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Taken together, our findings suggest that graphene and PLA-graphene do not possess a negative effect on the feeding activity, reproduction and overall lifespan of the host, indicating that these materials are safe to living organism at concentration up to 1000 µg/mL.
This study demonstrates that low levels of graphene and GO are not environmentally safe since they can significantly make cell more susceptible to other xenobiotics, and this chemosensitizing activity should be considered in the risk assessment of graphene and GO.
Moreover, carbon nanotubes and graphene are environmentally friendly and safe.
A large graphene sheet is generally stable and inert; thus, graphene and its derivatives are not considered hazardous, but good laboratory practices should be taken seriously for the safe handling and use of such materials.
Graphene is a nanomaterial with many promising and innovative applications, yet early studies indicate that graphene may pose risks to humans and the environment.
A certain number of in vitro studies has indicated cytotoxic effects of graphene while the other show that it is safe.
Journal ArticleDOI
Ruquan Ye, James M. Tour 
17 Sep 2019-ACS Nano
87 Citations
To achieve an influential impact on society, graphene must be manufactured at large scales, be superior to existing products, and be safe to use.
Knowledge about graphene-based materials could ensure the safe application of this versatile material.
“Graphene membranes” can serve not only for the separation of different gases but find a main use in the supply of safe drinking water to all countries.
HIGHLIGHTSReduced Graphene Oxide & Graphene Oxide can cause potential environmental hazards. Mechanism of ocular toxicity of the materials is complex but not to be identified. Short‐term exposure tests indicate: Graphene Oxide has apparent ocular toxicity.

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How do carbon quantum dots improve the efficiency and performance of triboelectric materials?
5 answers
Carbon quantum dots (CQDs) play a crucial role in enhancing the efficiency and performance of various materials. In the context of triboelectric materials, CQDs have been utilized to improve functionality. For instance, in the field of triboelectric nanogenerators (TENGs), graphene-based composite electrodes, doped graphene electrodes, and laser-induced graphene (LIG) electrodes have been explored to enhance TENG performance significantly. Similarly, in flexible piezoelectric sensors (FPS), the introduction of CQDs into polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) films has shown improved piezoelectric performance, sensitivity, and stability, enabling applications like anti-touch alarm systems and vibration monitoring. Overall, the unique properties of CQDs, such as their large specific surface area, surface defects, and functional groups, contribute to enhancing the efficiency and performance of triboelectric materials in various applications.
Why the intensity of x-ray peak increases with doping while the other xrd peaks are absent?
5 answers
The intensity of the x-ray peak increases with doping due to the presence of short-range charge order (CO) in the material. This phenomenon is observed in electron-doped cuprates, where the CO peak intensity rises with decreasing carrier doping until a certain point, after which it is suppressed due to strong damping. The absence of other XRD peaks can be attributed to the specific structural changes induced by doping. For instance, in the case of Fe-doped zirconia, the substitution of Zr with Fe atoms leads to a significant change in the XANES spectrum, indicating a rearrangement of the crystal structure. Similarly, in Mn-doped ZnO nanoparticles, the lattice parameter slightly increases with doping, affecting the XRD pattern. These structural modifications and charge redistributions contribute to the observed changes in x-ray peak intensity.
What is the purpose of em shielding in nano materials epoxy composites?
5 answers
The purpose of electromagnetic interference (EMI) shielding in nano-materials epoxy composites is to provide effective protection against electromagnetic pollution and heat accumulation in highly integrated electronic equipment. These composites are designed to exhibit high thermal conductivity, mechanical strength, and EMI shielding effectiveness (SE). By incorporating materials like graphene, nickel-cobalt alloy, ferrite nano-powder, and bidirectional aligned Ti3C2Tx@Fe3O4 into epoxy matrices, the resulting composites offer enhanced EMI SE values, reaching up to 85 dB, 34.62 dB, and 79 dB. Additionally, these materials demonstrate improved phonon propagation efficiency, thermal stability, and mechanical properties, making them ideal for applications requiring reliable EMI shielding, such as in electronic equipment for various industries.
How to select cheese?
5 answers
To select cheese, consider various methods outlined in the research papers. Firstly, choose mature cheeses with a fat content of at least 50%, excluding cheese spreads, for specific treatments like mechanical shaping. Additionally, for cheese making, add compounds like carraghenates, gelatine, guar, carob, or xanthane before coagulation to enhance homogeneity and freshness of the paste. When collecting cheese samples, take wedges or plugs depending on the cheese type, ensuring representativeness. For making low-fat cheese products, disperse gelatin solutions into ultrafiltered milk, maintain a non-gelling temperature, and control pH during ripening to achieve desired fat content. Lastly, use a cheese direction screening device with rotating rollers to screen cheeses in different directions for efficient selection.
How does fe2 react with s2-?
5 answers
Fe2 can react with S2- to form various compounds and complexes with distinct properties. Research indicates that Fe2 can form diferrous disulfides lacking an S-S bond, and the interconversion between different valence isomers is symmetry-forbidden. Additionally, the reactivity of sulfur dioxide (SO2) with iron oxide cationic clusters suggests that Fe2O2 clusters can interact with SO2, forming association products. Furthermore, iron sulfide dimers (FeS)2 and their persulfide isomers exhibit different stability and reactivity patterns. The persulfide isomers with S-S bonds are more stable in hexacarbonyl complexes, inducing high electron density in the Fe2S2 core. These findings collectively highlight the diverse reactivity and complex formation between Fe2 and S2-, showcasing the intriguing chemistry of iron-sulfur systems.
