High-permeability graphene oxide and poly(vinyl pyrrolidone) blended poly(vinylidene fluoride) membranes: Roles of additives and their cumulative effects

Tran, Thi Tuong Van; Kumar, Selvaraj Rajesh; Nguyễn, Chí Hiếu; Lee, Jing Wen; Tsai, Hui-An; Hsieh, Chia-Hsun; Lue, Shingjiang Jessie

doi:10.1016/j.memsci.2020.118773

Cited by 32 publications

(8 citation statements)

References 76 publications

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“…As the GO content in the formulations increases, the ζ-potential appears to increase linearly, reaching 0.4 mV for 27.5% (v/v). This effect was distinct from that reported in the literature, where the GO incorporation into polyvinylidene difluoride (PVDF), PVDF/poly(vinyl pyrrolidone), poly(vinyl alcohol), and chitosan leads to a decrease in the polymers’ ζ-potential due to the contribution of the negative charge of GO. In pHEMA, HEMA monomers can adsorb onto the GO surface, implying that HEMA covers GO before hydrogel polymerization.…”

Section: Resultscontrasting

confidence: 92%

“…These morphological features are specific to oxidized forms of graphene materials, since the presence of oxygen-containing groups in the platelets promotes the establishment of hydrogen bonds with each other and/or with water molecules, which leads to platelet folding and/or an improved dispersion, respectively. GO has a ζ-potential of −33.0 ± 1.3 mV, which is typical for the oxidized forms of graphene . This negative charge is related to the strong presence of oxygen-containing groups on the GO sheets, particularly carboxyl groups that tend to deprotonate in aqueous media.…”

Section: Resultsmentioning

confidence: 99%

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Tailoring the Electron Trapping Effect of a Biocompatible Triboelectric Hydrogel by Graphene Oxide Incorporation towards Self-Powered Medical Electronics

Pereira

Rodrigues

Silva

et al. 2023

ACS Biomater. Sci. Eng.

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Triboelectric nanogenerators (TENGs) are associated with several drawbacks that limit their application in the biomedical field, including toxicity, thrombogenicity, and poor performance in the presence of fluids. By proposing the use of a hemo/biocompatible hydrogel, poly(2-hydroxyethyl methacrylate) (pHEMA), this study bypasses these barriers. In contact− separation mode, using polytetrafluoroethylene (PTFE) as a reference, pHEMA generates an output of 100.0 V, under an open circuit, 4.7 μA, and 0.68 W/m 2 for an internal resistance of 10 MΩ. Our findings unveil that graphene oxide (GO) can be used to tune pHEMA's triboelectric properties in a concentration-dependent manner. At the lowest measured concentration (0.2% GO), the generated outputs increase to 194.5 V, 5.3 μA, and 1.28 W/m 2 due to the observed increase in pHEMA's surface roughness, which expands the contact area. Triboelectric performance starts to decrease as GO concentration increases, plateauing at 11% volumetric, where the output is 51 V, 1.76 μA, and 0.17 W/m 2 less than pHEMA's. Increases in internal resistance, from 14 ΩM to greater than 470 ΩM, ζ-potential, from −7.3 to −0.4 mV, and opencircuit characteristic charge decay periods, from 90 to 120 ms, are all observed in conjunction with this phenomenon, which points to GO function as an electron trapping site in pHEMA's matrix. All of the composites can charge a 10 μF capacitor in 200 s, producing a voltage between 0.25 and 3.5 V and allowing the operation of at least 20 LEDs. The triboelectric output was largely steady throughout the 3.33 h durability test. Voltage decreases by 38% due to contact−separation frequency, whereas current increases by 77%. In terms of pressure, it appears to have little effect on voltage but boosts current output by 42%. Finally, pHEMA and pHEMA/GO extracts were cytocompatible toward fibroblasts. According to these results, pHEMA has a significant potential to function as a biomaterial to create bio/hemocompatible TENGs and GO to precisely control its triboelectric outputs.

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Section: Resultscontrasting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Tailoring the Electron Trapping Effect of a Biocompatible Triboelectric Hydrogel by Graphene Oxide Incorporation towards Self-Powered Medical Electronics

Pereira

Rodrigues

Silva

et al. 2023

ACS Biomater. Sci. Eng.

