11856
Manipulating and controlling water - based aqueous solutions with the use of virtual walls is relatively simple compared to that of nonaqueous low - surface - tension liquids , which pose greater challenges to microfluidic devices .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None