Abstract Mantle metasomatism is an important process in subduction zones which fluids from the dehydrating oceanic slab interact with overlying upper mantle resulting a chemical alteration of mantle. Consequently, this fluid-rock interaction may influence rock's physical properties such as deformation behavior. In order to study element redistribution during laboratory, we used simplified model...

Cell adhesion, migration, and proliferation are significantly affected by the surface topography of the substrates on which the cells are cultured. Alumina is one of the most popular implant materials used in orthopedics, but few data are available concerning the cellular responses of mesenchymal stem cells (MSCs) grown on nanoporous structures. MSCs were cultured on smooth alumina substrates a...

Abstract Metallurgical grade alumina is produced worldwide through the well-known Bayer process, which unavoidably generates bauxite residue (BR, also known as red mud) in almost equal amounts to alumina. This study aims valorization of BR a smelting-reduction process obtain calcium aluminate slags that can be proper feed for recovery via Pedersen process. It investigates thermodynamics and cha...

Nanoporous alumina membranes exhibit high pore densities, well-controlled and uniform pore sizes, as well as straight pores. Owing to these unusual properties, nanoporous alumina membranes are currently being considered for use in implantable sensor membranes and water purification membranes. Atomic layer deposition is a thin-film growth process that may be used to modify the pore size in a nan...

Among challenges implicit in the transition to post–fossil fuel energetic model, finite amount of resources available for technological implementation CO2 revalorizing processes arises as a central issue. The development fully renewable catalytic systems with easier metal recovery strategies would promote viability and sustainability synthetic natural gas production circular routes. Taking Ni N...

The effect of the tundish flux on evolution non-metallic inclusions in Si-killed 304 (18%Cr-8%Ni) stainless steel has been investigated at 1773 K. interfacial reaction between molten and CaO–Al2O3–MgO causes aluminum pick-up from liquid slag into melt, resulting a decrease oxygen content steel. originating modifies pre-existing Mn-silicate alumina-rich Because decreases as it reacts with flux, ...

R.M. Nascimento a,∗, A.E. Martinelli a, A.J.A. Buschinelli b, E. Sigismund c,1 a Universidade Federal do Rio Grande do Norte, Departamento de Engenharia de Materiais, CP. 1524, Campus Lagoa Nova, Natal, RN 59072-970, Brazil b Universidade Federal de Santa Catarina, Departamento de Engenharia Mecânica, Laboratório de Soldagem, Labsolda, CP. 476 Campus Trindade, Florianópolis, SC, Brazil c Forsch...

The paper reports a process for synthesis of γ-alumina from kaolin. Kaolin was transformed to meta-kaolin by calcination at 800 ̊C for 2h. γ-alumina powder was synthesized through extracting alumina from metakaolin via H2SO4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900 ̊...

Many pioneers from around the world followed this initial experience but long-term results and good methodology were lacking. Recently, a number of reports 4-6 have focused attention again on an alumina-on-alumina combination. More than 30 years after its introduction into clinical practice, this article considers the current information on the alumina-on-alumina combination from both experimen...

A new rapid, very simple and one-step sol-gel strategy for the large-scale preparation of highly porous γ-Al₂O₃ is presented. The resulting mesoporous alumina materials feature high surface areas (400 m² g-1), large pore volumes (0.8 mL g-1) and the γ-Al₂O₃ phase is obtained at low temperature (500 °C). The main advantages and drawbacks of different preparations of mesoporous alumina materials ...