Articles tagged with Thermal Conductivity
Researchers find quasiparticles called ferrons that carry waves of polarization and heat in ferroelectric materials. The ferron's behavior is sensitive to an external electric field, turning the material into a thermal switch.
Researchers discovered that correlated rattling atomic chains can suppress thermal conductivity in thermoelectric materials, a mechanism that can aid in producing high-performance materials. The study provides new guidelines for engineering improved thermoelectric materials with lower thermal conductivity.
A team of Clemson researchers has developed a new method to evaluate the efficiency of thermoelectric materials, called the figure-of-merit (zT), which considers temperature, electrical conductivity, and thermal conductivity. The new method uses Peltier cooling to measure zT with higher resolution and accuracy.
Developed by Incheon National University researchers, the new membranes exhibit high mechanical strength, phase separation, and ionic conductivity. The 40% crosslinked membrane showed the highest relative humidity, normalized conductivity, and peak power density, surpassing commercial membranes.
University of Houston researchers have made a groundbreaking discovery in cubic boron arsenide, demonstrating exceptional high carrier mobility. This finding has significant implications for the development of efficient semiconductors, with potential applications in various electronic and optical fields.
Researchers at the University of Illinois have solved a long-standing puzzle about cubic silicon carbide's thermal conductivity, which is higher than previously thought. The team measured an isotropic high thermal conductivity of over 500 W m–1 K–1, ranking it second only to diamond.
Researchers at Pusan National University have developed a new, energy-efficient process to control the orientation of filler particles in thermally conductive polymer composites. This allows for improved heat dissipation in electronics and batteries, reducing energy costs and extending device lifespan.
Researchers at KAUST have developed a soft and flexible electronic 'e-skin' that can detect minute temperature differences between inhalation and exhalation, as well as touch and body motion. The material's island-bridge atomic structure provides an inherent softness and flexibility ideal for on-skin applications.
Researchers found that boron arsenide's thermal conductivity decreases at extremely high pressures, breaking the general rule of pressure dependence. This discovery may lead to novel materials for smart energy systems with built-in 'pressure windows'.
A new AI-based chemical sensor can accurately detect specific gases in the air by analyzing temperature changes in a microbeam resonator. The device uses machine learning to differentiate between gases with varying thermal conductivities, achieving 100% accuracy in identifying helium, argon, and CO2.
Researchers at the University of Tokyo have discovered that plant-derived cellulose nanofibers exhibit high thermal conductivity, potentially replacing environmentally damaging synthetic polymers. The discovery was made using a novel method to align the fibers, allowing for efficient heat transfer.
A University of Illinois team discovered liquid crystalline epoxy resins with high thermal conductivity, outperforming common polymers by up to 5 times. The breakthrough was achieved by precisely controlling the lengths of ethylene repeat units in the polymer structure.
Researchers at UNIST have developed a method to synthesize single-crystalline graphite films of up to inch scale, overcoming the critical issue of small size due to weak interaction between layers. The resulting films exhibit exceptional thermal conductivity and uniform quality.
Researchers from Shanghai Polytechnic University developed new efficient phase change microcapsules for storing solar energy, demonstrating superior photothermal conversion and thermal conductivity. The study found that the novel PCM microcapsule shells showed a 54.9% photothermal conversion efficiency, significantly higher than non-do...
Researchers have successfully switched on and off topological states in a material, exploiting the interaction of electrons to manipulate their behavior. The discovery opens up new possibilities for technical applications, including quantum computers and sensor technology.
Scientists developed a cellulose nanofiber-carbon fiber composite film with excellent in-plane anisotropic thermal conductivity, improving heat dissipation in thin-film devices. The material also exhibits recyclability and can be reused after burning the cellulose matrix.
Researchers from Osaka University successfully modulated the thermal switching temperature of block copolymers to create a tunable thermal switch. This innovation enables practical functionality for flexible organic electronics at low cost.
A team of researchers at Hokkaido University has developed a barium cobalt oxide thermoelectric converter that is reproducibly stable and efficient at temperatures as high as 600°C. This breakthrough material shows promise for wide deployment in high-temperature thermoelectric conversion devices.
Researchers used topological mathematics and machine learning to identify a hidden relationship between nano-scale structures and thermal conductivity in amorphous silicon. They found that the persistent homology diagram can be used as a descriptor for machine learning, achieving accurate predictions about thermal conductivities.
Researchers at UVA School of Engineering and Applied Science have discovered a way to make a versatile thermal conductor that can be controlled on demand. This advancement has promise for managing heating and cooling in electronic devices, green buildings and space exploration, with potential applications including the Mars Rover.
