Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Range of variables and their levels used in CCD
| Independent variables | Unit | Code level | ||||
|---|---|---|---|---|---|---|
| −1.41 | −1 | 0 | 1 | 1.41 | ||
| Oil/mixed-surfactants ratio | w/w | 1/9 | 1/8 | 1/6 | 1/4 | 1/3 |
| Proportion of aqueous phase |
% | 50 | 55 | 60 | 65 | 70 |
Note: Optimization experiment was constructed by 2 factors and 5 levels.
Abbreviation: CCD, central composite design.
