Synthesis and characterization of silica-, meso-silica- and their functionalized silica-coated copper oxide nanomaterials

El‐Nahhal, Issa M.; Salem, Jamil K.; Kuhn, S.; Hammad, Talaat M.; Hempelmann, Rolf; Bhaisi, Sara Al

doi:10.1007/s10971-016-4034-z

Cited by 16 publications

(18 citation statements)

References 29 publications

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“…When the green synthesized NS were subjected to increasingly high temperature, there was a breakdown of surface capping agent (hydroxytyrosol), which resulted in the combustion of bio-capping agent attached to the surface of NS. The thermal decomposition of CuO-NS and CeO 2 -NS around at 600°C was due to high temperature oxygen decay ( El-Nahhal et al, 2016 ; Maqbool, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…But due to the optimized charged surface, NS probably can penetrate through cellular covering. In some of the previously observed bactericidal activities, thiol (-SH) group present in the bacterial cell surface protein also have shown strong affection for metal oxide NS, due to which NS may also involve in denaturation of bacterial surface proteins ( El-Nahhal et al, 2016 ; Lu et al, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

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RETRACTED: CuO and CeO2 Nanostructures Green Synthesized Using Olive Leaf Extract Inhibits the Growth of Highly Virulent Multidrug Resistant Bacteria

et al. 2018

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One of the major challenges of nano-biotechnology is to engineer potent antimicrobial nanostructures (NS) with high biocompatibility. Keeping this in view, we have performed aqueous olive leaf extract mediated one pot facile synthesis of CuO-NS and CeO2-NS. Prepared NS were homogenous, less than 26 nm in size, and small crystallite units as revealed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. Fourier transform infrared spectroscopy (FTIR) of CuO-NS and CeO2-NS showed typical Cu-O prints around 592–660 cm-1 and Ce-O bond vibrations at 453 cm-1. The successful capping of CuO-NS and CeO2-NS by compounds present in the plant extract was further validated by high performance liquid chromatography (HPLC) and thermal gravimetric analysis (TGA). Active phyto-chemicals from the leaf extract simultaneously acted as strong reducing as well as capping agent in the NS synthesis. NS engineered in the present study showed antibacterial potential at extremely low concentration against highly virulent multidrug-resistant (MDR) gram-negative strains (Escherichia coli, Enterobacter cloacae, Acinetobacter baumannii and Pseudomonas aeruginosa), alarmed by World Health Organization (WHO). Furthermore, CuO-NS and CeO2-NS did not show any cytotoxicity on HEK-293 cell lines and Brine shrimp larvae indicating that the NS green synthesized in the present study are biocompatible.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

RETRACTED: CuO and CeO2 Nanostructures Green Synthesized Using Olive Leaf Extract Inhibits the Growth of Highly Virulent Multidrug Resistant Bacteria

et al. 2018

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“…The presence of strong a new peaks at 1076 cm −1 and 808 cm −1 are associated with Si-O-Si asymmetric and symmetric stretching vibrations, the band at 461 cm −1 is correspond to the Si-O-Si bending vibration. The presence of Si-O-Si peaks at 1076-461 cm −1 and the decreasing in the intensity of (O-H) peaks at 3710 and 1438 cm −1 upon coating with silica is provide strong evidence for the incorporated of silica onto the surface of MgO-NPs and formation of Si-O-Mg linkages [26][27][28][29][30]. This also provides evidence for the conversion from the Mg(OH) 2 to MgO upon silica coating.…”

Section: Infrared Spectramentioning

confidence: 95%

“…1a, b) are associated with free ν(O-H) and hydrogen bonding ν(O-H) of MgO-NPs crystallizing water molecules, respectively. The absorption peak at 1650 cm −1 and at 1438 cm −1 are probably associated with δ(O-H) vibrations [26][27][28][29][30]41]. The presence of strong a new peaks at 1076 cm −1 and 808 cm −1 are associated with Si-O-Si asymmetric and symmetric stretching vibrations, the band at 461 cm −1 is correspond to the Si-O-Si bending vibration.…”

