Paper
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4
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Conclusions
Nanopowders of Cu–Ni were synthesized using two modes of
combustion synthesis (SCS and ILCS or cellulose assisted
combustion synthesis) and characterized by various techniques
e.g. XRD, BET, SEM, TEM etc. Overall, it can be concluded that
the optimum criteria for the synthesis of pure metal nano-
particles depend on the quantity of fuel used. The SCS process
was found to be very sensitive to the amount of fuel used (4)
which affected the synthesized phases, crystallite size, micro-
structure, total surface area and porosity of the nanopowders
synthesized. The nature of product (metal or metal oxide) can
be tuned by changing the parameter 4. The ILCS method on the
other hand was found to be relatively less affected by the
amount of fuel used. Within the investigated range of 4 values,
only metal oxides were observed in ILCS method. The crystallite
size and microstructure were also remained unaffected
although a pattern was visible in case of total surface area and
porosity. The ILCS products displayed higher surface area and
larger pore volume as compared to SCS products. The higher
surface area was found to be due to large porosity rather than
crystallite size of the nanoparticles as ILCS products were found
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the main energy source for generating crystalline products.
Both steps, the exothermic synthesis reaction and the cellulose
combustion, release considerable amount of gases which form
channels while escaping and help in synthesizing porous
products.
combustion synthesis method for preparation of
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13 A. Kumar, A. Mukasyan and E. Wolf, Combustion synthesis
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Acknowledgements
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This publication was made possible by JSREP grant (JSREP-05-
004-2-002) from the Qatar National Research Fund (a member
of Qatar Foundation). The statements made herein are solely
the responsibility of the author(s). The authors also wish to
acknowledge the Central Laboratory Unit (CLU) and Gas Pro-
cessing Centre (GPC) at Qatar University for their support in
characterizing the synthesized nanomaterials.
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