Asymmetric polysiloxane-based SiOC membranes produced via phase inversion tape casting process

Fontão, Natália C.; Wilhelm, Michaela; Rezwan, Kurosch

doi:10.1016/j.matdes.2020.109328

Cited by 11 publications

(7 citation statements)

References 51 publications

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“…The contact angle changed from 90.3 to 85.2° after pyrolysis of the parylene-C film. Such an increase in hydrophilicity was explained by the production of oxygen species on the surface, as revealed by the FTIR and XPS analyses. , The roughness ( R q ) was observed to be decreased from 8.6 nm to 0.6 nm, which indicated the change of the crystalline structure of parylene-C to amorphous carbon, as revealed by XRD analysis. , The electrochemical properties of the pyrolyzed carbon electrode were estimated for the apparent electron transfer rate ( k app ), double-layer capacitance ( C dl ), and electrochemical window. The apparent rate constant for electron transfer ( k app ) was estimated according to the Nicholson method , as shown in Figure S2a.…”

Section: Resultsmentioning

confidence: 93%

Electrochemical One-Step Immunoassay Based on Switching Peptides and Pyrolyzed Carbon Electrodes

et al. 2022

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Switching peptides were designed to bind reversibly to the binding pocket of antibodies (IgG) by interacting with frame regions (FRs). These peptides can be quantitatively released when antigens bind to IgG. As FRs have conserved amino acid sequences, switching peptides can be used as antibodies for different antigens and different source animals. In this study, an electrochemical one-step immunoassay was conducted using switching peptides labeled with ferrocene for the quantitative measurement of analytes. For the effective amperometry of the switching peptides labeled with ferrocene, a pyrolyzed carbon electrode was prepared by pyrolysis of the parylene-C film. The feasibility of the pyrolyzed carbon electrode for the electrochemical one-step immunoassay was determined by analyzing its electrochemical properties, such as its low double-layer capacitance (C dl ), high electron transfer rate (k app ), and wide electrochemical window. In addition, the factors influencing the amperometry of switching peptides labeled with ferrocene were analyzed according to the hydrodynamic radius, the number of intrahydrogen bonds, dipole moments, and diffusion coefficients. Finally, the applicability of the electrochemical one-step immunoassay for the medical diagnosis of the human hepatitis B surface antigen (hHBsAg) was assessed.

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Section: Resultsmentioning

confidence: 93%

Electrochemical One-Step Immunoassay Based on Switching Peptides and Pyrolyzed Carbon Electrodes

et al. 2022

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“…The highest and lowest values regarding the pure water permeability were 11,017 and 14.3 L m −2 h −1 bar −1 , respectively. Fontão et al [ 51 ] prepared polysiloxane-based SiOC membranes produced via a phase inversion tape casting process. The values regarding water permeation flux were between 6 and 55 m 3 m −2 h −1 at 3 bar operating pressure.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Polyamide-6 Membranes—The Effect of Gelation Time towards Their Morphological, Physical and Transport Properties

2022

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Porous polyamide-6 membranes were fabricated via a non-solvent induced phase inversion method, and the influence of gelation time on the properties of the membranes was investigated. Membrane samples with various gelation times were prepared. The evaluation of the membranes’ properties was carried out by various analyses and tests, such as scanning electron microscopy, atomic force microscopy, contact angle, wet and dry thickness, mean pore size measurements, porosity, water uptake, mechanical resistance, hydrodynamic water fluxes, membrane hydrodynamic permeability, and retention testing. The scanning electron microscopy images (both surface and cross-section) demonstrated that the increase in gelation time from 0 (M0) to 10 (M10) min led to the morphological change of membranes from isotropic (M0) to anisotropic (M10). The wet and dry thickness of the membranes showed a downward tendency with increasing gelation time. The M0 membrane exhibited the lowest bubble contact angle of 60 ± 4° and the lowest average surface roughness of 124 ± 22 nm. The highest values of mean pore size and porosity were observed for the M0 sample (0.710 ± 0.06 µm and 72 ± 2%, respectively), whereas the M10 membrane demonstrated the highest tensile strength of 4.1 MPa. The membrane water uptake was diminished from 62 to 39% by increasing the gelation time from 0 to 10 min. The M0 membrane also showed the highest hydrodynamic water flux among the prepared membranes, equal to 28.6 L m−2 h−1 (at Δp = 2 bar).

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“…As was already shown in the TGA analysis, the decomposition of the organic groups (phenyl and methyl) of preceramic polymers H44 and MK starts above 500 • C. In the samples pyrolyzed at 600 • C, the remaining functional groups provided a more hydrophobic character than in the samples pyrolyzed at higher temperatures, as the material loses its organosilicon character. Previous works [25,44,53] using the same preceramic polymers (with or without ceramer fillers) clearly demonstrated the hydrophobicity of materials pyrolyzed at temperatures of 600 • C by a water-to-heptane ratio of significantly <1. This indicates that not only the pyrolysis temperature but also the filler nature can play a role in the surface character of the produced samples.…”

Section: Adsorption and Photocatalytic Activitymentioning

confidence: 86%

Influence of the Pyrolysis Temperature and TiO2-Incorporation on the Properties of SiOC/SiC Composites for Efficient Wastewater Treatment Applications

et al. 2022

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This study focuses on the development of porous ceramer and SiOC composites which are suitable for microfiltration applications, using a mixture of polysiloxanes as the preceramic precursor. The properties of the membranes—such as their pore size, hydrophilicity, specific surface area, and mechanical resistance—were tailored in a one-step process, according to the choice of pyrolysis temperatures (600–1000 °C) and the incorporation of micro- (SiC) and nanofillers (TiO2). Lower pyrolysis temperatures (<700 °C) allowed the incorporation of TiO2 in its photocatalytically active anatase phase, enabling the study of its photocatalytic decomposition. The produced materials showed low photocatalytic activity; however, a high adsorption capacity for methylene blue was observed, which could be suitable for dye-removal applications. The membrane performance was evaluated in terms of its maximum flexural strength, water permeation, and separation of an oil-in-water emulsion. The mechanical resistance increased with an increase of the pyrolysis temperature, as the preceramic precursor underwent the ceramization process. Water fluxes varying from 2.5 to 370 L/m2·h (2 bar) were obtained according to the membrane pore sizes and surface characteristics. Oil-rejection ratios of 81–98% were obtained at an initial oil concentration of 1000 mg/L, indicating a potential application of the produced PDC membranes in the treatment of oily wastewater.

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Asymmetric polysiloxane-based SiOC membranes produced via phase inversion tape casting process

Cited by 11 publications

References 51 publications

Electrochemical One-Step Immunoassay Based on Switching Peptides and Pyrolyzed Carbon Electrodes

Electrochemical One-Step Immunoassay Based on Switching Peptides and Pyrolyzed Carbon Electrodes

Fabrication of Polyamide-6 Membranes—The Effect of Gelation Time towards Their Morphological, Physical and Transport Properties

Influence of the Pyrolysis Temperature and TiO2-Incorporation on the Properties of SiOC/SiC Composites for Efficient Wastewater Treatment Applications

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