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 10 publications
(33 citation statements)
##### References 23 publications
(33 reference statements)
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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%
“…Figure 6 shows the zeta potential as a function of pH for the PACo–Lys and PACo samples ( Figure 6 a), and the PACoM and PACoM–Lys samples ( Figure 6 b). The pH dependence of the zeta potential of the precursor nanoparticles has been already explored [ 34 , 35 ], and it is related to the number of ≡FeOH 2 + and ≡FeO − surface sites, which are predominant in acidic and alkaline mediums, respectively. In the case of the nanoadsorbents, the charge regulation may be explained based on the balance of the deprotonation of carboxyl groups (pKa~2.2) and ammonium groups (pKa~9.1 and ~10.8) of the L-lysine layer.…”
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%