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The present method can illustrate how specific material parameters govern lattice thermal conductivity and provide quantitative guideline in searching novel candidates with low thermal conductivity.
We show that the high performance of these materials derives mainly from a low thermal conductivity.
We show that this is the principal factor for the very low thermal conductivity.
The measurements show that both purity and thermal treatment strongly influence the value of thermal conductivity.
This plot allows researchers to quickly distinguish materials where the thermal conductivity has been optimized from those where improvement can be made.
This model of diffuson-mediated thermal conductivity may thus help explain experimental results of ultralow thermal conductivity.
Adding thermally conductive fillers to polymers the thermal conductivity can be raised significantly.
The addition of conductive filler in a polymer matrix is an effective way to increase the thermal conductivity of the plastic materials, as required by several industrial applications.

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Is glass cealing real?
5 answers
Glass ceilings are not a physical structure but rather a metaphorical barrier that represents the invisible obstacles hindering the advancement of certain groups, typically women and minorities, in the workplace. The term "glass ceiling" is not related to the physical properties or applications of glass material. Instead, it symbolizes the discriminatory practices and biases that prevent individuals from reaching higher positions despite their qualifications and abilities. The concept of glass ceilings is prevalent in discussions about workplace diversity and inclusion. It is crucial to address and break these barriers to create equal opportunities for all individuals in professional settings. The term "glass ceiling" is a sociological concept rather than a tangible glass structure.
What is NMR spectroscopy?
5 answers
Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful method for studying the structure, dynamics, and interactions of various molecules, including peptides, macromolecules, proteins, and synthetic macromolecular materials. It provides atomic resolution insights into complex biological systems, such as membrane-embedded proteins and mineral-associated proteins, which are challenging for other techniques like X-ray crystallography or electron microscopy. NMR spectroscopy is essential for chemical identification, structural studies, and analyzing molecular compounds in solutions, making it a valuable tool in structural genomics, drug discovery, and pharmaceutical research. Moreover, NMR can characterize the structure, dynamics, and motions of components within synthetic macromolecular systems, offering detailed information on molecular movements and functional species like protons or ions. Additionally, NMR spectroscopy plays a crucial role in characterizing polymer chains, estimating thermal mobility, and investigating chain conformations in both solution and solid states.
Can flax composite and CFRP composite be used together ?
4 answers
Flax composite and CFRP composite can indeed be used together in hybrid fiber-reinforced composites for engineering applications. Flax fibers offer sustainability and biodegradability, while CFRP provides high specific energy absorption rates. The combination of flax, kevlar, carbon, and carbon-kevlar fibers in epoxy composites has shown promising results, with the hybrid carbon/flax composite exhibiting superior mechanical properties like tensile strength, flexural strength, and impact strength compared to pure flax composites. Additionally, the use of flax fibers in composite materials has been established in various industries like automotive, maritime, wind energy, aerospace, and sports due to their strength and stiffness, making them suitable for lightweight structural applications. By leveraging the strengths of both flax and CFRP composites, hybrid fiber-reinforced composites can be tailored for specific engineering needs.
How to work as a developer?
5 answers
To work as a developer, one must understand the intricacies involved in the development process. Developers typically consist of components like transport screws, a high heat conductivity member, and a radiator to manage heat dissipation. The toner used in development should have specific characteristics, such as a volume average particle size between 3.0 μm and 7.0 μm, and surface roughness within a certain range, along with the addition of titanium oxide as an external additive. Additionally, developers may include colored resin particles with external additives, like nitrogen-containing resin particles, ensuring specific elemental analysis criteria are met for optimal performance. Furthermore, in the development process, apparatuses may utilize electrode wires with damping materials to control toner detachment and image development effectively. Understanding these aspects is crucial for successful work as a developer.
What is the collision cross-section of H beta peak in PECVD process?
