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00925njm 22002777a 4500 dc Altamash, Tausif . author Nasser, Mustafa S. author Elhamarnah, Yousef author Magzou, Musaab . author Ullah, Ruh . author Qiblawey, Hazim . author Aparicio Martínez, Santiago author Atilhan, Mert author 2018-04 Natural deep eutectic solvent (NADES) produced herein this work by mixing betaine and alanine with lactic acid and malic acid with 1:1 M mixing ratios. Thermophysical properties including water content, thermal stability, density and gas solubility of CO2 and N2 were experimented at different isotherms for wide pressures range up to 50 bars. Moreover, detailed rheological experiments were conducted on the studied materials to obtain viscosity and deduce the dynamic flow behavior. A pressure driven physisorption mechanism was observed for the studied systems. Betaine based NADES materials showed superior carbon dioxide and nitrogen solubility when they are mixed with lactic acid. On the other hand, the rheological experimental results show shear-thinning effect in which the η is decreasing with shear rate at all temperatures. Low viscosity profiles NADES assure the less mass transfer resistance for lactic acid based NADES systems and it also confirmed that the high CO2 and N2 solubility for lactic acid based NADES samples. 0167-7322 http://hdl.handle.net/10259/4781 10.1016/j.molliq.2018.02.049 Deep eutectic solvents Natural products Gas solubility Rheology Gas solubility and rheological behavior study of betaine and alanine based natural deep eutectic solvents (NADES)