Electrostatic Stabilization of Alumina Nanopowder Suspensions

Date

2014-03-01

Author

Çınar, Simge

Metadata

Show full item record

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

Item Usage Stats

136
views

0
downloads

Electrostatic stabilization has an impact on a broad range of applications. Previous research has shown that concentrated alumina nanopowder suspensions can be stabilized at specific ranges of ionic strength and pH. This study investigated the stability of alumina nanopowder suspensions in terms of viscosity measurements as a function of different electrolyte concentration and suspension pH. Using alumina nanopowders with an average particle size of about 50 nm, stable suspensions were obtained with 0.020 ≤ [NaCl] ≤ 0.040 M or in the range 4 ≤ pH ≤ 7. The observed suspension stability was investigated by zeta potential measurements and explained with the DLVO theory. The effective volume fraction of solids brought about by bound water (or swelling), surface charge, and the compression of the electrical double layer were three plausible control mechanisms for the rheological behavior and electrostatic stabilization of alumina nanopowder suspensions with high solids content.

Subject Keywords

General Materials Science

URI

https://hdl.handle.net/11511/39028

Journal

Science of Advanced Materials

DOI

https://doi.org/10.1166/sam.2014.1773

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Ambient synthesis of nanomaterials by in situ heterogeneous metal/ligand reactions Chang, Boyce S.; Thomas, Brijith; Chen, Jiahao; Tevis, Ian D.; Karanja, Paul; Çınar, Simge; Venkatesh, Amrit; Rossini, Aaron J.; Thuo, Martin M. (Royal Society of Chemistry (RSC), 2019-08-07) Coordination polymers are ideal synthons in creating high aspect ratio nanostructures, however, conventional synthetic methods are often restricted to batch-wise and costly processes. Herein, we demonstrate a non-traditional, frugal approach to synthesize 1D coordination polymers by in situ etching of zerovalent metal particle precursors. This procedure is denoted as the heterogeneous metal/ligand reaction and was demonstrated on Group 13 metals as a proof of concept. Simple carboxylic acids supply the etch...
Electromagnetic simulations of polarization-insensitive and wide-angle multiband metamaterial absorber by incorporating double asterisk resonator Abdulkarim, Yadgar; Deng Lianwen, Deng Lianwen; Luo Heng, Luo Heng; Huang Shengxiang, Huang Shengxiang; He Longhui, He Longhui; Li Yuhan, Li Yuhan; Muhammadsharif, Fahmi F.; ALTINTAŞ, OLCAY; Sabah, Cumali; KARAASLAN, MUHARREM (Springer Science and Business Media LLC, 2020-04-25) A novel multiband metamaterial absorber (MTMA) is proposed which is capable of well presenting a polarization-insensitive and wide incident angle stability in the microwave frequency range. The proposed MTMA comprising two vertically stacked asterisk-based copper resonators separated by dielectric layer of flame retardant type four and backed with a thin copper film. High-frequency structure simulator was used to simulate the absorber and to depict surface current distribution. The results showed that the a...
Reflectance spectra and refractive index of a Nd : YAG laser-oxidized Si surface Aygun, G; Atanassova, E; Turan, Raşit; Babeva, T (Elsevier BV, 2005-02-15) The reflectance spectra and refractive index of Nd:YAG laser-oxidized SiO2 layers with thicknesses from 15 to 75 nm have been investigated with respect to the laser beam energy density and substrate temperature. Thickness and refractive index of films have been determined from reflectance measurements at normal light incidence in the spectral range 300-800 nm. It was found that the oxide-growth conditions at higher substrate temperatures and laser powers greater than 3.36 J cm(-2) provides a better film qua...
Surface-enhanced Raman scattering spectroscopy via gold nanostars Nalbant Esentürk, Emren (Wiley, 2009-01-01) Anisotropic metallic nanoparticles (NPs) have unique optical properties, which lend them to applications such as surface-enhanced Raman scattering (SERS) spectroscopy. Star-shaped gold (Au) NPs were prepared in aqueous solutions by the seed-mediated growth method and tested for Raman enhancement using 2-mercaptopyridine (2-MPy) and crystal violet (CV) probing molecules. For both molecules, the SERS activity of the nanostars was notably stronger than that of the spherical Au NPs of similar size. The Raman en...
Simulation of equal channel angular pressing applied to produce structures with ultrafine-sized grains Karpuz, Pinar; Şimşir, Caner; Gür, Cemil Hakan (Inderscience Publishers, 2009-01-01) Severe plastic deformation methods are of great interest in industrial forming applications, as they give rise to significant refinement in microstructures and improvements in mechanical and physical properties. In the 'equal channel angular pressing (ECAP)', which is the most common method for production of ultrafine grained bulk samples, very high plastic strains are introduced into the bulk material without any change in cross section. In this study, the plastic deformation behaviour of the materials sub...

Citation Formats

S. Çınar, “Electrostatic Stabilization of Alumina Nanopowder Suspensions,” Science of Advanced Materials, pp. 520–529, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39028.