21685
In a series of papers we have reported on Langmuir monolayers with CF3 terminals of the polar heads , which show a negative surface dipole potential Delta V ( Petrov , J . G . ; Andreeva , T . D . ; Kurt , D . K . ; M o hwald , H . J . Phys . Chem . B 2005 , 109 , 14102 ) .
 Chemical: CF3
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: CF3