Magnetic oxide particles with gold nanoshells: Synthesis, properties and cytotoxic effects

Koktan, Jakub; Královec, Karel; Havelek, Radim; Kuličková, Jarmila; Řezanka, Pavel; Kaman, Ondřej

doi:10.1016/j.colsurfa.2017.02.052

Cited by 8 publications

(11 citation statements)

References 30 publications

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“…In several paramagnetic materials (Koktan et al, 2017) such as in hydrated salts, as the temperature is raised, the thermal agitation of the spins reduces even this small amount of alignment. In 1895, Curie established that in these cases, the susceptibility, χ, which is defined as (Goldman, 2006).…”

Section: Paramagnetism and Diamagnetismmentioning

confidence: 99%

Magnetic field generation in the water treatment perspectives: An overview

Ghernaout

2018

Int. j. adv. appl. sci.

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In the last few decades, many researches on the effects of magnetic field (MF) on water have been reported; however, still many arguments and doubts are present. This review aims to focus on the basic properties implied in magnetic phenomena generation at the atomic and electronic level of matter. Fundamentals of magnetism and origin of magnetic effect will be discussed. Both paramagnetism and diamagnetism are very crucial in the examination of atomic and molecular structure; however, these effects are very weak and have no real practical importance. Large scale magnetic effects resulting in commercially important materials appear in atoms and ions of only a few metallic elements notably Fe, Co, Ni, and some of the rare earths. In alloys or oxides of some materials containing these elements and some neighboring ions such as Mn, there is a crucial improvement of the atomic spin effect. This enhancement comes about from the cooperative interaction of large numbers (10 13 -10 14 ) of these atomic spins producing a region where all atomic spins within it are aligned parallel (positive exchange interaction). These materials are called ferromagnetic. In spite of the achieved performances on MF technologies, there is a huge work to be performed for better understanding and controlling of magnetic water treatment.

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Section: Paramagnetism and Diamagnetismmentioning

confidence: 99%

Magnetic field generation in the water treatment perspectives: An overview

Ghernaout

2018

Int. j. adv. appl. sci.

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“…The pH dependence of the zeta potential of the TGfunctionalized nanoshells was governed by the native behavior of MZF@sil@Au particles since the thioglycerol moiety in water does not participate significantly in any ionization equilibria, at least not at moderate pH. This explanation is also supported by the measurement of the pH dependence of the zeta potential of native gold nanoshells with silicacoated magnetic cores in [22]. The viability and proliferation of MCF-7 cells incubated with gold nanoshells functionalized with four different model compounds (DMSA, TG, MUA, MTAB) were assessed in real-time by using the label-free xCELLigence system (Figure 6).…”

Section: Gold Nanoshells Functionalized With Model Organic Moleculesmentioning

confidence: 66%

“…The pH dependence of the zeta potential of the TG-functionalized nanoshells was governed by the native behavior of MZF@sil@Au particles since the thioglycerol moiety in water does not participate significantly in any ionization equilibria, at least not at moderate pH. This explanation is also supported by the measurement of the pH dependence of the zeta potential of native gold nanoshells with silica-coated magnetic cores in [22].…”

Section: Gold Nanoshells Functionalized With Model Organic Moleculesmentioning

confidence: 66%

“…The gold nanoshells enclosing silica-coated ferrite cores (MZF@sil@Au) were prepared using a multistep procedure that consisted of (i) the formation of a PDADMAC/PSS polyelectrolyte multilayer on the silica surface of MZF@sil via a layer-by-layer self-assembly technique [20], (ii) adsorption of ultrafine gold seeds synthesized according to Duff [21], (iii) the growth of the gold seeds to coalescence by reduction of a suitable soluble gold(III) precursor, and (iv) size fractionation. The whole procedure was based on previously published reports [18,22] but involved significant modifications, and thus the full details are provided below.…”

Section: Preparation Of Gold Nanoshells With Silica-coated Ferrite Coresmentioning

confidence: 99%

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Multimodal Contrast Agent Enabling pH Sensing Based on Organically Functionalized Gold Nanoshells with Mn-Zn Ferrite Cores

