ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Assessment of physicochemical properties of nanoceria dispersed in aqueous surfactant at 298.15 K

S. A. Yaseen, A. S. Alameen, F. A. Saif, S. B. Undre, and P. B. Undre

Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, India

E-mail: pundre.physics@bamu.ac.in

Received: 14 May 2022  Accepted: 14 August 2022

Abstract:

Cerium oxide (CeO₂₎ nanoparticles (NPs) have been synthesized using the precipitation method. XRD, FESEM, and FTIR spectroscopy were used to confirm the structure, shape, and functional group of produced nanoceria. CeO₂ nanofluids have been prepared by dispersing CeO₂ NPs in 150 micromolar (µM) aqueous cetyltrimethylammonium bromide, dodecyltrimethylammonium bromide, and sodium dodecyl sulfate as base fluids separately. The physiochemical and optical properties of nanofluids have been illustrated as a function of micromolar concentration from 25 to 150 µM/L for dispersed samples as fresh prepared (DSF) and dispersed samples after one week (DSW). The density (ρ, g cm⁻³), apparent molar volume (V_ϕ, cm³·mol⁻¹), viscosity (η, mPa.s), surface tension (γ, mNm⁻¹), friccohesity (σ, s.m⁻¹), and activation energy (\(\Delta {\mu }_{2}^{*}\), kJ/mol) were calculated at entire concentrations of CeO₂ nanofluids. The molar refraction (cm³/mol.), electronic polarizability (cm³), and UV–Vis spectra for all dispersion systems were studied at DSF and DSW. Electronic polarizability, viscosity, activation energy, and absorbance peak of UV–Vis spectra showed high values in the case of CeO₂ dispersion in aq-CTAB and aq-DTAB. This is because of high molecular weight and strong intermolecular interactions between nanoparticles and surrounding fluid over a greater surface area and developed intermolecular force between a head group ion of surfactant with solvent molecules and also between nanoparticles and surrounding. The study of dispersion of nanoparticles in surfactants may help to enhance the molecular interaction activity by inducing hydrophobic and hydrophilic interactions that play an important role in many areas like cleaning, cosmetics products, and pharmaceuticals.

Keywords: Nanofluids; CeO2 nanoflakes; Surfactants; Intermolecular interactions; Physicochemical properties

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02438-z

Chemical Papers 76 (12) 7693–7713 (2022)