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Prolate spheroidal hematite particles equatorially belt with drug-carrying layered double hydroxide disks: Ring Nebula-like nanocomposites.

Nedim Ay A, Konuk D, Zümreoglu-Karan B - Nanoscale Res Lett (2011)

Bottom Line: Spindle-shaped hematite nanoparticles with average length of 225 nm and width of 75 nm were obtained by thermal decomposition of hydrothermally synthesized hematite.The particles were first coated with Mg-Al-NO3-LDH shell and then subjected to anion exchange with salicylate ions.The resulting bio-nanohybrid displayed a close structural resemblance to that of the Ring Nebula.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, Hacettepe University, Beytepe Campus, 06800 Ankara, Turkey. bkaran@hacettepe.edu.tr.

ABSTRACT
A new nanocomposite architecture is reported which combines prolate spheroidal hematite nanoparticles with drug-carrying layered double hydroxide [LDH] disks in a single structure. Spindle-shaped hematite nanoparticles with average length of 225 nm and width of 75 nm were obtained by thermal decomposition of hydrothermally synthesized hematite. The particles were first coated with Mg-Al-NO3-LDH shell and then subjected to anion exchange with salicylate ions. The resulting bio-nanohybrid displayed a close structural resemblance to that of the Ring Nebula. Scanning electron microscope and transmission electron microscopy images showed that the LDH disks are stacked around the equatorial part of the ellipsoid extending along the main axis. This geometry possesses great structural tunability as the composition of the LDH and the nature of the interlayer region can be tailored and lead to novel applications in areas ranging from functional materials to medicine by encapsulating various guest molecules.

No MeSH data available.


Related in: MedlinePlus

Room temperature magnetization curves of uncoated and coated hematite particles. Uncoated (A), NO3-LDH-coated (B), and SAL-LDH-coated hematite (C).
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Figure 3: Room temperature magnetization curves of uncoated and coated hematite particles. Uncoated (A), NO3-LDH-coated (B), and SAL-LDH-coated hematite (C).

Mentions: Figure 3 shows the room temperature magnetization curves of uncoated and coated hematite particles. The observed narrow hysteresis loops (shown in the inset) with small coercivity and remanence magnetization behavior are characteristics of a soft ferromagnet [25]. The measured saturation magnetization values for α-Fe2O3@NO3-LDH (0.7 emu/g) and α-Fe2O3@SAL-LDH (0.6 emu/g) were lower than that of the naked hematite (9.6 emu/g). The decreased saturation magnetization should be attributed to the presence of the nonmagnetic material around the magnetic core and is related to the amount of the shell. α-Fe2O3@SAL-LDH was formulated as Fe2O3@4{Mg0.68Al0.32(OH)2(C7H5O3)0.31(NO3)0.010.6H2O} using the chemical and thermogravimetric analysis data. The core content of the nanocomposite is 26 wt.% and the drug content 28 wt.%.


Prolate spheroidal hematite particles equatorially belt with drug-carrying layered double hydroxide disks: Ring Nebula-like nanocomposites.

Nedim Ay A, Konuk D, Zümreoglu-Karan B - Nanoscale Res Lett (2011)

Room temperature magnetization curves of uncoated and coated hematite particles. Uncoated (A), NO3-LDH-coated (B), and SAL-LDH-coated hematite (C).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211161&req=5

Figure 3: Room temperature magnetization curves of uncoated and coated hematite particles. Uncoated (A), NO3-LDH-coated (B), and SAL-LDH-coated hematite (C).
Mentions: Figure 3 shows the room temperature magnetization curves of uncoated and coated hematite particles. The observed narrow hysteresis loops (shown in the inset) with small coercivity and remanence magnetization behavior are characteristics of a soft ferromagnet [25]. The measured saturation magnetization values for α-Fe2O3@NO3-LDH (0.7 emu/g) and α-Fe2O3@SAL-LDH (0.6 emu/g) were lower than that of the naked hematite (9.6 emu/g). The decreased saturation magnetization should be attributed to the presence of the nonmagnetic material around the magnetic core and is related to the amount of the shell. α-Fe2O3@SAL-LDH was formulated as Fe2O3@4{Mg0.68Al0.32(OH)2(C7H5O3)0.31(NO3)0.010.6H2O} using the chemical and thermogravimetric analysis data. The core content of the nanocomposite is 26 wt.% and the drug content 28 wt.%.

Bottom Line: Spindle-shaped hematite nanoparticles with average length of 225 nm and width of 75 nm were obtained by thermal decomposition of hydrothermally synthesized hematite.The particles were first coated with Mg-Al-NO3-LDH shell and then subjected to anion exchange with salicylate ions.The resulting bio-nanohybrid displayed a close structural resemblance to that of the Ring Nebula.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, Hacettepe University, Beytepe Campus, 06800 Ankara, Turkey. bkaran@hacettepe.edu.tr.

ABSTRACT
A new nanocomposite architecture is reported which combines prolate spheroidal hematite nanoparticles with drug-carrying layered double hydroxide [LDH] disks in a single structure. Spindle-shaped hematite nanoparticles with average length of 225 nm and width of 75 nm were obtained by thermal decomposition of hydrothermally synthesized hematite. The particles were first coated with Mg-Al-NO3-LDH shell and then subjected to anion exchange with salicylate ions. The resulting bio-nanohybrid displayed a close structural resemblance to that of the Ring Nebula. Scanning electron microscope and transmission electron microscopy images showed that the LDH disks are stacked around the equatorial part of the ellipsoid extending along the main axis. This geometry possesses great structural tunability as the composition of the LDH and the nature of the interlayer region can be tailored and lead to novel applications in areas ranging from functional materials to medicine by encapsulating various guest molecules.

No MeSH data available.


Related in: MedlinePlus