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A series of polysaccharide‐based transparent composite films containing lanthanopolyoxometalates (LnPOMs) have been prepared by using a water‐soluble cationic chitosan derivative [HTCC = N‐(2‐hydroxypropyl)‐3‐trimethylammonium chitosan chloride] and pullulan (PUL). HTCC was more suitable than pure chitosan for this purpose due to its positive charge and solubility in water over a broad range of pH...
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