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

An in-depth NMR investigation of thermoresponsive unimer micelles loaded with the highly hydrophobic antitumor drug CA-4 DOI Creative Commons
Andrea Cesari, Elisa Guazzelli, Ester Scaiella

et al.

Polymer Testing, Journal Year: 2025, Volume and Issue: unknown, P. 108784 - 108784

Published: April 1, 2025

Language: Английский

Citations

0
From fluorine’s position in the periodic table to PFAS environmental issues DOI Creative Commons
Marie Pierre Krafft

Comptes Rendus Chimie, Journal Year: 2025, Volume and Issue: 28(G1), P. 423 - 438

Published: April 16, 2025

PFASs have become a global pollution issue. These anthropogenic and unusually stable chemicals been in use since the 1940s. Thousands of them, whether molecular or polymeric, developed are found innumerable industrial processes consumer products. Multiple air water pathways ensure their dissemination when released into environment. They can adhere to rock sediment, concrete, tarmac, asphalt. Humans, animals, plants thus exposed through air, dust, soil, diet, drinking water, wastewater. Some identified as very persistent environment, bioaccumulative, toxic by public health authorities. This review emphasizes that specific outstanding properties C–F bond derive directly from fluorine’s position periodic table. Fluorinated surfactants also capacity form large, exceptionally sturdy supramolecular self-assemblies aqueous solutions, on solid surfaces at liquid interfaces. behavior may impact fate PFAS pollutants well remediation procedures, fact has so far barely recognized. Finding alternatives fluorinated fluoropolymers deliver comparably high performances while reducing environmental biological be extremely challenging. The essential concept distinguishes uses for which, current state, hardly find any replacement product capable matching demanded those which lesser performance is sufficient attainable otherwise, not speak downright futile. need discerning, eco-responsible accentuated if we want continue benefit unmatchable performances.

Language: Английский

Citations

0
Impact of Thermal and Ultraviolet Treatments on the Structural, Mechanical, and Laser Ablation Properties of Fluorinated Ethylene Propylene Films DOI Creative Commons
Brigita Abakevičienė, Algirdas Lazauskas, V. Grigaliūnas

et al.

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(9), P. 4796 - 4796

Published: April 25, 2025

Fluorinated ethylene propylene (FEP) films were subjected to heat, UV, and heat–UV treatments. Structural changes that occurred after these treatments recorded via X-ray diffraction (XRD), microtensile, laser ablation testing. XRD macromolecular orientation texture analysis revealed in the fraction of crystalline components degree anisotropy FEP being different processing conditions. Heat treatment at 200 °C affected structural properties by rearranging crystallites resulting a higher anisotropy. By contrast, UV resulted lower The crystallinity significantly their Young’s modulus yield stress. threshold values found be for heat-treated films.

Language: Английский

Citations

0
Electrowetting-on-dielectric behavior of aqueous droplets and gold nanofluid on an electrospun poly(vinyl chloride) microfiber layer DOI Creative Commons
Marco Laurence M. Budlayan, Jonathan N. Patricio,

Susan D. Arco

et al.

Materials Research Express, Journal Year: 2024, Volume and Issue: 11(3), P. 035303 - 035303

Published: March 1, 2024

Abstract Morphology and wettability of dielectric layers are crucial properties that affect the electrowetting-on-dielectric (EWOD) performance a working liquid. In this work, use poly(vinyl chloride) (PVC) microfiber-modified PVC layer as an substrate is explored. Imaging with scanning electron atomic force microscopy revealed intertwined microfibers on original film after deposition via electrospinning. Hydrophobicity was enhanced by presence microfibers, contact angle (CA) for water droplet increasing from 84.9° to 123.9°. EWOD behavior various liquids investigated within DC voltage range 0 200 V DC. Gold nanofluid exhibited largest change in CA 57°, while smaller changes were observed KOH (19.6°), KCl (21.2°), (21°). A mechanism explaining reduction gold presented. Our results suggest promising potential film-PVC microfiber hydrophobic material applications involving diverse liquids, including nanofluids.

Language: Английский

Citations

3
TFE Terpolymers: Once Promising – Are There Still Perspectives in the 21st Century: Synthesis, Characterization, and Properties‐Part I DOI Open Access
Salim Ok, Martin Steinhart, Ulrich Scheler

et al.

