Engineering Nanostructures by Decorating Magnetic Nanoparticles onto Graphene Oxide Sheets to Shield Electromagnetic Radiations

Mural, Prasanna Kumar S.; Pawar, Shital Patangrao; Jayanthi, S.; Madras, Giridhar; Sood, Anil K.; Bose, Suryasarathi

doi:10.1021/acsami.5b02703

Cited by 85 publications

(41 citation statements)

References 50 publications

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“…It was well evident that both SE T and SE A scales with thickness. A similar observation has been well established in the recent past ,. The increase in SE T with shield thickness was mainly due to enhanced network of interconnected MWNTs in the shield material.…”

Section: Resultsmentioning

confidence: 99%

Graphene Derivatives Doped with Nickel Ferrite Nanoparticles as Excellent Microwave Absorbers in Soft Nanocomposites

et al. 2017

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Herein, we report the development of soft polymeric composites containing multiwall carbon nanotubes (MWNTs, 1–3 wt%) and graphene derivatives doped with nickel ferrite nanoparticles (rGO@NF, 10 wt%) as lightweight microwave absorbers. The soft nanocomposites were designed using melt‐mixed blends of varying compositions of PC (polycarbonate) and SAN (poly styrene acrylonitrile) by compartmentalized functional nanoparticles in one of the components of the blend (here PC). Maximum attenuation of the incoming electromagnetic (EM) radiation mainly through absorption was achieved. The hetero‐dielectric media at microscopic length scale in the PC component provided large interfaces which facilitated multiple scattering thereby attenuating the incoming EM radiation. This strategy of positioning the functional nanoparticles in one of the components in the blends resulted in significantly enhanced shielding effectiveness (SE), at any given concentration of MWNTs, in contrast to PC based composites. This enhancement in SE was realized in the special morphology of the bicomponent PC/SAN=60/40 wt% blends where both the components are continuous. The enhanced SE in co‐continuous blends is due to combined effect of enhanced electrical conductivity (more precisely due to interconnected network of the nanoparticles) and the presence of a hetero‐dielectric media generating large scattering interfaces. For instance, the PC/SAN (60/40 wt%) co‐continuous blend containing 3 wt% MWNTs and 10 wt% rGO@NF manifested in a total shielding effectiveness (SET) of −32.3 dB (i. e. more than 99.9 % attenuation of incoming EM radiation) mainly through absorption.

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Section: Resultsmentioning

confidence: 99%

Graphene Derivatives Doped with Nickel Ferrite Nanoparticles as Excellent Microwave Absorbers in Soft Nanocomposites

et al. 2017

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“…A widely prescribed strategy to achieve efficient external targeting is to introduce various types of magnetic nanoparticles on the large surface of GO, which can drive the drug carriers to specific tumor tissues by a guided magnetic field. 14 15 Cu/Ni alloy, 16 Ni, 17 etc.…”

Section: -3mentioning

confidence: 99%

β-Cyclodextrin modified graphene oxide–magnetic nanocomposite for targeted delivery and pH-sensitive release of stereoisomeric anti-cancer drugs

Wang

Niu

et al. 2015

RSC Adv.

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β-cyclodextrin modified graphene oxide-magnetic (MGC) nanocomposite as an innovative drug carrier was the first developed via an effective layer-by-layer-assembly method. Doxorubicin hydrochloride (DOX) and epirubicin hydrochloride (EPI) as model drugs were loaded onto the MGC via π-π stacking, hydrogen bond and hydrophobic interaction. The MGC exhibits remarkably higher loading capacity for DOX (909.09 mg/g) and EPI (781.25 mg/g) than magnetic graphene oxide (MG). The release profiles of drug are pH-sensitive which would control the release in acidic cytoplasm of cancer cells. Furthermore, cellular uptake using fluorescein isothiocyanate (FITC) labeled MGC proves successful internalization of MGC into the cytoplasm of MCF-7 cells. The fluorescence images demonstrate that MGC/DOX, to a certain extent, displays a more excellent delivery and superior release than MGC/EPI, due to the chiral select function of β-cyclodextrin (β-CD). The pure MGC shows no obvious cytotoxicity while drug loaded MGC reveals significantly high potency of killing MCF-7 breast cancer cells, suggesting that multi-functionalized MGC is an efficient nanoplatform for targeted delivery and controlled release of stereoisomeric anticancer drugs for biomedical applications.

