King Abdulaziz University

Waleed Elsayed Mahmoud Elsayed

Ahmed Abdullah Salem Al-Ghamdi

Yusuf Abdulaziz Al-Turki

Farag Saeed Marshoud Al-Hazmi

Abdullah Yousif Abdullah Obaid

Yusef Abdulaziz Al-Turki

A method of making an array of aligned hafnium oxide nanotubes is provided. The method includes generating a first reactant gas from a first solution comprising a first hafnium precursor dissolved in a first solvent. Directing the flow of the first reactant gas over a substrate to form a seed layer that comprises particles of hafnium oxide. The method further includes generating a second reactant gas from a second solution comprising a second hafnium precursor dissolved in a second solvent. Directing the flow of the second reactant gas over the seed layer to form the array of aligned hafnium oxide nanotubes substantially perpendicular on a surface of the substrate. A method of using the array of aligned hafnium oxide tubes for detection of toxic gases in a gas sample is also provided.

Gas sensor for detection of toxic gases

A fluorescent nanocomposite which includes a thallium doped gadolinium chalcogenide having formula TlGdY, wherein x is 0.01 to 0.1, and Y is selected from the group consisting of S, Se, or Te, and a benzothiazolium salt bound to a surface of the thallium doped gadolinium chalcogenide. A method of detecting antimony ions in a fluid sample whereby the fluid sample is contacted with the fluorescent nanocomposite to form a mixture, and a fluorescence emission profile of the mixture is measured to determine a presence or absence of antimony ions in the fluid sample, wherein a reduction in intensity of a fluorescence emissions peak associated with the fluorescent nanocomposite indicates the presence of antimony ions in the fluid sample.

Thallium doped gadolinium chalcogenide nanocomposite

Quantum dot nanocomposite containing benzothiazolium

Thallium-gadolinium-chalcogenide nanodot composition

Methods of forming graphene may include reacting a dispersed mixture, comprising fly ash, a charged heteroaromatic compound, particularly a pyridinium compound, such as a 1-(4-pyridyl)-pyridinium salt, and a solvent, particularly an alcohol, such as ethanol, with a polymeric oxidizing agent, preferably polymer-supported pyridinium chlorochromate, to form a second mixture; and contacting the second mixture at a temperature of 120 to 180&#xb0; C. with a gas stream comprising at least 0.1 vol. % CHand at least 10 vol. % Hto form graphene on the fly ash. Methods of managing waste may comprise using fly ash waste to produce graphene. Devices for implementing such methods may involve steel cylindrical reaction vessels including a cover through which a valve-stoppable pipe is fed, which reaction vessel is at least partially surrounded by a heating device, and suitable for handling solvent and fly ash, as well as for receiving gas inflow through the pipe.

Sealed reactor method for forming graphene

Method for making graphene from methane and hydrogen

Method of detecting antimony ions and method of removing antimony ions using a fluorescent nanocomposite

Fly ash-catalyzed method for making graphene

Graphene from fly ash

Three dimensional (3D), porous, Sr(II)/Ir(III) layered double hydroxide materials with a spherical/balls like shape, are composed of nanohexagonal sheets intercalated with 1-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid have a number of uses including removing undesirable organic compounds and materials from polluted water. This removal can be accomplished without disturbing the pH of the water, and with high absorption capacity (2000 mg of pollutants/1 mg of LDH). The spherical/ball like materials are easily cleaned and are amenable to being reused several times.

Synthesis of 3D-porous Sr(II)/Ir(III) layered hydroxide balls composed of hexagonal sheets for water purification

A luminescent nanocomposite is provided comprising nanosheets comprising a transition metal selected from the group consisting of molybdenum and tungsten; a chalcogen element; and a rare earth element; and a beta-lactam dye disposed upon a surface of the nanosheets. Methods of using the luminescent nanocomposite to detect and remove mercury (II) ions from a fluid sample are also provided.

Luminescent nanocomposite for ultrasensitive detection of mercury

Process for forming graphene-coated particles

Antimony adsorbent

A nanostructured material having a coral reef morphology of nanoflake walls is described. The nanostructured material comprises a Fe(II)/Fe(III) layered double hydroxide intercalated with an azo dye, and a synthesis method is discussed. The nanostructured material may be used to remove a contaminant from a solution by adsorption. The nanostructured material may be cleaned and reused with high adsorption efficiency.

Azo dye intercalated Fe(II)/Fe(III) layered double hydroxide for water purification

A star-shape nanoparticle that adsorbs arsenic in a solution, a method of producing the star-shape nanoparticle, and a method of determining an arsenic concentration in an arsenic-containing solution via the star-shape nanoparticle and fluorescence spectroscopy are provided. Various embodiments of the star-shape nanoparticle, the method of producing thereof, and the method of using thereof to determine an arsenic concentration in a solution are also provided.

Growing community of inventors

Jeddah, Saudi Arabia

Waleed Elsayed Mahmoud Elsayed