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Volume 3, Issue 2 (Suppl)
Trends in Green chem
ISSN: 2471-9889
Environmental & Green Chemistry 2017
July 24-26, 2017
Page 76
5
th
International Conference on
6
th
International Conference on
July 24-26, 2017 Rome, Italy
Environmental Chemistry and Engineering
Green Chemistry and Technology
&
Synthesis of a stable iron oxide nanoparticles in ionic base fluid for photo-thermal conversion applications
Ehsan Nourafkan
and
D Wen
University of Leeds, UK
M
icroemulsion-mediated method is one of the unique and ideal techniques for the preparation of nanoparticles. A one-
pot microemulsion method was introduced in this research to synthesize and disperse iron oxide (Fe
3
O
4
) in an ionic base
fluid of lithium bromide-water. An effective steric repulsion force was provided by the surface functionalization of nanoparticles
during the phase transfer. The functionalization stage was performed by formation of a bi-ligand surfactant around nanoparticles
during the phase transfer of particles from oil phase to water phase. The formed nanoparticles exhibited a superior stability against
agglomeration in the presence of high concentrations of lithium bromide, i.e. 50 wt%, which make them good candidates for a range
of novel applications. The nanoparticles were analyzed by zeta potentiometer, Lumisizer dispersion analyzer, UV-visible spectroscopy,
dynamic light scattering (DLS) and transmission electron microscopy (TEM). As the reactants concentration and temperature is
elevated, the crystalline structure completion increase gradually, and the morphology of nanoparticles changes from a spherical into
a rod-like shape. The photo-thermal conversion characteristics of spherical and rod-shape nanoparticles also was studied under a
solar simulator. Experimental analysis indicates that the benefit of adding iron oxide nanoparticles into fluid was not only increasing
photon trapping efficiency to increase the bulk temperature under solar radiation, but also more likely to increase evaporation rate
due to surface localized heat generation. According to the results, the suitable photo-thermal conversion of nanoparticles together
with high stability in ionic media, nominates the iron oxide nanoparticles as a good candidate for using in solar air conditioners.
Figure 1:
(a, b) phase transformation of iron oxide nanoparticle fromorganic phase to aqueous phase, and (c) the proposedmechanism
for formation ne
w ligand around particles during phase transformation.
Biography
Ehsan Nourafkan is a Research Fellow in the School of Chemical and Process Engineering at the University of Leeds. His research interests are Surface Chemistry,
Polymers and Colloid Science, Nanofluids and Green Energy.
e.nourafkan@leeds.ac.ukEhsan Nourafkan et al., Trends in Green chem, 3:2
DOI: 10.21767/2471-9889-C1-002