Video Experimental Relacionado
Updated: Jun 4, 2025
05:20
Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
17.3K
Radiación térmica con un giro
Sathwik Bharadwaj1, Zubin Jacob1
1School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
Science (New York, N.Y.)
|December 19, 2024
Resumen
Los filamentos de nanotubos de carbono retorcidos generan ondas de calor giratorias a altas temperaturas. Este descubrimiento ofrece nuevos conocimientos sobre el transporte térmico en nanomateriales.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- La física
Sus antecedentes:
- Los nanotubos de carbono (CNT) son nanomateriales avanzados con propiedades térmicas únicas.
- La comprensión del comportamiento térmico en las nanoestructuras es crucial para el desarrollo de nuevas tecnologías.
Objetivo del estudio:
- Investigar las características de emisión térmica de los filamentos de nanotubos de carbono retorcidos.
- Para explorar el fenómeno de las ondas de calor giratorias en CNTs a temperaturas elevadas.
Principales métodos:
- Fabricación de filamentos de nanotubos de carbono con una geometría retorcida específica.
- Experimentos a altas temperaturas para medir la emisión térmica.
- Análisis de la propagación y las características de las ondas de calor.
Principales resultados:
- Los filamentos de nanotubos de carbono con geometría retorcida fueron fabricados con éxito.
- Observación de las ondas de calor giratorias emitidas por estos filamentos a altas temperaturas.
- Caracterización de la frecuencia y amplitud de las ondas de calor emitidas.
Conclusiones:
- La geometría retorcida de los filamentos de nanotubos de carbono influye significativamente en su emisión térmica.
- Las ondas de calor giratorias representan un nuevo modo de transporte térmico en las CNT.
- Los hallazgos proporcionan una base para nuevas aplicaciones de gestión térmica utilizando nanomateriales de ingeniería.
Videos de Conceptos Relacionados
01:20Mechanisms of Heat Transfer II
3.2K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.2K
01:17Radiation: Applications
1.1K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.1K
01:05Absorption of Radiation
703
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
703
01:10Dual Nature of Electromagnetic (EM) Radiation
1.9K
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
1.9K
01:19Mechanism of heat transfer
1.2K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.2K
01:14Mechanisms of Heat Transfer I
4.1K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.1K