Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Sanz, Beatriz; Calatayud, M. Pilar; Cassinelli, N.; Ibarra, M. R.; Goya, Gerardo F.

doi:10.1002/ejic.201500303

Cited by 37 publications

(28 citation statements)

References 47 publications

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“…Magnetization data for poly acrylic acid (sodium salt)-coated γFe 2 O 3 nanoparticles have been previously reported in the literature [38]. Our experimental measurements were in agreement of the reported value of 3.5 × 10 5 Am − 1 .…”

Section: Characterization Of Psa-mnpssupporting

confidence: 93%

“…The stability and resilience of the poly acrylic acid coating have been previously indicated by Fresnais et al [38]. In their work, the authors demonstrated that poly acrylic acid (in its sodium salt form), constitutes a resilient adlayer onto the surface of γ-Fe 2 O 3 nanoparticles which make them suitable for water treatment applications such as for applications in pollutant removal.…”

Section: Osmotic Pressure and Fo Water Flux Of Psa And Psa-mnpsmentioning

confidence: 88%

“…A higher polymer coverage would mean more hydrophilic groups translating into higher osmotic pressure, as well as, causing a steric hindrance and reducing chances of aggregation even after regeneration -a problem that has been reported [29]. The steric hindrance due to the polymer helps maintaining the MNPs in suspension and hinders agglomeration [37,38]. Even after the magnet-assisted separation, the agglomeration formed was easily broken and the MNPs can be re-dispersed in a short time.…”

Section: Synthesis Of Psa Coated Mnp Smdas (Psa-mnps)mentioning

confidence: 92%

“…Since the purification steps did not affect or strip-off the polymer from the MNP surface, we can safely comment that the polymer adhesion was both stable and of good quality. In addition, Fresnais et al [38] have also demonstrated that poly acrylic acidcoated γFe 2 O 3 nanoparticles remained stable from pH 10 down to pH 3.5 and did not agglomerate.…”

Section: Characterization Of Psa-mnpsmentioning

confidence: 95%

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Magnetic nanoparticles boosting the osmotic efficiency of a polymeric FO draw agent: Effect of polymer conformation

Dey

Izake

2015

Desalination

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Section: Characterization Of Psa-mnpssupporting

confidence: 93%

Section: Osmotic Pressure and Fo Water Flux Of Psa And Psa-mnpsmentioning

confidence: 88%

Section: Synthesis Of Psa Coated Mnp Smdas (Psa-mnps)mentioning

confidence: 92%

Section: Characterization Of Psa-mnpsmentioning

confidence: 95%

See 2 more Smart Citations

Magnetic nanoparticles boosting the osmotic efficiency of a polymeric FO draw agent: Effect of polymer conformation

Dey

Izake

2015

Desalination

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“…When exposed to an external magnetic field the dispersion moves towards it due to the magnetic attraction of the SPION, without present any phase separation ( figure 6(b)). These results demonstrate the Mag-PEG-FA SPION present properties that allow its use in protocols of MFH [36].…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 62%

PEGlatyon-SPION surface functionalization with folic acid for magnetic hyperthermia applications

Piazza

Viali

Santos

et al. 2020

Mater. Res. Express

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Superparamagnetic iron oxide nanoparticles (SPION) are of great interest for application in magnetic fluid hyperthermia (MFH) due to their heat generation capability in an external alternating magnetic field, besides biocompatibility, and surface properties. MFH has emerged as a promisor therapeutic approach for cancer treatment and is based in controlled heating tumor tissue through the accumulation of SPIONs within cancer cells. This work describes a new route for the preparation of folate-conjugated PEGylated SPIONs, which involves the attachment of such molecules at the surface through polycondensation reactions, without the need for coupling agents or prior modification on the species involved. The size of iron oxide cores obtained by transmission electron microscopy was about 12 nm. The conjugation of folate onto SPIONs was confirmed by FTIR spectroscopy. The folate conjugated nanoparticles were colloidal stable in PBS, presenting a hydrodynamic diameter of 109±1 nm and PDI 0.148. The obtained folate-targeted PEGylated SPIONs showed superparamagnetic behavior with a saturation magnetization of 73.1 emu·g −1 at 300 K. Their specific absorption rate (SAR) ranged from 32.8 to 15.0 W g −1 in an alternating magnetic field of 10-16 kA m −1 and frequency of 420-203 kHz. The heat generated was sufficient to raise the sample temperature to the therapeutic range used in MFH establishing this system as promising candidates for use in MFH treatment.

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Key Parameters in Phototherapy with Gold Nanorods Using Continuous Near Infrared Radiation

Freitas

Belo

Granja

et al. 2023

Adv Materials Inter

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As nanoparticle formulations move toward human clinical trials in photothermal cancer therapy (PTT), the influence of individual key parameters on the heating efficacy must be thoroughly assessed. This work reports a systematic study on the heating performance of gold nanorods during exposure to near‐infrared radiation, evaluating the influence of nanorods concentration, total volume, laser output power, and spot area. Interestingly, the lowest concentration tested (24 µg mL−1) shows the most promising results with a SAR (Specific Absorption Rate) value of 24.6 kW gAu−1 for the highest laser power (0.8 W), spot area (0.4 cm2), volume (1 mL). The laser output power and concentration proved to be the key parameters in global heating of the sample. The cuvette's optical path length also proves to be an important parameter given that there is a threshold concentration value beyond which no significant improvement will be observed, and the higher gold mass will play a detrimental role suppressing SAR values. It is experimentally demonstrated that the multi‐parameter exploration can lead to a finer control of the performance in PTT, opening a pathway for efficient heating of low nanoparticle concentrations.

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Long‐Term Stability and Reproducibility of Magnetic Colloids Are Key Issues for Steady Values of Specific Power Absorption over Time

Cited by 37 publications

References 47 publications

Magnetic nanoparticles boosting the osmotic efficiency of a polymeric FO draw agent: Effect of polymer conformation

Magnetic nanoparticles boosting the osmotic efficiency of a polymeric FO draw agent: Effect of polymer conformation

PEGlatyon-SPION surface functionalization with folic acid for magnetic hyperthermia applications

Key Parameters in Phototherapy with Gold Nanorods Using Continuous Near Infrared Radiation

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