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Facile and sustainable synthesis of shaped iron oxide nanoparticles: effect of iron precursor salts on the shapes of iron oxides.

Sayed FN, Polshettiwar V - Sci Rep (2015)

Bottom Line: Notably, all the six shapes of iron oxides can be synthesised using exactly same synthetic protocol, by simply changing the precursor iron salts.Several of the synthesised shapes are not reported before.This novel protocol is relatively easy to implement and could contribute to overcome the challenge of obtaining various shaped iron oxides in economical and sustainable manner.

View Article: PubMed Central - PubMed

Affiliation: Nanocatalysis Laboratory (NanoCat), Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR), Mumbai, India.

ABSTRACT
A facile and sustainable protocol for synthesis of six different shaped iron oxides is developed. Notably, all the six shapes of iron oxides can be synthesised using exactly same synthetic protocol, by simply changing the precursor iron salts. Several of the synthesised shapes are not reported before. This novel protocol is relatively easy to implement and could contribute to overcome the challenge of obtaining various shaped iron oxides in economical and sustainable manner.

No MeSH data available.


Field dependent magnetization of nanorod samples at 2 K and 300 K.
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f9: Field dependent magnetization of nanorod samples at 2 K and 300 K.

Mentions: Iron based hydroxides and oxides show interesting magnetic properties which are highly influenced by their phases, shape and size. Ferrihydrites behaves antiferromagnetically below 120 K however ferromagnetism arises due to uncompensated spins at or inside of the particles26. Similarly goethite is expected to behave antiferromagnetically at about 400 K27. The hematite undergoes two type of magnetic transitions at temperatures 950 K and 260 K, known as Neel Temperature (TN) and Morin temperature respectively (TM)28. Below TN, it shows week ferromagnetism and at TM weak ferromagnetic to antiferromagnetic transition occurs. In present study, different as-prepared as well as heat treated iron hydroxides/oxides, samples were analyzed for their magnetic properties by measuring their field dependent magnetization in the range of −2T to 2T, below and above TM i.e. 2 K and 300 K. The representative field dependent magnetization of nanorod samples (Fe-1) are shown in Fig. 9.


Facile and sustainable synthesis of shaped iron oxide nanoparticles: effect of iron precursor salts on the shapes of iron oxides.

Sayed FN, Polshettiwar V - Sci Rep (2015)

Field dependent magnetization of nanorod samples at 2 K and 300 K.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4419518&req=5

f9: Field dependent magnetization of nanorod samples at 2 K and 300 K.
Mentions: Iron based hydroxides and oxides show interesting magnetic properties which are highly influenced by their phases, shape and size. Ferrihydrites behaves antiferromagnetically below 120 K however ferromagnetism arises due to uncompensated spins at or inside of the particles26. Similarly goethite is expected to behave antiferromagnetically at about 400 K27. The hematite undergoes two type of magnetic transitions at temperatures 950 K and 260 K, known as Neel Temperature (TN) and Morin temperature respectively (TM)28. Below TN, it shows week ferromagnetism and at TM weak ferromagnetic to antiferromagnetic transition occurs. In present study, different as-prepared as well as heat treated iron hydroxides/oxides, samples were analyzed for their magnetic properties by measuring their field dependent magnetization in the range of −2T to 2T, below and above TM i.e. 2 K and 300 K. The representative field dependent magnetization of nanorod samples (Fe-1) are shown in Fig. 9.

Bottom Line: Notably, all the six shapes of iron oxides can be synthesised using exactly same synthetic protocol, by simply changing the precursor iron salts.Several of the synthesised shapes are not reported before.This novel protocol is relatively easy to implement and could contribute to overcome the challenge of obtaining various shaped iron oxides in economical and sustainable manner.

View Article: PubMed Central - PubMed

Affiliation: Nanocatalysis Laboratory (NanoCat), Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR), Mumbai, India.

ABSTRACT
A facile and sustainable protocol for synthesis of six different shaped iron oxides is developed. Notably, all the six shapes of iron oxides can be synthesised using exactly same synthetic protocol, by simply changing the precursor iron salts. Several of the synthesised shapes are not reported before. This novel protocol is relatively easy to implement and could contribute to overcome the challenge of obtaining various shaped iron oxides in economical and sustainable manner.

No MeSH data available.