Can an Artificial Selectively Permeable Membrane Be Created?

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Creating an artificial selectively permeable membrane is feasible, with dialysis filters and mechanical filters serving as examples of such technology. The discussion emphasizes the importance of defining what the membrane should be selectively permeable to, as this determines the design and materials used. While it is possible to create filters that are selective based on charge, achieving a membrane that is exclusively permeable to specific ions like Na+ is considered unlikely. The concept of osmosis is highlighted as a key function of the desired membrane, and various material options for semi-permeable membranes are referenced for potential project ideas.
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Is it possible to create an artifical selectively permeable membrane? I need one for a science fair project idea I had.
 
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Selectively permeable *for what*?

Dialysis filters are selectively permeable. Any mechanical filter is selectively permeable. Put some charge on the filter and it's also selective for charged solutes.

Can we make a filter that is permeable only to Na+, for example? I don't think so.
 
Selectively permeable for either positve or negative molecules. I need the membrane to cause osmosis.
 

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