Synergetic proton-conducting effect of sulfonated PEEK-MO2-CNT membranes for PEMFC applications

Roy, Tushar; Wanchoo, Sunil Kumar; Pal, Kaushik

doi:10.1007/s11581-021-04259-8

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…The Raman, FT-IR, and XPS analyses confirmed that both the SiO 2 -a and SiO 2 -b particles possess similar chemical environments, containing the same chemical species, exhibiting similar vibrational energies, and displaying consistent O/Si atomic ratios (1.45 and 1.54, respectively). These results align with chemical properties encountered in silica sol-gel particles [ 30 , 33 , 36 ]. The presence of TEOS and ethanol molecules, common by-products in sol-gel processes, was confirmed by the identification of C-Si, C-O, C-C, and C-H species ( Figure 6 ).…”

Section: Discussionsupporting

confidence: 81%

“…In the XPS spectra, the presence of atomic orbitals belonging to Si and O was determined, both associated with the silica (SiO 2 ) structure, as reported in [ 36 ]. These systems presented Si:O atomic ratios of 1:1.54 (SiO 2 -a) and 1:1.44 (SiO 2 -b).…”

Section: Resultsmentioning

confidence: 99%

“…These peaks can be attributed to the C-Si and Si-O-Si bonding configurations, respectively [ 38 ]. The C-Si bonds are present in the TEOS precursor, while the Si-O-Si bonds are characteristic of the SiO 2 network [ 36 ]. For the C species, two main peaks were also observed at 284.66 and 285.37 eV for SiO 2 -a and at 284.73 and 285.34 eV for SiO 2 -b.…”

Section: Resultsmentioning

confidence: 99%

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A Novel In Situ Sol-Gel Synthesis Method for PDMS Composites Reinforced with Silica Nanoparticles

Cordoba,

Cauich-Rodríguez,

Vargas-Coronado

et al. 2024

Polymers

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The addition of nanostructures to polymeric materials allows for a direct interaction between polymeric chains and nanometric structures, resulting in a synergistic process through the physical (electrostatic forces) and chemical properties (bond formation) of constituents for the modification of their properties and potential cutting-edge materials. This study explores a novel in situ synthesis method for PDMS-%SiO2 nanoparticle composites with varying crosslinking degrees (PDMS:TEOS of 15:1, 10:1, and 5:1); particle concentrations (5%, 10%, and 15%); and sol-gel catalysts (acidic and alkaline). This investigation delves into the distinct physical and chemical properties of silicon nanoparticles synthesized under acidic (SiO2-a) and alkaline (SiO2-b) conditions. A characterization through Raman, FT-IR, and XPS analyses confirms particle size and agglomeration differences between both the SiO2-a and SiO2-b particles. Similar chemical environments, with TEOS and ethanol by-products, were detected for both systems. The results on polymer composites elucidate the successful incorporation of SiO2 nanoparticles into the PDMS matrix without altering the PDMS’s chemical structure. However, the presence of nanoparticles did affect the relative intensities of specific vibrational modes over composites from −35% to 24% (Raman) and from −14% to 59% (FT-IR). The XPS results validate the presence of Si, O, and C in all composites, with significant variations in atomic proportions (C/Si and O/Si) and Si and C component analyses through deconvolution techniques. This study demonstrates the successful in situ synthesis of PDMS-SiO2 composites with tunable properties by controlling the sol-gel and crosslinking synthesis parameters. The findings provide valuable insights into the in situ synthesis methods of polymeric composite materials and their potential integration with polymer nanocomposite processing techniques.

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Section: Discussionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%