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We performed ion-beam irradiation of biodegradable polymer sheets to develop a super-thin film and self-assembly cellular sheets, which exfoliated spontaneously from the substrate in a water solution. Poly-l-lactic acid sheets were used as substrates. We performed He + and Kr + ion-beam irradiation at energies of 50, 100 and 150 keV with fluences between 1x10 14 and 1x10...
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