Section: Infrared Spectramentioning

confidence: 99%

“…The synthesis of silica coated metal oxide nanomaterials were recently reported using two main strategies: the first strategy is to incorporated silane precursors during the growth of metal oxides as coating agent [19][20][21][22][23][24][25][26], the second strategy is to use sol-gel process for coating of previously prepared metal oxide nanoparticles [27][28][29][30][31]. Most metal oxides that have been coated with silica are ZnO [27,28], CuO [29], NiO [30], TiO [31]. Very little research has been devoted to the fabrication of silica coated magnesium oxide [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Silica, Mesoporous Silica and Its Thiol Functionalized Silica Coated MgO and Mg(OH)2 Materials

et al. 2019

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Silica (SiO 2) and mesoporous silica (mSiO 2) coated magnesium oxide composites were prepared based on hydrolysis and co-condensation of tetraethylorthosilicate (TEOS) in presence of magnesium oxide nanoparticles (MgO-NPs) and cetyltrimethylammonium bromide (CTAB). Functionalization with thiolorganofunctional silane precursor was conducted onto the surface of mesosilica (Scheme 1). Silica coated MgO composites and its thiol functionalized material have been characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope, Fourier transform spectroscopy (FTIR), ultra violet-visible spectra and thermal analysis (TGA). TEM analysis showed that the MgO nanoparticles were encapsulated into the SiO 2 or mSiO 2 precursors. XRD analysis reveals that magnesium oxide are exist into both forms, cubic MgO-structure and hexagonal Mg(OH) 2-structure, which is converted into cubic structure upon silica coating. The mean crystallite size of MgO-NPs remains almost unchanged after coating with silica precursors. TGA and FTIR results indicated that the coated mesosilica layer around magnesium oxide nanoparticles has been successfully grafted by thiolorganofunctional silane groups.

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Study on the property of mesoporous silica nanoparticles loaded with nisin for poly (lactic acid)‐based packaging film

Jiang

Zhu

et al. 2023

Polymer Composites

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Nisin was loaded in mesoporous silica nanoparticles (MSN) (0, 1, 2 and 3 wt%) and incorporated into poly (lactic acid) (PLA) matrix by casting method. The mechanical property, water vapor permeability, thermal property, and antimicrobial property of PLA nanocomposite films were measured. And the internal structure of the composite film was observed through the Scanning electron microscope. Meanwhile, the kinetic of nisin releasing from food simulated solution was investigated and the migration model was established. The result showed that mesoporous silica had an effect on the mechanical and thermal property of the composite films. Both water vapor transmission rate (WVP) and oxygen permeation rate (OTR) decreased, especially for 3MSN/NI/PLA, where WVP decreased by about 9.64% and OTR decreased by 35.19%, which was beneficial to improve the preservation effect. With the addition of MSN, the amount of loaded nisin increased, and at 3MSN/NI, the nisin loading reached 88.75%, and the mesoporous silica could effectively control the release of nisin, thus prolonging the preservation effect. The release kinetic of nisin was described by Fick's law and Weibull's model. In short, the PLA nanocomposite film has the potential to be used as an antimicrobial active film by adding nisin as an antimicrobial agent.Highlights A biodegradable antimicrobial food grade film was prepared. Nisin was added to the films as an antimicrobial agent. The ordered mesoporous structure of MSN was used as a carrier of antimicrobial agent. The film effectively inhibits E. coli and S. aureus by controlling the release of nisin. Fick's law and Weibull's model were used to describe the release kinetics of Nisin.

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Synthesis and characterization of silica-, meso-silica- and their functionalized silica-coated copper oxide nanomaterials

Cited by 16 publications

References 29 publications

RETRACTED: CuO and CeO2 Nanostructures Green Synthesized Using Olive Leaf Extract Inhibits the Growth of Highly Virulent Multidrug Resistant Bacteria

RETRACTED: CuO and CeO2 Nanostructures Green Synthesized Using Olive Leaf Extract Inhibits the Growth of Highly Virulent Multidrug Resistant Bacteria

Silica, Mesoporous Silica and Its Thiol Functionalized Silica Coated MgO and Mg(OH)2 Materials

Study on the property of mesoporous silica nanoparticles loaded with nisin for poly (lactic acid)‐based packaging film

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