Summary: | Polyaniline nanotubes (PANI NTs) blended in refined, bleached and deodorized palm olein (RBDL) nanolubricants were prepared via a two-step method. Initially, the synthesized PANI NTs were characterized to investigate the morphology and elemental composition of the obtained PANI NTs. The obtained image from transmission electron microscopy clearly
showed the presence of flake-like structure of PANI NTs. The presence of these PANI NTs was further affirmed with energydispersive
X-ray analysis, which shows the presence of high carbon atoms (the main element for PANI NTs). The formulated
surfactant-free nanolubricants were stabilized using ultrasonication with volume concentrations of 0.01, 0.03, 0.05, 0.1,
0.3 and 0.5%. The dispersion behavior of nanolubricants was investigated using visual sedimentation capturing, UV–Vis
spectrophotometer and dynamic light scattering (DLS) method. The sedimentation observation of the nanolubricants over
the duration of almost 1 month showed there was no sedimentation of the nanoparticles. UV–Vis spectra indicated that all
the prepared PANI/RBDL nanolubricants followed Beer–Lambert law. The value of absorbance was found to be slightly
decreased, with respect to the duration of time after sample preparation. The dispersion stability analysis supported by DLS
method revealed that the amount of particles agglomeration increased after 1 month of preparation. The chemico-physical
properties of prepared PANI/RBDL nanolubricants were further investigated by analyzing the chemical bonding using Fourier-
transform infrared spectroscopy (FTIR). Additionally, this study intends to investigate the influence of PANI NTs toward
the life cycle of base oil via thermogravimetric (TG) analysis. FTIR analysis showed that nanolubricants were chemically
stable as there were only physical interactions between PANI additives and RBDL base oil, while the degradation behavior
in TG curve demonstrated that the nanolubricants could withstand higher temperature as the volume concentration of nanoadditives
increased. Rheology and thermal conductivity properties of PANI/RBDL nanolubricants were performed by using
rheometer and thermal properties analyzer, respectively. Viscosity measurement revealed that PANI/RBDL nanolubricants
exhibited Newtonian behavior. Also, viscosity was found to have been increased with a volume concentration of PANI NTs
but decreases with the increase in temperature. From the thermal conductivity measurement, it is proven that the PANI NTs
dispersed in the RBDL palm base oil support the thermal properties enhancement. The 0.5% PANI/RBDL nanolubricants
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