Solubilization, dispersion and stabilization of magnetic nanoparticles in water and non-aqueous solvents: recent trends

Kharisov, Boris I.; Dias, H. V. Rasika; Kharissova, Oxana V.; Vázquez, Alejandro; Flores-Peña, Yolanda; Fuente, Idalia Gómez de la

doi:10.1039/c4ra06902a

Cited by 133 publications

(82 citation statements)

References 123 publications

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“…Surface‐adsorbed organic, but also inorganic ligands have a tremendous effect on the nucleation and growth of the nanocrystals, on their chemical and physical properties (including dispersion and assembly behavior) and on their performance (e.g., as electrical conductors or as sensors) . For processing, and generally also for the final application of nanoparticles, the surface ligands have to be tuned to achieve high colloidal stability without aggregation of nanoparticles . In this respect, surfactants, typically consisting of a coordinating head group and a long alkyl chain, bind to the nanoparticle surface during synthesis giving access to shape and size controlled nanocrystals with colloidal stability in nonpolar solvents .…”

Section: Surface Chemistrymentioning

confidence: 99%

Mechanistic Aspects in the Formation, Growth and Surface Functionalization of Metal Oxide Nanoparticles in Organic Solvents

Deshmukh

Niederberger

2017

Chemistry A European J

109

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The synthesis of metal oxide nanoparticles in organic solvents, so-called nonaqueous (or nonhydrolytic) processes represent powerful alternatives to aqueous approaches and have become an independent research field. 10 Years ago, when we published our first review on organic reaction pathways in nonaqueous sol-gel approaches, the number of examples was relatively limited. Nowadays, it is almost impossible to provide an exhaustive overview. Here we review the development of the last few years, without neglecting pioneering examples, which help to follow the historical development. The importance of a profound understanding of mechanistic aspects of nanoparticle crystallization and formation mechanisms can't be overestimated, when it comes to the design of rational synthesis concepts under minimization of trial-and-error experiments. The main reason for the progress in mechanistic understanding lies in the availability of characterization tools that make it possible to monitor chemical reactions from the dissolution of the precursor to the nucleation and growth of the nanoparticles, by ex situ methods involving sampling after different reaction times, but more and more also by in situ studies. After a short introduction to experimental aspects of nonaqueous sol-gel routes to metal oxide nanoparticles, we provide an overview of the main and basic organic reaction pathways in these approaches. Afterwards, we summarize the main characterization methods to study formation mechanisms, and then we discuss in great depth the chemical formation mechanisms of many different types of metal oxide nanoparticles. The review concludes with a paragraph on selected crystallization mechanisms reported for nonaqueous systems and a few illustrative examples of nonaqueous sol-gel concepts applied to surface chemistry.

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Section: Surface Chemistrymentioning

confidence: 99%

Mechanistic Aspects in the Formation, Growth and Surface Functionalization of Metal Oxide Nanoparticles in Organic Solvents

Deshmukh

Niederberger

2017

Chemistry A European J

109

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“…Among all the ferrites, spinel copper ferrite is one of the most important ferrite and finds application as ferro fluids, humidity sensor, gas sensor [18] as catalyst for organic reactions and are used in multilayer chip induction, high speed digital tape or recording disks, rod antennas etc. [19]. In this study, we make use of magnetic property of nano crystalline copper ferrite in the removal of dyes from effluents by adsorption as this property of ferrites is not much investigated.…”

Section: Introductionmentioning

confidence: 99%

Removal of malachite green from aqueous solution by magnetic CuFe2O4 nano-adsorbent synthesized by one pot solution combustion method

et al. 2017

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In the present investigation nano copper ferrite, CuFe 2 O 4 (CF) is synthesized by one pot energy saving solution combustion synthesis. The combustion derived copper ferrite nanoadsorbent is characterized by powder X-ray diffraction, Fourier transform infra-red spectroscopy, scanning electron microscopy, transmission electron microscopy and UV-Vis spectroscopy. The magnetic behavior is studied by Vibrating sample magnetometer measurements and the results shows it's a soft ferromagnet with low saturation magnetization and coercive effect. CF nanopowder is used as good magnetically separable nanoadsorbent. Adsorption property is evaluated by the removal of malachite green, a dye which is widely used by many industries, from its aqueous solution. Various parameters like contact time (5-30 min), adsorbent loading (0-45 mg) are investigated systematically by batch experiments. Adsorption isotherms and kinetic studies also conducted which shows that the adsorption follows pseudo second order mechanism. The experimental data fitted well with the Langmuir isotherm (R 2 = 0.978), yielding a maximum adsorption capacity of 22 mg/g. The optimum adsorbent dose was found to be 40 mg/L and stirring time experiment reveals that 85% of decolourization was observed for 30 min of stirring at neutral pH which is much more efficient than those reported in literature. Graphical abstract

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“…To allow for interaction, polyelectrolytes containing carboxyl and ammonium bromide are used to interact with Al NPs and Fe 2 O 3 NPs, respectively, which is attributed to powerful interactions between COO and Al-OH, 28 as well as between N and Fe-OH. 29 The zeta potentials (z) of the modied NPs were analyzed and the results are shown in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

A new strategy for the fabrication of high performance reactive microspheres via energetic polyelectrolyte assembly

Zhang

et al. 2017

RSC Adv.

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Since the thermite reaction in aluminum-based nanostructured energetic materials (NEMs) is closely involved with Al and oxide nanoparticles (NPs), intimate interfacial contact between the Al and oxide NPs is widely considered to be a key parameter for the NEMs with high reactivity. With the aim to overcome the disadvantage of inert modifiers without energetic groups, used in the assembly approach, which is a cutting-edge solution to precisely organize the arrangement of the Al and oxide NPs and lead to enhanced intimacy, we successfully prepared GAP-based (GAP, glycidyl azide polymer) energetic polyelectrolytes (GEPEs) and demonstrated electrostatic assembly as a facile way to fabricate high performance, reactive Al/Fe 2 O 3 microspheres after modification of the Al and Fe 2 O 3 NPs with the GEPEs.The pressurization rate of the obtained reactive microspheres, a relative measurement of the reactivity, reached 410.36 MPa s À1, which is the highest value obtained so far, and is 1-2 orders of magnitude higher than that of other reported Al/Fe 2 O 3 NEMs. The incorporated GEPEs serve three main roles:GEPEs act as a modifier by interacting strongly with the NPs, and improve the intimacy of the Al and Fe 2 O 3 via powerful electrostatic attraction between the modified NPs; the assembly of the reactive microspheres can be achieved through the directing assembly of the GEPEs themselves; internal gas released by the decomposition of energetic sites existing inside the assembled microspheres rapidly separates the NPs to prevent adverse sintering and to weaken the nanostructure loss during the reaction, resulting in an improvement of the reactivity.

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Solubilization, dispersion and stabilization of magnetic nanoparticles in water and non-aqueous solvents: recent trends

Abstract: Solubilization and stabilization techniques for magnetic nanoparticles in water and in non-aqueous solvents are reviewed.

Cited by 133 publications

References 123 publications

Mechanistic Aspects in the Formation, Growth and Surface Functionalization of Metal Oxide Nanoparticles in Organic Solvents

Mechanistic Aspects in the Formation, Growth and Surface Functionalization of Metal Oxide Nanoparticles in Organic Solvents

Removal of malachite green from aqueous solution by magnetic CuFe2O4 nano-adsorbent synthesized by one pot solution combustion method

A new strategy for the fabrication of high performance reactive microspheres via energetic polyelectrolyte assembly

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