Cloud point in non-ionic surfactants probed by electrical impedance spectroscopy

Quimica nova

Lima, Sandro Vagner de¹  Oliveira, Helinando Pequeno de¹ 

[1] Universidade Federal do Vale do São Francisco, Juazeiro, Brasil

关键词: electrical impedance spectroscopy;    cloud point;    non-ionic surfactants.;   

DOI  :  10.1590/S0100-40422010000900020

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this paper,we analyze the use of electrical impedance spectroscopy applied to determinationof cloud point. The slope of admittance measured at 100 kHz is reduced to temperatureabove the critical value which characterizes the phase transition, in a strongindication that this process is activated during the clouding. Additionallyto this study we explored the influence of parameters such as additives andtemperature on the performance of phase separation of residues (silver nanoparticles)by cloud point extraction. The interaction with salt maximizes the separationof chemical residues in a progressively reduced temperature.

【 授权许可】

CC BY