Thermal Conductivity of Nickel Oxide Nanoparticles Synthesized by Combustion Method
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1256-N06-21
Thermal Conductivity of Nickel Oxide Nanoparticles Synthesized by Combustion Method Pranati Sahoo1,2; Dinesh K. Misra1; Girija S. Chaubey1; Jim Salvador3; Nathan Takas1; Pierre F. P. Poudeu1,2,* 1) The Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, LA, 70148 2) Department of Chemistry, University of New Orleans, New Orleans, LA, 70148 3) GM Research & Development Center, Warren, MI, 48090
ABSTRACT Monodispersed nickel oxide nanoparticles have been synthesized using solution combustion synthesis method. Size of the nanoparticles was controlled by varying different reaction parameters such as reaction temperature and reaction time. Structure and morphology of the nanoparticles were investigated using X-ray diffraction and transmission electron microscopy. BET surface area of 99.7 m2/g was obtained for the nanoparticles synthesized at 300 °C. A decrease in surface area was observed with increase in reaction temperature. The nanoparticles were compacted using spark plasma sintering technique at 950 °C and thermal conductivity was studied on compacted sample. Significant decrease in thermal conductivity was observed for nanoparticles in compared to their bulk counter-part. INTRODUCTION Nanosized materials contribute towards better physical and chemical properties than the bulk materials due to their fascinating properties like high surface area. Various chemical routes for the synthesis of nanoparticles have been developed depending on desired applications and suitability [1, 2]. Different metal oxide nanoparticles have been synthesized by adopting various methods [3, 4]. Among all those methods, combustion synthesis has attracted great attention due to its inexpensive and fast chemical productivity [5, 6]. Different types of fuel such as urea [7-9], glycine [10, 8] and hexamethylene tetramine [11] have been employed for different metal oxide nanoparticle synthesis. Nickel oxide is an important antiferromagnetic insulator material. Nickel oxide nanoparticle have been synthesized by various methods using different precursors [12], including gelatin [13] and different precipitation methods [14, 15]. It has also prepared by thermal decomposition of nitrates [16]. In this present work, attempt has been made to synthesize nano-size Nickel oxide particles by solution combustion method. The size of the nanoparticles were controlled by varying different reaction parameters such as combustion temperature and combustion time.
Nanoparticle samples were compacted using spark plasma sintering (SPS) technique and thermal conductivity of the sample were studied. EXPERIMENT All the reagents used in this synthesis are commercially available. Nickel nitrate hexahydrate (Ni(NO3)2. 6H2O (Aldrich, 99%), was used as oxidant and source of Nickel where as Urea (NH2CONH2 (EM Science) was used as fuel for the combustion. Both of the reagents were dissolved in distilled water and mixed thoroughly by stirring. Then mixture was introduced into preheated furnace. Reaction mixture undergoe
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