On the use of electrokinetics for unraveling charging and structure of soft planar polymer films

Zimmermann, Ralf; Dukhin, S. S.; Werner, Carsten; Duval, Jérôme F. L.

doi:10.1016/j.cocis.2013.02.001

Cited by 54 publications

(101 citation statements)

References 47 publications

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“…More generally, it paves a way for refined evaluation of soft nanoparticles electrostatic features from detailed understanding of the roles played by charge density distribution in and thickness of polymeric coatings in determining particle mobility, similarly to analyses of supported soft thin films by streaming current/streaming potential electrokinetic methods. 2 Langmuir Article ■ ASSOCIATED CONTENT…”

Section: Discussionmentioning

confidence: 99%

Remarkable Electrokinetic Features of Charge-Stratified Soft Nanoparticles: Mobility Reversal in Monovalent Aqueous Electrolyte

et al. 2015

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The electrokinetic behavior of G6.5 carboxylate-terminated poly(amidoamine) (PAMAM) starburst dendrimers (8 ± 1 nm diameter) is investigated over a broad range of pH values (3-9) and NaNO3 concentrations (c(∞ )= 2-200 mM). The dependence of nanodendrimer electrophoretic mobility μ on pH and c(∞) is marked by an unconventional decrease of the point of zero mobility (PZM) from 5.4 to 5.5 to 3.8 upon increase in salt concentration, with PZM defined as the pH value at which a reversal of the mobility sign is reached. The existence of a common intersection point is further evidenced for series of mobility versus pH curves measured at different NaNO3 concentrations. Using soft particle electrokinetic theory, this remarkable behavior is shown to originate from the zwitterionic functionality of the PAMAM-COOH particles. The dependence of PZM on c(∞) results from the coupling between electroosmotic flow and dendrimeric interphase defined by a nonuniform distribution of amine and carboxylic functional groups. In turn, μ reflects the sign and distribution of particle charges located within an electrokinetically active region, the dimension of which is determined by the Debye length, varied here in the range 0.7-6.8 nm. In agreement with theory, the electrokinetics of smaller G4.5 PAMAM-COOH nanoparticles (5 ± 0.5 nm diameter) further confirms that the PZM is shifted to higher pH with decreasing dendrimer size. Depending on pH, a mobility extremum is obtained under conditions where the Debye length and the particle radius are comparable. This results from changes in particle structure compactness following salt- and pH-mediated modulations of intraparticle Coulombic interactions. The findings solidly evidence the possible occurrence of particle mobility reversal in monovalent salt solution suggested by recent molecular dynamic simulations and anticipated from earlier mean-field electrokinetic theory.

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Section: Discussionmentioning

confidence: 99%

Remarkable Electrokinetic Features of Charge-Stratified Soft Nanoparticles: Mobility Reversal in Monovalent Aqueous Electrolyte

et al. 2015

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“…charged polymers [33] and (bio)polymers at bacterial surfaces [34]. This discrepancy stems from the possible change of interfacial structure via swelling processes at sufficiently low solution ionic strength.…”

Section: Electrostatic Properties Of the Phagesmentioning

confidence: 97%

Isoelectric point is an inadequate descriptor of MS2, Phi X 174 and PRD1 phages adhesion on abiotic surfaces

Dika

Duval

Francius

et al. 2015

Journal of Colloid and Interface Science

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“…Polyelectrolyte-coated particles are called soft particles [8,10,[13][14][15]. Soft particles serve as a model for biocolloids such as cells.…”

Section: Soft Particlesmentioning

confidence: 99%

“…In this chapter we start with the electrical double layer around a charge particle in an electrolyte solution (Figure 1.1). We treat both hard particles and soft particles, i.e., polyelectrolyte-coated particles [8,10,[13][14][15] (Figure 1.2). We discuss the electrostatic interaction between two approaching particles due to the overlapping of the electrical double layers around them.…”

Section: Introductionmentioning

confidence: 99%

Interaction of colloidal particles

Ohshima

2014

Colloid and Interface Science in Pharmaceutical Research and Development

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On the use of electrokinetics for unraveling charging and structure of soft planar polymer films

Cited by 54 publications

References 47 publications

Remarkable Electrokinetic Features of Charge-Stratified Soft Nanoparticles: Mobility Reversal in Monovalent Aqueous Electrolyte

Remarkable Electrokinetic Features of Charge-Stratified Soft Nanoparticles: Mobility Reversal in Monovalent Aqueous Electrolyte

Isoelectric point is an inadequate descriptor of MS2, Phi X 174 and PRD1 phages adhesion on abiotic surfaces

Interaction of colloidal particles

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