Researchers from Chinese Academy of Sciences developed a scalable and controllable approach to exfoliate high-quality hexagonal boron nitride nanosheets. The new method uses a rapid volume expansion of water in icing to reduce interlayer interaction, resulting in efficient exfoliation.
KAUST researchers have developed a method to manufacture high-performance flexible heaters using graphene domains in nanoscale-thick graphite films. The heaters can reach temperatures of several hundred degrees within seconds when applying a small voltage, and they exhibit excellent stability and cooling rates.
Scientists at HZB created sintered porous silicon-aluminum nanomaterials with reduced thermal conductivity using a novel process. The resulting materials have tiny pores, crystalline nanoparticles, and domain boundaries that suppress heat conduction.
Researchers uncover a new mechanism for lowering thermal conductivity in a unique material, which could aid the search for materials converting heat to electricity or vice versa. The discovery reveals a quantum mechanical twist on what drives exceptional thermoelectric properties.
Scientists from the University of Geneva discover that copper deposits are formed by mechanisms similar to those causing large volcanic eruptions. The 'porphyry' deposits, containing copper, form when hot fluids release from cooling magmas and develop under the earth's surface.
A team of scientists has developed a solution to accurately simulate how the atmosphere works by linking large- and small-scale simulations. This helps model winds, transport of pollutants, climate projections, and weather forecasts with greater accuracy.
Scientists have created a material that can reversibly switch between high and low thermal conductivity by changing its crystal structure dimensionality, opening up new possibilities for thermal management. The material's ability to alter its thermal conductivity allows for more efficient heat flow control.
Researchers at Tokyo Institute of Technology enhance the ZT of polycrystalline SnSe by introducing tellurium ions, increasing carrier concentration and reducing thermal conductivity. This breakthrough paves the way for high-performance thermoelectric materials.
A team of researchers at Osaka University created a thermocouple made of gold and platinum nanowires to measure the temperature directly next to a nanopore. They found that thermal energy was dissipated in proportion to the momentum of the ionic flow, in line with Ohm's law predictions.
Researchers have designed a novel thermal armour that successfully inhibits the Leidenfrost effect up to 1,150°C and achieves efficient liquid cooling across a wide temperature range. The breakthrough has significant implications for applications in aerospace, space engineering, and next-generation nuclear reactors.
Researchers have discovered that Earth's interior is cooling at a faster rate than expected, with implications for plate tectonics and the planet's overall activity. The study suggests that this increased heat flow will accelerate mantle convection, leading to a faster cooling of the Earth.
Researchers at JAIST have demonstrated a high thermal rectification ratio on suspended asymmetric graphene nanomesh devices at low temperatures. The device shows promise for developing a high-efficiency thermal rectifier based on graphene nanomesh structure.
A team of engineers found that thermal conduction is the most prominent form of heat transfer during droplet impact on smooth surfaces, influencing cooling efficiency and droplet behavior. Heat conduction also affects droplet dynamics on rough surfaces, leading to lower heat transfer rates.
Researchers at Georgia Tech and collaborators observed interfacial phonon modes, confirming their existence and contribution to heat transfer at interfaces. The discovery opens a new pathway for consideration in engineering thermal conductance for electronics cooling.
A study at the University of Plymouth found that retrofitting an existing building with a green wall reduced heat loss by 31.4%. The study suggests that living walls can provide significant energy savings and help reduce carbon emissions in existing buildings.
Scientists from Japan and Denmark discovered disordered one-dimensional chains in indium telluride, which exhibit ultralow thermal conductivity. This finding confirms the chemical and physical basis of low thermal conduction in thallium selenide-type materials, advancing thermoelectric power technologies.
Researchers from Peking University developed a new technique using 4D-EELS to measure phonon modes at heterointerfaces, directly observing localized phonon modes for the first time. This breakthrough enables better understanding and control of solid interfaces' properties.
Scientists at UChicago have invented a new thermal insulator with unusual properties. The material, made using an innovative technique, is extremely good at containing heat while also allowing it to be moved in different directions.
New research from Shibaura Institute of Technology reveals that spark plasma sintering produces highly dense MgB2 bulks with improved mechanical and superconducting properties. The resulting samples exhibit superior strengths and high trapped field performance, making them suitable for space applications and electric machines.
Researchers have discovered a new inorganic material with the lowest thermal conductivity ever reported, offering fundamental insights into heat management and waste heat conversion. The material combines two arrangements of atoms that slow down heat transport, resulting in a significant reduction in thermal conductivity.
