Synthesis and Characterization of Enhanced Proton-Conducting Nafion<sup>® </sup>117- Silica Composite Membranes for Fuel Cell Applications DOI
Mayetu Segale, Touhami Mokrani, Rudzani Sigwadi

et al.

Journal of nano research, Journal Year: 2024, Volume and Issue: 82, P. 95 - 116

Published: April 8, 2024

Nafion ® /silica nanocomposite membranes were prepared by impregnation method from 117 and sol-gel pre-synthesized n-octadecyl-trimethoxy silane (C 18 TMS) coated silica nanoparticles. The scanning electron microscope (SEM) of pristine particles displayed monodispersed nanospheres with diameters ranging 150-350 nm; while Brunauer-Emmett-Teller (BET) analysis presented 760 m 2 /g BET surface area, a micropore-mesopore bimodal distribution micropore systems respective pore volume at 14.6 Å 17.0 (2.01 x 10 -3 cm 3 /g.Å), as well the prolific mesopores centered 29.5 (5.64 -2 /g.Å). Characterization based on SEM, Fourier transform infrared spectroscopy (FTIR), thermogravimetric (TGA), x-ray diffraction (XRD), tensile stress exhibited varying morphology loadings, structural interaction between membrane support ion exchanger, thermal stabilities (up to 330 °C), crystalline nature, reasonable mechanical stability membranes. maximum water uptake (44.8 %) proton conductivity (1.14 x10 S/cm) obtained low /SiO (5%) loaded membrane. While both composite improved reduction in methanol permeability, 2.43x10 -07 /s 80 °C was high (10%) loading. Improved substantiate exchange capacity (IEC) 1.81 meq.g -1 when compared IEC 0.93 [pristine ] 1.46 [Nafion (10%)]. increase value may be due acid functionalization additional sulfonic groups surrounded hydrophilic segments nanosilica, which improves properties coupled great retention capabilities indicated that could utilized for medium temperature fuel cells. Keywords: Fuel cells; membrane; SiO nanofillers; permeability;

Language: Английский

Fluoropolymer sorbent for efficient and selective capturing of per- and polyfluorinated compounds DOI Creative Commons
Zhuojing Yang, Yutong Zhu, Xiao Tan

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Sept. 27, 2024

Language: Английский

Citations

9
Enhancing Selective Hydrofluorocarbon Greenhouse Gas Capture via Halogenation of Metal–Organic Frameworks DOI
R.T. Jerozal, Jaehwan Kim, X. Cynthia

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 16, 2025

Hydrofluorocarbons (HFCs) are anthropogenically produced greenhouse gases with longer atmospheric lifetimes and higher global warming potentials than those of carbon dioxide. General strategies to abate their emissions from industrial point sources, such as via adsorptive capture, remain scarce. Herein, we uncover the key structure–property relationships that lead strong binding HFCs fluoroform (CHF3) difluoromethane (CH2F2) in metal–organic frameworks (MOFs) under low pressures relevant flue gas scrubbing. Extensive sorption computational studies support Zr-based microporous framework MOF-801-Br or HHU-2-Br (HHU = Heinrich-Heine-University Düsseldorf) strongly binds due its synergistic combination Zr-OH sites on nodes bromine linkers. As such, demonstrates a record-setting performance for separating CHF3 N2 dilute conditions. Our work highlights multiple hydrogen-bonding MOFs represents generalizable strategy HFC enabling selective removal waste streams.

Language: Английский

Citations

1
Concerted role of PVDF and carbon nanomaterials for membrane science DOI Creative Commons
Joanna Kujawa, Sławomir Boncel, Samer Al‐Gharabli

et al.

Desalination, Journal Year: 2024, Volume and Issue: 574, P. 117277 - 117277

Published: Jan. 3, 2024

The review concludes with a broad spectrum of practical applications concerted PVDF-CNM membrane materials dedicated for liquid and gas separation, significant focus on the desalination process. research is carried out in diverse science fields, merging chemistry engineering toward frequently multimodal functionalities. Hence, there high demand comprehensive these cutting-edge-materials from across fundamental sciences technologies. main goals work are linking structure PVDF (phases) CNMs (carbon atom hybridization) physico-chemical properties PVDF-CNMs materials. Moreover, attention was paid simplicity generation having huge potential tuning various features obtained (e.g., hydrophilicity, mechanical properties, catalytic activity, bioactivity). Additionally, new directions exploration have been indicated.

