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Diffusion experiments for the neutral dye , ferrocenecarboxaldehyde , through the PMAA - modified membranes showed a 13 - fold increase in flux upon addition of an acid resulting from the protonated polymer collapsing onto the nanopore surface leading to larger pore size .
 Chemical: ferrocenecarboxaldehyde; Chemical: PMAA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ferrocenecarboxaldehyde; Chemical: PMAA