Characterization of bubble formation in microfluidic fuel cells employing hydrogen peroxide

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

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A Simple, Green and Fast Ultraviolet Spectrophotometric Method for the Carbamide Peroxide Determination in Dental Whitening Products

Current Pharmaceutical Analysis ◽

10.2174/1573412913666171027164015 ◽

2019 ◽

Vol 15 (2) ◽

pp. 138-144

Author(s):

Fabiana Vieira Lima ◽

Aline Farias ◽

Cassiana Mendes ◽

Simone Gonçalves Cardoso ◽

Marcos Antônio Segatto Silva

Keyword(s):

Hydrogen Peroxide ◽

Pharmaceutical Products ◽

Reference Solution ◽

Iodometric Titration ◽

Carbamide Peroxide ◽

Ultraviolet Detection ◽

Water As Solvent ◽

Development And Validation ◽

Dental Whitening

Background: The carbamide peroxide is the most commonly active ingredient used for home dental whitening products, its quantification in pharmaceutical products is of extreme importance due to the relation with the products potency and the previously related low carbamide peroxide stability. Once, there is only one official carbamide peroxide determination based on iodometric titration, this method is time-consuming and generates a lot of residues. The aim of this study was to carry out development and validation of a simple and fast ultraviolet spectrophotometer assay to quantify an innovative dental whitening gel. Methods: The proposed method was validated according international conference on harmonization guideline. Procedure is based on the iodide/iodine redox chemistry; iodine released through the action of hydrogen peroxide of carbamide peroxide with ultraviolet detection at 350 nm. Results: The procedure was linear in the concentration range of 1.0-4.0 µg/mL, specific to the excipients, robust for the evaluated parameters (variation of wavelength (± 5 nm); reagent addition (± 10%)), showing the results of RSD 1.88 and 0.39% respectively. Repeatability precision was RSD = 1.42%, with accurate RSD = 2.15% by adding reference solution. The assay used only water as solvent for sample preparation. In comparison to the pharmacopeial method, the latter is more time-consuming, as it generates a lot of residues, and it could not quantify small CP dosages. Conclusion: Thus, the proposed method was proved to be suitable to determine carbamide peroxide during the development and characterization of nanoparticle formulations in the present study.

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Fabrication and Characterization of LaGaO3 Thin Film Electrolyte Solid Oxide Fuel Cells with Sr2Fe1.5Mo0.5O6-δ Electrode

Current Physical Chemistry ◽

10.2174/187794680503160223164844 ◽

2016 ◽

Vol 5 (3) ◽

pp. 188-194

Author(s):

Jing Qian ◽

Lei Bi ◽

Wei Liu

Keyword(s):

Thin Film ◽

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Solid Oxide ◽

Oxide Fuel ◽

Thin Film Electrolyte ◽

Film Electrolyte ◽

Fabrication And Characterization

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Characterization of one-step co-fired BaZr0.8Y0.2O3-δ-La2Ce2O7 composite electrolyte for low-temperature solid oxide fuel cells

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2021.04.025 ◽

2021 ◽

Author(s):

Hang Bao ◽

Ruijie Chen ◽

Xinrui Wang ◽

Yang Yang ◽

Tianqiang Lin ◽

...

Keyword(s):

Fuel Cells ◽

Low Temperature ◽

Solid Oxide Fuel Cells ◽

Solid Oxide ◽

Oxide Fuel ◽

Composite Electrolyte ◽

One Step

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Processing and characterization of novel Ce0.8Sm0.1Bi0.1O2-δ-BaCe0.8Sm0.1Bi0.1O3-δ (BiSDC-BCSBi) composite electrolytes for intermediate-temperature solid oxide fuel cells

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.11.227 ◽

2020 ◽

Author(s):

Hao Ding ◽

Xue Guo ◽

Jiao Li ◽

Qiangqiang Hu ◽

Haibin Sun ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Solid Oxide ◽

Intermediate Temperature ◽

Oxide Fuel ◽

Composite Electrolytes

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Synthesis and characterization of novel functionalized perarylated polysiloxane for proton exchange membrane fuel cells

MRS Advances ◽

10.1557/adv.2019.419 ◽

2019 ◽

Vol 4 (64) ◽

pp. 3579-3585

Author(s):

Guillermo M. González Guerra ◽

Alejandro Alatorre-Ordaz ◽

Gerardo González Garcia ◽

Jesus S. Jaime-Ferrer

Keyword(s):

Cyclic Voltammetry ◽

Fuel Cells ◽

Proton Exchange Membrane ◽

Area Under The Curve ◽

Chlorosulfonic Acid ◽

Proton Exchange ◽

Synthesis And Characterization ◽

A Value ◽

Exchange Membrane

ABSTRACTThis work presents the synthesis and characterization of a pearylated polysiloxane material (PAP) from a polycondensation reaction, followed by functionalization with HClSO3 by an electrophilic substitution reaction. According to the characterization techniques applied, a sulfonated pearylated polysiloxane was also obtained, (SPAP). The purpose of this sulfonated material is to obtain an ionomer able to be applied in hydrogen fuel cells of the proton exchange membrane kind (PEMFC). The reaction to produce the polysiloxane precursor was carried out with the commercial reagents: PhSiCl3, Ph2SiCl2 and Ph3SiCl in anhydrous THF at 75 °C and the SPAP material was obtained by sulfonation of the precursor with chlorosulfonic acid. PAP and SPAP were characterized by 1H, NMR for liquids, 29Si NMR for solids, IR-ATR, SEM, and cyclic voltammetry. The NMR 29Si spectra show that PAP and PAPS contain crosslinking regions due to PhSiCl3, growing chain zones due to Ph2SiCl2 and polymer termination zones due to Ph3SiCl, obtaining a mixture of siloxanes. The analysis by cyclic voltammetry indicates that by integrating the area under the curve of the adsorption peaks of H2, a value of 0.062 mC/cm2 is obtained, a value close to the commercial ionomer of Nafion®.

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