Researchers at North Carolina State University have developed a flexible thermoelectric generator that converts body heat into electrical energy with improved efficiency. The device achieves significant reductions in heat leakage, resulting in higher output power density figures compared to previous versions.
Researchers created nanodiamond sensors that can act as both heat sources and thermometers, allowing for the measurement of thermal conductivity inside living cells. This breakthrough may lead to new diagnostics tools and cancer therapies, as well as a better understanding of metabolic disorders such as obesity.
Researchers have created putty-like composites of gallium metal with improved handling properties, enabling new applications in wearable devices and medical implants. The composites also exhibit excellent electromagnetic interference shielding and thermal interface materials properties.
A team of researchers has discovered that the titanium atom in crystal BaTiS3 is responsible for its poor thermal conductivity. The titanium atom exists in a double-well potential, allowing it to absorb and emit vibrations in a way that scatters energy rather than transferring it cleanly.
Researchers at the University of Illinois developed a method to create 3D images of fiber orientation in composite materials, enabling accurate predictions of thermal conductivity. This innovation has far-reaching implications for designing high-performance materials and heat shields.
Researchers at the University of Wollongong have developed a new thermoelectric material with record-high conversion efficiency, improving heat-to-electricity conversion by over 60%. The discovery could enable the creation of body-heat powered personal devices, revolutionizing low-maintenance electronics and zero-carbon power generation.
A team of Clemson researchers and international scientists have discovered a new way to measure thermoelectric material properties by using light. This breakthrough could lead to the creation of more efficient thermoelectric materials with higher zT values, which convert heat energy into useful electric energy.
Researchers from the Institute of Industrial Science, the University of Tokyo, have demonstrated a new cooling solution for nanostructured devices using surface waves. Surface phonon-polaritons (SPhPs) enhance thermal conductivity in thin membranes, improving heat transport beyond conventional acoustic phonon limitations.
Researchers at Shinshu University developed a topology-optimized thermal cloak-concentrator that can cloak and concentrate heat flux using general materials. The study utilized topology optimization to create an optimized structure that achieved both functions simultaneously.
Researchers found that MOFs become more insulated when filled with gases, contrary to expectations. This discovery poses challenges for the use of MOFs outside research labs and highlights the need for further investigation into their properties.
Researchers have found a new material with extremely low thermal conductivity, attributed to the weakening of chemical bonds in its one-dimensional chain structure. This discovery opens up potential applications for thermoelectric materials and thermal barrier coatings.
The study successfully minimizes thermal conductivity by designing and fabricating an optimal nanostructure-multilayer material through materials informatics. The researchers created a superlattice structure that maximizes wave interference of lattice vibrations to regulate thermal conductivity at near room temperature.
Researchers used machine learning algorithms to accurately predict rock thermal conductivity from well-logging data, outperforming traditional methods. This breakthrough can enhance geothermal investigations and basin modeling, leading to more efficient oil production.
Researchers developed a room-temperature bonding technique that integrates wide bandgap materials like gallium nitride with thermally-conducting materials like diamond. The interface layer is just four nanometers thick, allowing for two times more efficient heat dissipation.
Researchers used quantum mechanical computations to study the thermal conductivity of postperovskite at lower mantle conditions. The study found a significant jump in thermal conductivity associated with phase transition, which affects heat flux across the core-mantle boundary.
Researchers create a novel material with different thermal conduction properties depending on direction, combining the benefits of insulation and heat dissipation. The material's unique structure allows for efficient transfer of heat within layers while blocking it perpendicular to the layers.
Researchers confirmed the high thermal conductivity of isotopically enriched cubic boron nitride, a discovery that could lead to breakthroughs in cooling microelectronics. The team made the unique compound and measured its thermal conductivity, confirming theoretical predictions and opening up new avenues for research.
Researchers have discovered a much larger transverse figure of merit in topological semimetals compared to their longitudinal counterparts. This is attributed to the coexistence of electrons and holes contributing additively and high charge mobility without lattice imperfections.
Researchers at the University of Illinois have developed a new heat model that can help improve the thermal conductivity and reduce defects in gallium nitride semiconductors. This could lead to longer-lasting electronic devices with improved reliability.
Scientists have successfully measured thermal transport through single-molecule junctions for the first time, revealing that heat transfer is length-independent. The breakthrough uses custom-developed calorimetric-scanning-thermal-microscopy technique to determine thermal conductance, which originates from atomic vibrations or phonons.