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A gas separator, a method for producing the gas separator, and a method for separating gases based on a property of inelasticity of the gases. The inventive gas separator is a permeable porous material for separating a mixture of gases by selectable pore size exclusion, comprising pores formed with

A gas separator, a method for producing the gas separator, and a method for separating gases based on a property of inelasticity of the gases. The inventive gas separator is a permeable porous material for separating a mixture of gases by selectable pore size exclusion, comprising pores formed with at least one nanostructured compound. In other words, the inventive porous material can be used to separate a mixture of gases based upon the different working diameter of each of the gases. By selecting specific nanostructured compounds, the porous material can be tailored to contain pores of a predetermined size which allow gases having a working diameter smaller than the size of the pores to pass through the material while preventing the passage of gases having a working diameter greater than the size of the pores.

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1. A permeable porous material for separating a mixture of gases by selectable pore size exclusion, comprising pores formed with at least one nanostructured compound, wherein the at least one nanostructured compound is optionally substituted and is selected from the group consisting of a polyhedral

1. A permeable porous material for separating a mixture of gases by selectable pore size exclusion, comprising pores formed with at least one nanostructured compound, wherein the at least one nanostructured compound is optionally substituted and is selected from the group consisting of a polyhedral oligomeric silsequioxane (POSS), zeolite, cyclomacroether, porphyrin, foldamer, cyclodextrin and mixtures thereof, wherein the POSS has a molecular formula of:SinO3/2nRn wherein n is 4-36, 48 or 60, and R is a reactive substituent.