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Schemes of pH-responsive perpetual-motion devices of the second kind:
http://upload.wikimedia.org/wikipedi..._mechanism.jpg http://www.gsjournal.net/old/valev/val3.gif http://www.ncbi.nlm.nih.gov/pmc/arti...00645-0017.pdf A. KATCHALSKY, POLYELECTROLYTES AND THEIR BIOLOGICAL INTERACTIONS, p. 15, Figure 4: "Polyacid gel in sodium hydroxide solution: expanded. Polyacid gel in acid solution: contracted; weight is lifted." Pentcho Valev |
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