Ti3C2Tx MXene contained nanofluids with high thermal conductivity, super colloidal stability and low viscosity

Bao, Zhijie; Bing, Naici; Zhu, X.; Xie, Huaqing; Yu, Wei

doi:10.1016/j.cej.2020.126390

Cited by 79 publications

(39 citation statements)

References 44 publications

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“…In general, ζ-potential values between ±30 and ±40 mV are considered indicative of moderate electrostatic stability, while values above ±40 mV evidence the electrostatic stability of NPs. Consequently, ζ-potential is widely used as a criterion for estimating the colloidal stability/instability of NP dispersions. − …”

Section: Introductionmentioning

confidence: 99%

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

et al. 2021

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In this work, a set of experimental electrophoretic mobility (μe) data was used to show how inappropriate selection of the electrokinetic model used to calculate the zeta potential (ζ-potential) can compromise the interpretation of the results for nanoparticles (NPs). The main consequences of using ζ-potential values as criteria to indicate the colloidal stability of NP dispersions are discussed based on DLVO interaction energy predictions. For this, magnetite (Fe3O4) NPs were synthesized and characterized as a model system for performing electrokinetic experiments. The results showed that the Fe3O4 NPs formed mass fractal aggregates in solution, so the ζ-potential could not be determined under ideal conditions when μe depends on the NP radius. In addition, the Dukhin number (Du) estimated from potentiometric titration results indicated that stagnant layer conduction (SLC) could not be neglected for this system. The electrokinetic models that do not consider SLC grossly underestimated the ζ-potential values for the Fe3O4 NPs. The DLVO interaction energy predictions for the colloidal stability of the Fe3O4 NP dispersions also depended on the electrokinetic model used to calculate the ζ-potential. The results obtained for the Fe3O4 NP dispersions also suggested that, contrary to many reports in the literature, high ζ-potential values do not necessarily reflect high colloidal stability for charge-stabilized NP dispersions.

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Section: Introductionmentioning

confidence: 99%

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

et al. 2021

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“…From the XRD pattern of Nb 2 C, the sharp diffraction peaks originating from Nb 2 AlC precursor were greatly diminished in intensity, indicating a reduced crystallinity and the structural order. [ 31 ] The crystallinity of delaminated Nb 2 C NSs was calculated to be 26.67%. Besides, an intense peak corresponding to plane (103) disappeared, and the (002) peak position downshifted from 12.79° to 8.24°, confirming the successful exfoliation of Al and the obtained few‐layer Nb 2 C NSs (Figure 2b).…”

Section: Resultsmentioning

confidence: 99%

Tailored Hydrogel Delivering Niobium Carbide Boosts ROS‐Scavenging and Antimicrobial Activities for Diabetic Wound Healing

