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Open accessJournal ArticleDOI
Yin Zhang, Tapas R. Nayak, Hao Hong, Weibo Cai 
14 Jun 2012-Nanoscale
474 Citations
Although literature reports have mixed findings, we emphasize that the key question is not how toxic graphene itself is, but how to modify and functionalize it and its derivatives so that they do not exhibit acute/chronic toxicity, can be cleared from the body over time, and thereby can be best used for biomedical applications.
The results throw light on how energy transfer from the electron beam to graphene layers leads to the removal of carbon atoms from graphene layers and on the possibility of using electron-beam irradiation to locally induce chemical reactions in a controlled manner.
Graphene is an ideal platform to study many-body effects due to its semimetallic character and the possibility to dope it over a wide range.
The high degree of biocompatibility along with high porosity and good mechanical properties makes graphene an ideal material for use as body implants.
The method is eminently suited to dope graphene with boron and nitrogen by carrying out arc discharge in the presence of diborane and pyridine respectively.
This work opens up a whole new vista on how to disperse graphene.
Journal ArticleDOI
Li Song, Lijie Ci, Wei Gao, Pulickel M. Ajayan 
13 May 2009-ACS Nano
127 Citations
This transfer-printing technique paves a new and simple way to get large-scale graphene patterns on to any substrates.
Such rules can only act as guidelines at this early stage in the development of graphene-based technologies, yet they offer a set of design principles for the fabrication and safe use of graphene material that will come in contact with the human body.
Graphene hydrogenation is an attractive approach to functionalize graphene.
Graphene is turning out to be the material that will effectively kick-start a new era for nanotechnology.

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What are the current promising materials being explored for use in hybrid supercapacitors?
5 answers
Promising materials being explored for hybrid supercapacitors include Metal Organic Frameworks (MOFs) hybridized with carbon materials, conducting polymers, metals, and small molecules to enhance conductivity and mechanical stability. Transition metal-based compounds like Ni-Co-Se@C-CNT exhibit high capacitance, good electrical conductivity, and structural stability, leading to superior performance in supercapacitors. Vanadium-doped nickel sulfide (VNS) electrodes show enhanced specific capacitance and structural stability due to their nanoflower morphology, offering high energy density and excellent cycle performance in hybrid supercapacitors. These materials demonstrate significant advancements in improving the electrochemical performance, cycle stability, and energy storage capabilities of hybrid supercapacitors, paving the way for more efficient energy storage systems.
What is nanocatalyst?
5 answers
A nanocatalyst refers to a catalyst at the nanoscale, typically composed of nanoparticles with catalytic properties. Nanocatalysts have gained significant attention for their role in catalyzing various reactions efficiently. They have been utilized in diverse fields such as environmental protection, biosensing, nanomedicine, and organic synthesis. These catalysts can be made from different materials like noble metals, transition metals, and carbon nanomaterials, offering a wide range of applications. Nanocatalysts play a crucial role in promoting targeted treatments, such as in the case of cochlear implants loaded with nanocatalysts for inner ear infections. Understanding the catalytic mechanisms of nanozymes is essential for further advancements and rational engineering of active sites, paving the way for innovative applications in analytical, environmental, and biomedical domains.
Is the combination of graphene skid with silver nanoparticles effective as a sensitizer in radiotherapy or not?
5 answers
The combination of graphene oxide (GO) and Ti3C2 MXene (MX) nanoparticles has been shown to be effective as a sensitizer in radiotherapy. Additionally, gold nanoparticles (GNPs) have demonstrated promising potential as radiosensitizers in cancer radiotherapy. Furthermore, iron oxide and iron oxide/silver nanoparticles have been studied as radiosensitizers, with iron-silver bimetallic nanoparticles enhancing the therapeutic effect of low-dose radiation. High-atomic number nanomaterials like gold nanoparticles are widely used as radiosensitizers due to their ability to increase the deposition of radiation. Therefore, based on the research findings, the combination of graphene oxide with silver nanoparticles could indeed be effective as a sensitizer in radiotherapy, leveraging the unique properties of these nanomaterials to enhance the efficacy of cancer treatment while minimizing damage to healthy tissues.
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5 answers
Recent advancements in photocatalytic CO2 reduction reactions involve the utilization of various nanomaterials such as quantum dots, metal oxides, g-C3N4, and semiconductors to enhance efficiency. Strategies like surface engineering, co-catalyst loading, and morphology control have been crucial in improving photocatalytic performance. Additionally, the emergence of photothermal catalysis, combining advantages of photocatalysis and thermal catalysis, presents a promising approach for CO2 conversion. Single-atom catalysts, particularly with TiO2, g-C3N4, and MOFs as carriers, have shown significant benefits in CO2 reduction processes. Furthermore, there is a focus on converting CO2 into high-value carbon-containing compounds, especially C2+ products, to address environmental concerns and energy shortages. These advancements collectively aim to enhance energy conversion efficiency, product selectivity, and overall sustainability in photocatalytic CO2 reduction reactions.
