Enhanced stability and dechlorination activity of pre-synthesis stabilized nanoscale FePd particles

Sakulchaicharoen, Nataphan; O'Carroll, D. M.; Herrera, José E.

doi:10.1016/j.jconhyd.2010.09.004

Cited by 175 publications

(120 citation statements)

References 27 publications

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“…These particles were obtained from a more stable emulsion produced with cosurfactant and ultrasonication addition, which originated nanodroplets during emulsification. Small particles are known to dramatically enhance Brownian motion, which further prevents particle aggregation, offers increased stability, 72 and justifies the lower tendency of cosurfactant and ultrasonication-assisted particles to aggregate compared to single surfactant-assisted particles. Particles of Figure 5A have a more porous texture, contrary to particles of Figure 5B, probably because during the recovery step they lost a significant amount of water during centrifugation, leading to a change of the polymeric structure.…”

Section: Morphological Analysismentioning

confidence: 99%

Probing insulin bioactivity in oral nanoparticles produced by ultrasonication-assisted emulsification/internal gelation

Lopes¹,

Abrahim-Vieira²,

Oliveira³

et al. 2015

IJN

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Alginate–dextran sulfate-based particles obtained by emulsification/internal gelation technology can be considered suitable carriers for oral insulin delivery. A rational study focused on the emulsification and particle recovery steps was developed in order to reduce particles to the nanosize range while keeping insulin bioactivity. There was a decrease in size when ultrasonication was used during emulsification, which was more pronounced when a cosurfactant was added. Ultrasonication add-on after particle recovery decreased aggregation and led to a narrower nanoscale particle-size distribution. Insulin encapsulation efficiency was 99.3%±0.5%, attributed to the strong pH-stabilizing electrostatic effect between insulin and nanoparticle matrix polymers. Interactions between these polymers and insulin were predicted using molecular modeling studies through quantum mechanics calculations that allowed for prediction of the interaction model. In vitro release studies indicated well-preserved integrity of nanoparticles in simulated gastric fluid. Circular dichroism spectroscopy proved conformational stability of insulin and Fourier transform infrared spectroscopy technique showed rearrangements of insulin structure during processing. Moreover, in vivo biological activity in diabetic rats revealed no statistical difference when compared to nonencapsulated insulin, demonstrating retention of insulin activity. Our results demonstrate that alginate–dextran sulfate-based nanoparticles efficiently stabilize the loaded protein structure, presenting good physical properties for oral delivery of insulin.

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Section: Morphological Analysismentioning

confidence: 99%

Probing insulin bioactivity in oral nanoparticles produced by ultrasonication-assisted emulsification/internal gelation

Lopes¹,

Abrahim-Vieira²,

Oliveira³

et al. 2015

IJN

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“…Glass slides have a higher water wettability than Al foils [34,35] but a much lower thermal conductivity. The macromolecules of PVP are known to immobilize iron ions by weak interactions [36] or steric hindrance [37] acting as nanoreactors for the synthesis of nanoparticles by forming stable metal clusters [38]. Thus, when the PVP-metal ions solution hit the glass electrode, it spread more than in the Al foil forming flatter and thinner fibers (as shown in Figure 2b), which, after sintering formed an inter-connected structure (nanofibers linked by a veil).…”

Section: Morphology Of the Thermal Treated Samplesmentioning

confidence: 99%

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Melo¹,

Santos²,

Gualdi³

et al. 2017

Electrospinning

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BiFeO 3 nanofibers of different morphologies and dimensions were produced by electrospinning varying the collector and thermal treatment. By thermogravimetric analyses (TGA) the thermal behavior of the as-spun nanofibers was studied. The morphology of the nanofibers was examined by transmission and scanning electron microscopy (TEM and SEM, respectively) while the chemical composition and crystal structure were analyzed by energy dispersive x-ray spectrometry (EDS) and wide angle x-ray diffraction (WAXD). A vibrating sample magnetometer (VSM) was used to evaluate the magnetic properties. Different types of mats with different nanofibers´dimen-sions were obtained; while some nanofibers were interconnected, others were completely separated and aligned. The thinnest nanofibers were obtained using an aluminum substrate with folds and after annealing at 550 ∘ C. All samples annealed at this temperature formed pure BiFeO 3 , while samples annealed at 550 and 750 ∘ C formed an additional Bi 2 Fe 4 O 9 phase. No iron impurities were detected; the crystallite size of all the nanofibers was between 30 and 36 nm. The saturation magnetization increased with the decrease of the nanofiber´s diameter and increase of nanofibers interconnectivity. Thus, this ferromagnetism behavior was attributed to the suppression of the spiral spin structure of BiFeO 3 (which has a 62 nm period) and to the morphology of interconnected nanofibers.

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“…Moreover, surface modification of nZVI has been intentionally performed, in order to enhance nZVI properties desirable for environmental remediation. In order to prevent aggregation for in situ subsurface remediation, particle stabilization or nZVI immobilization on various support materials has been achieved in many studies [8,9]. Recently, remarkable enhancement of stability and reactivity was reported by applying an organo-functionalized clay, i.e.…”

Section: Introductionmentioning

confidence: 99%

Graduated characterization method using a multi-well microplate for reducing reactivity of nanoscale zero valent iron materials

Hwang

Salatas

Mines

et al. 2016

Applied Catalysis B: Environmental

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Enhanced stability and dechlorination activity of pre-synthesis stabilized nanoscale FePd particles

Cited by 175 publications

References 27 publications

Probing insulin bioactivity in oral nanoparticles produced by ultrasonication-assisted emulsification/internal gelation

Probing insulin bioactivity in oral nanoparticles produced by ultrasonication-assisted emulsification/internal gelation

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Graduated characterization method using a multi-well microplate for reducing reactivity of nanoscale zero valent iron materials

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