Thermal Conductivity of Nanoparticles Filled Polymers

Ebadi‐Dehaghani, Hassan; Nazempour, M.

doi:10.5772/33842

Cited by 54 publications

(48 citation statements)

References 88 publications

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“…The heat conductivity of YIG is around 5-6 W K −1 m −1 at room temperature 23,24 . In contrast, the thermal conductivity of the black polymer-nanoparticle compound is approximately one order of magnitude smaller 22 . Measurements of magnonic crystal characteristics at different YIG temperatures (uniform temperature profile) showed that there are no magnetostriction effects arising due to the difference in the thermal expansion coefficients of the absorber and the YIG layer.…”

mentioning

confidence: 94%

“…To increase the efficiency of the heating we use a black absorber coated on top of the YIG. Moreover, this absorber increases the contrast of the thermal landscape in YIG owing to its approximately one order of magnitude smaller thermal conductivity 22 compared to YIG (refs 23,24). Thus, the heat pattern inside the spin-wave waveguide is created mainly through thermal diffusion at the YIG/absorber interface.…”

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confidence: 99%

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Optically reconfigurable magnetic materials

et al. 2015

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Structuring of materials is the most general approach for controlling waves in solids. As spin waves-eigen-excitations of the electrons' spin system-are free from Joule heating, they are of interest for a range of applications, such as processing 1-5 , filtering 6-8 and short-time data storage 9 . Whereas all these applications rely on predefined constant structures, a dynamic variation of the structures would provide additional, novel applications. Here, we present an approach for producing fully tunable, two-dimensionally structured magnetic materials. Using a laser, we create thermal landscapes in a magnetic medium that result in modulations of the saturation magnetization and in the control of spin-wave characteristics. This method is demonstrated by the realization of fully reconfigurable oneand two-dimensional magnonic crystals-artificial periodic magnetic lattices.There are two general approaches in designing the properties of a material: changing its chemical composition and structuring. Structuring has been used to control mechanical 10 , optical 11 , and even magnetic properties 12,13 . Periodic variation of the magnetic material's parameters allows the realization of magnonic crystals with novel properties not found in the unstructured material. For example, the dispersion relation of spin waves can be controlled to achieve new schemes for spin-wave-based computing [1][2][3][4][5][14][15][16][17] . The spin-wave dispersion relation depends on many parameters, such as the geometry of the spin-wave waveguide (film thickness and waveguide width), external magnetic field H ext , and saturation magnetization M S . In fact, all of these parameters have already been used to fabricate magnonic crystals [6][7][8]12,13,[18][19][20] : arrays of metallic stripes, etched grooves or antidots, biasing magnetic field or periodic variation of the saturation magnetization using ion implantation.However, all available methods for the fabrication of such spintronic devices result in spatially constant magnetic materials. J. Topp et al. have shown that the parameters of magnetic materials can be changed locally after the rather time-consuming fabrication of the spintronic device 21 -but the functionality of the device stays the same. Here, we present an alternative method for structuring and use it for the manipulation of spin waves-namely fully tunable light patterns (computer-generated holograms), in which optically induced thermal patterns/landscapes modify the spinwave dispersion relation and, hence, the propagation. Thus, the proposed optically reconfigurable magnetic material allows the functionality of a magnetic element to be tuned on demand; the same element can be used as a conduit, a logic gate or a data buffering element.The set-up used for the realization of the light patterns consists of a continuous wave laser as light source, an acousto-optical modulator for temporal intensity control, and a spatial light modulator for spatial intensity control (see Fig. 1a). To study the influence of the thermal gradient ...

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Optically reconfigurable magnetic materials

et al. 2015

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“…The carriers of thermal conduction in the materials mainly include molecules, electrons, phonons, and photons. Accordingly, the thermally conductive mechanism includes molecular thermal conduction, electron thermal conduction, and photon thermal conduction [97][98][99]. Most polymers are saturated system with no free electrons, and phonons are the major thermal carriers.…”

Section: Mechanisms Of the Intrinsic Thermally Conductive Polymersmentioning

confidence: 99%

A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

Yang

Liang

et al. 2018

Adv Compos Hybrid Mater

302

124

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With the fast-developing miniaturization and integration of microelectronics packaging materials, ultrahigh-voltage electrical devices, light-emitting diodes (LEDs), and in areas which require good heat dissipation and low thermal expansion, the investigations on the polymeric composites with highly thermal conductivities and excellent thermal stabilities are urgently required, which would be beneficial to transferring the heat to the outside of the products, finally to effectively avoid substantial overheating and prolong their working life. Our article reviews recent progress in the classification, measurement methods, model and equations, mechanisms, commonly used thermally conductive fillers, and the correlative fabrication methods for the thermally conductive polymeric composites, aiming to understand and grasp how to enhance the λ value effectively. And future perspectives, focusing scientific problems and technical difficulties of the present thermally conductive polymeric composites are also described and evaluated.

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“…In the last decade, polymer materials, especially in the form of composite materials, have "conquered" new areas of usage. Development of new composites and nanocomposites increases polymer materials perspectives because they are designed to possess enhanced structural, mechanical, thermal, thermomechanical, rheological, tribological, and other properties depending on the composition of the multicomponent system [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured zinc oxide filler for modification of polymer-polymer composites: structure and tribological properties

Bochkov¹,

Kokins²,

Meri³

et al. 2015

Proc. Estonian Acad. Sci.

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Self-lubricating behaviour of materials is very demanded in industry. In this study we investigated the effect of anisometric nanostructured ZnO filler (tetrapod shaped particles with arm length of 70-100 nm and diameter of 10 nm) and ethylene-1-octene copolymer on structure and tribological properties of isotactic polypropylene (PP). It was observed that addition of EOC caused the increment of roughness as well as of the coefficient of friction (COF) of the investigated composites. Addition of ZnO, in its turn, caused decrement of the COF and improvement of surface quality at certain nanofiller contents.

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Thermal Conductivity of Nanoparticles Filled Polymers

Cited by 54 publications

References 88 publications

Optically reconfigurable magnetic materials

Optically reconfigurable magnetic materials

A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

Nanostructured zinc oxide filler for modification of polymer-polymer composites: structure and tribological properties

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