Shape-controlled iron oxide nanocrystals: synthesis, magnetic properties and energy conversion applications

Liu, Jun; Wu, Zhaohui; Tian, Qingyong; Wu, W.; Xiao, Xiangheng

doi:10.1039/c6ce01307d

Cited by 65 publications

(28 citation statements)

References 270 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The particle growth can be explained by the phase distortion of the original inverse spinel and migration of iron ions to the surface and subsequent oxidation. 7,44,57,58 Indeed, the XRD patterns confirm preservation of the spinel structure during both oxidation processes. Structural reorientation of maghemite particles smaller than 100 nm in diameter is known to require temperatures over 500°C.…”

Section: Resultsmentioning

confidence: 62%

“…The versatility of possible applications reaches from adsorbents in separation processes, 1,2 enzyme immobilisation, 3 biomedicine 4,5 and catalysis 6 to energy storage. [7][8][9] In mineral processing and wastewater treatment 10 MNP are used as low-cost adsorbents which can be magnetically separated and aid in removing toxic 11 or radioactive ions. 12 For biological separation processes such as protein or DNA/RNA purification, cell sorting, algae harvesting and virus removal MNP should be chemically and mechanically inert toward the target products.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

et al. 2017

View full text Add to dashboard Cite

Iron oxide nanoparticles are of great scientific interest due to their huge versatility of applications. The oxidation process of magnetite to maghemite is difficult to monitor as both iron oxide polymorphs possess connatural chemical properties. Especially the surface composition and reactivity of these nanosystems, which are most relevant for interactions with their environment, are not completely understood. Here, the oxidation of magnetite is investigated under mild and harsh conditions in order to understand the oxidation behaviour and the chemical stability of transition forms. Therefore, the oxidation process, is investigated with Raman, Mössbauer and X-ray photoelectron spectroscopy as well as X-ray diffraction and magnetometry. The multi-analytical approach allows new insights into surface composition and rearrangement according to respective different depth profiles. For both conditions investigated, the ferrous iron components are oxidised prior to structural changes in the Fe-O vibrations and crystal structure. The process starts from the outer layers and is acid catalysed. Oxidation leads to a decrease of magnetisation which still remains higher than 54 emu g −1. The charge and surface reactivity can be affected by the different oxidation methods and the irreversible adsorption of acid molecules. Biocompatibility and catalytic properties of iron oxide nanoparticles open doors to future applications.

show abstract

Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Herein, the growth mechanism is contributing to the selective adsorption and dissolution of ionic ligands on different crystal planes. It is known that phosphate and sulfate ions adsorb on (110) and (100) surface of -Fe 2 O 3 , mainly by forming binuclear, bidentate complexes with two singly coordinated hydroxyl groups, even though other types of surface complexes are possible [14,15]. Jia et al utilized the cooperative action of phosphate and sulfate ions to synthesize single -Fe 2 O 3 crystals previously.…”

Section: Resultsmentioning

confidence: 99%

“…Simultaneously, the phosphate anions hindered the coordination reaction with the exposed Fe 3+ ions on the initial -Fe 2 O 3 nuclei. Therefore, sulfate ions slightly affected the growth of - a high temperature, the tips of the capsule-shaped nanorods started to dissolve along the [001] direction, as the (001) plane was almost entirely exposed to the solution [14][15][16]. In this stage, the sulfate ions acted as a shape controller to induce the anisotropic growth.…”

Section: Resultsmentioning

confidence: 99%

Stepwise Growth of Hollow Hexagonalα-Fe₂O₃Nanocrystals

Wang

Zhang

Wang

et al. 2016

Journal of Nanomaterials

View full text Add to dashboard Cite

Magnetic nanocrystals have attracted much attention in various fields because of their fundamental size and shape dependent magnetism and many technological applications. In this study, hollow hexagonal -Fe 2 O 3 nanocrystals were synthesized using a normal hydrothermal method. A full growth evolution map of nanocrystals with different shapes was investigated to elucidate the growth mechanism. We had demonstrated the growth mechanism using the selective adsorption and dissolution theory and interestingly found that K + cations were also a key point during the process of -Fe 2 O 3 nanocrystals growing. At last, the magnetic properties of the hexagonal -Fe 2 O 3 nanocrystals were also investigated.

show abstract

“…Eventually, high crystalline nanoparticles will be resulted by repeated dissolution and recrystallization processes induced in the growth of MNPs. [82] There are numerous reports in the literature on exploiting the hydrothermal synthesis for producing iron oxide MNPs, either in the presence or absence of stabilizing surfactants. [83] In 1980, a comprehensive study conducted by Sapieszko et al, utilized the hydrothermal decomposition of metal chelates in mixture with different additives for producing colloidal solids of different chemical compositions and morphologies.…”

Section: Hydrothermal/or Solvothermal Synthesismentioning

confidence: 99%

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

Mosayebi

Kiyasatfar

Laurent

2017

Adv Healthcare Materials

204

171

View full text Add to dashboard Cite

In order to translate nanotechnology into medical practice, magnetic nanoparticles (MNPs) have been presented as a class of non‐invasive nanomaterials for numerous biomedical applications. In particular, MNPs have opened a door for simultaneous diagnosis and brisk treatment of diseases in the form of theranostic agents. This review highlights the recent advances in preparation and utilization of MNPs from the synthesis and functionalization steps to the final design consideration in evading the body immune system for therapeutic and diagnostic applications with addressing the most recent examples of the literature in each section. This study provides a conceptual framework of a wide range of synthetic routes classified mainly as wet chemistry, state‐of‐the‐art microfluidic reactors, and biogenic routes, along with the most popular coating materials to stabilize resultant MNPs. Additionally, key aspects of prolonging the half‐life of MNPs via overcoming the sequential biological barriers are covered through unraveling the biophysical interactions at the bio–nano interface and giving a set of criteria to efficiently modulate MNPs' physicochemical properties. Furthermore, concepts of passive and active targeting for successful cell internalization, by respectively exploiting the unique properties of cancers and novel targeting ligands are described in detail. Finally, this study extensively covers the recent developments in magnetic drug targeting and hyperthermia as therapeutic applications of MNPs. In addition, multi‐modal imaging via fusion of magnetic resonance imaging, and also innovative magnetic particle imaging with other imaging techniques for early diagnosis of diseases are extensively provided.

show abstract

Shape-controlled iron oxide nanocrystals: synthesis, magnetic properties and energy conversion applications

Abstract: Iron oxide nanocrystals (IONCs) with various geometric morphologies show excellent physical and chemical properties and have received extensive attention in recent years.

Cited by 65 publications

References 270 publications

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

Stepwise Growth of Hollow Hexagonalα-Fe₂O₃Nanocrystals

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

Contact Info

Product

Resources

About

Shape-controlled iron oxide nanocrystals: synthesis, magnetic properties and energy conversion applications

Abstract: Iron oxide nanocrystals (IONCs) with various geometric morphologies show excellent physical and chemical properties and have received extensive attention in recent years.

Cited by 65 publications

References 270 publications

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

Oxidation of magnetite nanoparticles: impact on surface and crystal properties

Stepwise Growth of Hollow Hexagonalα-Fe2O3Nanocrystals

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

Contact Info

Product

Resources

About

Stepwise Growth of Hollow Hexagonalα-Fe₂O₃Nanocrystals