Reversible stability of colloids switched by CO2 based on polyhexamethylene guanidine

The stability of a colloid, including emulsion and polymer latex, can be destroyed irreversibly by the addition of salt. Using the CO2 stimulus, amines can be converted into organic ammonium salts reversibly, which can access the switching of colloids. Polyhexamethylene guanidine (PHMG), was chosen as a switchable amine. The conductivity of PHMG aqueous solution switched by adding and removing CO2. Surface tension measurements verified that, under CO2, the critical micelle concentration of sodium dodecyl benzene sulfonate (SDBS) decreased from 1.0 x 10(-3) to 5.0 x 10(-4) M with the addition of PHMG. The crude oil emulsion containing SDBS and PHMG was destroyed and restored reversibly by the treatment with CO2 and N-2. The polystyrene latex also occurred an obvious stratification after sparging with CO2 and returned a homogeneous phase upon bubbling N-2. This study is intended to pave the way for colloids which has reversible stability in response to CO2 stimulation.

Automated summary

The stability of colloids can be irreversibly destroyed by the addition of salt, but can be reversibly switched by CO2 stimulus. This study provides a pathway for developing colloids with reversible stability in response to CO2 stimulation.