et al. 2022

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Highly complex nanoparticles combining multimodal imaging with the sensing of physical properties in biological systems can considerably enhance biomedical research, but reports demonstrating the performance of a single nanosized probe in several imaging modalities and its sensing potential at the same time are rather scarce. Gold nanoshells with magnetic cores and complex organic functionalization may offer an efficient multimodal platform for magnetic resonance imaging (MRI), photoacoustic imaging (PAI), and fluorescence techniques combined with pH sensing by means of surface-enhanced Raman spectroscopy (SERS). In the present study, the synthesis of gold nanoshells with Mn-Zn ferrite cores is described, and their structure, composition, and fundamental properties are analyzed by powder X-ray diffraction, X-ray fluorescence spectroscopy, transmission electron microscopy, magnetic measurements, and UV-Vis spectroscopy. The gold surface is functionalized with four different model molecules, namely thioglycerol, meso-2,3-dimercaptosuccinate, 11-mercaptoundecanoate, and (11-mercaptoundecyl)-N,N,N-trimethylammonium bromide, to analyze the effect of varying charge and surface chemistry on cells in vitro. After characterization by dynamic and electrophoretic light scattering measurements, it is found that the particles do not exhibit significant cytotoxic effects, irrespective of the surface functionalization. Finally, the gold nanoshells are functionalized with a combination of 4-mercaptobenzoic acid and 7-mercapto-4-methylcoumarin, which introduces a SERS active pH sensor and a covalently attached fluorescent tag at the same time. 1H NMR relaxometry, fluorescence spectroscopy, and PAI demonstrate the multimodal potential of the suggested probe, including extraordinarily high transverse relaxivity, while the SERS study evidences a pH-dependent spectral response.

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“…1) to diversify a number of possible blending combinations. The ranges of each design variable are carefully constrained according to the literatures 2,12,31 . These are listed in Table 1.…”

Section: Modellingmentioning

confidence: 99%

Tailoring the Spectral Absorption Coefficient of a Blended Plasmonic Nanofluid Using a Customized Genetic Algorithm

Seo¹,

Qin²,

Lee³

et al. 2020

Sci Rep

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Recently, plasmonic nanofluids (i.e., a suspension of plasmonic nanoparticles in a base fluid) have been widely employed in direct-absorption solar collectors because the localized surface plasmon supported by plasmonic nanoparticles can greatly improve the direct solar thermal conversion performance. Considering that the surface plasmon resonance frequency of metallic nanoparticles, such as gold, silver, and aluminum, is usually located in the ultraviolet to visible range, the absorption coefficient of a plasmonic nanofluid must be spectrally tuned for full utilization of the solar radiation in a broad spectrum. In the present study, a modern design process in the form of a genetic algorithm (GA) is applied to the tailoring of the spectral absorption coefficient of a plasmonic nanofluid. To do this, the major components of a conventional GA, such as the gene description, fitness function for the evaluation, crossover, and mutation function, are modified to be suitable for the inverse problem of tailoring the spectral absorption coefficient of a plasmonic nanofluid. By applying the customized GA, we obtained an optimal combination for a blended nanofluid with the desired spectral distribution of the absorption coefficient, specifically a uniform distribution, solar-spectrum-like distribution, and a step-function-like distribution. The resulting absorption coefficient of the designed plasmonic nanofluid is in good agreement with the prescribed spectral distribution within about 10% to 20% of error when six types of nanoparticles are blended. Finally, we also investigate how the inhomogeneous broadening effect caused by the fabrication uncertainty of the nanoparticles changes their optimal combination. Plasmonic nanofluids, which contain a suspension of plasmonic nanoparticles in a base fluid, have been proposed as effective working fluids to directly convert solar radiation to thermal energy 1. Owing to the resonance characteristics of the localized surface plasmon (LSP), the absorption efficiency of the nanoparticles can be greatly enhanced with the excitation of the LSP, offering great potential in solar thermal applications. For instance, a direct-absorption solar collector (DASC) combined with a plasmonic nanofluid has drawn much attention for solar thermal energy harvesting in recent decades 1-5. Recently, Qin et al. 6 showed how the spectral absorption coefficient of a plasmonic nanoparticle should be tuned (i.e., either uniformly or following the solar spectrum) by engineering nanoparticle suspensions to exploit the solar radiation maximally with the given constraint of the total particle concentration. Therefore, the effective tuning of the spectral absorption coefficients of plasmonic nanofluids is crucial for improving the thermal performance capabilities of DASCs. As suggested by Lee et al. 1 , broadband absorption spectra can be designed by blending multiple types of nanoparticles given that the resonance wavelength of the LSP depends on the material, size and shape of the nanoparticles. The simplest a...

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Magnetic oxide particles with gold nanoshells: Synthesis, properties and cytotoxic effects

Cited by 8 publications

References 30 publications

Magnetic field generation in the water treatment perspectives: An overview

Magnetic field generation in the water treatment perspectives: An overview

Multimodal Contrast Agent Enabling pH Sensing Based on Organically Functionalized Gold Nanoshells with Mn-Zn Ferrite Cores

Tailoring the Spectral Absorption Coefficient of a Blended Plasmonic Nanofluid Using a Customized Genetic Algorithm

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