Fast ultrasound assisted synthesis of chitosan-based magnetite nanocomposites as a modified electrode sensor

Freire, Tiago M.; Dutra, Lilian M.U.; Queiroz, Danilo C.; Ricardo, Nágila Maria Pontes Silva; Barreto, K.; Denardin, Juliano C.; Wurm, Frederik R.; Sousa, Camila P.; Correia, Adriana N.; Lima‐Neto, Pedro de; Fechine, Pierre Basílio Almeida

doi:10.1016/j.carbpol.2016.05.095

Cited by 64 publications

(46 citation statements)

References 52 publications

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“…The results are in agreement with those accomplished by CV (Fig. 1a) [47,57]. Figure 2a, b shows the TEM micrographs for the magnetic nanocomposite at different magnifications.…”

Section: Characterization Of the Modified Electrodesupporting

confidence: 89%

“…One can be observe a presence of two distinct morphology: rods and spherical. It is interesting to note that the nanorod morphology is not present in the previous work [47,[58][59][60]. Thus, this result suggesting that the increase in the ultrasound time may lead to the formation of nanorods of magnetite coated with chitosan.…”

Section: Characterization Of the Modified Electrodementioning

confidence: 71%

“…Chit-Fe 3 O 4 composite were synthesized according to the methodology developed by our research group [47]. Fe 3 O 4 suspension was prepared at a concentration of 1 mg mL −1 using 0.04 mol L −1 BR buffer (pH 6.0) and before of the use the suspension was sonicate in an ultrasound bath for 10 min.…”

Section: Sensor Preparationmentioning

confidence: 99%

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Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

et al. 2018

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A novel platform for carbamate-based pesticide quantification using a chitosan/magnetic iron oxide (Chit-FeO) nanocomposite as a glassy carbon electrode (GCE) modifier is shown for an analytical methodology for determination of bendiocarb (BND). The BND oxidation signal using GCE/Chit-FeO compared with bare GCE was catalyzed, showing a 37.5% of current increase with the peak potential towards less positive values, showing method's increased sensitivity and selectivity. Using square-wave voltammetry (SWV), calibration curves for BND determination were obtained (n = 3), and calculated detection and quantification limits values were 2.09 × 10 mol L (466.99 ppb) and 6.97 × 10 mol L (1555.91 ppb), respectively. The proposed electroanalytical methodology was successfully applied for BND quantification in natural raw waters without any sample pretreatment, proving that the GCE/Chit-FeO modified electrode showed great potential for BND determination in complex samples. ᅟ Graphical abstract.

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“…The results are in agreement with those accomplished by CV (Fig. 1a) [47,57]. Figure 2a, b shows the TEM micrographs for the magnetic nanocomposite at different magnifications.…”

Section: Characterization Of the Modified Electrodesupporting

confidence: 89%

Section: Characterization Of the Modified Electrodementioning

confidence: 71%

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Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

et al. 2018

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“…A small shoulder at 1632 cm −1 and the bands at 1554 and 1327 cm −1 can be associated to C=O stretching modes (amide I), N-H deformation modes (amide II) and C-N stretching modes (amide III), respectively [38,39]. The band near to 1026 cm −1 was assigned to stretching vibration C-O of ether and primary alcohol, and can be associated with the presence of glycerol and the piranosydic bonds of chitosan [14,40]. Additionally, the asymmetric stretching mode of the C-O-C bridge was observed at 1153 cm −1 [40].…”

Section: Ftirmentioning

confidence: 95%

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

et al. 2020

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Magneto-dielectric composites are interesting advanced materials principally due to their potential applications in electronic fields, such as in microstrip antennas substrates. In this work, we developed superparamagnetic polymer-based films using the biopolymeric matrices chitosan (Ch), cellulose (BC) and collagen (Col). For this proposal, we synthesized superparamagnetic iron oxide nanoparticles (SPIONs) functionalized with polyethyleneimine with a cheap method using sonochemistry. Further, the SPIONs were dispersed into polymer matrices and the composites were evaluated regarding morphology, thermal, dielectric and magnetic properties and their application as microstrip antennas substrates. Microscopically, all tested films presented a uniform dispersion profile, principally due to polyethyleneimine coating. Under an operating frequency (fo) of 4.45 GHz, Ch, BC and Col-based SPION substrates showed moderate dielectric constant (ε′) values in the range of 5.2–8.3, 6.7–8.4 and 5.9–9.1, respectively. Furthermore, the prepared films showed no hysteresis loop, thereby providing evidence of superparamagnetism. The microstrip antennas showed considerable bandwidths (3.37–6.34%) and a return loss lower than −10 dB. Besides, the fo were modulated according to the addition of SPIONs, varying in the range of 4.69–5.55, 4.63–5.18 and 4.93–5.44 GHz, for Ch, BC and Col-based substrates, respectively. Moreover, considering best modulation of ε′ and fo, the Ch-based SPION film showed the most suitable profile as a microstrip antenna substrate.

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“…27 Silver nanoparticles have been prepared conventionally by chemical method using reducing agents, 28 which were later responsible for various biological hazards due to their cytotoxic effect. To cure this problem, green synthesis using biological molecule and the use of ultrasound as an energy source 29,30 exhibit superiority over chemical methods. Plant extracts have been demonstrated to be promising reducing and capping agents for the biosynthesis of silver nanoparticles, some of them are Crocus sativus L., 31 Alpinia katsumadai, 32 Kalopanax septemlobus, 33 Acalypha indica, 34 Citrus limon, 35 Alternanthera sessilis, 36 Aloe vera, 37 Lippia nodiflora, 38 Pedalium murex, 39 etc.…”

Section: Introductionmentioning

confidence: 99%

BIOCIDAL ACTIVITY OF Ag-PEG-CHITOSAN NANOCOMPOSITE FILM PREPARED USING CANNABIS SATIVA AQUEOUS LEAF EXTRACT BY SONICATION

Ameta

Punjabi

2018

ECB

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This study underscores the development of Ag-PEG-Ch nanocomposite film using the aqueous leaves extract of Cannabis sativa under the influence of ultrasound, as smart substrates for antimicrobial uses, via innovative in situ reactive and reduction pathways. Ag nanoparticles that are synthesized by using leaves extract and ultrasound as an energy source have emerged as nontoxic and ecofriendly. In this study, silver nitrate was used as a silver precursor and PEG and chitosan were used as the polymeric stabilizer and solid support, while cannabis sativa leaves extract acts as a green reducing agent. This polymer metal film was characterized by FT-IR, SEM, TEM, TGA, DSC and antimicrobial activities. XRD peaks clearly reveals that FCC Ag nanoparticles embedded in polymer matrix, very fine Ag nanoparticles (4-6 nm) can be synthesized through ultrasound has been proven by TEM images and TGA-DSC results show that this nanocomposite film is thermally stable. This nanocomposite film possesses synergistic biocidal activities also.

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Fast ultrasound assisted synthesis of chitosan-based magnetite nanocomposites as a modified electrode sensor

Cited by 64 publications

References 52 publications

Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

BIOCIDAL ACTIVITY OF Ag-PEG-CHITOSAN NANOCOMPOSITE FILM PREPARED USING CANNABIS SATIVA AQUEOUS LEAF EXTRACT BY SONICATION

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