Susceptibility of cobalt ferrite nanoparticles dispersed in polylactic acid microspheres

Silveira, L. B.; Santos, J. G.; Oliveira, A. C.; Tedesco, Antônio Cláudio; Marchetti, Juliana Maldonado; Lima, E.C.D.; Morais, P.C.

doi:10.1016/j.jmmm.2003.12.435

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…It can be confirmed from Figure 1 [22] The frequency red shift of A 1g (1) peak implies the elongation of Fe-O bond. In other words, the strain is induced with the doping of Mg.…”

Section: Characterization Of the Catalystssupporting

confidence: 54%

Highly Efficient Epoxidation of Cyclopentene Catalyzed by Magnetically Recoverable Mg-doped Cobalt Ferrites with Greatly Improved Performances

Liu

Wang

et al. 2016

ChemistrySelect

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The alkaline earth metal Mg-doped CoFe 2 O 4 composite ferrite samples Mg x Co 1-x Fe 2 O 4 (x = 0, 0.1, 0.3, 0.5, 0.7 and 1) were prepared using a sol-gel auto-combustion route. The asprepared samples were characterized by Raman spectrometry, X-ray diffractometry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), ICP-atomic emission spectroscopy and N 2 -physisorption. The catalytic activities of the samples were tested in the cyclopentene oxidation using hydrogen peroxide (30 %) as the oxidant. Compared with the pristine CoFe 2 O 4 and MgFe 2 O 4 , the MgÀCo composite ferrites showed much enhanced catalytic performances in the oxidation of cyclopentene with cyclopentene oxide as the main product. In particular, 95.2 % of cyclopentene conversion and 96.3 % of selectivity for cyclopentene oxide were achieved when Mg 0.5 Co 0.5 Fe 2 O 4 was used at 60 o C for 8 h in the oxidation reaction. The catalyst can be easily separated by applying magnetic field and exhibits great reusability.

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“…It can be confirmed from Figure 1 [22] The frequency red shift of A 1g (1) peak implies the elongation of Fe-O bond. In other words, the strain is induced with the doping of Mg.…”

Section: Characterization Of the Catalystssupporting

confidence: 54%

Highly Efficient Epoxidation of Cyclopentene Catalyzed by Magnetically Recoverable Mg-doped Cobalt Ferrites with Greatly Improved Performances

Liu

Wang

et al. 2016

ChemistrySelect

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“…The potential for application of neat or composite PLLA microspheres has been demonstrated in the treatment of ocular pathologies, namely in regenerative medicine for retinal repair or related intraocular pathologies [14] and drug delivery [7,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Processing and size range separation of pristine and magnetic poly( l -lactic acid) based microspheres for biomedical applications

Correia

Sencadas

Ribeiro

et al. 2016

Journal of Colloid and Interface Science

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Biodegradable poly(l-lactic acid) (PLLA) and PLLA/CoFe2O4 magnetic microspheres with average sizes ranging between 0.16-3.9μm and 0.8-2.2μm, respectively, were obtained by an oil-in-water emulsion method using poly(vinyl alcohol) (PVA) solution as the emulsifier agent. The separation of the microspheres in different size ranges was then performed by centrifugation and the colloidal stability assessed at different pH values. Neat PLLA spheres are more stable in alkaline environments when compared to magnetic microspheres, both types being stable for pHs higher than 4, resulting in a colloidal suspension. On the other hand, in acidic environments the microspheres tend to form aggregates. The neat PLLA microspheres show a degree of crystallinity of 40% whereas the composite ones are nearly amorphous (17%). Finally, the biocompatibility was assessed by cell viability studies with MC3T3-E1 pre-osteoblast cells.

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“…The nanoparticles possess great potentials for application in catalysis, gas sensors, high quality ceramics and super paramagnetic materials [2][3][4][5]. The properties of these materials mainly depend on their shape, size, and structure, which are strongly determined by the synthetic processes.…”

Section: Introductionmentioning

confidence: 99%

Glycine-assisted fabrication of nanocrystalline cobalt ferrite system

Deraz

2010

Journal of Analytical and Applied Pyrolysis

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Susceptibility of cobalt ferrite nanoparticles dispersed in polylactic acid microspheres

Cited by 12 publications

References 8 publications

Highly Efficient Epoxidation of Cyclopentene Catalyzed by Magnetically Recoverable Mg-doped Cobalt Ferrites with Greatly Improved Performances

Highly Efficient Epoxidation of Cyclopentene Catalyzed by Magnetically Recoverable Mg-doped Cobalt Ferrites with Greatly Improved Performances

Processing and size range separation of pristine and magnetic poly( l -lactic acid) based microspheres for biomedical applications

Glycine-assisted fabrication of nanocrystalline cobalt ferrite system

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