Iron Oxide Materials Produced by Laser Pyrolysis

Alexandrescu, R.; Bello, Valentina; Bouzas, V.; Costo, R.; Dumitrache, F.; García, María Ángel; Giorgi, R.; Morales, M.P.; Morjan, I.; Serna, C. J.; Veintemillas‐Verdaguer, S.

doi:10.1063/1.3505075

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The photopolymer (Ormocore) and the developer (Ormodev) were purchased from Micro resist technology GmbH (Berlin, Germany). The superparamagnetic nanoparticles with 4.9 ± 1.5 nm diameters and maghemite structure (gamma–Fe 2 O 3 ) were produced by laser pyrolysis in identical experimental conditions as those reported in [33]. The laser pyrolysis technique relies on the laser-driven heating of an iron precursor in vapor phase in presence of oxygen [33,34].…”

Section: Methodsmentioning

confidence: 99%

“…The superparamagnetic nanoparticles with 4.9 ± 1.5 nm diameters and maghemite structure (gamma–Fe 2 O 3 ) were produced by laser pyrolysis in identical experimental conditions as those reported in [33]. The laser pyrolysis technique relies on the laser-driven heating of an iron precursor in vapor phase in presence of oxygen [33,34]. The experimental parameters used for producing the MNPs used in this study are reported in [33]: laser power (CO 2 laser) 55 W, beam diameter 1.5 mm, Fe(CO) 5 flux 19 sccm, carrier gas flux 100 C 2 H 4 + 70 Air sccm, productivity about 3.3 g/h.…”

Section: Methodsmentioning

confidence: 99%

“…The laser pyrolysis technique relies on the laser-driven heating of an iron precursor in vapor phase in presence of oxygen [33,34]. The experimental parameters used for producing the MNPs used in this study are reported in [33]: laser power (CO 2 laser) 55 W, beam diameter 1.5 mm, Fe(CO) 5 flux 19 sccm, carrier gas flux 100 C 2 H 4 + 70 Air sccm, productivity about 3.3 g/h. The saturation magnetization was 30 emu/g at room temperature, as determined by [34].…”

Section: Methodsmentioning

confidence: 99%

“…The scaffolds were fabricated from photopolymer/MNPs composites by laser direct writing via two photons polymerization (LDW via TPP) and tested in respect with osteogenic potential [33,34,35,36,37]. The photopolymer Ormocore was employed as 3D structurable material because of its biocompatibility and suitability for bone tissue engineering [38,39].…”

Section: Introductionmentioning

confidence: 99%

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3D Superparamagnetic Scaffolds for Bone Mineralization under Static Magnetic Field Stimulation

et al. 2019

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We reported on three-dimensional (3D) superparamagnetic scaffolds that enhanced the mineralization of magnetic nanoparticle-free osteoblast cells. The scaffolds were fabricated with submicronic resolution by laser direct writing via two photons polymerization of Ormocore/magnetic nanoparticles (MNPs) composites and possessed complex and reproducible architectures. MNPs with a diameter of 4.9 ± 1.5 nm and saturation magnetization of 30 emu/g were added to Ormocore, in concentrations of 0, 2 and 4 mg/mL. The homogenous distribution and the concentration of the MNPs from the unpolymerized Ormocore/MNPs composite were preserved after the photopolymerization process. The MNPs in the scaffolds retained their superparamagnetic behavior. The specific magnetizations of the scaffolds with 2 and 4 mg/mL MNPs concentrations were of 14 emu/g and 17 emu/g, respectively. The MNPs reduced the shrinkage of the structures from 80.2 ± 5.3% for scaffolds without MNPs to 20.7 ± 4.7% for scaffolds with 4 mg/mL MNPs. Osteoblast cells seeded on scaffolds exposed to static magnetic field of 1.3 T deformed the regular architecture of the scaffolds and evoked faster mineralization in comparison to unstimulated samples. Scaffolds deformation and extracellular matrix mineralization under static magnetic field (SMF) exposure increased with increasing MNPs concentration. The results are discussed in the frame of gradient magnetic fields of ~3 × 10−4 T/m generated by MNPs over the cells bodies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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3D Superparamagnetic Scaffolds for Bone Mineralization under Static Magnetic Field Stimulation

et al. 2019

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“…The unpolymerized Ormocore/MNPs composite was homogenized by 1000 W ultrasonicator at 20 kHz (Hielscher Ultrasonics GmbH, Model UIP1000hdT) for 30 s. The superparamagnetic nanoparticles with 4.9 ± 1.5 nm diameters and maghemite structure (gamma-Fe 2 O 3 ) were produced by laser pyrolysis as described in 42 , 43 . The MNPs from the polymerized Ormocore/MNPs composite preserved their superparamagnetic behavior and had a specific magnetization of about 17 emu/g 30 .…”

