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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, Z├╝mreoglu-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

Effect of LDH coating on the optical properties of hematite core. Diffuse reflectance UV/Vis spectra of uncoated hematite (A), NO3-LDH-coated hematite (LDH peak at 218 nm) (B), and SAL-LDH-coated hematite (LDH and SAL peaks at 224, 240, and 319 nm) (C).
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Figure 4: Effect of LDH coating on the optical properties of hematite core. Diffuse reflectance UV/Vis spectra of uncoated hematite (A), NO3-LDH-coated hematite (LDH peak at 218 nm) (B), and SAL-LDH-coated hematite (LDH and SAL peaks at 224, 240, and 319 nm) (C).

Mentions: The effect of LDH coating on the optical properties of the hematite core is illustrated in Figure 4. Related to the change in morphology, ligand-to-metal charge transfer transition of the uncoated spindle hematite at 358 nm showed a red shift, while the shoulder due to the ligand field transition around 520 nm did not shift. This typical behavior for anisotropic hematite agrees with recent reports [26,27].


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

Nedim Ay A, Konuk D, Z├╝mreoglu-Karan B - Nanoscale Res Lett (2011)

Effect of LDH coating on the optical properties of hematite core. Diffuse reflectance UV/Vis spectra of uncoated hematite (A), NO3-LDH-coated hematite (LDH peak at 218 nm) (B), and SAL-LDH-coated hematite (LDH and SAL peaks at 224, 240, and 319 nm) (C).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Effect of LDH coating on the optical properties of hematite core. Diffuse reflectance UV/Vis spectra of uncoated hematite (A), NO3-LDH-coated hematite (LDH peak at 218 nm) (B), and SAL-LDH-coated hematite (LDH and SAL peaks at 224, 240, and 319 nm) (C).
Mentions: The effect of LDH coating on the optical properties of the hematite core is illustrated in Figure 4. Related to the change in morphology, ligand-to-metal charge transfer transition of the uncoated spindle hematite at 358 nm showed a red shift, while the shoulder due to the ligand field transition around 520 nm did not shift. This typical behavior for anisotropic hematite agrees with recent reports [26,27].

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