Influence of dehydration on the dielectric and structural properties of organically modified montmorillonite and halloysite nanotubes

Polanský, Radek; Kadlec, Petr; Kolská, Zdeňka; Švorčı́k, Václav

doi:10.1016/j.clay.2017.07.027

Cited by 34 publications

(16 citation statements)

References 36 publications

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“…The difference in water content for pristine and dried halloysite was 2.2 wt% measured by Karl Fischer coulometric titration method. This data correlate well with previously obtained value by TGA analysis [23]. The suspensions with 1, 2, 4, 8 wt% halloysite content have been prepared by dispersing nanoclay in polydimethylsiloxane oil during 48 hours by means of a magnetic stirrer and following treatment in an Elmasonic ultrasonic bath S 40 N, 340 W, 37 kc/s, 20 min before measurements.…”

Section: Methodssupporting

confidence: 89%

Halloysite nanotubes: Prospects in electrorheology

Kuznetsov¹,

Stolyarova²,

Белоусов³

et al. 2018

Express Polym. Lett.

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Electrorheological fluids based on polydimethylsiloxane filled with halloysite nanotubes were studied. The filler structure was characterized by TEM, SEM, and X-ray diffraction. When an electric field is applied to suspensions, their rheological behavior changes-the contribution of the elastic component becomes significant and samples behave like a solid body. The effect of the electric field and filler concentration on the electrorheological behavior was investigated. The influence of water content on the filler structure, as well as on electrorheological and electrophysical properties of suspensions, was considered. Electrorheological fluids filled by halloysite with small water content exhibit slightly higher rheological characteristics under an electric field than dried ones. This study shows the prospects of using halloysite nanotubes as a dispersed phase for electrorheological fluids.

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Section: Methodssupporting

confidence: 89%

Halloysite nanotubes: Prospects in electrorheology

Kuznetsov¹,

Stolyarova²,

Белоусов³

et al. 2018

Express Polym. Lett.

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“…Then, the temperature was decreased from 150

^{\circ}

C to 25

^{\circ}

C with same temperature step in the next phase called cooling. The frequency of the measuring voltage with amplitude of 1 V was gradually decreased in the chosen range for each selected temperature in both phases [30]. Several tens of pair of

ϵ^{'}

and

ϵ^{''}

values for different frequencies were obtained for each temperature (for heating and cooling) after the processing of measured data as a final result of dielectric analysis via BDS.…”

Section: Dielectric Properties Of Mgo Nanoparticles Via Broadband mentioning

confidence: 99%

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

et al. 2018

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Composite insulation materials are an inseparable part of numerous electrical devices because of synergy effect between their individual parts. One of the main aims of the presented study is an introduction of the dielectric properties of nanoscale magnesium oxide powder via Broadband Dielectric Spectroscopy (BDS). These unique results present the behavior of relative permittivity and loss factor in frequency and temperature range. Following the current trends in the application of inorganic nanofillers, this article is complemented by the study of dielectric properties (dielectric strength, volume resistivity, dissipation factor and relative permittivity) of epoxy-based composites depending on the filler amount (0, 0.5, 0.75, 1 and 1.25 weight percent). These parameters are the most important for the design and development of the insulation systems. The X-ray diffraction patterns are presented for pure resin and resin with optimal filler amount (1 wt %), which was estimated according to measurement results. Magnesium oxide nanoparticles were also treated by addition of silane coupling agent (γ-Glycidoxypropyltrimethoxysilane), in the case of optimal filler loading (1 wt %) as well. Besides previously mentioned parameters, the effects of surface functionalization have been observed by two unique measurement and evaluation techniques which have never been used for this evaluation, i.e., reduced resorption curves (RRCs) and voltage response method (VR). These methods (developed in our departments), extend the possibilities of measurement of composite dielectric responses related to DC voltage application, allow the facile comparability of different materials and could be used for dispersion level evaluation. This fact has been confirmed by X-ray diffraction analyses.

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“…Then, the nanodielectric systems become an object of interest of scientists and professionals from all over the world, who are discussing other options for modifications and potential applications [16]. The most frequent studied fillers ( Figure 2) are simple oxides (SiO 2 [17], Al 2 O 3 [18], ZnO [19], TiO 2 [20], MgO [21]), layered [22] or tubular [23] silicates, eventually also nonwoven nanoscale structures [24][25][26]. With the advent of last mentioned technologies, it is possible to characterize the composites as macro-, micro-and nano-.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Diagnostics of Nanostructured Micaless Microcomposite as a Prospective Insulation Material for Rotating Machines

et al. 2019

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This paper deals with the topic of composite insulation materials for rotating machines and it is primarily pointed to the synthesis of new three-component insulation system. In connection with this research, the basic components of the insulation system are selected and described by different diagnostic methods. The proposed insulation material is composed of epoxy resin based on bisphenol-A diglycidyl ether, magnesium oxide nanofiller (1 wt %) with its own surface treatment technology using epoxysilane coupling agent ( γ -glycidoxypropyltrimethoxysilane) and polyethylene naphthalate as a reinforcing component. Following the defined topic of the paper, the proposed three-component insulation system is confronted with commonly used insulating systems (PET reinforced and Glass reinforced mica composites) in order to verify the basic dielectric properties (dielectric strength, volume resistivity, dissipation factor) and other parameters determined from phenomenological voltage and current signals, respectively.

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Influence of dehydration on the dielectric and structural properties of organically modified montmorillonite and halloysite nanotubes

Cited by 34 publications

References 36 publications

Halloysite nanotubes: Prospects in electrorheology

Halloysite nanotubes: Prospects in electrorheology

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

Synthesis and Diagnostics of Nanostructured Micaless Microcomposite as a Prospective Insulation Material for Rotating Machines

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