2198
The growth of sphere - like trimanganese tetraoxide ( Mn ( 3 ) O ( 4 ) ) nanoparticles on silk fiber was achieved by sequential dipping in an alternating bath of potassium hydroxide and manganese ( II ) nitrate under ultrasound irradiation .
 Chemical: trimanganese tetraoxide; Chemical: Mn ( 3 ) O ( 4 ); Chemical: potassium hydroxide; Chemical: manganese ( II ) nitrate
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: trimanganese tetraoxide; Chemical: Mn ( 3 ) O ( 4 ); Chemical: potassium hydroxide; Chemical: manganese ( II ) nitrate