pH-Responsive Janus membrane with liquid gating property for crop protection and demulsification

Liu, Liming; Luan, Jiahao; Li, Shishun; Shao, Chen; Dong, Tianyun; Chen, Yong; You, Hui

doi:10.1016/j.cej.2024.149803

Cited by 5 publications

(1 citation statement)

References 45 publications

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“…The picture taken was of emulsion droplets with 10mmol/L SDS added at pH = 8. Due to the in uence of the addition of acidic substances, the negative charge of the stabilizer in the emulsion is reduced, resulting in the weakening of the electrostatic repulsion between the emulsion drops, the aggregation and fusion of the droplets, the size of the droplets becomes signi cantly larger, and the obvious crystallization on the surface of the particles occurs, and the emulsion structure is destroyed and the phenomenon of demulsi cation occurs [41,42]. The decrease of pH value of the emulsion will destroy the emulsi er or stabilizer in the emulsion dispersion, causing them to lose their original emulsifying or stabilizing function, resulting in emulsion breaking.…”

Section: Measurements Of Microscopicmentioning

confidence: 99%

Effect of surfactant compounding on emulsion stability and acid-base resistance using optical tweezers

Shang,

Jin,

Tian

et al. 2024

Preprint

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In industries, emulsions must adapt to various acid-base environments, making it crucial to study their properties and acid-base resistance. We prepared an oil-in-water (O/W) emulsion by adding oleic acid and polyether amine D-230 to water, with tetradecane as the oil phase. The stability of the emulsion was assessed by measuring the interaction forces between droplets using optical tweezers. Our results demonstrated that the amphoteric surfactant could significantly improve the stability of the emulsion. The results show that in the presence of amphoteric surfactant, the maximum repulsion force between droplets can reach 18.9 pN and ζ- potential is -65.16 mV, while in the absence of surfactant, the maximum repulsion is only 1.2 pN and ζ- potential is -25.54 mV. Further stabilization was achieved with the addition of 10 mmol/L anionic surfactant sodium dodecyl sulfate (SDS) or 1 mmol/L cationic surfactant cetyltrimethyl ammonium bromide (CTAB). With SDS, the maximum repulsive force was 40.8 pN and ζ- potential was 132.44 mV at the drop distance of 1.93 µm. With CTAB, the maximum repulsive force of 48.2 pN and ζ- potential of + 42.28 mV were measured at the drop distance of 3.12 µm, indicating that adding surfactants can effectively improve the stability of the emulsion. At the same pH value, the combined emulsion can measure the interaction force at a longer drop distance than the emulsion containing only amphoteric surfactants. When pH = 8, the interaction force of 1 mmol/L CTAB and 10 mmol/L SDS can be measured at the drop distance of 2.51 µm and 2.78 µm, respectively. Only the emulsion containing amphoteric surfactant can be measured at the drop distance of 2.26 µm, and the results show that it can enhance the acid-base resistance of the emulsion. These emulsions can be used to make good anticorrosive coatings and improve various properties of the original coatings.

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Section: Measurements Of Microscopicmentioning

confidence: 99%