Photochemical synthesis of silver nanoparticles on chitosans/montmorillonite nanocomposite films and antibacterial activity

Gabriel, Juliana S; Gonzaga, Virgínia A M; Poli, Alessandra Lima; Cavalheiro, Carla Cristina Schmitt

doi:10.1016/j.carbpol.2017.05.021

Cited by 80 publications

(29 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure presents the XRD pattern for Lap, chitosan scaffold and nanocomposite scaffolds at different Lap loadings. The diffraction pattern for chitosan scaffold presents peaks on ~2θ = 10.1 and 20°, which corresponds to hydrated crystalline structure and to an amorphous structure of chitosan, respectively (Gabriel, Gonzaga, Poli, & Schmitt, ; Olad & Farshi Azhar, ).…”

Section: Resultsmentioning

confidence: 99%

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

et al. 2019

Self Cite

View full text Add to dashboard Cite

The pivotal issue of skin regeneration research is the development of effective biomaterials that exhibit biological activities as fungicide and bactericide, combining simple and low cost manufacturing technologies. In this context, nanocomposite scaffolds based on chitosan (Ch)/Laponite (Lap) were produced by using different concentrations of Lap via freeze‐drying process for potential application in skin regeneration. The influence of Lap concentration on the scaffold properties was evaluated. The prepared scaffolds were characterized by x‐ray diffraction (XRD), scanning electron microscopy (SEM), porosity, swelling capacity, and mechanical analyses. The results revealed that the scaffolds exhibited a porous architecture, besides the increase in the clay content, leads to an increase in the porosity, an improvement of mechanical strength, and a decrease of swelling capacity. In vitro tests were also carried out to evaluate the biocompatibility of the materials, such as bioadhesion, antibacterial activity, viability, and cell adhesion. Viability and cell adhesion demonstrated that all scaffolds were not cytotoxic and the fibroblast cells readily attached on the surface of the scaffolds. Thereby, the results suggested that the nanocomposite scaffolds are biomaterials potentially useful as wound dressings.

show abstract

Section: Resultsmentioning

confidence: 99%

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the nanocomposite films containing 5, 10 and 20 wt % in SWy-1 mass, there is a lower and wider 001 reflection peak than pure SWy-1, indicating the occurrence of intercalation along with some clay exfoliation 18,25 On the other hand, the 001 reflection peak for PAA/30%SWy-1 has been shifted toward lower angles, which is an indication of the lower regularity and large basal spacing as a result of the intercalation of PAA chains into the clay galleries 26 . Figure 3 presents FTIR-ATR spectra of PAA, SWy-1 and PAA/5%SWy-1 nanocomposite film.…”

Section: Characterization Of Nanocomposite Filmsmentioning

confidence: 97%

“…Owing to the degradation rate, the SWy-1 might be considered as stabilizer against UV irradiation. Thereby, this stabilization can be explained by SWy-1 ability to disperse the incident light in addition to its absorbtion part of the UV light instead of PAA, hence minimizing the degradation rate 18,34 .…”

Section: (1)mentioning

confidence: 99%

“…The polymer materials photodegradation is a concern in their process and usage, even in polymer layered silicate nanocomposites, as a consequence, it has been a subject of studies 18,19 . Thus, it is necessary to gain a better understanding of degradation and stabilization to ensure long life for the product, since this process for this nanocomposite is poorly understood.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite

et al. 2018

View full text Add to dashboard Cite

Polyacrylic acid (PAA)/clay mineral (SWy-1) nanocomposites were prepared by intercalation in solution and their photostability was evaluated. For the nanocomposite films containing 5, 10 and 20 wt % in SWy-1 mass occurred intercalation along with some clay exfoliation, while for PAA/30%SWy-1, the intercalation of PAA chains into the clay interlayers was observed. Scanning Electron Microscopy (SEM) images of the films suggested that nanocomposite films are homogeneous, indicating efficient dispersion of the polymer matrix into the SWy-1 clay. The thermal degradation temperatures of depolymerisation for the nanocomposite films were higher (362-370 °C) than pure PAA (361 °C), which means that the presence of SWy-1 clay promotes thermal stabilization.The photooxidative degradation of pure PAA and nanocomposite films was followed using Size Exclusion Chromatography (SEC). The degradation rate constant for pure PAA was higher than nanocomposite films; therefore, the increase of SWy-1concentration detained the degradation of PAA. The presence of SWy-1 clay contributes for the photostabilization of the material. SWy-1 has ability to disperse the incident light as well as also to absorb part of the UV light instead of PAA, hence minimizing the degradation rate.

show abstract

“…Synthetic silver or Ag/TiO 2 nanomaterials have been developed and successfully manufactured by several methods due to the wide applications that are found tremendously in different fields. e synthetic methods include chemical reduction [12], chemical vapor deposition [13], electrochemical [14], green synthesis [15], HVPG [16][17][18], microwave [19], photochemical [20], radiation [21], and sonochemical [22].…”

Section: Introductionmentioning

confidence: 99%

Structures, Morphological Control, and Antibacterial Performance of Ag/TiO₂ Micro-Nanocomposite Materials

Muflikhun

Chua

Santos

2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Structures, morphological control, and antibacterial activity of silver-titanium dioxide (Ag/TiO2) micro-nanocomposite materials against Staphylococcus aureus are investigated in this study. Horizontal vapor phase growth (HVPG) technique was used to synthesize the Ag/TiO2 micro-nanomaterials, with parameters of growth temperature and baking time. The materials were characterized by using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and atomic force microscope (AFM). The result indicated that the HVPG technique is able to synthesize Ag/TiO2 with many shapes in micro- and nanoscale such as nanoparticles, nanorods, triangular nanomaterials, and nanotubes. The results showed that the shape of micro- and nanocomposites material could be arranged by adjusting the parameters. The results revealed that the nanorods structure were obtained at 1000°C growth temperature and that 8 hours of baking time was ideal for antibacterial application. Treating the S. aureus stock with Ag/TiO2 nanocomposites is able to reduce bacterial growth with a significant result.

show abstract

Photochemical synthesis of silver nanoparticles on chitosans/montmorillonite nanocomposite films and antibacterial activity

Cited by 80 publications

References 46 publications

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite

Structures, Morphological Control, and Antibacterial Performance of Ag/TiO₂ Micro-Nanocomposite Materials

Contact Info

Product

Resources

About

Photochemical synthesis of silver nanoparticles on chitosans/montmorillonite nanocomposite films and antibacterial activity

Cited by 80 publications

References 46 publications

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

Chitosan‐laponite nanocomposite scaffolds for wound dressing application

Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite

Structures, Morphological Control, and Antibacterial Performance of Ag/TiO2 Micro-Nanocomposite Materials

Contact Info

Product

Resources

About

Structures, Morphological Control, and Antibacterial Performance of Ag/TiO₂ Micro-Nanocomposite Materials