Specific features of the polarization of thin water films in the field of the active surface of a mica crystal

Borisov, Vladislav; Karnakov, V. A.; Ezhova, Ya. V.; Rubtsova, O. B.; Shcherbachenko, L. A.

doi:10.1134/s1063783408060048

Cited by 10 publications

(6 citation statements)

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“…The charge 2 Q released at temperatures in the interval 40-80°С is maximal for samples with the least water component concentration, which testifies to a more efficient manifestation of the bound water regions. For the charge carriers showing the structural properties of the solid phase and manifested at high temperatures in the interval 80-140°С, the increase in the parameter 3 Q from 1.1·10 -4 to 2.0·10 -4 C, attributed to the increased intensity of ionic transport in the examined condensed system, was typical. Based on the results of our investigations, we can conclude the following.…”

mentioning

confidence: 87%

“…Nowadays investigations of the physical properties and structural peculiarities of heterogeneous matrix-type systems produced by doping of continuous media with electrically active particles having very developed surface are of significant interest [1][2][3][4][5][6][7][8][9][10]. Mechanically activated natural micas characterized by high electric activity are widely used as dispersed fillers and modifiers for polymeric coatings and modern materials [4,5,8].…”

mentioning

confidence: 99%

“…Charged defects on the surface of low-dimensional mica particles result in the effective adsorption of polar water molecules by these particles. Due to high electric activity of the mica particles, significant part of water adsorbed by them is in the structured state characterized by the properties different from the bulk water properties [1][2][3][4]. Investigation of the structural peculiarities and dielectric response of the adsorbed water component will allow one to expand the knowledge of the mechanism of electric contact interaction in the examined condensed systems.…”

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confidence: 99%

“…As is well known, the structured water at temperatures in the interval 60-65°С is transformed into the bulk state due to thermal disordering of molecules. This is accompanied by an increase in the dielectric permittivity of the liquid phase of the low-dimensional micas [3][4][5]. The increase of the maximum amplitude at 64°С (Fig.…”

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confidence: 99%

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Electret effect in heterogeneous systems comprising low-dimensional particles with electrically active surface

et al. 2010

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Experimental and theoretical investigations of the electret effect in low-dimensional micas with different degrees of dispersion and adsorption are carried out at temperatures in the range 20-140°С. The results obtained allow the electric activity of the mica particles comprised in these systems to be determined and the efficiency of application of low-dimensional micas for fillers of composite materials to be estimated.

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Electret effect in heterogeneous systems comprising low-dimensional particles with electrically active surface

et al. 2010

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“…In such cases one can suggest an analogy with the version of concentrated solutions of salts and crystallohydrates or ion melts with water added. Here, ε = 30-40 in the solution bulk or ε = 5 on the crystal surface (or at the solution-crystal inter face) [35][36][37][38][39]. The thermodynamic activity of water, which correlates with the ε value, should also decrease significantly.…”

Section: Model Of the Joint Influence Of Cations And Anions On The Grmentioning

confidence: 99%

The role of hydration and complexing in the mechanism of impurity influence on crystal growth

2012

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The influence of impurities of chlorides and nitrates of divalent Ca 2+ and Ba 2+ cations on the kinetic growth of potassium dihydrophosphate KH 2 PO 4 crystals at a saturation temperature of 323 K and rel ative supersaturation of 0.03 has been investigated experimentally. It is established that the impurity acts dif ferently, depending on the face index, the impurity concentration, cation hydration, and the stability of the complexes formed in the solution by impurity salt ions. A model is proposed to explain the different influence of impurity ions on the growth of crystal faces. This influence is determined by the different hydration of cat ions and enhanced association of cations and anions of impurity salts in the surface layer with a lower dielec tric constant.

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Self Assembling and Coordination of Water Nano-Layers On Polymer Coated Long Period Gratings: Toward New Perspectives for Cation Detection

et al. 2011

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In this work, polymeric coated Long Period Gratings (LPGs) working in transition mode have\ud been used to monitor the coordination and self assembling of water nano-layers (typical thicknesses\ud range in few tens of nanometers) providing new scenarios in chemical sensing applications.\ud In particular, nano-scale layers (∼320nm) of semicrystalline syndiotactic and amorphous atactic\ud polystyrene (sPS and aPS), have been deposited by dip-coating onto LPGs to tune the devices at the\ud transition point. Experimental results demonstrate the polymers capability to orient water molecules\ud in proximity of their surfaces. The sPS and aPS interactions with water have been continuously\ud monitored and then compared demonstrating the higher capability of the crystalline phase of sPS\ud to orient water nano-layers. Moreover, the high sensitivity of the coated LPGs was used to monitor\ud the effect of disorder induced on the interfacial water molecular arrangement by different cations\ud (sodium, Na+, potassium, K+, and calcium, Ca2+, ions) depending on their size and electrical\ud charge. Experimental results show for the first time that, thanks to the water-polymer interaction,\ud sPS coated LPGs could be successfully employed as high sensitivity cation sensors. In fact, the monitoring\ud of the disorder induced by cations on the coordinated water layer leads to high sensitivities,\ud in terms of detected RI change for unitary variation of concentration (∼7.80 · 10−4RIU · mM−1\ud for Na+ ions, ∼9.00 · 10−4RIU · mM−1 for K+ ions, and ∼1.07 · 10−3RIU · mM−1 for Ca2+\ud ions)

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Specific features of the polarization of thin water films in the field of the active surface of a mica crystal

Cited by 10 publications

References 2 publications

Electret effect in heterogeneous systems comprising low-dimensional particles with electrically active surface

Electret effect in heterogeneous systems comprising low-dimensional particles with electrically active surface

The role of hydration and complexing in the mechanism of impurity influence on crystal growth

Self Assembling and Coordination of Water Nano-Layers On Polymer Coated Long Period Gratings: Toward New Perspectives for Cation Detection

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