Magnetic nanocomposites based on hydrogenated epoxy resin

González, María González; Martín-Fabiani, Ignacio; Baselga, Juan; Pozuelo, Javier

doi:10.1016/j.matchemphys.2011.11.077

Cited by 22 publications

(19 citation statements)

References 49 publications

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“…23 On the other hand, the addition of nanoparticles might decrease the T g value due to the decrease of the crosslinking density and/or interphase formation. [30][31][32] In order to verify these hypotheses, fracture surface of the epoxy-polyamide coatings containing Fe 3 O 4 or IBA-Fe 3 O 4 were observed by FE-SEM and presented in Fig. 4.…”

Section: Characterization Of the Epoxy-polyamide Coatingsmentioning

confidence: 96%

Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite

Trinh¹,

Nguyen²,

Thái³

et al. 2016

J Coat Technol Res

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Section: Characterization Of the Epoxy-polyamide Coatingsmentioning

confidence: 96%

Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite

Trinh¹,

Nguyen²,

Thái³

et al. 2016

J Coat Technol Res

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“…Magnetite nanoparticles (Mag), covered with oleic acid, were prepared and characterized in our laboratories in a previous work [29]. In a typical experiment, 14.5 g of FeCl 3 AE6H 2 O and 5.37 g of FeCl 2 AE4H 2 O were dissolved in 300 mL of deionised water in a round bottom flask placed in an ultrasonic bath with mechanical stirring at 70 80°C.…”

Section: Surface Modification Of Cnf With Magnetite Nanoparticlesmentioning

confidence: 99%

“…Composite preparation , and the mass fraction of oleic acid as measured by TGA [29], giving a value of 2.6 g cm 3 ; density of CNF was 1.97 g cm 3 as communicated by the supplier; density of CNF:Mag was calculated with the following expression. q CNT:Mag 2=½q…”

Section: 3mentioning

confidence: 99%

“…The size of the oleic acid capped magnetite nanoparticles was characterized by Transmission Electron Microscopy (TEM), X ray Diffraction (XRD) and magnetic measurements in a pre vious work [29] yielding values of: 9.4, 9.4 and 9.3 nm, respec tively. Superparamagnetic behaviour was confirmed by hysteresis loops at 2 and 300 K and a blocking temperature of 110 K was observed.…”

Section: Structural Characterizationmentioning

confidence: 99%

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Synergistic effect of magnetite nanoparticles and carbon nanofibres in electromagnetic absorbing composites

Crespo

Méndez

González

et al. 2014

Carbon

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Epoxy composites with different amounts of magnetite nanoparticles, carbon nanofibres (CNF) and magnetite decorated CNF were prepared and characterized. A simple method for the magnetite CNF decoration was developed by adsorbing preformed oleic acid capped magnetite nanoparticles over the CNF surface. A synergy between magnetite nano particles and CNF was found to have crucial effects in the electromagnetic shielding effi ciency of the prepared materials. This effect has been analysed by their electrical conductivity in terms of percolation theory and complex permittivity at high frequencies. Electromagnetic shielding mechanisms (reflection, absorption and transmission) were individually studied in the 1 18 GHz range. Results show that decoration of CNF with mag netite, notably increases permittivity and high frequency AC conductivity and enhances the electromagnetic shielding efficiency up to around 20 dB at high frequencies. It is pro posed that interfacial polarization adds an additional dissipation mechanism that may be responsible for the observed electromagnetic shielding enhancement. IntroductionAn electronic device is considered compatible with the envi ronment when its emissions do not affect other devices and is not affected itself by external emissions. Thus, any effort for minimizing interferences and protecting electronic de vices is of prime importance. Electromagnetic interferences (EMI) in many cases are minimized through the circuit design or using filters, while protection of devices is generally im proved with the use of metallic coatings [1 3], metal casings or polymer conductive composites [4 23]. The shielding mechanism in the two former cases is mainly related with radiation reflection processes while radiation absorption is the main mechanism in the latter. The choice of a material for shielding depends strongly on the final application: for example, low reflection losses and high absorption losses are required for military radar shielding materials whilst lightweight materials are a must for aerospace shielding applications; polymer matrix composites are thus promising materials that may fulfil a variety of requirements in all the above emerging fields. Three mechanisms for electromagnetic shielding are com monly accepted: reflection, absorption and multiple reflec tions [22]. In good conductors (i.e.: metals), the most important contribution is reflection, where losses are related with the ratio between conductivity and permeability (r/l). When considering composites, absorption, which depends on the product (rAEl) and on the thickness of the material, is * Corresponding author: Fax: +34 91 6249430. E mail address: jpozue@ing.uc3m.es (J. Pozuelo).1 the main mechanism. The third mechanism (multiple reflec tions) is related to the conductor skin thickness and for high frequencies, in the GHz range, is negligible [23]. For the pro tection of electronic devices towards external radiation, the most important mechanism should be reflection, so high con ductivity and low permeability is requir...

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“…To overcome this problem several routes have been proposed, such as surface modification of the nanoparticles, which is expected to improve nanoparticleepolymer matrix interactions either through weak Van der Waals interactions or strong chemical bonds [34,35]. Silica coated magnetic nanoparticles have also been proposed as an alternative to increase compatibility and to avoid further oxidation of the particles [36,37].…”

Section: Introductionmentioning

confidence: 99%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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This is a postprint version of the following published document:Crespo, M., González, M. y Pozuelo, J. (2014) h i g h l i g h t s g r a p h i c a l a b s t r a c tWe present a strategy that permits the nanoscale and micro scale con trol through a simple protocol. Cu Ni ferrites were prepared into the structure pores if commercial silica with a size control by annealing temperature.Composites with epoxy matrix wereThe reinforcements provided an increase in glass transition temperature and decomposition temperature of the composites.Multiscale composites with magnetic properties were prepared by incorporating Cu Ni nanoferrites filled silica microparticles in an epoxy matrix. The size of the nanoferrites was controlled both by the structure of the silica template and the annealing temperature (700 and 900 C) used during the syn thesis procedure. The ferrite:silica particles prepared at 700 C showed a narrow size distribution close to 8.3 nm with a superparamagnetic behaviour. A less symmetric size distribution was obtained when annealing was performed at 900 C, with diameters ranging from 15 to 80 nm. The reinforcement incorporation increased up to 7 C the glass transition temperature and 30 C the decomposition tem peratures of the composites. The proposed strategy permits the nanoscale control, by the trapping effect of the silica on the magnetic nanoparticles, as well as the control of the micro scale distribution through a simple protocol. These composites could have potential applicability as EMI shielding materials, owing to their magnetic nature, lightweight and enhanced thermal stability.

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Magnetic nanocomposites based on hydrogenated epoxy resin

Cited by 22 publications

References 49 publications

Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite

Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite

Synergistic effect of magnetite nanoparticles and carbon nanofibres in electromagnetic absorbing composites

Magnetic silica:epoxy composites with a nano- and micro-scale control

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