2017
DOI: 10.1590/1980-5373-mr-2017-0649
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## Abstract:This work focuses on the systematic investigation of the two well-established methods of structural surface charge density determination on magnetic colloids, labeled as Single Potentiometric Method (SPM) and Potentiometric-Conductometric Method (PCM). To compare some important features of the methods we determined the structural surface charge density of magnetic colloids samples based on CoFe 2 O 4 @ɣ-Fe 2 O 3 core-shell nanoparticles with three different mean sizes using both strategies. Concerning quicknes… Show more

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##### Cited by 9 publications
(3 citation statements)
##### References 23 publications
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“…K eq + and K eq − respectively denote the surface stability constants, while the on the lined species belong to the solid phase. The pKa of and are respectively 1.44, and 4.66 [ 28 , 29 ].…”
Section: Resultsmentioning
confidence: 99%
“…K eq + and K eq − respectively denote the surface stability constants, while the on the lined species belong to the solid phase. The pKa of and are respectively 1.44, and 4.66 [ 28 , 29 ].…”
Section: Resultsmentioning
confidence: 99%
“…However, a charge density as large as has been reported in magnetic nanoparticles suspended in polar solvents. If such large charge densities can be realised in particles of radius , the parameter for such particles is (Brown et al 2013; Campos et al 2017). The parameter is much smaller, about for particles with diameter , charge density 1 C m and , where is expressed in .…”
Section: Discussionmentioning
confidence: 99%
“…Typical potentiometric-conductometric titration curves of N-CDs sample are presented in Figure 4, where the equivalence points EP 1 and EP 2 were determined by using direction lines applied to the conductometric curve [37][38][39]. These equivalence points delimit three distinct regions whose meaning can be described as follows.…”
Section: Colloidal Properties Of N-cds Aqueous Dispersionsmentioning
confidence: 99%