Preparation and characterization of core-shell type Ag@SiO2 nanoparticles for photodynamic cancer therapy

Dhanalekshmi, K.I.; Magesan, P.; Sangeetha, K.; Zhang, Xiang; Jayamoorthy, K.; Srinivasan, N.

doi:10.1016/j.pdpdt.2019.10.006

Cited by 24 publications

(17 citation statements)

References 30 publications

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“…The formulation of Ag@SiO 2 nanoparticles was based on the Stöber method (Stöber et al, 1968), and the control in shape and size was accomplished in the present study as observed on SEM analysis (Figure 3), where the size was measured, showing an average of 683.51 nm diameter. The nanosized structure of these particles may contribute to the release of compounds, such as antibacterial agents (Dhanalekshmi et al, 2019; Guo et al, 2019; Liu et al, 2017) and other drugs (He et al, 2015; Yang et al, 2016). The presence of Ag as the core of the nanoparticles is suggested by the results found in, XRD, FTIR, TGA, and TEM, UV–Vis analysis.…”

Section: Discussionmentioning

confidence: 99%

“…The silver nanoparticles release oxidized Ag + ions that are the active species that penetrated the bacterial membrane, resulting in cell death (Dhanalekshmi et al, 2019; Feng et al, 2019; Yang et al, 2016). The release of these ions was shown previously in free silver nanoparticles with effective antibacterial activity against Enterococcus faecalis (Sofi et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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Synthesis of silver core‐shell nanoparticles and their influence on an experimental resin endodontic sealer: An in vitro analysis

et al. 2022

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Aim: To avoid root canal recontamination and endodontic treatment failure, endodontic sealers with antibacterial activity could be an alternative. Silver nanoparticles have antibacterial activity and this study aimed to synthesize Ag@SiO 2 nanoparticles, incorporate them into an experimental endodontic resin sealer and evaluate their influence on physicochemical and biological properties.Methodology: Ag@SiO 2 nanoparticles were produced using the sol-gel process, based on the Stöber method. The particles were characterized in terms of their chemical structure by Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), UV-Vis spectral analysis, scanning electron microscopy, and transmission electron microscopy, where the particle morphology and diameter were analysed. A dual-cured experimental endodontic resin sealer was formulated using 70 wt% UDMA, 15 wt% GDMA, and 15 wt% BisEMA. The photoinitiators were added separately in two pastes. The Ag@SiO 2 nanoparticles were incorporated into the endodontic sealer at the concentrations of 2.5 wt%, 5 wt%, and 10 wt%, and a control group without nanoparticles was also formulated. The endodontic sealers were evaluated for their flow, film thickness, degree of conversion, softening in solvent, radiopacity, cytotoxicity and antibacterial activity immediately and after 9 months in water storage.Results: Silver was detected in the chemical characterization of Ag@SiO 2 that presented a spheric regular shape and average 683.51 nm ± 93.58 diameter. Sealers presented adequate flow and film thickness while radiopacity values were below the ones required by ISO 6876. All groups underwent softening after immersion in a solvent. The 10 wt% groups showed a higher loss of subsurface hardness (∆KHN%).No reduction in cell viability was observed. Enterococcus faecalis viability in biofilm was reduced in 10 wt% groups after 24 h and 9 months. Conclusion:The addition of 10 wt% Ag@SiO 2 reduced E. faecalis viability at immediate and longitudinal analysis while maintaining the physicochemical properties of developed sealers.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Synthesis of silver core‐shell nanoparticles and their influence on an experimental resin endodontic sealer: An in vitro analysis

et al. 2022

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“…[1][2][3][4][5] Targeting these organic substances, precious metal catalysts are mainly used to react with reducing agents to generate compounds that are less toxic, easily degradable, and less polluting to water, or non-polluting, thereby achieving the reuse of water resources. 5,6 Precious metal nanoparticles have special optical, catalytic, electrochemical and mechanical properties, so they have potential applications in optics, [7][8][9] catalysis, [10][11][12] microelectronics, [13][14][15] biomedicine 16,17 and many other elds. The most common used catalysts are gold, 18-20 silver 1, [21][22][23][24] and palladium.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of CS/GA/RGO/Pd composite hydrogels for highly efficient catalytic reduction of organic pollutants

Zhang

Wang

et al. 2020

RSC Adv.

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“…Ultimately, they proved to be beneficial in several applications in areas like surface engineering, drug delivery, analytical chemistry, bio encapsulation, Nano composite as well as in electronic, magnetic, optical, and mechanical devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of the Nanocomposite Mo2C(1-x)-TiC(x)-SWCNTs by Field Actived Sparck Plasma Sintering Process

Noudem

Mouyane

Bernard

et al. 2020

JAN

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Nanocomposites are worn resistant materials used in cutting tool applications. The materials are composed of ultrafine powder hard phase grains surrounded by a tough binder phase carbon nanotubes (Mo2C)1-x–(TiC)x (2≤x≤4)//1Wt% SWCNTs. Composite bicarbide Mo2C-TiC was rapidly synthesised and simultaneously consolidated by field activated sintering technique (spark plasma sintering) at which the extensive volume expansion occurred as a function of the volumic fraction from 20 to 40 vol.% of TiC powders and 1 Wt.% of SWCNTs was reinforcement of the NCMC’s. The sintered powder mixture was examined by XRD patterns, the morphology of the obtained phase was observed by SEM and the phase compositions in different regions were analyzed by EDX. The composites were processed using Field Activated Sintering Technique, spark plasma sintering (SPS) at temperatures in the range of 1700-1800°C with addicting of SWCNTs. The effects of SWCNTs addition on phases morphology, microstructure hardness and fracture toughness of the nanocomposite were investigated. The best product contained 1.0 Wt% SWCNTs from (Mo2C)1-x–(TiC)x , x= 0.2 which was sintered at 1700°C, 70 MPa for 10 min, M0.8T0.2/ 1 Wt% SWCNTs exhibit a better density, highest hardness and good ductility. Relative densification was achieved 99.5 % from the theoretical and good mechanical properties like hardness and fracture toughness (KIC=5.6 Mpa m1/2) are improved. The results were confirmed using Raman scattering resonant spectroscopy.

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Preparation and characterization of core-shell type Ag@SiO2 nanoparticles for photodynamic cancer therapy

Cited by 24 publications

References 30 publications

Synthesis of silver core‐shell nanoparticles and their influence on an experimental resin endodontic sealer: An in vitro analysis

Synthesis of silver core‐shell nanoparticles and their influence on an experimental resin endodontic sealer: An in vitro analysis

Fabrication of CS/GA/RGO/Pd composite hydrogels for highly efficient catalytic reduction of organic pollutants

Study of the Nanocomposite Mo2C(1-x)-TiC(x)-SWCNTs by Field Actived Sparck Plasma Sintering Process

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