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The aim of the current study was to investigate the self - assemblies of the nonionic surfactant polyglycerol ester ( PGE ) in bulk solutions , at the interface and within foams , using a combined approach of small - angle neutron scattering , neutron reflectivity , and electron microscopy .
 Chemical: polyglycerol ester; Chemical: PGE
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyglycerol ester; Chemical: PGE