What are the material advancement in 3D printing concrete?
5 answers
Material advancements in 3D printing concrete (3DPC) include the use of waste materials as supplementary cementitious materials (SCMs) to enhance rheology, although excessive use can reduce early strength. Lightweight aggregates like cenospheres, perlite, and foam beads have been explored to improve printing and mechanical performances, with optimized mixtures showing enhanced flow characteristics and specific compressive strength. Carbon-based nanomaterials (CBNs) such as graphene and carbon nanotubes have been studied for their potential to modify concrete properties at a molecular level, offering high-performance printable materials for 3D concrete printing (3DCP). Additionally, the Gradation-Ready Extrusion System (GRES) has been developed to produce graded, multi-material building components, allowing for variations in material properties within a single component, thus expanding the potential applications of 3D concrete printing.
What are the advantages of integrating 2D van der Waal heterostructures on silicon substrate?
5 answers
Integrating 2D van der Waals heterostructures on a silicon substrate offers several advantages. These heterostructures can be electrostatically programmed in nanoseconds, significantly faster than other 2D-based homojunctions. Additionally, the integration enhances the response of photocurrent in silicon-based PN junction photodetectors, leading to increased photoresponsivity and photocurrent gain, along with a higher optical I on /I off ratio. Moreover, the monolithic 3D integration of 2D materials on silicon platforms enables high current driving capability with low leakage, nonvolatile switching characteristics, and a tunable bandgap, crucial for various electronic applications like transistors, memory devices, and sensors. Overall, this integration showcases the potential for transformative multifunctional electronic devices, paving the way for advancements beyond traditional silicon-based systems.
Why subnanomaterials are important in Oxygen evolution reaction?
5 answers
Subnanomaterials play a crucial role in the Oxygen Evolution Reaction (OER) due to their unique properties that differ from conventional nanomaterials. These materials exhibit enhanced catalytic activity and efficiency in OER applications. For instance, the synthesis of ultrathin nanosheets with a thickness of 0.9 nm induced by Mn incorporation has shown remarkable OER electrocatalysis performance with low overpotential and long-term stability. Similarly, the operando X-ray absorption spectroscopy study on CoOx(OH)y nanoparticles revealed size-dependent catalytic activity down to 1 nm, highlighting the superior intrinsic OER activity of sub-5 nm nanoparticles. These findings emphasize the significance of subnanomaterials in advancing OER catalysts by providing insights into their structural adaptations, active site evolution, and surface chemistry, ultimately contributing to the development of efficient and sustainable electrocatalysts for water electrolysis.
Why industrial method used for yogurt preparation?
5 answers
Industrial methods are utilized for yogurt preparation to enhance efficiency, reduce costs, and improve product quality. These methods involve various techniques such as enzymatic hydrolysis of milk proteins, filtration, pasteurization, and homogenization of milk to remove impurities and standardize fat content, degradation of lactose using lactase enzyme to achieve specific concentrations in the final product, and the addition of ingredients like sweeteners, collagen, modified starch, and pectin to enhance texture, taste, and stability of the yogurt. Additionally, industrial yogurt fermentation devices are designed to create optimal conditions for fermentation, ensuring nutrient-rich and easily absorbable yogurt suitable for diverse consumer needs. Overall, industrial methods streamline production processes, improve product consistency, and meet the demands of mass production in the dairy industry.
Why industrial method better than traditional method for yogurt preparation?
5 answers
The industrial method is considered better than the traditional method for yogurt preparation due to several reasons. Industrial yogurt samples exhibit higher values of hardness, adhesiveness, gumminess, and chewiness compared to traditional yogurt samples, which may be attributed to differences in processing steps, raw milk composition, incubation time, and storage conditions. Additionally, industrial methods can ensure the preservation of more probiotics, resulting in a longer shelf life and improved taste of the yogurt powder. Furthermore, industrial production using specific cultures like mesophilic homofermentative cultures can lead to longer shelf life and better quality yogurt compared to traditional cultures. Overall, the industrial method offers advantages in texture, probiotic content, and shelf life, making it a preferred choice for yogurt preparation.
Who works on neuronal Calcium?
5 answers
Researchers across various studies have delved into the realm of neuronal calcium signaling. Studies have highlighted the significance of calcium channels in regulating processes like neurotransmitter release and neuronal outgrowth. Novel technologies, such as the Split TEV, Ca2+ Activated Neuron Recorder (SCANR), have been developed to investigate neural signaling through engineered Ca2+-sensing enzymes. A quantitative study proposed a method to determine calcium conductance density in neurons by inferring calcium current density from concentration measurements, shedding light on the role of calcium as a second messenger in modulating neuronal excitability. Furthermore, calcium imaging techniques have been utilized to visualize subcellular Ca2+ dynamics in vivo, offering insights into how Ca2+ handling influences neuronal function and plasticity. These collective efforts underscore the interdisciplinary collaboration among scientists exploring the intricate world of neuronal calcium signaling.