The aim of this research is to synthesise carbon aerogels and to compare the differences in their textural, morphological and chemical properties when synthesised in basic and acidic media, and with two different types of pretreatment carbonization and activation with CO2. Four samples are prepared and characterised using TGA-DTA, SEM, DRX, isotherm determination of N2 adsorption-desorption at ...

General procedures. All reactions were carried out under an inert nitrogen atmosphere with dry solvents under anhydrous conditions unless otherwise stated. Dry tetrahydrofuran (THF), toluene, benzene, dichloromethane (CH2Cl2), methanol (MeOH), N,N-dimethylformamide (DMF), and triethylamine (Et3N) were obtained by passing these previously degassed solvents through activated alumina columns. Reag...

Understanding how various redox activities evolve and distribute in disordered rocksalt oxides (DRX) can advance insights into manipulating materials properties for achieving stable, high-energy batteries. Herein, the authors present reaction kinetics spatial distribution of are governed by particle size DRX materials. The size-dependent electrochemical performance is attributed to distinct cat...

PURPOSE To quantify dose mapping errors (DMEs) of a point-based dose mapping method for 4D lung treatment plans. METHODS Point-based dose mapping methods utilize deformation vector fields (DVFS) to interpolate dose from a deformed image. Volume-based dose mapping methods consider the volume overlap between deformed and reference voxels; defining dose as the integral energy divided by the inte...

Compression creep tests were performed on the ternary 91.84Sn-3.33Ag-4.83Bi (wt.%, abbreviated Sn-Ag-Bi) Pb-free alloy. The test temperatures were: −25 °C, 25 °C, 75 °C, 125 °C, and 160 °C (± 0.5 °C). Four loads were used at the two lowest temperatures and five at the higher temperatures. The specimens were tested in the as-fabricated condition or after having been subjected to one of two air a...

Throughout the process of coal extraction from surface mines, gases and particles are emitted in the form of fugitive emissions by activities such as hauling, blasting and transportation. As these emissions are diffuse in nature, estimations based upon emission factors and dispersion/advection equations need to be measured directly from the atmosphere. This paper expands upon previous research ...

The study of nucleation mechanism of new grains during severe plastic deformation of magnesium alloys is of great importance to control the characteristics of final microstructures.  To investigate the role of discontinuous recrystallization, a wrought AZ31 magnesium alloy was deformed by accumulative back extrusion process at 330 °C.  The obtained microstructures were studied using optical and...

The characterization of microstructure and texture development binary Mg-0.3Ce (wt%) after equal-channel angular pressing (ECAP) processing via route Bc at 300 350 °C through 4 passes were investigated using electron backscatter diffraction (EBSD) measurements. results demonstrated an effective grain refinement from millimeter range to 6.7 8.3 μm obtained °C, respectively. was dynamic recrystal...

A oxidação catalítica da casca de arroz é uma rota alternativa para obter produtos químicos valor agregado. Nesse trabalho foi estudada a com peróxido hidrogênio usando óxidos ferro, cobalto e titânio como catalisador. Esses catalisadores foram caracterizados por Difratometria Raios X (DRX) Redução Hidrogênio à Temperatura Programada (TPR-H2). Nos ensaios catalíticos, conversão concentração áci...