scispace - formally typeset
Search or ask a question

Answers from top 10 papers

More filters
Papers (10)Insight
The results put in evidence a clear stabilizing effect of carbon fibres on matrix oxidation.
> It was due to the strong interaction between carbon nanotubes and polymer matrix.
Such a “tenon-mortise” model provides a simple, stable, and powerful connection between carbon fiber and the epoxy matrix.
Results indicate that carbon matrix-sulfur composite is composed of lamellas.
This synthesis affords a good control of the alloy quantity, composition and particle size in the carbon matrix.
This suggests that the carbon contamination was caused by evaporation of CO gas from the carbon paper/dies.
The higher temperature is helpful for the graphitization of carbon matrix and growth of NiCo alloy.
It is mainly attributed to the Debye polarization of the carbon fibers and the interface polarization between fibers and the matrix.
This allowed to conclude that for temperatures below 800 °C carbon is present in a form of graphite domains inside glassy matrix.
The model accounts for the main microstructural features, being quite useful to describe the carbon nanotube distribution along the ceramic matrix.

See what other people are reading

Risk Battery Thermal Runaway?
5 answers
The risk of thermal runaway in lithium-ion batteries is a critical safety concern that has garnered significant attention from various sectors due to its potential for causing fires and explosions. Thermal runaway occurs when the battery's internal temperature and pressure rise uncontrollably, leading to a self-sustaining chain reaction. This phenomenon can be triggered by several factors, including thermal abuse, electrical faults, and mechanical damage. Research has shown that the thermal management of batteries using composite phase change materials (CPCMs) can effectively reduce the risk of thermal runaway by absorbing excess heat and maintaining the battery's temperature within safe limits. Additionally, the development of predictive models integrating fault tree analysis, dynamic Bayesian networks, and support vector regression offers a promising approach for early warning and dynamic risk prediction of thermal runaway events. The onset temperature for thermal runaway and the severity of the reaction can vary depending on the battery's state of charge (SoC), with higher SoCs leading to more severe reactions. Moreover, the design of the battery, including the venting mechanisms and the chemistry of the cathode material, plays a significant role in the battery's behavior under abuse conditions and its ability to mitigate the consequences of thermal runaway. Experimental studies have also highlighted the importance of understanding the effects of radiative heat transfer on thermal runaway propagation within a battery pack, suggesting that radiation can either facilitate or mitigate the spread of thermal runaway depending on various factors. Furthermore, the ambient conditions, such as pressure and temperature, significantly influence the thermal runaway characteristics and the associated fire behaviors. In summary, managing the risk of thermal runaway in lithium-ion batteries requires a multifaceted approach that includes advanced thermal management strategies, predictive modeling for early detection, and careful consideration of battery design and operating conditions.
What are the potential applications of nanomaterials in the fight against COVID-19?
5 answers
Nanomaterials offer diverse applications in combating COVID-19. They are utilized in the production of personal protective equipment (PPE), development of efficient prevention measures like nano-based disinfectants, creation of nano-biosensors for early detection, and as carriers for vaccines and gene editing tools. Nanotechnology also aids in faster diagnostic methods using nanomaterials, and in the application of carbon nanomaterials such as graphene and carbon nanotubes for combating the SARS-CoV-2 virus. These applications highlight the significant role of nanotechnology in providing solutions for detection, prevention, and treatment strategies against COVID-19, showcasing the versatility and effectiveness of nanomaterials in the ongoing battle against the pandemic.
What are the differences between PA6 and PA12 carbon fibre?
4 answers
PA6 and PA12 carbon fiber composites exhibit variations in mechanical properties. PA12 demonstrates superior mechanical and fatigue properties compared to PA6, despite PA12's almost amorphous state. On the other hand, a study comparing chopped carbon fiber reinforced polyamides found that as fiber content increased, the efficiency of the fiber in composites decreased, with the matrix type having a more significant impact on the composite properties than the fiber type. Additionally, the incorporation of multiwalled carbon nanotubes in a PA12/PA6 blend resulted in improved water diffusion behavior, with a slower diffusion rate and decreased water uptake at saturation, attributed to the rise in overall crystallinity and selective migration of nanotubes towards the more hygroscopic PA6 component.
What are the roles of SHS strands?
5 answers
The roles of SHS strands encompass various aspects such as simplifying processing of sinterable powders, achieving higher homogeneity of powders and sintered products, producing porous metallic and composite materials, fabricating targets and electrodes for thin film deposition on implants, and synthesizing inorganic pigments cost-effectively. SHS is utilized for creating nanopowders for medical applications, generating biocompatible coatings, and consolidating refractory ceramic powders efficiently. The combination of SHS with Spark Plasma Sintering (SPS) technologies proves beneficial in achieving densification of materials like MB2-based ceramics. SHS plays a crucial role in promoting diffusion phenomena during SPS by establishing strong interfaces among different phases. Overall, SHS strands play pivotal roles in diverse applications ranging from material synthesis to coating depositions and pigment production.
What is the mechanism of catalytic methane pyrolysis using Mo2C as the catalyst?
5 answers
