公开(公告)号：US11053125B2

公开(公告)日：2021-07-06

申请号：US16510080

申请日：2019-07-12

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C01B32/184

Abstract: 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° C. with a gas stream comprising at least 0.1 vol. % CH4 and at least 10 vol. % H2 to 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.

公开(公告)号：US10392267B2

公开(公告)日：2019-08-27

申请号：US15490449

申请日：2017-04-18

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C02F1/28 ,  B01J20/06 ,  B01J20/22 ,  B01J20/28 ,  B01J20/30 ,  C02F103/34 ,  C01G49/02 ,  C01G49/00

Abstract: 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.

公开(公告)号：US11203529B2

公开(公告)日：2021-12-21

申请号：US17381268

申请日：2021-07-21

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C01B32/184

Abstract: 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° C. with a gas stream comprising at least 0.1 vol. % CH4 and at least 10 vol. % H2 to 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.

公开(公告)号：US11180372B2

公开(公告)日：2021-11-23

申请号：US17359710

申请日：2021-06-28

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C01B32/184

Abstract: 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° C. with a gas stream comprising at least 0.1 vol. % CH4 and at least 10 vol. % H2 to 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.

公开(公告)号：US20210347641A1

公开(公告)日：2021-11-11

申请号：US17381268

申请日：2021-07-21

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud ELSAYED ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C01B32/184

Abstract: 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° C. with a gas stream comprising at least 0.1 vol. % CH4 and at least 10 vol. % H2 to 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.

公开(公告)号：US20180308998A1

公开(公告)日：2018-10-25

申请号：US15492267

申请日：2017-04-20

Applicant: King Abdulaziz University

Inventor： Wageh SWELM ,  Fahrettin Yakuphanoglu ,  Ahmed A. Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: H01L31/0352 ,  H01L31/0224 ,  H01L31/072 ,  H01L31/0336 ,  H01L31/18 ,  G01J1/42

CPC classification number: H01L31/035218 ,  G01J1/42 ,  G01J5/0853 ,  G01J5/28 ,  G01J2001/4266 ,  H01L31/022408 ,  H01L31/022425 ,  H01L31/0296 ,  H01L31/0336 ,  H01L31/035227 ,  H01L31/072 ,  H01L31/109 ,  H01L31/18 ,  Y02E10/50

Abstract: A photodiode comprising a photoactive spinel oxide layer is described. This photoactive spinel oxide layer forms a contact with both a light absorption layer of quantum dots, quantum wires, or quantum rods, and an inorganic substrate layer. In some embodiments, the inorganic substrate layer and the photoactive spinel oxide layer form an isotype junction. Methods of characterizing the photodiode are provided and demonstrate commercially relevant electrical and optoelectronic properties, particularly the ability to operate as a photodetector with a high photosensitivity. An economical process for preparing the photodiode is provided as well as applications.

公开(公告)号：US11320393B1

公开(公告)日：2022-05-03

申请号：US17392852

申请日：2021-08-03

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: G01N27/407 ,  G01N27/30 ,  H01L21/02 ,  B82B3/00 ,  B82Y15/00 ,  B82Y40/00

Abstract: 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.

公开(公告)号：US11215559B2

公开(公告)日：2022-01-04

申请号：US17377579

申请日：2021-07-16

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: G01N21/64 ,  B82Y15/00 ,  C09K11/07 ,  B01J20/02 ,  G01N33/18 ,  G01N31/22 ,  C02F1/28 ,  B82Y40/00 ,  C02F101/20

Abstract: A fluorescent nanocomposite which includes a thallium doped gadolinium chalcogenide having formula TlxGd1-xY, 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.

公开(公告)号：US20210054269A1

公开(公告)日：2021-02-25

申请号：US16549526

申请日：2019-08-23

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud Elsayed ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C09K11/62 ,  C09K11/08 ,  C09K11/07 ,  G01N21/64 ,  B01J20/02

Abstract: A fluorescent nanocomposite which includes a thallium doped gadolinium chalcogenide having formula TlxGd1-xY, 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.

公开(公告)号：US20210009424A1

公开(公告)日：2021-01-14

申请号：US16510080

申请日：2019-07-12

Applicant: King Abdulaziz University

Inventor： Waleed Elsayed Mahmoud ELSAYED ,  Ahmed Abdullah Salem Al-Ghamdi ,  Yusuf Abdulaziz Al-Turki

IPC: C01B32/184

Abstract: 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° C. with a gas stream comprising at least 0.1 vol. % CH4 and at least 10 vol. % H2 to 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.