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“…They demonstrated the hydrophilic, separation, and antifouling properties of the membrane and the change in membrane pore structure under a DC electric field. Research in recent years has shown that the incorporation of GO can significantly enhance the permeability and separation properties of membranes. − Lee et al prepared a GO/polysulfone (PSF) composite membrane by mixing GO and PSF casting solution using the phase-inversion method. It was found that the addition of 1 wt % of GO resulted in the preparation of new membranes, and the addition of GO resulted in better resistance to contamination and better hydrophilic properties.…”

Section: Preparation Methods Of Go-based Membranesmentioning

confidence: 99%

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Yang

Xiao

Shen

et al. 2022

ACS Appl. Nano Mater.

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Advanced membrane separation technology plays an important role in achieving excellent water treatment, which can help solve the freshwater crisis. However, there remains a trade-off between membrane permeability and selectivity. An emerging candidate to address this issue is graphene oxide (GO), a two-dimensional (2D) laminated graphene derivative with abundant oxygen functional groups. Furthermore, the transport channels of GO-based membranes can be artificially modified and manipulated, exhibiting great promise for GO in the field of water purification and molecular separation. This review comprehensively summarizes the research advances on 2D GO-based membranes for high-performance nanofiltration (NF). It begins with an elaboration on the preparation methods of GO-based membranes, followed by a detailed summary of the chemical modification and physical manipulation of transport channels. Then we reviewed the current research progress of theoretical calculation and molecular dynamics simulation. Also, the high NF performance of GO-based membranes is presented. Finally, the remaining challenges and future prospects in order to develop advances in membrane technology are provided.

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“…The surface charge of nanometric GO was calculated as -38 mV due to the ionization of carboxylic acid groups and the formation of a stable aqueous dispersion [28]. In our previous report, the prepared GO exhibited a negative surface charge (from −35.7 to −22.4 mV) throughout a wide pH range (pH of 11.5-2.4) [37]. Raman spectroscopy was further used to examine the chemical structure of the carbonbased nanomaterials and their ID/IG ratio (Figure 3c).…”

Section: Surface Morphology and Structural Analysismentioning

confidence: 97%

Graphene Oxide-Induced Protein Conformational Change in Nasopharyngeal Carcinoma Cells: A Joint Research on Cytotoxicity and Photon Therapy

et al. 2021

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The objectives of this work aim to investigate the interaction and cytotoxicity between nanometric graphene oxide (GO) and nasopharyngeal carcinoma cells (NPC-BM1), and possible application in photon therapy. GO nanosheets were obtained in the size range of 100–200 nm, with a negative surface charge. This nanometric GO exhibited a limited (<10%) cytotoxicity effect and no significant dimensional change on NPC-BM1 cells in the tested GO concentration range (0.1–10 µg·mL−1). However, the secondary protein structure was modified in the GO-treated NPC-BM1 cells, as determined through synchrotron radiation-based Fourier transform infrared microspectroscopy (SR-FTIRM) mapping. To further study the cellular response of GO-treated NPC-BM1 cancer cells at low GO concentration (0.1 µg·mL−1), photon radiation was applied with increasing doses, ranging from 2 to 8 Gy. The low radiation energy (<5 Gy) did not cause significant cell mortality (5–7%). Increasing the radiation energy to 6–8 Gy accelerated cell apoptosis rate, especially in the GO-treated NPC-BM1 cells (27%). This necrosis may be due to GO-induced conformational changes in protein and DNA/RNA, resulting in cell vulnerability under photon radiation. The findings of the present work demonstrate the potential biological applicability of nanometric GO in different areas, such as targeted drug delivery, cellular imaging, and radiotherapy, etc.

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High-permeability graphene oxide and poly(vinyl pyrrolidone) blended poly(vinylidene fluoride) membranes: Roles of additives and their cumulative effects

Cited by 32 publications

References 76 publications

Tailoring the Electron Trapping Effect of a Biocompatible Triboelectric Hydrogel by Graphene Oxide Incorporation towards Self-Powered Medical Electronics

Tailoring the Electron Trapping Effect of a Biocompatible Triboelectric Hydrogel by Graphene Oxide Incorporation towards Self-Powered Medical Electronics

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Graphene Oxide-Induced Protein Conformational Change in Nasopharyngeal Carcinoma Cells: A Joint Research on Cytotoxicity and Photon Therapy

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