An experimental study on the dispersion stability of alumina-water nanofluids via particle size distribution and zeta potential measurements

Date

2016-01-01

Author

Elcioglu, Elif Begum
Okutucu Özyurt, Hanife Tuba

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

180
views

0
downloads

The concept nanofluids have attracted attention due to the possibility of gaining increments in transport properties including thermal conductivity. While such increments have been verified to some extent, their maintenance is a concern. Since the sustainability of the properties strongly depend on the colloidal behavior, a fundamental understanding on the dispersion stability of nanofluids is essential. This study is a demonstration of evaluating the dispersion stability of one-year old Alumina - Water nanofluids by means of the particle size distribution and zeta potential measurements. It is critical to report the thermophysical and particulate characteristics of nanofluids over certain periods, since such an approach will help on foreseeing the possibility of these fluids' transition to applications, as well as their feasible use in industry as heat transfer fluids. The zeta potential measurements on the samples indicate high electro-dynamic stability, while the particle size distribution analyses revealed a moderately poly-dispersed condition of nanoparticles. No nanoparticle settlement was detected through visual inspection. When compared to those reported in the literature, the aggregation observed in this study is not very critical. The authors highlight the requirement of performing stability experiments periodically and frequently. Also, some and give future work suggestions on nanofluid stability is provided.

Subject Keywords

Nanofluid, Alumina-water, Particle size distribution, Zeta potential, Stability, Dispersion

URI

https://hdl.handle.net/11511/52718

Journal

HIGH TEMPERATURES-HIGH PRESSURES

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

A theoretical study of chemical doping and width effect on zigzag graphene nanoribbons Pekoz, Rengin; Erkoç, Şakir (Elsevier BV, 2009-12-01) The energetics and the electronic properties of nitrogen- and boron-doped graphene nanoribbons with zigzag edges have been investigated using density functional theory calculations. For the optimized geometry configurations, vibrational frequency analysis and wavefunction stability tests have been carried out. Different doping site optimizations for a model nanoribbon have been performed and formation energy values of these sites revealed that zigzag edgesite for both of the dopants were the most favorable ...
An investigation of x-ray escape for an HPGe detector Can, Cüneyt; Bilgici, SZ (Wiley, 2003-07-01) X-ray escape peaks for a planar HPGe detector were investigated for a point source of photons with 59.5 keV energy. The effect of the solid angle for the incident photons on the escape probability of Ge K x-rays was studied using collimators with varying apertures. A Monte Carlo program was also developed to estimate the probability of escape for various mechanisms and routes. The experimental and simulation results showed that the escape probability is essentially constant for a wide range of collimator ra...
A comparative study of the electronic properties of aluminum nitride compounds Mohammad, Rezek; Katırcıoğlu, Şenay (2016-01-01) Electronic properties of aluminum nitride in wurtzite, zinc-blende, and rock-salt phases are investigated by a full potential-linearized augmented plane waves method based on density functional theory within standard local density approximation and its four improved versions. Local density approximation corrected by the generalized gradient functional of Perdew-Wang-Engel-Vosko is found to be more successful than the other generalized gradient functional approximations considered in this work for providing ...
A density functional theory investigation of graphene-based materials Sayın, Ceren Sibel; Toffoli, Hande; Department of Physics (2014) Employability of graphene-based materials in various technological applications in order to exploit its exceptional properties is achieved/improved via their interactions with various atoms, molecules, nanostructures and surfaces. In this thesis, the interaction of cyclohexane and derived molecules, carbon nanotubes and metallic surfaces with both pristine and defected graphene structures are investigated using density functional theory.
A theoretical study on vomitoxin and its tautomers Türker, Burhan Lemi; Guemues, Selcuk (Elsevier BV, 2009-04-15) In the present work, the structural and electronic properties of vomitoxin (deoxynivalenol, a mycotoxin) and all of its possible tautomers have been investigated by the application of B3LYP/6-31 G(d,p) type quantum chemical calculations. According to the results of the calculations, tautomer V-4 has been found to be the most stable one among all the structures both in the gas and aqueous phases. The calculations also indicated that, vomitoxin and V-2 possess the deepest and the highest lying HOMO levels, re...

Citation Formats

E. B. Elcioglu and H. T. Okutucu Özyurt, “An experimental study on the dispersion stability of alumina-water nanofluids via particle size distribution and zeta potential measurements,” HIGH TEMPERATURES-HIGH PRESSURES, pp. 239–250, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52718.