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“…[21] Huang et al [24] showedS Eo fP C/ABS blends where SE T of 47 dB was realized at 30 wt %l oading of nickel-coated carbon fiber.I nt he case of phenolic resin composites, Singh et al [27] showed 30.95 dB of SE T with 1, 24.5 and 24.5 %c arbon fiber,r GO and Fe(acac) 2 ,r espectively.T he SE T of À27 dB was realized in PE/PEO blends with 3wt% MWNTs and 10 vol %G O-Ni nanoparticles. [28] Yaoe tal. [29] analyzedt he EMI properties of PVC composites with 5wt% graphene and 5wt% Fe 3 O 4 ,w hich showed aS E T of 13 dB.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary Synergy in Attenuating Microwave Radiation with Cobalt‐Decorated Graphene Oxide and Carbon Nanotubes in Polycarbonate/Poly(styrene‐co‐acrylonitrile) Blends

Pawar

Bose

2015

ChemNanoMat

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Polymeric nanocomposites were developed using polycarbonate( PC) and poly(styrene-co-acrylonitrile) (SAN) containing cobaltn anoparticles decorated onto partially reduced graphene oxide (rGO) sheetsa nd multiwalled carbon nanotubes (MWNTs). In order to absorb microwave radiations, the PC phase was rendered electrically conductingb y selectively localizing the MWNTsi nt he PC phase of the blends. The synergetic effect from the conducting phase (MWNTs), the dielectric phase (rGO), and the ferromagnetic phase (cobalt nanoparticles) on microwavea bsorption was assessed by measuring the scattering parameters using avector network analyzer coupled to acoaxial line. The electromagnetic interference (EMI) shielding effectiveness (SE) was studied over ab road range of frequencies including the X-band (8-12 GHz) and the K u -band (12-18GHz). Thiss trategy resulted in enhanced electrical conductivity and facilitated in outstanding microwavea bsorption. For instance, the PC/SAN blends with MWNTs manifested significantly high total shielding effectiveness (SE T )m ainly through absorption, in contrast to PC/MWNT composites for which reflection dominatedt he attenuation mechanism.T he interconnected network of MWNTsa nd cobalt-decorated r-GO (rGO-Co)r esulted in enhanced electrical conductivity and EMI shielding effectiveness (SE). This in turn resulted in as hielding effectivenesso fÀ34 dB at 18 GHz. The mechanism of EM wave absorption wass ystematically evaluated through detailed analysiso fr elative permittivity and permeability in the measured frequencyr egime. The absorption of EM radiation was noticeably enhanced due to high dielectric and large magnetic losses in the blendsc ontaining rGO-Co and MWNTs. Moreover,itw as also realized that the significantly enhanced attenuation constant resulted in maximum microwave absorptionint he blend containing MWNT and rGO-Co.

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Engineering Nanostructures by Decorating Magnetic Nanoparticles onto Graphene Oxide Sheets to Shield Electromagnetic Radiations

Cited by 85 publications

References 50 publications

Graphene Derivatives Doped with Nickel Ferrite Nanoparticles as Excellent Microwave Absorbers in Soft Nanocomposites

Graphene Derivatives Doped with Nickel Ferrite Nanoparticles as Excellent Microwave Absorbers in Soft Nanocomposites

β-Cyclodextrin modified graphene oxide–magnetic nanocomposite for targeted delivery and pH-sensitive release of stereoisomeric anti-cancer drugs

Extraordinary Synergy in Attenuating Microwave Radiation with Cobalt‐Decorated Graphene Oxide and Carbon Nanotubes in Polycarbonate/Poly(styrene‐co‐acrylonitrile) Blends

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