Direct grafting of ethylene sulfide onto silicic acid magadiite

Oliveira, Michelle Menezes de; Fernandes, Márcia Maria; Fonseca, Maria G.; Filho, Edson Cavalcanti da Silva; Souza, A. G.; Gaslain, Fabrice; Jaber, Maguy

doi:10.1016/j.micromeso.2014.05.010

Cited by 13 publications

(12 citation statements)

References 43 publications

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“…Peak region between 3200 and 3700 cm −1 confirms the band of silanol groups. 34 Carbonyl bound OH band was confirmed at peak 3480 cm −1 . 35 Figure 3(b) presents the TGA curve for iodine-loaded poly(silicic acid) nanoparticles.…”

Section: F I G U R E 1 Scheme Of Synthesis Of Poly(silicic Acid) Nanomentioning

confidence: 96%

“…The peak located at 809.27 cm −1 is exhibiting the symmetric stretching vibrations of Si O Si. 34 Peak at 960 cm −1 is showing presence of Si OH stretching band. 35 Absorption band in range of 1400-1000 cm −1 elicits the presence of silicate framework.…”

Section: F I G U R E 1 Scheme Of Synthesis Of Poly(silicic Acid) Nanomentioning

confidence: 99%

“…Intense peak at 704 cm −1 gives confirmation of sodium exchange and band in region of 3200-3750 cm −1 represents the overlapping contribution of OH groups of gellan and silanol groups present in the silica structure. 34 Figure 6(a,b)shows the TGA curve of pure gellan film and iodine-loaded poly(silicic acid) gellan nanocomposite film, respectively. In thermogram of gellan film two stages of degradation have been depicted.…”

Section: Preparation and Characterization Of Iodine-loaded Poly(silmentioning

confidence: 99%

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Iodine‐loaded poly(silicic acid) gellan nanocomposite mucoadhesive film for antibacterial application

Pahwa

Ahuja

2020

J of Applied Polymer Sci

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Iodine‐loaded poly(silicic acid) gellan nanocomposite film was fabricated and evaluated for antibacterial properties. Poly(silicic acid) nanoparticles were synthesized by condensation of silicic acid under alkaline conditions in the presence of polyvinyl pyrrolidone, phosphate ions, and molecular iodine. The nanoparticles were incorporated into gellan dispersion to prepare gellan nanocomposite film using the solvent casting method. The nanocomposite films were characterized by Fourier transformed infrared spectroscopy, thermogravimetric analysis, and X‐ray diffraction studies. The results of characterization studies indicated improved thermal stability and an increase in the degree of crystallinity. The scanning electron micrographs and energy dispersive X‐ray spectrum confirmed the uniform dispersion of silica and iodine in the nanocomposite films. The analysis of physical and mechanical properties revealed the enhanced tensile strength, moisture resistance, and higher folding endurance of poly(silicic acid) gellan nanocomposite films as compared to gellan film. Further, the iodine‐loaded poly(silicic acid) gellan nanocomposite films showed good antibacterial activity against Staphylococcus aureus and Escherichia coli and effective mucoadhesive strength. The results indicate that iodine‐loaded poly(silicic acid) gellan nanocomposite mucoadhesive film can be used for potential antibacterial applications in pharmaceuticals.

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Section: F I G U R E 1 Scheme Of Synthesis Of Poly(silicic Acid) Nanomentioning

confidence: 96%

Section: F I G U R E 1 Scheme Of Synthesis Of Poly(silicic Acid) Nanomentioning

confidence: 99%

Section: Preparation and Characterization Of Iodine-loaded Poly(silmentioning

confidence: 99%

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Iodine‐loaded poly(silicic acid) gellan nanocomposite mucoadhesive film for antibacterial application

Pahwa

Ahuja

2020

J of Applied Polymer Sci

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“…The structure of mag is composed of one or multiple negatively charged sheets of SiO 4 tetrahedra with abundant silanol-terminated surfaces. Negative charges in the layers of mag are counterbalanced by hydrated cations (Na + or H + et al) in the interlayer spaces [19][20][21][22]. Mag has a high cation exchange capacity (CEC) that can be applied to ion exchange, whereby the sodium ions can be replaced by protons, other cations or large quaternary ammonium ions [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Formation and optical properties of metal/10-hydroxybenzo[h]quinolone complexes in the interlayer spaces of magadiite by solid–solid reactions

et al. 2018

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Intercalation and in situ formation of three fluorescent complexes, Al(III)-, Cr(III)- and Cu(II)-10-hydroxybenzo[h]quinolone (M-HBQ, M = Al, Cr and Cu), in the interlayer spaces of magadiite (mag) were studied by solid–solid reactions between metal ions exchanged mags (M-mag, M = Al, Cr and Cu) and HBQ. Results show that the basal spacings of the intercalated composites increase after the intercalation of HBQ into M-mags. The amount of HBQ in the intercalated compounds is different due to the amount of metal ions and the diversification of coordination ability of metal ions, and the order of the coordination ability of these three metal ions is Cu2+ > Cr3+ > Al3+. The amount of the metal cations in the interlayer of mag is enough for the in situ complex formation of M-HBQ complexes. The slight shift of the absorption and luminescence bands of the complexes suggests the different microstructures, including molecular packing of the complexes in the interlayer spaces of mags, resulting that the host–guest interactions are formed. These findings show that the intercalation and in situ formation of M-HBQ complexes (M = Al, Cr and Cu) in the interlayer space of mag are successfully achieved in the current work.

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“…Nowadays, the contamination of soils and water with heavy metal cations leads to important environmental concerns. [1][2][3] The presence of these contaminants is mainly due to industrial activities. While extensive studies have been devoted to the remediation in water through the use of plants [4][5][6] or minerals as adsorbants (apatite, iron oxides nanoparticles…) [7][8][9][10][11], the depollution of soils requires other considerations.…”

Section: Introductionmentioning

confidence: 99%

Cysteine-montmorillonite composites for heavy metal cation complexation: A combined experimental and theoretical study

Adraa

Georgelin

Lambert

et al. 2017

Chemical Engineering Journal

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Green Composites based on montmorillonite (Mt) and cysteine, were prepared for heavy metal removal. A comparison between the adsorption properties of the resulting hybrid inorganic-organic materials and the pure montmorillonite was carried out for the following heavy metal cations Cd 2+ , Hg 2+ , Pb 2+ , Co 2+ and Zn 2+. It appears that the adsorption capacity is higher on the composite. Moreover, in release experiments, the heavy metal cations are more strongly retained by the hybrid material. Interactions between the hybrid clay mineral and the inorganic hosts were studied by spectroscopic methods such as solid-state NMR (Nuclear Magnetic Resonance) and FTIR (Fourier Transform Infrared). The experimental data were in agreement with the theoretical periodic DFT (Density Functional Theory) calculations where a molecular picture of the adsorption complex is proposed.

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Direct grafting of ethylene sulfide onto silicic acid magadiite

Cited by 13 publications

References 43 publications

Iodine‐loaded poly(silicic acid) gellan nanocomposite mucoadhesive film for antibacterial application

Iodine‐loaded poly(silicic acid) gellan nanocomposite mucoadhesive film for antibacterial application

Formation and optical properties of metal/10-hydroxybenzo[h]quinolone complexes in the interlayer spaces of magadiite by solid–solid reactions

Cysteine-montmorillonite composites for heavy metal cation complexation: A combined experimental and theoretical study

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