5 answers
The collision cross-section of the H beta peak in the Plasma Enhanced Chemical Vapor Deposition (PECVD) process is not explicitly mentioned in the provided contexts. However, the research by Kebaili et al. discusses the interaction of SiHx radicals with the surface during the PECVD process, focusing on the reactivity coefficients of radicals like SiH3. On the other hand, the study by Edelman et al. delves into the deposition of Si:H solar cells by PECVD, highlighting the morphology and efficiency of the cells, but does not directly address the collision cross-section of the H beta peak. Therefore, based on the available data, the specific collision cross-section of the H beta peak in the PECVD process remains unspecified in the provided contexts.
What are the most commonly used machine learning algorithms for predicting material properties in multi-material metal additive manufacturing?
5 answers
Machine learning (ML) algorithms commonly used for predicting material properties in multi-material metal additive manufacturing include Random Forest, Gradient Boosting, Extreme Gradient Boosting, Support Vector Machines (SVM), K-Nearest Neighbours (KNN), decision trees, stochastic gradient descent (SGD) regressor, and Huber regression. These algorithms have been applied to investigate correlations between composition, processing parameters, and testing conditions to predict properties like yield strength, fatigue life, fatigue crack growth rate, latent heat, thermal conductivity, and thermal diffusivity in additively manufactured materials. The use of machine learning in predicting material properties offers insights into key features influencing the mechanical behavior of additively manufactured components, showcasing the potential of ML in accurately modeling material properties in multi-material metal additive manufacturing processes.
What is the effect of hBN fillers on the tribological properties of polymer composites?
6 answers
The incorporation of hexagonal boron nitride (hBN) fillers into polymer composites significantly enhances their tribological properties, as evidenced by various research findings. The addition of hBN fillers to polytetrafluoroethylene (PTFE) composites, for instance, has been shown to increase the mechanical and tribological performance of the PTFE matrix. This enhancement is quantified by increases in Young's modulus, bulk modulus, and shear modulus, alongside reductions in the coefficient of friction and friction stress, indicating improved wear resistance and reduced material loss during operation. Similarly, hBN/short carbon fibers/PTFE composites with added micropowder exhibit improved mechanical properties, lower friction coefficients, and enhanced wear resistance, highlighting the role of hBN in facilitating these improvements. Further studies reveal that hBN nanosheets significantly increase the interfacial cohesive strength, interfacial shear strength, and interfacial fracture toughness of PTFE nanocomposites, contributing to their superior tribological performance. The shape and size of hBN fillers also play a crucial role in the composite's performance, affecting thermal conductivity and passive cooling capabilities, which indirectly influence the tribological properties by affecting the material's temperature during frictional contact. Moreover, the addition of hBN fillers to ABS polymer composites increases shear viscosity and modifies surface microstructure, which can lead to changes in tribological behavior. The combined fillers, including hBN in a carbon fiber-reinforced polymer matrix, show increased wear resistance and mechanical properties, further underscoring the beneficial effects of hBN on tribological performance. Research on the tribological performance of polymer composites in corrosive conditions and under high temperatures also supports the positive impact of hBN fillers. Epoxy nanocomposites with hBN nanoplatelets exhibit improved wear performance and resistance to corrosive environments, while thermosetting polyimide composites reinforced with hBN show optimal anti-wear properties at both room and high temperatures. Additionally, the role of hBN content, exfoliation extent, and substrate conditions on the tribological performance of aromatic thermoset polymer coatings indicates that hBN significantly reduces the coefficient of friction and volume loss, enhancing wear resistance. In summary, hBN fillers markedly improve the tribological properties of polymer composites by enhancing mechanical strength, reducing friction and wear, and increasing resistance to adverse conditions, making them highly suitable for applications requiring durable and reliable material performance.
What is the effect of hBN fillers on the tribological properties of PTFE?