Language: Английский

Citations

7
Leveraging Long‐Life Alkaline Redox Flow Batteries Using Durable and High‐Hydroxide Exchange N‐Bridged Triazine Framework Membranes DOI Open Access
Jeet Sharma, Richa Gupta, Kothandaraman Ramanujam

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract Fluorine‐free organic framework polyelectrolyte membranes showing near frictionless ionic conductivities are gaining cognitive insights. However, the co‐precipitation of COFs in often brings trade‐offs to commission long‐life electrochemical energy storage solutions. Herein, a durable and ionically miscible dual‐ion exchange membrane based on triazine (TOF) is designed for alkaline redox flow batteries (RFB). Bearing dual ion‐exchange architectures, all‐hydrocarbon TOF‐based PEMs ( s TOF's) surpass fluorinated Nafion terms efficiency (>80%), density, peak power densities. The fabricated TOF's evidenced highest net >2.1 meq g −1 which encourages electrolyte utilization with ≈100% offers excellent capacities. Moreover, >97% efficiencies preserved, rate capability studies illustrate that, TOF‐5, RFB can operate at reduced overpotentials (η ≤200 mV) uplift life. supports successful demonstrations higher redoxolyte concentrations thereby multiplying afterlife performance TOF‐5 revealed equivalent fresh Nafion‐117 surpassed bearing >50% capacity after ≈3000 continuous cycles. With cell delivered (P max ) 2.3 W ≈60% than that = 1.45 W).

Language: Английский

Citations

0
An In-Depth Nmr Investigation of Thermoresponsive Unimer Micelles Loaded with the Highly Hydrophobic Antitumor Drug Ca-4 DOI
Andrea Cesari, Elisa Guazzelli, Ester Scaiella

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Fabrication and performance of the wide-band highly shielded polyvinylidene fluoride film DOI Creative Commons

Liwu Fu,

Jianfeng Hu, Peng Luo

et al.

Frontiers in Materials, Journal Year: 2025, Volume and Issue: 12

Published: Feb. 14, 2025

The white weathering layer materials that can effectively block the entire solar light band is of great importance for improving service life, safety, and reliability materials. In this work, CsxWO 3 @PDA was prepared by in situ polymerization to achieve high absorption full spectral range increase compatibility between particles polyvinylidene fluoride (PVDF). PVDF composite films with different particle contents were through compounding titanium dioxide (TiO 2 ) @PDA. characterized FT-IR, field emission scanning electron microscopy, universal material testing machine, whiteness meter, ultraviolet visible spectroscopy. results showed CsPVDF TiO exhibited a level higher than 74, transmittance less 5% wavelength 200–2500 nm, close zero below 1750 demonstrating excellent shielding effect. xenon lamp aging test also confirmed had weather resistance after 500 h. At same time, adding certain amount could improve tensile strength PVDF.

Language: Английский

Citations

0
Microwave-Assisted Oxidative Degradation of poly(vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene): Preparation, Characterization, and Reaction Mechanism DOI
Ranran Qi,

Ziwen Gan,

Qi Wang

et al.

Polymer Degradation and Stability, Journal Year: 2025, Volume and Issue: unknown, P. 111269 - 111269

Published: Feb. 1, 2025

Language: Английский

Citations

0
An In-Depth Nmr Investigation of Thermoresponsive Unimer Micelles Loaded with the Highly Hydrophobic Antitumor Drug Ca-4 DOI
Andrea Cesari, Elisa Guazzelli, Ester Scaiella

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
What Do We Know About Per- or Polyfluoroalkyl Substances (PFASs)? Issues, Challenges, Regulations, and Possible Alternatives DOI Creative Commons
Bruno Améduri

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Per- or polyfluoroalkyl substances (PFASs) are man-made compounds involved in compositions of many industrial processes and consumer products. They categorized into two main families based on their molar mass: though low mass products (<1000 Da) toxic, mobile, bioaccumulable, cross the human membranes, others much higher masses, e.g., fluorinated macromolecules especially fluoropolymers, safe reliable, do not face such concerns, membranes (hence, they regarded as Polymers Low Concern), applications including medical high-value-added materials devices. Because former family has led to a severe global contamination, recent regulating agencies Europe (REACH) USA (EPA) have aimed at restricting fluorochemicals. Recently, consultations from affected organisms industries more than 5600 answers comments. This review supplies an update overall situation PFASs, limitations, regulations, end life, degradations, possible alternatives.

Language: Английский

Citations

0
Suitable radicals and monomers to obtain innovative fluorinated polymers based on vinylidene fluoride and their applications DOI Creative Commons

Abdelatif Manseri,

Bruno Améduri

Comptes Rendus Chimie, Journal Year: 2025, Volume and Issue: 28(G1), P. 301 - 317

Published: March 21, 2025

Language: Английский

Citations

0