The dielectric increments of aqueous polyelectrolyte solutions: a scaling approach

Mandel, M.

doi:10.1016/s0301-4622(00)00118-6

Cited by 22 publications

(33 citation statements)

References 28 publications

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“…This change is believed to be caused by the reduced number of condensed charges on the polymer (Table 1) as the total charge is decreased due to the introduction of hydrophobic side-chains. In the aforementioned study of poly(styrene-sulfonate) [14] dispersion magnitudes of approximately 100 was observed for polymers of 177 kDa in solutions of 1.8 g/L. This magnitude agrees well with the values of De found in this study.…”

Section: The Effect Of the Coagulation Process On The Dispersion Magnsupporting

confidence: 91%

“…In a study of the dielectric dispersion of solutions of sulfonated polystyrene polymer (M = 177 kDa), Mandel found s to be in the range 10-20 ls depending on the polymer concentration [14]. These findings agree well with the relaxation times observed in this study.…”

Section: The Effect Of the Coagulation Process On Relaxation Timesupporting

confidence: 89%

“…Dielectric spectroscopy (DS) has previously been used for the characterisation of colloidal particles [6][7][8][9][10][11] and dissolved polymers [12][13][14] in terms of size and charge, and has the capability of measuring at high solid concentrations [11]. Recently, the use of DS to monitor the flocculation of polystyrene particles [15,16] was investigated.…”

Section: Introductionmentioning

confidence: 99%

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The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

Christensen

Keiding

2009

Journal of Colloid and Interface Science

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Section: The Effect Of the Coagulation Process On The Dispersion Magnsupporting

confidence: 91%

Section: The Effect Of the Coagulation Process On Relaxation Timesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

Christensen

Keiding

2009

Journal of Colloid and Interface Science

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“…Lots of works have discussed the mechanisms of these two dielectric relaxations: concretely, the low-frequency relaxation which occurs in the order of around kHz is commonly assigned to the fluctuation of the condensed counter-ions along the whole polyion axis. 18,19 However, the mechanism of high-frequency relaxation in the order of around MHz has not been understood fully until now. Therefore, various models have been used to interpret this dielectric behavior.…”

Section: Introductionmentioning

confidence: 99%

Dielectric analysis of poly(diallyldimethylammonium chloride) aqueous solution coupled with scaling approach

Lian

Zhao

Yang

2010

Phys. Chem. Chem. Phys.

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Dielectric measurements were carried out on aqueous solution of poly(diallyldimethylammonium chloride) (PDADMAC) with different concentrations at room temperature. Additionally, for selected solutions the temperature dependence of dielectric relaxation spectroscopy (DRS) was examined in the range of 5-70 degrees C. The dielectric relaxation in the order of around MHz was observed, and the dielectric parameters were determined from the dielectric spectra by fitting data with the Cole-Cole equation. The dielectric parameters showed strong dependences on concentration and on temperature, respectively, and these dependences are analyzed by the scaling theory. From the analysis of concentration dependence of dielectric parameters, the dielectric relaxation is assigned to the localized fluctuation of uncondensed counter-ions over the distance between chains in dilute solution and correlation length in semi-dilute solution, respectively, and the solvent quality parameter for the uncharged polyelectrolyte chain is evaluated. By the analysis of temperature dependence of dielectric parameters, we find that: the physical meanings of the typical lengths of uncondensed counter-ions are not influenced by temperature; in semi-dilute solution, the highly extended length of the chain (correlation length) increases and the end-to-end distance of the chain decreases with increasing solution temperature; in the change process of dielectric relaxation of PDADMAC solution induced by the increase of temperature, the increment of ionic diffusion coefficient and decrement of permittivity of the solvent medium are the major factors. The enthalpy and entropy of activation of the dielectric relaxation are experimentally determined by the dependence of relaxation time on temperature, individually.

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“…On moving towards the higher value of frequency, " 00 shows constant value. This characteristic behavior of " 00 with frequency and temperature, corresponds to moment of charge carriers 41,[47][48][49][50] and dielectric relaxation of material.…”

Section: Imaginary Part Of Complex Permittivitymentioning

confidence: 99%

Alteration of structural, optical and electrical properties of CdSe incorporated polyvinyl pyrrolidone nanocomposite for memory devices

Tyagi

Devi

2018

J. Adv. Dielect.

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The important enhancement in the structural, dielectric and optical properties of pure polymer and CdSe incorporated polyvinyl pyrrolidone has been reported in this paper. The surface morphology of CdSe/PVP nanocomposite film is studied by using scanning electron microscopy (SEM). The chemical composition of different elements has been reported using energy dispersive X-ray (EDX) spectrum. The structure of polymer nanocomposite is determined with the help of X-ray diffraction (XRD) spectrum and is observed to be hexagonal. Particle size, intercrystalline separation, interplanner spacing, lattice parameters, strain and dislocation factors are calculated using XRD results. Fourier transform infrared spectroscopy (FTIR) and Photoluminescence (PL) analysis have been studied in order to check the possible interaction between CdSe quantum dots and polyvinyl pyrrolidone (PVP) matrix. The ac conductivity of CdSe/PVP nanocomposite is found to be higher as compared to pure polymers. The highest value of conductivity observed at 60203 Hz and at 523 K is found to be [Formula: see text][Formula: see text]Sm[Formula: see text]. Comparative study of dielectric constant, dielectric losses, dissipation factor, electric modulus and impedance has been performed. The semi-circles in impedance measurement for both materials show the bulk electrical properties that result in single relaxation process in CdSe/PVP nanocomposite.

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The dielectric increments of aqueous polyelectrolyte solutions: a scaling approach

Cited by 22 publications

References 28 publications

The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

Dielectric analysis of poly(diallyldimethylammonium chloride) aqueous solution coupled with scaling approach

Alteration of structural, optical and electrical properties of CdSe incorporated polyvinyl pyrrolidone nanocomposite for memory devices

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