Chen

Liu

Cheng

et al. 2022

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cause of nontraumatic limb amputations, threatening patient health and quality of life. [1,2] Wound healing is a fascinatingly complex biological process. Traditionally, it is divided into four overlapping phases: hemostasis, inflammation, proliferation and remodeling. [3,4] Compared with the healing of other wounds, the healing of diabetic wounds gets stalled in the inflam matory phase, which is characterized by excessive production of reactive oxygen species (ROS), proinflammatory cytokines and proteases. [5,6] Excessive ROS produc tion cause irreversible oxidative damage to biomacromolecules (such as lipids, nucleic acids, and proteins) and the cells within the wound (such as endothelial cells, keratino cytes, and fibroblasts). This inhibits angiogenesis, granulation tissue forma tion, and wound healing. [7,8] The endo genous antioxidant system is inadequate to remove excessive ROS, and the use of exogenous antioxidants is recommended to prevent oxidative stress damage. With the rapid advancements in nanomedicine, numerous antioxidative nanomaterialsincluding melanin nanoparticles (NPs), metalbased nanomaterials (Au, Ag, Pt NPs), metal oxidebased nanomaterials (CeO 2 , Fe 3 O 4 , TiO 2 , alumina, SiO 2 ), [9,10] and quantum dots-are being used in wound dressing systems to scavenge excess ROS. [11] In addition to oxidative damage, bacterial infections also hinder diabetic wound healing. [12,13] Diabetic wounds are more prone to bacterial infection owing to impaired immune responses, and bacterial infections cause increased ROS pro duction and worsen the inflammatory response in wounds. [14,15] Bacteria easily acquire multidrug resistance owing to antibi otic misuse. Therefore, among various available antimicrobial therapies, photothermal therapy (PTT) has been attracting widespread attention. [16] In PTT, nearinfrared (NIR) laser irra diation is used to induce a local increase in temperature, which can damage bacterial cell membranes and denature bacterial proteins, thus causing bactericidal effects. [16,17] So far, a variety of nanomaterialbased photothermal agents have been incorpo rated into wound dressings to treat bacteriainfected wounds. [17] However, monotherapy with PTT may lead to additional local ROS production, thus delaying wound healing. Therefore, anThe treatment of diabetic wounds remains challenging due to the excess levels of oxidative stress, vulnerability to bacterial infection, and persistent inflammation response during healing. The development of hydrogel wound dressings with ideal anti-inflammation, antioxidant, and anti-infective properties is an urgent clinical requirement. In the present study, an injectable thermosensitive niobium carbide (Nb 2 C)-based hydrogel (Nb 2 C@Gel) with antioxidative and antimicrobial activity is developed to promote diabetic wound healing. The Nb 2 C@Gel system is composed of Nb 2 C and a PLGA-PEG-PLGA triblock copolymer. The fabricated Nb 2 C nanosheets (NSs) show good biocompatibility during in vitro cytotoxicity and hemocompatibility assays and in vivo t...

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“…Various previous studies have proven the structure, content, and morphological properties of nanoparticles effect thermal conductivity, rheological behavior, viscosity, and stability [ 62 ]. Regarding the morphology-dependent rheological behavior and intrinsic viscosity measurement of nanofluids rich in Ag NPs, the lack of data in the literature is noteworthy.…”

Section: Resultsmentioning

confidence: 99%

A sensitive and smartphone colorimetric assay for the detection of hydrogen peroxide based on antibacterial and antifungal matcha extract silver nanoparticles enriched with polyphenol

2021

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Current trends in scientific studies focus on the development of smartphone-based biosensors via green nanoparticle for clinical diagnosis, food, and environmental monitoring. In this study, we developed a novel portable smartphone-based biosensor via green dendrimer-coated matcha extract/silver nanoparticles (ME-Ag NPs) enriched with polyphenol for detecting hydrogen peroxide (H 2 O 2 ). Also, we investigated the biological evaluation of the nanostructure as a safe preservative for use in biomedical applications. Ag NPs were prepared using a green sonochemical method and were characterized to determine surface and chemical properties by different techniques such as scanning electron microscopy—energy-dispersive X-ray, transmission electron microscope, Fourier transform infrared spectroscopy, atomic force microscopy, X-ray diffraction, and Brunauer–Emmett–Teller. Furthermore, antimicrobial and antifungal properties of ME-Ag NPs were investigated against pathogenic microorganisms such as Staphylococcus aureus, Pseudomonas aureginosa, Escherichia coli, Candida albicans, and Aspergillus brasiliensis. The experimental sensor methodology was based on the detection of H 2 O 2 by analysis of images of novel silver nanostructure-coated papers and processing of color histograms with a RGB (red–green–blue) analyzer software. Consequently, the smartphone-based biosensor exhibited high sensitivity with detection limits of 0.82 μM response time of 5 s. The smartphone-based biosensor via ME-Ag NPs provided a rapid and selective detection of H 2 O 2 .

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Ti3C2Tx MXene contained nanofluids with high thermal conductivity, super colloidal stability and low viscosity

Cited by 79 publications

References 44 publications

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

Tailored Hydrogel Delivering Niobium Carbide Boosts ROS‐Scavenging and Antimicrobial Activities for Diabetic Wound Healing

A sensitive and smartphone colorimetric assay for the detection of hydrogen peroxide based on antibacterial and antifungal matcha extract silver nanoparticles enriched with polyphenol

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