5 answers
The incorporation of hexagonal boron nitride (hBN) fillers into polytetrafluoroethylene (PTFE) composites significantly enhances their tribological properties, as evidenced by various research findings. Yuan-Long He et al. demonstrated that adding hBN alongside short carbon fibers and a specific micropowder to PTFE composites improved their mechanical properties, friction coefficient, and wear resistance, with a notable decrease in wear rate observed at certain filler concentrations. Similarly, Yanhong Feng et al. found that hBN, when used with silicon carbide (SiC) fillers in PTFE, not only improved thermal conductivity but also maintained low dielectric constants, suggesting an indirect benefit to tribological performance by enhancing material stability under operational conditions. Chaojie Xie and Kejian Wang's study further supports these findings, showing that hBN fillers, especially when combined with polyimide (PI), significantly reduce the coefficient of friction and wear rate of PTFE composites under dry sliding conditions. This reduction in wear and friction is attributed to the synergistic effect of hBN and PI, improving the dispersion and bonding within the PTFE matrix. Chen Pan et al. explored the thermal aspect, using hBN and aluminum nitride (AlN) as hybrid fillers in PTFE to disrupt hBN platelets' alignment, which indirectly suggests an improvement in tribological performance by enhancing thermal conductivity and reducing material degradation under thermal stress. Moreover, Anand Singh Rathaur et al. demonstrated that hBN fillers, when used in SU-8 composites, significantly improved wear resistance, thermal stability, and mechanical properties, indicating that hBN's benefits extend beyond PTFE composites to other polymer matrices as well. This broad applicability underscores hBN's role in enhancing the tribological performance of polymer composites. In summary, hBN fillers in PTFE composites lead to improved wear resistance, reduced friction coefficients, and enhanced mechanical and thermal properties, contributing to their overall superior tribological performance.
Is Ag2Se good for batteries?
4 answers
Ag2Se shows promise for battery applications due to its unique properties. Research indicates that Ag2Se coatings on Se/nitrogen-doped mesoporous carbon composites enhance electrochemical performance, offering high initial discharge capacity, coulombic efficiency, and reversible capacity. Additionally, Ag2Se is highlighted for its potential as a thermoelectric material, with optimized compositions exhibiting improved carrier mobility, low thermal conductivity, and high power factor, resulting in a nearly flat ZT value and high conversion efficiency. Despite challenges like sample dependence and poor reproducibility, high-density Ag2Se samples with a reproducible zT of 0.92 at 370 K have been achieved through simple room-temperature techniques, making Ag2Se a promising material for near-room-temperature battery applications. Therefore, Ag2Se's properties make it a viable candidate for use in batteries.
Why does a chlorinated glucose derivative with axial chlorines ring flip?
5 answers
The chlorinated glucose derivative undergoes ring flipping due to the presence of axial substituents, which induce conformational changes. Specifically, the axial-rich form of the pyranose ring, with bulky silyl-protecting groups on adjacent trans-diols, favors axial conformations, leading to ring flipping. This conformational change is crucial for achieving stereoselective glycosylation, as seen in the β-selective reaction induced by the axial-rich glucosyl donor. Additionally, the presence of axial chlorines in the molecule can lead to a shift from an amorphous to a crystalline form, driven by alkane-induced pore formation and weak interactions like phenolic OH···Cl hydrogen bonds. These interactions play a role in the reversible phase transition observed in the material.
What are the current advancements in research and development of full-Heusler materials for thermoelectric and photovoltaic applications?
5 answers
Recent research has shown significant progress in the development of Heusler materials for thermoelectric and photovoltaic applications. Studies have highlighted the potential of Heusler compounds in providing unique physical properties suitable for these applications. For instance, the manipulation of scattering processes within half-Heusler compounds has led to enhanced thermoelectric performance. Additionally, precise density functional theory calculations have demonstrated the half-metallic behavior and anisotropic performance of Cobalt-based Heusler materials, opening up avenues for thermoelectric and spintronic applications. Furthermore, the synthesis of Fe2TiSi full-Heusler thin films with controlled composition has resulted in promising thermoelectric properties, showcasing a high Seebeck coefficient and a notable ZT value at room temperature. These advancements underscore the potential of Heusler materials for efficient thermoelectric and photovoltaic devices.