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Ferric Phosphate Hydroxide Microstructures Affect Their Magnetic Properties.

Zhao J, Zhang Y, Run Z, Li P, Guo Q, Pang H - ChemistryOpen (2015)

Bottom Line: Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions.More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology.These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.

ABSTRACT
Uniformly sized and shape-controlled nanoparticles are important due to their applications in catalysis, electrochemistry, ion exchange, molecular adsorption, and electronics. Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions. Using controlled variations in the reaction conditions, such as reaction time, temperature, and amount of hexadecyltrimethylammonium bromide (CTAB), the crystals can be grown as almost perfect hyperbranched microcrystals at 180 °C (without CTAB) or relatively monodisperse particles at 220 °C (with CTAB). The large hyperbranched structure of Fe4(OH)3(PO4)3 with a size of ∼19 μm forms with the "fractal growth rule" and shows many branches. More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology. Interestingly, the blocking temperature (T B) shows a dependence on size and shape, and a smaller size resulted in a lower T B. These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.

No MeSH data available.


Related in: MedlinePlus

SEM images of as-prepared Fe4(OH)3(PO4)3 samples. a,b) N1, c,d) N2, and e,f) N3.
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fig02: SEM images of as-prepared Fe4(OH)3(PO4)3 samples. a,b) N1, c,d) N2, and e,f) N3.

Mentions: Figures 2 a, b display typical scanning electron microscopy (SEM) images of the product N1 prepared with Fe(NO3)3⋅9 H2O (0.202 g ) and Na3PO4⋅12 H2O (0.19 g ) in H2O (20 mL ) at 180 °C for 16 h. From these images, it could easily be seen that the product is composed of hexa-cone hyperbranched structures with a size of ∼8–9 μm. The high magnification image of N1 clearly shows that the hexa-cone hyperbranched microcrystal is perfect with a smooth surface and six branches. Further reactions with prolonged time and increased temperature were then done. Figures 2 c, d show SEM images of the product N2 prepared with Fe(NO3)3⋅9 H2O (0.202 g) and Na3PO4⋅12 H2O (0.19 g) in H2O (20 mL) at 180 °C for 24 h, which is the same as earlier conditions except for a prolonged reaction time of 24 h. N2 is also composed of hexa-cone hyperbranched structures with a size of ∼17 μm, but single branches are slimmer. More importantly, the surfaces are uneven and rough, which is probably due to the prolonged reaction time and growth of crystals. Figures 2 e, f show SEM images of the product N3 prepared under the same conditions as for N1 but with an increased temperature of 220 °C. N3 was found to have a larger hyperbranched structure with a size of ∼19 μm formed with the “fractal growth rule”. There are many branches, and each branch is composed of a great number of naturally symmetrical nanocrystals in as seen in Figure 2 f.


Ferric Phosphate Hydroxide Microstructures Affect Their Magnetic Properties.

Zhao J, Zhang Y, Run Z, Li P, Guo Q, Pang H - ChemistryOpen (2015)

SEM images of as-prepared Fe4(OH)3(PO4)3 samples. a,b) N1, c,d) N2, and e,f) N3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4522176&req=5

fig02: SEM images of as-prepared Fe4(OH)3(PO4)3 samples. a,b) N1, c,d) N2, and e,f) N3.
Mentions: Figures 2 a, b display typical scanning electron microscopy (SEM) images of the product N1 prepared with Fe(NO3)3⋅9 H2O (0.202 g ) and Na3PO4⋅12 H2O (0.19 g ) in H2O (20 mL ) at 180 °C for 16 h. From these images, it could easily be seen that the product is composed of hexa-cone hyperbranched structures with a size of ∼8–9 μm. The high magnification image of N1 clearly shows that the hexa-cone hyperbranched microcrystal is perfect with a smooth surface and six branches. Further reactions with prolonged time and increased temperature were then done. Figures 2 c, d show SEM images of the product N2 prepared with Fe(NO3)3⋅9 H2O (0.202 g) and Na3PO4⋅12 H2O (0.19 g) in H2O (20 mL) at 180 °C for 24 h, which is the same as earlier conditions except for a prolonged reaction time of 24 h. N2 is also composed of hexa-cone hyperbranched structures with a size of ∼17 μm, but single branches are slimmer. More importantly, the surfaces are uneven and rough, which is probably due to the prolonged reaction time and growth of crystals. Figures 2 e, f show SEM images of the product N3 prepared under the same conditions as for N1 but with an increased temperature of 220 °C. N3 was found to have a larger hyperbranched structure with a size of ∼19 μm formed with the “fractal growth rule”. There are many branches, and each branch is composed of a great number of naturally symmetrical nanocrystals in as seen in Figure 2 f.

Bottom Line: Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions.More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology.These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.

ABSTRACT
Uniformly sized and shape-controlled nanoparticles are important due to their applications in catalysis, electrochemistry, ion exchange, molecular adsorption, and electronics. Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions. Using controlled variations in the reaction conditions, such as reaction time, temperature, and amount of hexadecyltrimethylammonium bromide (CTAB), the crystals can be grown as almost perfect hyperbranched microcrystals at 180 °C (without CTAB) or relatively monodisperse particles at 220 °C (with CTAB). The large hyperbranched structure of Fe4(OH)3(PO4)3 with a size of ∼19 μm forms with the "fractal growth rule" and shows many branches. More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology. Interestingly, the blocking temperature (T B) shows a dependence on size and shape, and a smaller size resulted in a lower T B. These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.

No MeSH data available.


Related in: MedlinePlus