological and electrical properties of 2,11-di-tert-butyl-6,7,15, 16-tetrakis(hexylthio)quinoxalino[2',3':9,10]phenanthro[4,5-abc]phenazine (TQPP) organic molecule combined with butylamine (BAM)-modified graphene ...
Morphology of a 2D Mg2 + - NH4 OH Liesegang pattern in zero, positive and negative radial electric field

Badr L.; El-Rassy H.; El-Joubeily S.; Sultan R. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2010)

We report experiments with novel features in periodic precipitation (Liesegang banding), in Mg(OH)2 systems. Experiments in the absence of an electric field yield a set of white rings consistent with the 1D observations ...
Morphology, particle size distribution, and composition in one- and two-salt metal oxinate Liesegang patterns

Mandalian L.; Fahs M.; Al-Ghoul M.; Sultan R. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2004)

Precipitate systems consist of particles of various sizes distributed in space. The determination of the particle size distribution (PSD) in a precipitate allows a better understanding of the spatio-temporal dynamics of ...
Multiphase growth and electronic structure of ultrathin hexaazatrinaphthylene on Au(111)

Ha S.D.; Kaafarani B.R.; Barlow S.; Marder S.R.; Kahn A. (, 2007)

Scanning tunneling microscopy was used to study the morphological behavior of 1-2 monolayers (ML) of 5,6,11,12,17,18-hexaazatrinaphthylene (HATNA) deposited on Au(111). The first ML consisted of molecules flat on the ...
N,N-bond-forming heterocyclization: Synthesis of 3-alkoxy-2H-indazoles

Mills A.D.; Nazer M.Z.; Haddadin M.J.; Kurth M.J. (WASHINGTON1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2006)

A one-step heterocyclization of o-nitrobenzylamines to 3-alkoxy-2H- indazoles is reported. The electronic nature of the nitrophenyl group, the steric and electronic nature of the R1-functionalized benzylic amine, and the ...
Nanoparticle assembled microcapsules for application as pH and ammonia sensor

Amali A.J.; Awwad N.H.; Rana R.K.; Patra D. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2011)

The encapsulation of molecular probes in a suitable nanostructured matrix can be exploited to alter their optical properties and robustness for fabricating efficient chemical sensors. Despite high sensitivity, simplicity, ...
Nanostructured Electrodes Assembled from Metal Nanoparticles and Quantum Dots in Polyelectrolytes

Halaoui L. (Wiley-VCH;, 2012)

[No abstract available]
New 1,6-heptadienes with pyrimidine bases attached: Syntheses and spectroscopic analyses

Hammud H.H.; Ghannoum A.M.; Fares F.A.; Abramian L.K.; Bouhadir K.H. (AMSTERDAMPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2008)

A simple, high yielding synthesis leading to the functionalization of some pyrimidine bases with a 1,6-heptadienyl moiety spaced from the N - 1 position by a methylene group is described. A key step in this synthesis ...
New hydrogen-evolution heteronanostructured photocatalysts: Pt-Nb 3O7(OH) and Cu-Nb3O7(OH)

Hmadeh M.; Hoepfner V.; Larios E.; Liao K.; Jia J.; Jose-Yacaman M.; Ozin G.A. (Wiley-VCH Verlag; WEINHEIMBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY, 2014)

Nanorods of triniobium hydroxide heptaoxide, Nb3O 7(OH), were synthesized by means of a hydrothermal method. Subsequently, Pt and CuO nanoparticles were introduced on the surface of Nb 3O7(OH) nanorods by a microwave-assisted ...
New organic semiconductors and their device performance as a function of thiophene orientation

Wex B.; Kaafarani B.R.; Schroeder R.; Majewski L.A.; Burckel P.; Grell M.; Neckers D.C. (CAMBRIDGETHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND, 2006)

We report a first investigation of two new isomer-pure thieno[f,f′] bis[1]benzothiophenes, i.e. syn and anti with respect to the orientation of the thiophenes along the long axis of the molecule, applied as organic ...
New pyridyl-based dyes for co-sensitization in dye sensitized solar cells

El Bitar Nehme, V.A.; El Bitar Nehme, M.A.; Ghaddar, T.H. (Elsevier Ltd, 2019)

Co-sensitization is very advantageous in increasing a dye sensitized solar cell's (DSSC)efficiency. It relies on sensitizing the same titania film with two dyes that have complementary absorption spectra. In this report ...

Now showing items 127-146 of 244

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Browsing Department of Chemistry - Faculty Publications by Title

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