Accurate iron quantification in colloids and nanocomposites by a simple UV-Vis protocol

Torras, Miquel; Moya, Carlos; Pasquevich, G. A.; Roig, Anna

doi:10.1007/s00604-020-04454-w

Cited by 17 publications

(12 citation statements)

References 28 publications

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“…After the addition of 1 wt% BG powder, the pH value sharply increased to 7.0 and was even higher at 9.8 after addition of 20 wt% BG particles (Figure S1). Hence, the formation and precipitation of iron oxide can be expected under these conditions and the formation of hydroxide was indicated at the absorbance wavelength of 205 nm in the UV–Vis spectra, as shown in Figure S2 37 . However, alternate reactions may also occur in the presence of BG.…”

Section: Resultsmentioning

confidence: 92%

“…Hence, the formation and precipitation of iron oxide can be expected under these conditions and the formation of hydroxide was indicated at the absorbance wavelength of 205 nm in the UV-Vis spectra, as shown in Figure S2. 37 However, alternate reactions may also occur in the presence of BG.…”

Section: Reactor Characterization and Properties Of The Fe-edtabioact...mentioning

confidence: 99%

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Co‐doping of iron and copper ions in nanosized bioactive glass by reactive laser fragmentation in liquids

Ramesh

Bider

et al. 2022

J Biomedical Materials Res

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Bioactive glass (BG) is a frequently used biomaterial applicable in bone tissue engineering and known to be particularly effective when applied in nanoscopic dimensions. In this work, we employed the scalable reactive laser fragmentation in liquids method to produce nanosized 45S5 BG in the presence of light-absorbing Fe and Cu ions. Here, the function of the ions was twofold: (i) increasing the light absorption and thus causing a significant increase in laser fragmentation efficiency by a factor of 100 and (ii) doping the BG with bioactive metal ions up to 4 wt%. Our findings reveal an effective downsizing of the BG from micrometer-sized educts into nanoparticles having average diameters of <50 nm. This goes along with successful elementspecific incorporation of the metal ions into the BG, inducing co-doping of Fe and Cu ions as verified by energy-dispersive X-ray spectroscopy (EDX). In this context, the overall amorphous structure is retained, as evidenced by X-ray powder diffraction (XRD). We further demonstrate that the level of doping for both elements can be adjusted by changing the BG/ion concentration ratio during laser fragmentation.Consecutive ion release experiments using inductively-coupled plasma mass spectrometry (ICP-MS) were conducted to assess the potential bioactivity of the doped nanoscopic BG samples, and cell culture experiments using MG-63 osteoblast-like cells demonstrated their cytocompatibility. The elegant method of in situ co-doping of Fe and Cu ions during BG nanosizing may provide functionality-advanced biomaterials for future studies on angiogenesis or bone regeneration, particularly as the level of doping may be adjusted by ion concentrations and ion type in solution.bioactive ion doped bioglass, biocompatibility, biomaterials, bone tissue, engineering, laser doping | INTRODUCTION45S5 bioactive glass (BG) initially synthesized by Hench et al, 1 has advantages of controllable biodegradability, osteoconductivity and bioactivity. [2][3][4] BG can bind to bone tissue and stimulate bone regeneration by releasing Si 4+ , Ca 2+ , and PO 4 3À ions, 5 making it a successful bone graft. 6 To further enhance the dissolution, bioactivity, and protein-related bone therapeutics of BG, nanosized BG particle variants significantly increased in vitro

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Section: Resultsmentioning

confidence: 92%

Section: Reactor Characterization and Properties Of The Fe-edtabioact...mentioning

confidence: 99%

Co‐doping of iron and copper ions in nanosized bioactive glass by reactive laser fragmentation in liquids

Ramesh

Bider

et al. 2022

J Biomedical Materials Res

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“…Magnetization values were normalized by SPION mass, determined by a previously reported UV-vis quantification method. 33 …”

Section: Methodsmentioning

confidence: 99%

“…Magnetization values were normalized by SPION mass, determined by a previously reported UV-vis quantification method. 33 Morphology of the SPIONs were studied using transmission electron microscopy (TEM, JEOL JEM-1210) and cryogenic TEM (cryo-TEM, JEOL JEM-2011). Crystal orientation of the SPION clusters was analysed by high-resolution TEM (HRTEM, FEI Tecnai G2 F20 S-TWIN).…”

Section: Characterization Of Spionsmentioning

confidence: 99%

Riboflavin–citrate conjugate multicore SPIONs with enhanced magnetic responses and cellular uptake in breast cancer cells

et al. 2022

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“…For iron quantification, 2 mL of HNO 3 was added in 30 mg of sample containing NPs, the mixture was heated to 80 °C for 2 h and was then cooled down to room temperature, and 1 mL of H 2 O 2 was then added and the sample kept for another 2 h at 80 °C. The sample was subsequently filtered through a 0.2 μm porous filter and diluted in a 50 mL volumetric flask, as described by Torras et al 41 Magnetic Hyperthermia. All the details of the instrumentation used in the flowloop can be found in the Supporting Information.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Iron Oxide Nanoparticles in a Dynamic Flux: Implications for Magnetic Hyperthermia-Controlled Fluid Viscosity

Brollo

Pinheiro

Bassani³

et al. 2021

ACS Appl. Nano Mater.

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Magnetic hyperthermia (MH) is the phenomenon of increasing the temperature of a system with magnetic nanoparticles (NPs) subjected to an alternating magnetic field (AMF). This phenomenon occurs as the energy from the magnetic field is transformed into heat by mechanical (Brownian relaxation) and/or magnetic (Neél relaxation) magnetization reversal. In this work, we developed an experimental setup to test the use of MH for industrial applications. The liquid's viscosity decreases as the temperature increases, and liquids with high viscosity are present in several industries (e.g., O&G, pharmaceutical, chemical, and food), where a reduction in viscosity can translate into lower costs and greater profitability, for instance, in some industries, by decreasing the pressure drop and hence increasing the flow rate and in others by avoiding problems that occur at low temperature. Our pilot apparatus was built to investigate the hyperthermia effect when a mixture of viscous liquids and NPs, with an average size of 8 nm (transmission electron microscopy), flows through an AMF. In this study, three different configurations were tested, two static, with mixture samples of 1 and 100 mL, and one under dynamic flowing conditions. Two important results should be highlighted: (1) static experiments with 1 and 100 mL had similar SAR [W/g] values, demonstrating the viability of scaling up and (2) there was an increase in the temperature of the colloid flowing through the AMF. It was therefore possible to observe a clear increase in the liquid's temperature when subjected to an AMF, for all condition cases. The results suggest that this technology can be applied on an industrial scale by optimizing the coils and NP properties.

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Accurate iron quantification in colloids and nanocomposites by a simple UV-Vis protocol

Cited by 17 publications

References 28 publications

Co‐doping of iron and copper ions in nanosized bioactive glass by reactive laser fragmentation in liquids

Co‐doping of iron and copper ions in nanosized bioactive glass by reactive laser fragmentation in liquids

Riboflavin–citrate conjugate multicore SPIONs with enhanced magnetic responses and cellular uptake in breast cancer cells

Iron Oxide Nanoparticles in a Dynamic Flux: Implications for Magnetic Hyperthermia-Controlled Fluid Viscosity

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