The document proposes a research project to fabricate a composite of aluminum and carbon nanotubes (CNTs), determine its effective thermal conductivity, and evaluate its application in heat sinks. The objectives are to describe thermal properties of Al-CNT composites, evaluate synthesis methods, fabricate an Al-CNT composite, measure its thermal conductivity, characterize the composite, and evaluate its use in heat sinks. Various synthesis techniques and thermal conductivity measurement methods are discussed.

1. Fundamentos de Nanociencias,
Nanotecnología y sus Implicaciones Sociales
Propuesta de Proyecto de Investigación:
Fabricación y Determinación de la Conductividad Térmica
Efectiva de un Compuesto de Aluminio y Nanotubos de
Carbono CNT´s y evaluar su aplicación en Disipadores de
Calor
Presentado por: Arlex Guzman (arlexrush@gmail.com)
Asesorado por: Dr. Anwar Hasmy
Dr. Ernesto Medina.
Enero, 2012

2. EL PROBLEMA
Fabricación y Determinación de la Conductividad Térmica
Efectiva de un Compuesto de Aluminio y Nanotubos de
Carbono (CNT´s) con la finalidad de usarlo como material
para el diseño y fabricación de Disipadores e
Intercambiadores de Calor.

3. OBJETIVO GENERAL
Fabricar un Compuesto de Aluminio y Nanotubos
de Carbono (CNT´s), determinar su Conductividad
Térmica Efectiva y evaluar su aplicación en
Disipadores de Calor.
OBJETIVOS ESPECIFICOS
Describir Propiedades Térmicas de los CNTs en compuestos de
Aluminio-CNTs (Al-CNTs).
Evaluar los diferentes métodos de Síntesis de compuestos de Al-
CNTs.
Propuesta de Diseño y Fabricación de Compuesto CNTs-Aluminio
(Síntesis).
Medición y Determinación de la Conductividad Térmica Efectiva del
Compuesto Al-CNTs.
Caracterización del compuesto Al-CNTs.
Evaluación de la aplicabilidad en disipadores de Calor.

4. DEFINICIÓN DE PROYECTO
VARIABLES DE INVESTIGACIÓN.
• Kapitza Interface Resistance.
• Alignment.
• Dispersion.
• Umklapp phonon-phonon scattering processes.
• length efficiency in CNT (< 1 μm). Para longitudes mayores reduce la
conductividad Térmica debido a curbaturas y doblados.
TÉCNICAS DE SINTESIS

5. Técnicas de Síntesis de Compuestos.
Spray de Plasma
Fig. 1. Schematic showing the plasma spray formed cylinder (not to scale) and the
orientation of the sample used for thermal conductivity measurement.

6. Técnicas de Síntesis de Compuestos.
semi-solid powder processing
Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing.
Yufeng Wu1, Gap-Yong Kim∗
Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA

7. Técnicas de Síntesis de Compuestos.
• Natural rubber as a mixing medium.
• Molecular-level mixing method.
• Thermal Spraying.
• Hot-pressing.
• Hot extrusion.
• Spark plasma sintering.
• Electro-less deposition.

8. Técnicas de Medición
Medición de Conductividad Térmica. Flash Diffusivity.
k = α x ῥ x CP
α: Thermal diffusivity, was measured using a Holometrix Micromet-300 Thermal Diffusivity
Instrument (Metrisa Inc., Bedford, MA) by the pulse method for several temperatures
between 50 °C and 300 °C
ῥ: bulk density, of the composite which was measured by the Archimedes method and found
to be 2.44 g cm3 and 2.35 g cm3 for Al–Si and Al-10CNT coatings respectively.
CP: specific heat capacity, were taken as the mole fraction weighted average (Neumann– Kopp
additive rule) and the values for the CP for Al–Si and CNT (Graphite) were obtained from the
thermodynamic database FACTSAGE™

9. Técnicas de Medición
Medición de Conductividad Térmica. Modelos Teóricos y
Computacionales

10. Caracterización
Compuesto de Al-
10%w.CNTs, fabricado
por Spray de Plasma
Optical micrographs showing low magnification microstructures of (a) Al–Si and (b) Al–10CNT coatings. (c) High magnification
SEM image of fracture surface of Al–10CNT coating showing good CNT distribution in the matrix region, and (d) SEM image
showing a partially infiltrated porous CNT cluster in the Al–10CNT coating.

11. Técnicas de Medición
Compuesto de Al-10%w.CNTs, fabricado por Spray de Plasma.
RESULTADOS DE APLICACIÓN DEL OOF.
Fig. 5. (a) Binary image of the distribution of CNTs in the inter-splat region obtained from the SEM image of fracture surface (Fig.
3c), (b) the finite element mesh of the binary
image with boundary conditions applied for analysis, and (c) the heat flux distribution variation along the microstructure. Note
the high heat flux along the CNTs owing to
their high thermal conductivity.

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