9128
Confocal microscopy and high speed video imaging show that the octylamine - coated , rod - shaped NFC nanoparticles residing at the air - liquid interface prevent the air bubbles from collapsing or coalescing .
 octylamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 octylamine