Logical Solution

Logical Solution

Author: David Bradley

Thai researchers have developed optode membranes that incorporate tetramethoxyethylester calix[4]arene or valinomycin. These recognize sodium or potassium ions, respectively. Embedding the membranes with different types of chromoionophores in a plasticized poly(vinyl chloride) (PVC) matrix yields chemical logic gates that undergo competitive ion exchange where the chemical “input” would be protons or sodium/potassium ions. The presence of different ions changes the membrane’s optical response, which is the logic “output”. Different setups duplicate different logical functions, such as NAND, NOR, OR.

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