Theory and Observation of Displacement Phenomena in Coadsorbed Films
نویسندگان
چکیده
Displacement refers to a surprising phenomenon observed in a number of adsorption systems. At low temperatures, some relatively inert gases, such as krypton (Kr) or methane (CH4), are found to displace molecules from preadsorbed monolayer films of a more condensable species, such as carbon tetrachloride (CCl4), from a graphite substrate. We present a simple thermodynamic model to explain displacement and make a prediction applicable to both first-order and continuous displacement processes. We also present measurements on CH4 CCl4 and Kr CCl4 coadsorbed films from 77–112 K that verify our prediction and yield the CCl4 film spreading pressure.
منابع مشابه
Coadsorption phase diagram for CH4/CCl4 on graphite
We present an extensive thermodynamic study of methane coadsorbed on graphite precoated with a saturated monolayer of carbon tetrachloride. A combination of heat capacity and volumetric equation of state data permit construction of the multilayer coadsorption phase diagram between 70 and 115 K. Displacement of the preadsorbed CCl4 by CH4 occurs by a continuous process across the temperature ran...
متن کاملPhysical and mechanical features investigation of protein-based biodegradable films obtained from trout fish waste
Biological packaging material based on obtained proteins from fish waste, are biopolymers that have the capability of biodegradable film formation. Thus, purpose of this research is to study and investigate some of films’ physical features made from trout fish Myofibril protein. The film forming solution containing 1.5%, 2% and 2.5%(w/v)Myofibril protein isolate of 100ml solution and glycerol a...
متن کاملPhysical and mechanical features investigation of protein-based biodegradable films obtained from trout fish waste
Biological packaging material based on obtained proteins from fish waste, are biopolymers that have the capability of biodegradable film formation. Thus, purpose of this research is to study and investigate some of films’ physical features made from trout fish Myofibril protein. The film forming solution containing 1.5%, 2% and 2.5%(w/v) Myofibril protein isolate of 100ml solution and glycerol ...
متن کاملPhysical and mechanical features investigation of protein-based biodegradable films obtained from trout fish waste
Biological packaging material based on obtained proteins from fish waste, are biopolymers that have the capability of biodegradable film formation. Thus, purpose of this research is to study and investigate some of films’ physical features made from trout fish Myofibril protein. The film forming solution containing 1.5%, 2% and 2.5% (w/v) Myofibril protein isolate of 100ml solution and glycerol...
متن کاملExperimental and Numerical Pore Scale Study of Residual Gas Saturation in Water/Gas Imbibition Phenomena
Residual gas saturation is one of the most important parameter in determining recovery factor of water-drive gas reservoir. Visual observation of processes occurring at the pore level in micromodels can give an insight to fluid displacements at the larger scale and also help the interpretation of production performance at reservoir scale. In this study experimental tests in a glass micromod...
متن کامل