Macromolecular Rapid Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 6, 2024

Polytetrafluoroethylene (PTFE) exhibits outstanding properties such as high-temperature stability, low surface tension, and chemical resistance against most solvents, strong acids, bases. However, these traits make it challenging to subject PTFE standard polymer processing procedures, thermoforming hot incremental forming. While at temperatures above the melting point of is already demanding, typically large molar mass results in extremely high melt viscosities, complicating PTFE. Also, tends decompose close its point. Therefore, fluoropolymers obtained by copolymerizing tetrafluoroethylene (TFE) with various co-monomers are studied alternatives (e.g., fluorinated ethylene-propylene (FEP)), combining advantages better processability. TFE terpolymers have emerged desirable alternatives. This review provides an overview synthesis comonomers microstructural analysis relationships between microstructures their properties.

Language: Английский

Citations

3
Preparation of surface-active carbon dots with fluorocarbon and hydrocarbon hybrid chains via a one-pot solvothermal technique and their characterization and potential applications DOI
Yan Wang,

Shuang Zhuang,

Weiguang Chen

et al.

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: 684, P. 133155 - 133155

Published: Jan. 5, 2024

Language: Английский

Citations

2
Supercritical CO2 technology for the treatment of end-of-life lithium-ion batteries DOI Creative Commons
Pietro Cattaneo,

Fiorenza D'aprile,

Valeriy Kapelyushko

et al.

RSC Sustainability, Journal Year: 2024, Volume and Issue: 2(6), P. 1692 - 1707

Published: Jan. 1, 2024

Supercritical fluid technology is a promising approach for sustainable and efficient resource recovery (especially fluorinated binders electrolytes) from end-of-life lithium ion batteries with significant economic environmental perspectives.

Language: Английский

Citations

2
Novel Non-Fluorinated Surfactants for Emulsion Polymerization of Fluorinated Monomers DOI

Yangtian Lu,

Weiwei Zhu,

Yu‐Song Wu

et al.

Polymer, Journal Year: 2024, Volume and Issue: 311, P. 127520 - 127520

Published: Aug. 19, 2024

Language: Английский

Citations

2
Fluorinated compounds in paper and paperboard based food packaging materials DOI Creative Commons
Susana Guzmán‐Puyol

npj Science of Food, Journal Year: 2024, Volume and Issue: 8(1)

Published: Oct. 23, 2024

Paper- and paperboard-based materials are alternatives to petroleum-based plastics in food packaging but unsuitable for their poor moisture oil resistance. In this sense, fluorinated compounds improve water grease repellency, though use is controversial. This Perspective discusses main techniques combine with paper paperboard, including contact angles resistance values, summarizes legal aspects Europe the United States.

Language: Английский

Citations

2
Transformative Dynamics: Self-Assembly of Iron Oxide Hydroxide Nanorods into Iron Oxide Microcubes for Enhanced Perfluoroalkyl Substance Remediation DOI

Novuhulu Rhakho,

Manav Saxena, Nihar Pradhan

et al.

Langmuir, Journal Year: 2024, Volume and Issue: 40(19), P. 10184 - 10194

Published: May 3, 2024

We report the controlled synthesis of iron oxide microcubes (IOMCs) through self-assembly arrays ferric hydroxide nanorods (NRs). The formation IOMCs involves a complex interplay nucleation, self-assembly, and growth mechanisms influenced by time, thermal treatment, surfactant dynamics. vertically aligned NRs into is dynamic magnetism properties capping agents like cetyltrimethylammonium bromide (CTAB), whose concentration temperature modulation dictate kinetics structural uniformity. These growths were obtained via hydrothermal process at 120 °C various intervals 8, 16, 24, 32 h in presence CTAB as agent. In this method, oriented NR was observed without ligands, binders, harsh drying techniques, solvent evaporation. to with an increase saturated magnetization attain most stable state. synthesized have uniform size, quasi-shape, excellent dispersion. Due its magnetic catalytic properties, employed remove emerging pollutants known per- polyfluorinated substances (PFAS). Various microscopic spectroscopic techniques for characterization interaction studies PFAS. between perfluoroalkyl (PFAS) investigated, revealing strong adsorption tendencies facilitated electrostatic interactions, evidenced UV–vis FT-IR studies. Furthermore, higher positive surface charge responsible effective remediation eliminating any secondary pollution ease recovery after sorption studies, thereby making it practically worthwhile.

Language: Английский

Citations

1