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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.

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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.

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Powder X-ray diffraction patterns, SEM and TEM images of the as-prepared samples. XRD patterns of uncoated, NO3-LDH-coated, and SAL-LDH-coated hematite (A). SEM images of uncoated (B) and SAL-LDH-coated hematite (C). TEM images of uncoated (D) and SAL-LDH-coated hematite (E). SAED pattern of SAL-LDH-coated hematite (F).
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Figure 1: Powder X-ray diffraction patterns, SEM and TEM images of the as-prepared samples. XRD patterns of uncoated, NO3-LDH-coated, and SAL-LDH-coated hematite (A). SEM images of uncoated (B) and SAL-LDH-coated hematite (C). TEM images of uncoated (D) and SAL-LDH-coated hematite (E). SAED pattern of SAL-LDH-coated hematite (F).

Mentions: Figure 1a shows the powder X-ray diffraction pattern of the as-prepared hematite sample. The pattern indicates single phase of α-Fe2O3 with characteristic sharp reflections at d values of 3.66 Å (012), 2.69 Å (104), 2.51 Å (110), 2.20 Å (113), 1.83 Å (024), 1.69 Å (116), 1.48 Å (214), and 1.45 Å (300), matching with the JCPDS file 13-534. The FTIR spectrum confirmed the hematite structure with two characteristic bands located at 547 and 478 cm-1 [23]. TEM and SEM images of the as-synthesized hematite nanoparticles showed a well-defined spindle morphology with a mean edge length in the range from 200 to 220 nm and edge width from 70 to 80 nm; the length-to-width ratio is about 3 (Figure 1B-E).


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)

Powder X-ray diffraction patterns, SEM and TEM images of the as-prepared samples. XRD patterns of uncoated, NO3-LDH-coated, and SAL-LDH-coated hematite (A). SEM images of uncoated (B) and SAL-LDH-coated hematite (C). TEM images of uncoated (D) and SAL-LDH-coated hematite (E). SAED pattern of SAL-LDH-coated hematite (F).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Powder X-ray diffraction patterns, SEM and TEM images of the as-prepared samples. XRD patterns of uncoated, NO3-LDH-coated, and SAL-LDH-coated hematite (A). SEM images of uncoated (B) and SAL-LDH-coated hematite (C). TEM images of uncoated (D) and SAL-LDH-coated hematite (E). SAED pattern of SAL-LDH-coated hematite (F).
Mentions: Figure 1a shows the powder X-ray diffraction pattern of the as-prepared hematite sample. The pattern indicates single phase of α-Fe2O3 with characteristic sharp reflections at d values of 3.66 Å (012), 2.69 Å (104), 2.51 Å (110), 2.20 Å (113), 1.83 Å (024), 1.69 Å (116), 1.48 Å (214), and 1.45 Å (300), matching with the JCPDS file 13-534. The FTIR spectrum confirmed the hematite structure with two characteristic bands located at 547 and 478 cm-1 [23]. TEM and SEM images of the as-synthesized hematite nanoparticles showed a well-defined spindle morphology with a mean edge length in the range from 200 to 220 nm and edge width from 70 to 80 nm; the length-to-width ratio is about 3 (Figure 1B-E).

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