20861
In aqueous suspensions at pH 10 corrected Debye - H u ckel theory for surface complexation calculations predict that smaller silica colloids have increased negative surface charge density that originates from enhanced screening of deprotonated silanol groups ( = Si - O ( - ) ) by counterions in the condensed ion layer .
 Chemical: silica; Chemical: silanol; Chemical: = Si - O ( - )
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: silica; Chemical: silanol; Chemical: = Si - O ( - )