King Saud University

Imam Mohammad Ibn Saud Islamic University

Nawal Ahmad Madkhali

Manal Ahmed Gasmelseed Awad

Khalid Mustafa Osman Ortashi

Awatif Ahmed Hendi

Amel Laref

Mohammad Wasef Marashdeh

Karem Abdelazim Gaber Mahmoud

Hanan Fawaz Akhdar

Hajar Abdullah Aldakhil

Islam Gamal Ibrahim Ali Alhindawy

Fatimah Yahya Mohammad Al-Abbas

Lena Jassim

A radiation shielding material for shielding against gamma radiation includes neodymium-doped zirconia nanoparticles in a matrix. The neodymium doped zirconia nanoparticles have a tetragonal crystal structure and an average size between about 25 nm to about 35 nm. The nanoparticles have a neodymium content in the range of about 1.5 mol % to about 3 mol % based on the total molar content of the zirconia nanoparticles. A method for the synthesis of neodymium-doped zirconia nanoparticles is provided. The method includes controlled metamorphosis of zirconia from monoclinic to tetragonal phase which results in a multifunctional shielding material having durability and high radiation absorption efficiency.

Gamma radiation shielding materials incorporating neodymium-doped zirconia nanoparticles and methods for preparation thereof

The synthesis of reduced graphene oxide nanoparticles includes the steps of: mixing soot with an acid to obtain a solution; adding a first oxidant gradually into the solution to oxidize the carbon source and obtain a suspension; stirring the suspension while maintaining a temperature of the suspension at about 35&#xb0; C.; raising the temperature of the suspension to about 60&#xb0; C.; adding water into the solution; adding a second oxidant into the suspension while stirring resulting in the oxidation of the carbon source to form the reduced graphene oxide nanoparticles; and isolating the resulting reduced graphene oxide nanoparticles by centrifugation. The acid is preferably an acid mixture including, for example, sulfuric acid (HSO) and phosphoric acid (HPO). The first and second oxidants can be potassium permanganate (KMnO) or hydrogen peroxide (HO).

Synthesis of reduced graphene oxide nanoparticles

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Riyadh, Saudi Arabia

Nawal Ahmad Madkhali