Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review.

Varanda, Laudemir Carlos; Souza, Caio Guilherme Secco de; Moraes, Daniel A.; Neves, Herbert Rodrigo; Souza, João Batista; Silva, Mônica Ferreira da; Bini, Rafael A.; Albers, Rebecca Faggion; Silva, Tiago Lima da; Beck, Watson

doi:10.1590/0001-3765201920181180

Cited by 40 publications

(26 citation statements)

References 167 publications

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“…Several other methods have been reported for the synthesis of Fe 3 O 4 nanoparticles, such as chemical methods using plant extracts [ 81 , 82 ] and bacteria [ 83 , 84 ] as reducing agents, thermal decomposition/pyrolysis of organo-metallic precursors [ 85 , 86 ], ultrasound irradiation [ 87 ], gamma radiolysis [ 88 ], thesol–gel method [ 89 ] etc. Most of these methods yield polydisperse nanoparticles, surface capped nanoparticles and nanoparticles with impurities, in addition to poor reproducibility.…”

Section: Synthesis Of Ionpsmentioning

confidence: 99%

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Magnetic Iron Oxide Nanoparticle (IONP) Synthesis to Applications: Present and Future

et al. 2020

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Iron oxides are chemical compounds which have different polymorphic forms, including γ-Fe2O3 (maghemite), Fe3O4 (magnetite), and FeO (wustite). Among them, the most studied are γ-Fe2O3 and Fe3O4, as they possess extraordinary properties at the nanoscale (such as super paramagnetism, high specific surface area, biocompatible etc.), because at this size scale, the quantum effects affect matter behavior and optical, electrical and magnetic properties. Therefore, in the nanoscale, these materials become ideal for surface functionalization and modification in various applications such as separation techniques, magnetic sorting (cells and other biomolecules etc.), drug delivery, cancer hyperthermia, sensing etc., and also for increased surface area-to-volume ratio, which allows for excellent dispersibility in the solution form. The current methods used are partially and passively mixed reactants, and, thus, every reaction has a different proportion of all factors which causes further difficulties in reproducibility. Direct active and complete mixing and automated approaches could be solutions to this size- and shape-controlled synthesis, playing a key role in its exploitation for scientific or technological purposes. An ideal synthesis method should be able to allow reliable adjustment of parameters and control over the following: fluctuation in temperature; pH, stirring rate; particle distribution; size control; concentration; and control over nanoparticle shape and composition i.e., crystallinity, purity, and rapid screening. Iron oxide nanoparticle (IONP)-based available clinical applications are RNA/DNA extraction and detection of infectious bacteria and viruses. Such technologies are important at POC (point of care) diagnosis. IONPs can play a key role in these perspectives. Although there are various methods for synthesis of IONPs, one of the most crucial goals is to control size and properties with high reproducibility to accomplish successful applications. Using multiple characterization techniques to identify and confirm the oxide phase of iron can provide better characterization capability. It is very important to understand the in-depth IONP formation mechanism, enabling better control over parameters and overall reaction and, by extension, properties of IONPs. This work provides an in-depth overview of different properties, synthesis methods, and mechanisms of iron oxide nanoparticles (IONPs) formation, and the diverse range of their applications. Different characterization factors and strategies to confirm phase purity in the IONP synthesis field are reviewed. First, properties of IONPs and various synthesis routes with their merits and demerits are described. We also describe different synthesis strategies and formation mechanisms for IONPs such as for: wustite (FeO), hematite (α-Fe2O3), maghemite (ɤ-Fe2O3) and magnetite (Fe3O4). We also describe characterization of these nanoparticles and various applications in detail. In conclusion, we present a detailed overview on the properties, size-controlled synthesis, formation mechanisms and applications of IONPs.

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Section: Synthesis Of Ionpsmentioning

confidence: 99%

“…In this method, FeCl 2 ·4H 2 O and FeCl 3 ·6H 2 O were dissolved in degassed water, which was followed by the addition of NaOH at room temperature [ 86 , 95 ]. This is a one pot direct synthesis method.…”

Section: Different Mechanisms Of Iron Oxide Nanoparticle Synthesismentioning

confidence: 99%

Magnetic Iron Oxide Nanoparticle (IONP) Synthesis to Applications: Present and Future

et al. 2020

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“…Este trabalho relata nanopartículas de prata estabilizadas com citrato (AgNPs) sintetizadas pela redução química do íon nitrato com boro-hidreto de sódio, em diferentes pHs (2)(3)(4)(5)(6)(7)(8)(9). As AgNPs sintetizadas por este método apresentaram distribuição de tamanho de 5 a 249 nm dependente do pH, conforme determinado por espalhamento dinâmico de luz, além de morfologia esférica, conforme determinado por microscopia eletrônica de transmissão.…”

Section: Introductionunclassified

pH effect on the synthesis of different size silver nanoparticles evaluated by DLS and their size-dependent antimicrobial activity

et al. 2020

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This paper reports citrate-stabilized silver nanoparticles (AgNPs) synthesized by nitrate ion chemical reduction with sodium borohydride, at different pHs (2–9). The AgNPs synthesized by this method exhibited size distribution from 5 to 249 nm, depending on pH, as determined by dynamic light scattering, and morphology spherical, as determined by transmission electron microscopy. In pH range 3–7 occurred aggregation of the nanoparticles. The size distribution depending on pH was determined by dynamic light scattering. The zeta potential was determined, and the colloidal stability was correlated with nanoparticles aggregation at different pHs. The size-dependent antimicrobial activity was evaluated for two solutions, wherein both samples exhibited antimicrobial activity, although the smallest AgNPs without agglomeration have enhanced antimicrobial properties.

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“…Although there are some problems associated with thermal decomposition methods, such as the need for air-free reaction conditions, the use of toxic reactants, and limited availability of single-source precursors, it constitutes a very common method. 115,116 Solvothermal and hydrothermal methods are alternative processes employed for the synthesis of nanoclusters. The solvothermal approach uses organic solvents as reaction media, while the hydrothermal route consists of a special case using water as the solvent.…”

Section: Cdse Magic-sized Nanoclustersmentioning

confidence: 99%

“…LEDs are already a solid-state frontier where energy-saving white LEDs hold much significance. MSNCs are potentially excellent candidates for applications in white LEDs, showing the right equilibrium of emission to produce almost pure white Please do not adjust margins Please do not adjust margins light according to CIE coordinates (0.31, 0.33) 14,68,85,116,117,196 while MSNCs of CdSe have been evaluated for their characteristic to emit white light. 30,105,110,[197][198][199] MSNCs can work as a single source white light emitter, which has several advantages over hybrid LEDs with mixed red, green and blue phosphors.…”

Section: White Light Emission From Cdse Msncsmentioning

confidence: 99%

Magic-sized CdSe nanoclusters: a review on synthesis, properties and white light potential

Singh

Priyanka

et al. 2021

Mater. Adv.

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Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review.

Abstract: Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review.. An Acad Bras Cienc 91: e20181180.

Cited by 40 publications

References 167 publications

Magnetic Iron Oxide Nanoparticle (IONP) Synthesis to Applications: Present and Future

Magnetic Iron Oxide Nanoparticle (IONP) Synthesis to Applications: Present and Future

pH effect on the synthesis of different size silver nanoparticles evaluated by DLS and their size-dependent antimicrobial activity

Magic-sized CdSe nanoclusters: a review on synthesis, properties and white light potential

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