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Firstly, 2 g of polyvinyl alcohol (PVA) powder was dissolved into 20 mL of DI water, and the mixture was heated to 90 ? C under exquisite stirring until the solution became clear. Subsequently, 10 mL aqueous Na 2 SO 4 (0.1 g mL ?1 ) was added dropwise into the above solution under constant stirring. |
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