Investigating the thermo-physical properties of a new kind of graphitic carbon nitride included ternary hybrid nanofluids and the property correlations

Velu Nandakumar; Chandravadhana Arumugam; Padmanaban Radhakrishnan; Vellaisamy A L Roy; Gopalan Anantha-Iyengar; Dong-Eun Lee; Venkatramanan Kannan

doi:10.1016/j.heliyon.2024.e26163

Investigating the thermo-physical properties of a new kind of graphitic carbon nitride included ternary hybrid nanofluids and the property correlations

Heliyon. 2024 Feb 15;10(4):e26163. doi: 10.1016/j.heliyon.2024.e26163. eCollection 2024 Feb 29.

Authors

Velu Nandakumar^{1

2}, Chandravadhana Arumugam^{1

3}, Padmanaban Radhakrishnan¹, Vellaisamy A L Roy⁴, Gopalan Anantha-Iyengar^{5

6}, Dong-Eun Lee^{5

6

7}, Venkatramanan Kannan¹

Affiliations

¹ Department of Physics, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Kanchipuram, Tamil Nadu, 631 561, India.
² Department of Physics, Maharani's Science College for Women (Autonomous), Mysuru, 570 005, India.
³ Department of Physics, S. A. Engineering College(Autonomous), Chennai, Tamil Nadu, 600 077, India.
⁴ School of Science and Technology, Hong Kong Metropolitan University, Ho Man Tin, Hong Kong.
⁵ Intelligent Construction Automation Center, Kyungpook National University, Daegu, 41566, Republic of Korea.
⁶ Kyungpook National University, Daegu, 41556, Republic of Korea.
⁷ School of Architecture, Civil, Environment and Energy, Kyungpook National University, 1370, Sangyeok-dong, Buk-gu, Daegu, 702701, Republic of Korea.

Abstract

In this work, a simple and facile approach was employed for the preparation of the ternary hybrids comprising of titanium dioxide, zinc oxide and graphitic nitride (designated as TZG-TH) with varying compositions of the components. In the context of complex and multi-stages involved for preparation of many of the THs in the literature, the present work uses the much simpler mythology for the preparation of TH. Nanofluids (NF) were formulated in ethylene glycol: water base fluid using TZG TH as the solid particles. Scanning electron microscope of TZG TH informs that the particles are agglomerated. High resolution transmission electron microscopy image of TZG-TH reveals the presence narrowly distributed spherical particles (having the sizes in the range 40 nm-100 nm) in sheet like structure The core level X-ray photoelectron spectrum of carbon and nitrogen elements reveal the existence of sp2 -bonded C in the C[bond, double bond]N and pyridinic and graphitic nitrogen in TZG-TH. X-ray diffraction patterns of TZG TH show the existence of anatase and hexagonal phase wurtzite crystalline structure in TH. The thermo-physical properties were determined for of the THNFs in order to elucidate the influence of compositions of the component and concentration ofof TZG-TH on the thermophysical properties. The TZG TH containing larger proportions of ZnO showed the maximum of 9.11 % and 12.1 % higher increase in viscosity than the binary and base fluid, respectively. The density of TZG THs varies from 1.079 to 1.095 cp, which is closer to the base fluid. The influence of TZG TH composition on refractive index and ultrasonic velocity indicates the existence of molecular level interactions between the nanoparticles in the TH and base fluid. The ∼210 % thermal conductivity enhancement was witnessed for the TZG TH, which is significantly higher than that of ZnO mono NF (26.9%) and TiO2 mono NF (33.0%). The influence of composition and concentration of TZG- TH on molecular interaction parameters like adiabatic compressibility, intermolecular free length, free volume, internal pressure and specific acoustic impedance are reported. The TZG TH based NF showed adequate dispersion stability as inferred from dynamic light scattering and UV-visible spectroscopy results. The results on TZG TH included THNF are new to the literature and would be helpful in exploring multifunctional properties with heat transfer capabilities for applications.

Keywords: Nanofluids; Properties; Stability; Ternary hybrids; Thermal conductivity.