TY  - JOUR
SN  - 20462069
PB  - Royal Society of Chemistry
EP  - 38589
AV  - none
SP  - 38576
TI  - The influence of covalent and non-covalent functionalization of GNP based nanofluids on its thermophysical, rheological and suspension stability properties
N1  - cited By 25
Y1  - 2019///
VL  - 9
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075951086&doi=10.1039%2fc9ra07811h&partnerID=40&md5=6585a334a5e393a2f5d9e3d0f6da4db4
A1  - Hussein, O.A.
A1  - Habib, K.
A1  - Saidur, R.
A1  - Muhsan, A.S.
A1  - Shahabuddin, S.
A1  - Alawi, O.A.
JF  - RSC Advances
KW  - Fourier transform infrared spectroscopy; Gravimetric analysis; Particle size; Particle size analysis; Stability; Thermogravimetric analysis; Ultrasonic testing; Viscosity
KW  -  Conductivity improvement; Covalent functionalizations; Dispersion stability; Functionalized materials; Graphene nanoplatelets; Non-covalent functionalization; Stability of nanofluids; UV-vis spectrophotometry
KW  -  Thermal conductivity
ID  - scholars11989
N2  - Covalent functionalization (CF-GNPs) and non-covalent functionalization (NCF-GNPs) approaches were applied to prepare graphene nanoplatelets (GNPs). The impact of using four surfactants (SDS, CTAB, Tween-80, and Triton X-100) was studied with four test times (15, 30, 60, and 90 min) and four weight concentrations. The stable thermal conductivity and viscosity were measured as a function of temperature. Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA), X-ray diffraction (XRD) and Raman spectroscopy verified the fundamental efficient and stable CF. Several techniques, such as dispersion of particle size, FESEM, FETEM, EDX, zeta potential, and UV-vis spectrophotometry, were employed to characterize both the dispersion stability and morphology of functionalized materials. At ultrasonic test time, the highest stability of nanofluids was achieved at 60 min. As a result, the thermal conductivity displayed by CF-GNPs was higher than NCF-GNPs and distilled water. In conclusion, the improvement in thermal conductivity and stability displayed by CF-GNPs was higher than those of NCF-GNPs, while the lowest viscosity was 8 higher than distilled water, and the best thermal conductivity improvement was recorded at 29.2. © 2019 The Royal Society of Chemistry.
IS  - 66
ER  -