Wide-frequency-range dielectric response of polystyrene latex dispersions

Roldán-Toro, R.; Solier, J. D.

doi:10.1016/j.jcis.2004.02.068

Cited by 25 publications

(21 citation statements)

References 46 publications

(84 reference statements)

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“…These asymptotic forms for low frequencies agree with those in eqn (29) and (30) The expression (9) for the loss-permittivity also agrees with that found in eqn (48) In the analysis of experimental dielectric data on suspensions of charged colloids, the dimensionless frequency L is not always small, so that the full expressions in eqn (6) must be used. These expressions have not been reported explicitly in literature before.…”

Section: Electrode Polarizationsupporting

confidence: 79%

Dielectric spectroscopy of ionic microgel suspensions

et al. 2016

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The determination of the net charge and size of microgel particles as a function of their concentration, as well as the degree of association of ions to the microgel backbone, has been pursued in earlier studies mainly by scattering and rheology. These methods suffer from contributions due to inter-particle interactions that interfere with the characterization of single-particle properties. Here we introduce dielectric spectroscopy as an alternative experimental method to characterize microgel systems. The advantage of dielectric spectroscopy over other experimental methods is that the polarization due to mobile charges within a microgel particle is only weakly affected by inter-particle interactions. Apart from electrode polarization effects, experimental spectra on PNIPAM-co-AA [poly(N-isopropylacrylamide-co-acrylic acid)] ionic microgel particles suspended in de-ionized water exhibit three well-separated relaxation modes, which are due to the polarization of the mobile charges within the microgel particles, the diffuse double layer around the particles, and the polymer backbone. Expressions for the full frequency dependence of the electrode-polarization contribution to the measured dielectric response are derived, and a theory is proposed for the polarization resulting from the mobile charges within the microgel. Relaxation of the diffuse double layer is modeled within the realm of a cell model. The net charge and the size of the microgel particles are found to be strongly varying with concentration. A very small value of the diffusion coefficient of ions within the microgel is found, due to a large degree of chemical association of protons to the polymer backbone.

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Section: Electrode Polarizationsupporting

confidence: 79%

Dielectric spectroscopy of ionic microgel suspensions

et al. 2016

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“…Conversely, the interfacial polarization of charged vesicles occurs well below the available frequency window. Presumably, a Maxwell-Wagner low frequency relaxation process occurs [43]. The dielectric increment with respect to the high frequency limit, ε, is reported in Fig.…”

Section: Protein Bindingmentioning

confidence: 95%

Lysozyme binding onto cat-anionic vesicles

Bonincontro¹,

Spigone²,

Peña³

et al. 2006

Journal of Colloid and Interface Science

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“…A different approach is to model the EP contribution to the sample impedance and consequently remove it. However, while this may be done in theory, in practice, every new polyelectrolyte solution presents itself as a system where the EP effect can have a different influence, and our incomplete understanding of this phenomenon reappears [17]. Even for a simple capacitance chamber there remain two experimental approaches for reduction of EP.…”

Section: A Capacitance Chamber and The Electrode Polarizationmentioning

confidence: 99%

Structure and dynamics of hyaluronic acid semidilute solutions: A dielectric spectroscopy study

et al. 2010

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Dielectric spectroscopy is used to investigate fundamental length scales describing the structure of hyaluronic acid sodium salt (Na-HA) semidilute aqueous solutions. In salt-free regime, the length scale of the relaxation mode detected in MHz range scales with HA concentration as c(HA)(-0.5) and corresponds to the de Gennes-Pfeuty-Dobrynin correlation length of polyelectrolytes in semidilute solution. The same scaling was observed for the case of long, genomic DNA. Conversely, the length scale of the mode detected in kilohertz range also varies with HA concentration as c(HA)(-0.5) which differs from the case of DNA (c(DNA)(-0.25)). The observed behavior suggests that the relaxation in the kilohertz range reveals the de Gennes-Dobrynin renormalized Debye screening length, and not the average size of the chain, as the pertinent length scale. Similarly, with increasing added salt the electrostatic contribution to the HA persistence length is observed to scale as the Debye length, contrary to scaling pertinent to the Odijk-Skolnick-Fixman electrostatic persistence length observed in the case of DNA. We argue that the observed features of the kilohertz range relaxation are due to much weaker electrostatic interactions that lead to the absence of Manning condensation as well as a rather high flexibility of HA as compared to DNA.

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Wide-frequency-range dielectric response of polystyrene latex dispersions

Cited by 25 publications

References 46 publications

Dielectric spectroscopy of ionic microgel suspensions

Dielectric spectroscopy of ionic microgel suspensions

Lysozyme binding onto cat-anionic vesicles

Structure and dynamics of hyaluronic acid semidilute solutions: A dielectric spectroscopy study

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