2522
However , the effect is limited to the nanocrystals having sufficiently permeable surfactant layer , where the small solvent molecules ( e . g . , water ) can access the surface and dynamically modify the ligand field on the surface .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None