17042
Grazing incidence X - ray diffraction ( GID ) measurements indicate that the mesophase geometry of the interfacial films could be controlled to give lamellar , 2D hexagonal , and several cubic phases ( Pn3 m , Fm3 m , and Im3 m ) by varying the polyelectrolyte molecular weight , polyelectrolyte chemical nature , or the cationic : anionic surfactant molar ratio .
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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:
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