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Jeddah, Saudi Arabia

Asiri A.M.,King Abduaziz University | Al-Amoudi M.S.,Taif University | Al-Talhi T.A.,Taif University | Al-Talhi A.D.,Taif University
Journal of Saudi Chemical Society | Year: 2011

Titanium dioxide nanoparticles are used in various applications, including environmental photocatalysis, solar cells and memory devices. In this study, we present the photodegradation of Rhodamine 6G and phenol red, employing heterogeneous photocatalytic process under solar irradiation. The experiments were carried out to study the effects of various parameters (i.e. the effect of the anchoring groups on the catalyst, concentration of the n-TiO2 semiconductor). The n-TiO2 was synthesized by a sol-gel process and characterized by SEM. When samples of n-TiO2 of different sizes were encapsulated with eriochromycine dye the quantum size effect is observed in the visible region of the spectrum. The rate of degradation was estimated from the residual concentration spectrophotometrically. Phenol red showed higher degradation than Rhodamine 6G which can be attributed to its sulfonic and hydroxyl anchoring groups. The photodegradation showed pseudo-first-order kinetics. © 2010. Source


Alshaery A.A.,King Abduaziz University
Life Science Journal | Year: 2012

In this paper, an iterative method of arbitrary order of convergence (p ≥ 2) is developed for solving the universal Lambert's problem using homotopy continuation technique. The method does not need any priori knowledge of the initial guess, a property which avoids the critical situation between divergent to very slow convergent solution, that may exist in the application of other numerical methods depending on initial guess. Computational algorithms and numerical applications will b e applied for some orbits. Source


Asiri A.M.,King Abdulaziz University | Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 16H 13ClN 2S, the mean planes fitted through all non-H atoms of the heterocyclic fivemembered and the benzene rings are oriented at a dihedral angle of 5.19 (7)°. In the crystal, a weak C - H⋯π interaction occurs, along with weak π-π interactions [cenroidcentroid distance = 3.7698 (11) Å]. Source


Asiri A.M.,King Abdulaziz University | Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 16H 13ClN 2S, the dihedral angle between the 4-chlorobenzaldehyde moiety and the heterocyclic fivemembered ring is 7.21 (17)°. In the crystal, molecules are linked by weak C - H⋯π interactions, generating [100] chains. Source


Asiri A.M.,King Abduaziz University | Khan S.A.,King Abduaziz University | Tahir M.N.,University of Sargodha
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 13H 12N 2O 3, the dihedral angle between the aromatic rings is 7.94 (12)°. In the crystal, inversion dimers linked by pairs of C - H⋯O hydrogen bonds generate R 2 2(6) loops. Weak π-π [centroidcentroid separations = 3.7480 (13) and 3.9047 (13) Å] and C - H⋯π interactions help to consolidate the packing. Source

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