Magnetism of Nanoparticles: Effect of the Organic Coating

Abdolrahimi, Maryam; Vasilakaki, Marianna; Slimani, Sawssen; Ntallis, Nikolaos; Varvaro, G.; Laureti, S.; Meneghini, Carlo; Trohidou, K. N.; Fiorani, D.; Peddis, Davide

doi:10.3390/nano11071787

Cited by 53 publications

(31 citation statements)

References 56 publications

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“…In contrast to other reports [ 57 ], another important aspect proven through this study by the VSM analysis is the capacity of the dextran coating to enhance the magnetic properties of the iron oxide nanocarriers. This effect could be explained through the reduction in the surface disorder generally responsible for significant changes in the magnetic properties of nanoparticles by the organic coating, which bonds with the surface cations and aligns the nanoparticle spins [ 58 ]. Moreover, the saturation values of the present nanostructures are similar to those obtained for superparamagnetic iron oxide nanoparticles, namely close to 60 emu/g [ 59 ].…”

Section: Discussionmentioning

confidence: 99%

Dextran-Coated Iron Oxide Nanoparticles Loaded with Curcumin for Antimicrobial Therapies

et al. 2022

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The current trend in antimicrobial-agent development focuses on the use of natural compounds that limit the toxicity of conventional drugs and provide a potential solution to the antimicrobial resistance crisis. Curcumin represents a natural bioactive compound with well-known antimicrobial, anticancer, and antioxidant properties. However, its hydrophobicity considerably limits the possibility of body administration. Therefore, dextran-coated iron oxide nanoparticles can be used as efficient drug-delivery supports that could overcome this limitation. The iron oxide nanoparticles were synthesized through the microwave-assisted hydrothermal method by varying the treatment parameters (pressure and reaction time). The nanoparticles were subsequently coated with dextran and used for the loading of curcumin (in various concentrations). The drug-delivery systems were characterized through X-ray diffraction (XRD) coupled with Rietveld refinement, transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), selected area electron diffraction (SAED), dynamic light scattering (DLS) and zeta potential, thermogravimetry and differential scanning calorimetry (TG-DSC), vibrating sample magnetometry (VSM), and UV-Vis spectrophotometry, as well as regarding their antimicrobial efficiency and biocompatibility using the appropriate assays. The results demonstrate a promising antimicrobial efficiency, as well as an increased possibility of controlling the properties of the resulted nanosystems. Thus, the present study represents an important step forward toward the development of highly efficient antimicrobial drug-delivery systems.

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Section: Discussionmentioning

confidence: 99%

Dextran-Coated Iron Oxide Nanoparticles Loaded with Curcumin for Antimicrobial Therapies

et al. 2022

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“…M s of the alkanethiol adsorbed iron particles did not change significantly relative to pure iron (2.4 × 10 05 memu/g), although the M s values of all alkanethiol adsorbed iron particles were lower than that of pure iron. The decrease in the M s value of alkanethiol adsorbed iron particles can be attributed to the surface coverage of iron with alkanethiol molecules causing a thinning of the magnetic shell . However, it was observed that there was a greater decrease (approximately between 0.6% and 0.8%) in M s for the hexadecanethiol + IPA and hexadecanethiol + chloroform systems relative to all other samples (0.2–0.4%), as shown in Figure c and d, respectively.…”

Section: Resultsmentioning

confidence: 82%

“…The decrease in the M s value of alkanethiol adsorbed iron particles can be attributed to the surface coverage of iron with alkanethiol molecules causing a thinning of the magnetic shell. 110 However, it was observed that there was a greater decrease (approximately between 0.6% and 0.8%) in M s for the hexadecanethiol + IPA and hexadecanethiol + chloroform systems relative to all other samples (0.2−0.4%), as shown in Figure 4c and d, respectively.…”

Section: Adsorption Behaviormentioning

confidence: 82%

Study ofn-Alkanethiol Self-Assembly Behavior on Iron Particles: Effect of Alkyl Chain Length and Adsorption Solvent on Resulting Iron-Based Magnetorheological Fluids

et al. 2022

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Self-assembled monolayers (SAMs) of organic molecules on metal surfaces are a type of inexpensive surface coating often used to improve metal substrate properties for sensors, electrochemistry, and nanofabrication applications. Iron, specifically, is one of the most commonly used metals, both as a pure metal and as an alloy due to its high conductivity, strong ferromagnetism, and low cost. However, magnetorheological fluids, which have shown impressive energy dampening in fields from civil infrastructure to biomedical devices utilizing iron dispersions, have suffered from low reliability and efficiency due to iron particle oxidation, corrosion, and settling. To understand the effect of self-assembled monolayers on iron and both the adsorbed particle's resistance against aggregation and performance impact, this work performs an in-depth study on alkanethiol-based self-assembled monolayers on iron particles. Adsorption of alkanethiols and the generation of SAMs on micronsized iron particles were evaluated as a function of adsorption solvent polarity and alkanethiol chain length. Maximum alkanethiol loading, determined from appropriate isotherms, was found to strongly be a function of both parameters. Alkanethiol adsorption increased with increasing alkyl chain length and increasing solvent log P values in polar solvents. With respect to magnetorheologically relevant parameters, alkanethiol adsorption did not show any significant effect on both the magnetic properties of iron (as particles) and fluid on-state yield stress. The colloidal stability of n-alkanethiol adsorbed iron-based magnetorheological fluids (MRFs) was a function of both n-alkanethiol chain length and the iron particle adsorption solvent. MRFs composed of hexadecanethiol adsorbed iron prepared in polar solvents like methanol and ethanol showed excellent sedimentation stability compared to all other MRFs prepared in this study.

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“…The technological demand for biodegradable and ecological nanostructured materials has promoted long ago the effective strategy of the coverage of the surface of magnetic nanoparticles (MNPs), during or aer their preparation, with an organic coating material. 1 There is a large number of studied coating materials nowadays which allow the control of the strength of the interparticle interactions and the degree of colloidal stability in liquid carriers. 2 It has also been demonstrated [3][4][5][6][7][8][9][10][11][12] that these materials can modify the intra-particle characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%