Why does polycarbonate have high resistance to high temperatures?
5 answers
Polycarbonate exhibits high resistance to high temperatures due to various factors outlined in the research papers. The addition of PBT in polycarbonate forms a PC/PBT alloy, enhancing solvent resistance. Incorporating high-temperature-resistant resins and specific compatibilizers in the composition improves heat resistance, making the PC/PBT alloy equivalent to pure PC in terms of heat resistance. Furthermore, the use of specific high-temperature-resistant resins significantly elevates the heat-resistant temperature of polycarbonate, enabling its application in environments with ultrahigh heat-resistant requirements. Additionally, the utilization of modified graphene oxide in polycarbonate enhances material system compatibility and prevents degradation under high-temperature conditions, thereby improving heat resistance. These factors collectively contribute to polycarbonate's exceptional resistance to high temperatures.
What are the most common conventional methods used for heavy metal removal from industrial effluents?
5 answers
The most common conventional methods for heavy metal removal from industrial effluents include physical and chemical processes. Physical methods encompass techniques like magnetic separation, electrostatic separation, and gravity concentration, while chemical methods involve processes such as chemical precipitation and coagulation. However, these traditional methods have drawbacks like high energy requirements, non-selectivity, and the generation of toxic waste, leading to high operational costs and the need for proper waste disposal. To address these limitations, the development of novel green remediation technologies utilizing naturally occurring biological sources has been encouraged, focusing on bioremediation methods that utilize microbial bacteria for toxin elimination. Additionally, adsorption techniques, including biosorption using low-cost materials like agricultural wastes and natural adsorbents, have emerged as effective and economical alternatives for heavy metal removal from wastewater.
Doped silver sulfide quantum dots theranosis probe
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Doped silver sulfide quantum dots (Ag2S QDs) have shown promise as theranostic probes. These smart nanoplatforms can carry anti-cancer drugs like doxorubicin (DOX) within polyethylene glycol-coated Ag2S QDs, enabling high drug loading capacity, prolonged circulation in blood, and efficient tumor targeting. The release of DOX from these nanocarriers into cancer cells leads to significant tumor inhibition. Moreover, the fluorescence properties of Ag2S QDs in the second near-infrared window allow real-time monitoring of drug delivery and therapeutic efficacy. This innovative theranostic approach combines drug delivery, therapy, and assessment functionalities, offering personalized treatment options for tumors. The integration of imaging and therapeutic capabilities in doped Ag2S QDs showcases their potential as multifunctional agents for cancer therapy.
What substances can be determined by means of the UV-VIS spectrophotometer?
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The UV-VIS spectrophotometer can determine various substances such as urea, creatinine, uric acid, phosphate, and β 2-microglobulin in dialysate samples and blood. It is a valuable tool for monitoring compounds during dialysis sessions, with specific wavelength ranges showing high correlation for different substances. Additionally, UV-VIS spectroscopy finds applications in pharmaceuticals for qualitative and quantitative analysis of drugs in different matrices, coupling with chromatographic methods, and addressing challenges related to chemical reactions before measurements. This analytical technique is versatile, allowing for the determination of a wide range of substances in different fields, showcasing its significance in research and practical applications.
What is LFP coincell practical capacity?
4 answers
The practical capacity of LFP coin cells can be significantly improved by incorporating manganese-doped lithium iron phosphate (LFMP) coated with reduced graphene oxide (RGO) due to the enhanced coin cell performance in terms of capacity, coulombic efficiency, and charge-transfer properties. Additionally, a method for grading and screening LFP lithium-ion cells has been developed to ensure uniformity and improve cycle performance and safety of battery packs. Furthermore, the available energy of LFP batteries can decline with age, making accurate estimation crucial for battery management. Increment energy (IE) curves derived from capacity tests and increment capacity analysis (ICA) tests can help analyze battery degeneration characteristics and estimate available energy effectively.
How does interlayer modification thin film composite membrane effect the forward osmosis performance?
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Interlayer modification of thin film composite (TFC) membranes significantly impacts forward osmosis (FO) performance. Studies have shown that incorporating materials like MXene nano-sheets, titanium dioxide nanoparticles, and a mix of graphene oxide, dopamine, and humic acidinto the TFC membranes enhances their properties. These modifications lead to improved membrane characteristics such as increased hydrophilicity, reduced mass transfer resistance, and optimized water flux while maintaining low reverse solute flux. The modified membranes exhibit better osmotic separation, reduced internal concentration polarization, and enhanced membrane performance overall. By altering the structural and chemical properties of the active selective layer, interlayer modifications play a crucial role in enhancing the efficiency and effectiveness of FO processes.
Can dopamine be used as a diagnostic tool in combination with other methods to improve the accuracy of diagnoses?
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