The desorption of molecular ices from grain surfaces is important in a number of astrophysical environments including dense molecular clouds, cometary nuclei and the surfaces and atmospheres of some planets. With this in mind, we have performed a detailed investigation of the desorption of pure water, pure methanol and pure ammonia ices from a model dust-grain surface. We have used these result...

The moisture sorption isotherms of Clinacanthus nutans (C. nutans) herbal leaves were established at three different temperatures 30°C, 40°C, and 50°C, water activity between 0.3–0.9 using a static gravimetric method. results showed that equilibrium content C. increased with increasing constant temperature for both desorption adsorption isotherms. In contrast, the decreased when all exhibited T...

Temperature programed desorption has been used to study the desorption kinetics and desorption energies of a set of alcohols and fluorinated alcohols adsorbed on an a-CHx film. The alcohols serve as models for the hydroxyl end groups of Fomblin Zdol, the lubricant most commonly used with the amorphous carbon overcoats sputtered onto the surfaces of magnetic data storage disks. Temperature progr...

Wehave undertaken a detailed investigation of the adsorption, desorption and thermal processing of the astrobiologically significant isomers glycolaldehyde, acetic acid andmethyl formate. Here, we present the results of laboratory infrared and temperature programmed desorption (TPD) studies of the three isomers from model interstellar ices adsorbed on a carbonaceous dust grain analogue surface....

differential scanning calorimetry (dsc), temperature programmed desorption mass spectrometry (tpd-ms) and small angle neutron scattering (sans) were used to investigate co2 uptake by the wyodak coal. adsorption of carbon dioxide on wyodak coal was studied by dsc. the exotherms evident at low temperatures are associated with the uptake of co2 suggesting that carbon dioxide interacts strongly wit...

We present the mathematical model concepts for synthesis of carbon nanotubes by catalytic pyrolysis methane, based on analysis and approximation dependence process stages gas phase composition temperature. The was considered to consist three successive that include linear stage initial growth with a constant specific rate, retardation due catalyst active site deactivation, close linear, occurri...

Abstract The paper deals with the study of rhenium recovery by AMR anionite from model high-acidic sulfuric solution as well its desorption ammonia in column experiments. Total dynamic exchange capacity was calculated. Experimental data were processed using Thomas, Yoon-Nelson and Bed Depth Service Time models, basic parameters It found that total calculated Thomas fit closest to experimental v...

Nitrogen adsorption experiments have been extensively applied to shale pore structure research and evaluation. The can be quantitatively characterized in accordance with the nitrogen adsorption–desorption isotherm using various calculation models, whereas results obtained different models more effectively indicate characteristics of remains unclear. Further, there has not any unified process op...

The structural changes in electrodeposited palladium (Pd) films with desorption of co-deposited hydrogen were investigated, and the existing states Pd film analyzed. from an alkaline bath consisted (II) chloride, ammonium citric acid. Two pronounced peaks at around 500 K 880 observed thermal spectrum as-deposited film. For lower concentrations, lattice contraction proceeded concurrently room te...