Photochemical aging of an e-PTFE/NOMEX® membrane used in firefighter protective clothing

Aidani, Rachid El; Nguyen-Tri, Phuong; Malajati, Yassine; Lara, Jaime; Vu‐Khanh, Toan

doi:10.1016/j.polymdegradstab.2013.04.002

Cited by 40 publications

(23 citation statements)

References 18 publications

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“…This research is a continuous works focused on polymers and multifunctional composites [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86]. The main findings of this work were as follows:…”

Section: Discussionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

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105

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This work emphasizes the use of the silver decorative method to enhance the antibacterial activity of TiO2 and ZnO nanoparticles. These silver-decorated nanoparticles (hybrid nanoparticles) were synthesized using sodium borohydride as a reducing agent, with the weight ratio of Ag precursors/oxide nanoparticles = 1:30. The morphology and optical properties of these hybrid nanoparticles were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, and UV-Vis spectroscopy. The agar-well diffusion method was used to evaluate their antibacterial activity against both Staphylococcus aureus and Escherichia coli bacteria, with or without light irradiation. The TEM images indicated clearly that silver nanoparticles (AgNPs, 5–10 nm) were well deposited on the surface of nano-TiO2 particles (30–60 nm). In addition to this, bigger AgNPs (<20 nm) were dispersed on the surface of nano-ZnO particles (30–50 nm). XRD patterns confirmed the presence of AgNPs in both Ag-decorated TiO2 and Ag-decorated ZnO nanoparticles. UV-Vis spectra confirmed that the hybridization of Ag and oxide nanoparticles led to a shift in the absorption edge of oxide nanoparticles to the lower energy region (visible region). The antibacterial tests indicated that both oxide pure nanoparticles did not exhibit inhibitory effects against bacteria, with or without light irradiation. However, the presence of AgNPs in their hybrids, even at low content (<40 mg/mL), leads to a good antibacterial activity, and higher inhibition zones under light irradiation as compared to those in dark were observed.

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Section: Discussionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

Self Cite

105

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“…It can be seen that the most intense and sharp (100) peak at 2 θ = 18° is typically associated with the crystalline structure of PTFE, indicating that the crystalline phase is the dominant phase in the PTFE polymer . The height of crystal peak of r‐PTFE obviously increases with increasing milling time and two new small peaks at 2 θ = 31° (110) and 37° (201)/(107) are visible after high energy ball milling, which indicates the existence of new orientations of the molecular chain . These changes contribute to the scission, which decreases the length of the macromolecular chains and thus favors to secondary crystallization.…”

Section: Resultsmentioning

confidence: 98%

Recycling and application of wasted polytetrafluoroethylene via high-energy ball milling technology for nitrile rubber composites preparation

Cao

Liu

et al. 2016

Polym Eng Sci

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Wasted polytetrafluoroethylene fibers were recycled using high-energy ball milling technique, and the recylced polytetrafluoroethylene (r-PTFE) was employed to prepare nitrile rubber (NBR)/r-PTFE composites. The structure of r-PTFE and properties of NBR/r-PTFE composites were investigated by polarized optical microscope, laser particle size analyzer, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that increasing the milling time from 4 to 7 h leads to decreasing the average particle size, the degree of crystallinity and the number-average molecular weight of r-PTFE, whereas no obvious change is found by further prolonging the milling time. It is also clear that the NBR/r-PTFE composite with the r-PTFE obtained from a longer milling time possesses a higher mechanical and solvent resistance property. Compared with pure NBR, NBR/r-PTFE composites with r-PTFE for 7 h milling show a 21.9% increase in modulus at 300% and 27.8% decrease in swelling index. POLYM. ENG. SCI., 56:643-649, 2016.

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“…The atomic force microscope (AFM) has been widely used for the study of nanocomposites and polymeric materials with nanoscale spatial resolution [29][30][31][32][33][34][35][36]. AFM-IR allows surface mapping with a resolution of several tens of nanometers.…”

Section: Introductionmentioning

confidence: 99%

Biological Activity and Nanostructuration of Fe3O4-Ag/High Density Polyethylene Nanocomposites

Nguyen-Tri

Nguyen

2019

J. Compos. Sci.

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We report here the synthesis of uniform nanospheres-like silver nanoparticles (Ag NPs, 5–10 nm) and the dumbbell-like Fe3O4-Ag hybrid nanoparticles (FeAg NPs, 8–16 nm) by the use of a seeding growth method in the presence of oleic acid (OA)/oleylamine (OLA) as surfactants. The antibacterial activity of pure nanoparticles and nanocomposites by monitoring the bacterial lag–log growth has been investigated. The electron transfer from Ag NPs to Fe3O4 NPs which enhances the biological of silver nanoparticles has been proven by nanoscale Raman spectroscopy. The lamellae structure in the spherulite of FeAg NPs/High Density Polyethylene (HDPE) nanocomposites seems to play the key role in the antibacterial activity of nanocomposites, which has been proven by nanoscale AFM-IR. An atomic force microscopy coupled with nanoscale infrared microscopy (AFM-IR) is used to highlight the distribution of nanoparticles on the surface of nanocomposite at the nanoscale. The presence of FeAg NPs in PE nanocomposites has a better antibacterial activity than that reinforced by Ag NPs due to the faster Ag+ release rate from the Fe3O4-Ag hybrid nanoparticles and the ionization of Ag NPs in hybrid nanostructure.

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Photochemical aging of an e-PTFE/NOMEX® membrane used in firefighter protective clothing

Cited by 40 publications

References 18 publications

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Recycling and application of wasted polytetrafluoroethylene via high-energy ball milling technology for nitrile rubber composites preparation

Biological Activity and Nanostructuration of Fe3O4-Ag/High Density Polyethylene Nanocomposites

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