Section: Methodsmentioning

confidence: 99%

Magnetically-driven 2D cells organization on superparamagnetic micromagnets fabricated by laser direct writing

Păun

Mustăciosu

Mihăilescu

et al. 2020

Sci Rep

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We demonstrate a proof of concept for magnetically-driven 2D cells organization on superparamagnetic micromagnets fabricated by laser direct writing via two photon polymerization (LDW via TPP) of a photopolymerizable superparamagnetic composite. The composite consisted of a commercially available, biocompatible photopolymer (Ormocore) mixed with 4 mg/mL superparamagnetic nanoparticles (MNPs). The micromagnets were designed in the shape of squares with 70 µm lateral dimension. To minimize the role of topographical cues on the cellular attachment, we fabricated 2D microarrays similar with a chessboard: the superparamagnetic micromagnets alternated with non-magnetic areas of identical shape and lateral size as the micromagnets, made from Ormocore by LDW via TPP. The height difference between the superparamagnetic and non-magnetic areas was of ~ 6 µm. In the absence of a static magnetic field, MNPs-free fibroblasts attached uniformly on the entire 2D microarray, with no preference for the superparamagnetic or non-magnetic areas. Under a static magnetic field of 1.3 T, the fibroblasts attached exclusively on the superparamagnetic micromagnets, resulting a precise 2D cell organization on the chessboard-like microarray. The described method has significant potential for fabricating biocompatible micromagnets with well-defined geometries for building skin grafts adapted for optimum tissue integration, starting from single cell manipulation up to the engineering of whole tissues.

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Chimeric nanocomposites for the rapid and simple isolation of urinary extracellular vesicles

Dao

Kim

Koo

et al. 2022

J of Extracellular Vesicle

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Cancer cell‐derived extracellular vesicles (EVs) are promising biomarkers for cancer diagnosis and prognosis. However, the lack of rapid and sensitive isolation techniques to obtain EVs from clinical samples at a sufficiently high yield limits their practicability. Chimeric nanocomposites of lactoferrin conjugated 2,2‐bis(methylol)propionic acid dendrimer‐modified magnetic nanoparticles (LF‐bis‐MPA‐MNPs) are fabricated and used for simple and sensitive EV isolation from various biological samples via a combination of electrostatic interaction, physically absorption, and biorecognition between the surfaces of the EVs and the LF‐bis‐MPA‐MNPs. The speed, efficiency, recovery rate, and purity of EV isolation by the LF‐bis‐MPA‐MNPs are superior to those obtained by using established methods. The relative expressions of exosomal microRNAs (miRNAs) from isolated EVs in cancerous cell‐derived exosomes are verified as significantly higher than those from noncancerous ones. Finally, the chimeric nanocomposites are used to assess urinary exosomal miRNAs from urine specimens from 20 prostate cancer (PCa), 10 benign prostatic hyperplasia (BPH), patients and 10 healthy controls. Significant up‐regulation of miR‐21 and miR‐346 and down‐regulation of miR‐23a and miR‐122‐5p occurs in both groups compared to healthy controls. LF‐bis‐MPA‐MNPs provide a rapid, simple, and high yield method for human excreta analysis in clinical applications.

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Iron Oxide Materials Produced by Laser Pyrolysis

Cited by 4 publications

References 2 publications

3D Superparamagnetic Scaffolds for Bone Mineralization under Static Magnetic Field Stimulation

3D Superparamagnetic Scaffolds for Bone Mineralization under Static Magnetic Field Stimulation

Magnetically-driven 2D cells organization on superparamagnetic micromagnets fabricated by laser direct writing

Chimeric nanocomposites for the rapid and simple isolation of urinary extracellular vesicles

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