Catalytic methane pyrolysis using Mo2C as the catalyst involves complex mechanisms. Mo2C has been shown to possess co-localized acidic and metallic sites, exhibiting high activity for deoxygenation of biomass pyrolysis products. While some studies suggest a redox mechanism with active participation of carbide carbon in methane reforming reactions, others highlight the role of Mo2C in activating CO2 and enhancing catalytic stability in dry reforming of methane reactions. The presence of Mo2C facilitates charge deposition, leading to the formation of new active interfaces like Ni-Mo2C, which significantly improve catalytic activity and stability. Additionally, the interplay between Mo2C and Ni particles dynamically balances carbon formation and consumption rates, inhibiting Ni sintering and enhancing overall catalytic performance in methane reforming reactions.
Where did the word "broiler" originate from?
4 answers
The term "broiler" originated from the poultry industry, specifically referring to fowl raised primarily for meat production, in contrast to layers which are raised for egg production. Over the past century, the production of chickens for meat consumption evolved significantly, transitioning from being a by-product of the commercial egg industry to a focus on meat production, particularly broilers. The development of genetic programs explicitly designed for broiler performance emerged in the 20th century, with a shift towards breeding programs aimed at producing commercial meat-type chickens efficiently. Broilers are now a key component of the poultry industry, with specialized hybrids and breeding techniques aimed at optimizing traits such as fast growth, high meat yield, and disease resistance.
How has plate tectonics contributed to past climate changes?
4 answers
Plate tectonics have played a significant role in past climate changes by influencing various factors. Tectonic activities, such as volcanic degassing of CO2 at subduction zones and mid-ocean ridges, have impacted atmospheric composition over millions of years. Additionally, changes in plate motion have been linked to alterations in vegetation and climate patterns throughout geological history. The Miocene Climatic Optimum, a period of warming around 17 to 14 million years ago, was attributed to changes in tectonic degassing of carbon dioxide, affecting global temperatures and ice sheet evolution. Furthermore, the uplift of mountain ranges like the Tibetan Plateau and Himalayas has influenced atmosphere and ocean dynamics, showcasing the pivotal role of tectonics in shaping long-term climate evolution.
What is Petroleum?
4 answers
Petroleum is a complex mixture of hydrocarbons found in various forms such as gas, liquid, and solid. It consists mainly of organic carbon and hydrogen compounds, with additional elements like nitrogen, sulfur, and oxygen, as well as traces of metals. This fossil fuel is utilized for various purposes, including as a major energy source for fuels, heating, and more, constituting a significant portion of the global energy supply. The physical properties and chemical compositions of petroleum are influenced by the organic matter in the source rock where it is generated, with processes like migration and remobilization affecting its composition in reservoirs. Despite its long history of use, efforts to standardize petroleum terminology have only emerged in recent decades to enhance understanding of its composition and properties.
What effect do new photocatalysts (eg Z-Scheme hetrojunction) have on the photocatalyst degradation process?
5 answers
The introduction of new photocatalysts, such as Z-Scheme heterojunctions, significantly enhances the photocatalytic degradation process. These advanced photocatalysts exhibit exceptional performance due to improved light absorption, enhanced charge carrier separation, and efficient electron transfer. For instance, the Z-Scheme system of LaFeO3/g-C3N4 demonstrated a 14.6 times increase in hydrogen production compared to single-component g-C3N4, along with high degradation rates of organic dyes. Similarly, the 3D/2D composite photocatalysts showed a 5.8-fold increase in photodegradation efficiency for Rhodamine B under visible light irradiation, attributed to enhanced redox capability and reduced carrier recombination. These innovative photocatalysts pave the way for sustainable water treatment solutions by efficiently degrading pollutants and addressing environmental challenges.
What is autogenous self-healing?
4 answers
Autogenous self-healing refers to the natural ability of materials like cementitious composites and concrete to repair cracks without external intervention. This process can occur through mechanisms like continuing hydration, carbonation, or the formation of products like calcium carbonate to fill cracks. Various strategies enhance autogenous self-healing, such as incorporating autolytic mineral microspheres (AMM), using specific agents like superabsorbent polymers or bacteria, and maintaining constant hydration. Engineered Cementitious Composites (ECC) demonstrate effective autogenous self-healing by closing microcracks through internal mechanisms, improving durability and service life. Additionally, adjusting mixture proportions and curing conditions can significantly enhance late-age autogenous self-healing efficiency in ECC.
How to calculate photothermal conversion efficiency of AgNP films?
4 answers
To calculate the photothermal conversion efficiency of AgNP films, a method involving the determination of the heat generation and light absorption properties is essential. The photothermal conversion efficiency can be quantified by analyzing the heat generated at the AgNP film upon solar light irradiation compared to a reference flat evaporated-Ag film. Additionally, the photothermal conversion efficiency of nanoparticles in solution can be accurately determined using a calorimetric method, where the induced heating power is related to the absorbed and incident optical powers. Furthermore, the photothermal performance of AuNPs embedded on PDMS films can be measured under NIR irradiation to assess the photothermal effect, with the surface temperature being adjustable based on the AuNPs' density and mechanical stretching. These methods provide insights into evaluating the photothermal conversion efficiency of AgNP films and other nanomaterials.