Topological characterization of 3D molecular structures is an emerging study area in theoretical and computational chemistry. These structural descriptors are used a variety domains, including chemical graph theory, drug delivery, nanomaterial characterization. Quantitative can be to characterize the physical properties given compound. indices graphs numerical quantities that allow us collect i...

In this study, the removal of cadmium and lead ions from aqueous solution by nanocrystalline magnetite was investigated. The nanocrystalline magnetite was synthesized by mechanochemical activation of hematite in a high energy planetary mill in argon atmosphere for 45 hours. The ability of the synthesized nanocrystalline magnetite for removal of Cd(II) and Pb(II) from aqueous solutions was studi...

Natural zeolites are commonly described as macromolecular sieves. Zeolite networks very trendy chemical due to their low-cost implementation. Sodalite network is one of the most studied types zeolite networks. It helps in removal greenhouse gases. To study this rich network, we use an authentic mathematical tool known M-polynomials topological index and show some physical properties numerical f...

Nanocrystalline materials show a higher strain-rate sensitivity in contrast to the conventional coarse-grained materials and a different grain size dependency. To explain these phenomenon, a finite element model is constructed that considers both grain interior and grain boundary deformation of nanocrystalline materials. The model consist of several crystalline cores with different orientations...

In-situ synthesis of a zeolite with encapsulated Pt was conducted to prepare a sulfur-resistant noble metal catalyst based on concepts of shape selectivity and hydrogen spillover. The prepared zeolite was of the sodalite type, in which the pore openings allow H2 to enter the pores but not H2S. Chemisorption with H2/CO was conducted to verify the most of Pt atoms distribution in the cage of Pt/S...

mineral dissolution and precipitation may occur. The effect of alkaline solutions on the transformation of Buried waste storage tanks at the USDOE Hanford Reservation clay minerals has been the subject of intensive research in Washington State have released solutions containing high concentrations of Na, OH, NO3, and Al into the vadose zone. When such (Cuadros and Linares, 1996; Bauer and Berge...

A lower limit for the grain size of nanocrystalline solids obtained by crystallization of the glass and its dependency on the crystallization temperature are thermodynamically considered. It is found that the nanocrystalline materials have the smallest grain size when the crystallization temperature is roughly half of the melting temperature. At this temperature, the Gibbs free energy differenc...

nanocrystalline ceria has been considered as support for carbon monoxide preferentially oxidation. in this study ceria was prepared by precipitation method and the effects of preparation conditions, such as ph of solution (8-10), aging time (1-12 hr), drying temperature (80-120 °c), calcination time (2-6 hr) and temperature (400-600 °c) were investigated on ceria synthesized powders properties....