Water-vapor adsorption on poorly crystalline boehmite (PCB) was studied using a gravimetric FTIR apparatus that measured FTIR spectra and water adsorption isotherms simultaneously. The intensity of the delta(HOH) band of adsorbed water changed linearly with water content and this linear relationship was used to determine the dry mass of the sample. Adsorption and desorption isotherms of PCB sho...

Introduction: The presence of subsurface water ice on Mars has now been recognized by several instruments, including in situ observation by the Phoenix Lander in high-latitude region [1]. This ice could represent a significant water reservoir and might participate actively in the global Mars water cycle [2]. Subsurface water ice is supposed to be buried below an ice-free regolith layer, produce...

Multiwall carbon nanotubes, prepared by chemical vapor deposition, have an average diameter of 60-100 nm as shown by High Resolution Transmittance Electron Microscope, HR-TEM. The Multiwall carbon nanotubes (MWCNTs) were further characterized using X-ray Diffraction and Raman Spectroscopy. Mercury uptake capacity of MWCNTs was studied using batch adsorption method at different concentration ran...

An investigation was made to correlate between amount of oxygen complex present on activated carbon and its water adsorption behavior. Activated carbon was oxidized with HNO3 at 340 K for 30 hours, followed by a subsequent pre-heat treatment under argon atmosphere for 8 hours at various temperatures in order to remove oxygen complexes progressively on the oxidized activated carbon. The types an...

We have performed molecular dynamics simulations at constant temperature and pressure to calculate the solubility of carbon dioxide (CO2) and hydrogen sulfide (H2S) in water. The solubility of gases in water is important in several technological problems, in particular in the petroleum industry. The calculated liquid densities as function of temperature are in good agreement with experimental d...

An optical method to determine the nanostructure and the morphology of porous thin films is presented. This procedure is based on the response of a side-polished optical fiber with the film under study, when an adsorption-desorption cycle is carried out. Spectroscopic ellipsometry provides additional information about the optical properties and adsorption behavior of the film. Pore size distrib...