Stability and rheological properties of hybrid γ-Al2O3 nanofluids with cationic polyelectrolyte additives

Selenium(VI) and copper(II) adsorption using polyethyleneimine-based resins: Effect of glutaraldehyde crosslinking and storage condition

“…Other changes are associated to slight shifts of the bands. Taking PEI-GA1 as an example, the bands shift at 3261, 2928, 1655 and 1053 cm −1 , which are ascribed to the stretching vibrations of NHe (Kiruba et al, 2018), CHe (Kuila et al, 2012), C]N (Li et al, 2019) and COe (Ren et al, 2017), respectively. The disappearance of peaks at 2812 and 1102 cm −1 corresponding to CeH stretching and COe stretching, respectively, was also observed.…”

Obtenção de nanofluidos à base de nanopartículas magnéticas em misturas água e propilenoglicol para utilização em sistemas de refrigeração

“…Os nanofluidos (NFs), que são suspensões de nanopartículas (NPs) em fluidos como propilenoglicol, etilenoglicol, óleos minerais ou água (Choi, 1995), podem ser de materiais metálicos (Neogy et al, 2017), materiais não metálicos (Logesh et al, 2018;Kiruba et al, 2018), derivados de carbono (Soleimani et al, 2018), e outros.…”

A Review of Optical and Radiative Properties of Nanoparticle Suspensions: Effects of Particle Stability, Agglomeration, and Sedimentation

“…The main aim of hybrid nanofluid research is to assure its application in any equipment connected to heat transfer. A detailed experimental study to determine the physicochemical properties of hybrid nanostructures for biotechnology application was conducted by Turco et al (2007) and Kiruba et al (2018). In a study similar to the aforementioned, a hybrid nano-polymer was prepared for the applications in the solar cells as well for applications in evacuated tube solar collectors (Jamil et al, 2016;Muhammad et al, 2016;Sundar et al, 2017).…”

“…The NPSs stability is classified into three categories: (i) Kinetic stability: Nanoparticles that are dispersed in the NPSs due to the Brownian motion, overcoming their sedimentation caused by gravitational force; (ii) Dispersion stability: Because of the agglomeration of the nanoparticles, their dispersion into the fluids may deteriorate over time; and (iii) Chemical stability: Chemical reactions between the suspended nanoparticles or between the base fluid and nanoparticles are to be avoided. Thus, it is a necessary requirement to carefully prepare the NPSs to ensure their long-term stability following these three criteria (Das et al, 2007;Kiruba et al, 2018). There are several practical issues and challenges regarding nanoparticle agglomeration that need to be addressed and overcome before this field of study can be fully established.…”