Journal
JOURNAL OF COLLOID SCIENCE AND BIOTECHNOLOGY
Volume 3, Issue 1, Pages 75-84Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jcsb.2014.1072
Keywords
ZnO; Zeta Potential; Nanoparticle Stability; pH; Nanoparticle Tracking Analysis; Dynamic Light Scattering
Categories
Funding
- International Foundation of Science [W/5334]
- Swiss National Foundation [200021_135240]
- seventh framework EU-VRI program NanoMILE project
- Swiss National Science Foundation (SNF) [200021_135240] Funding Source: Swiss National Science Foundation (SNF)
Ask authors/readers for more resources
In this study, the zeta potential and z-average hydrodynamic diameter of zinc oxide (20 nm, 99.5% purity) were investigated as a function of pH and time. The nanoparticles readily formed aggregates and could not be disintegrated to its primary size eventhough ultrasonication was applied. In zinc oxide suspensions (25 mgL and 100 mg/L) the nanoparticles were examined for electrophoretic mobility and aggregation behaviour within the pH range of 3 to 11 and time duration of 60 minutes. In this study, the particle size and zeta potential were measured by dynamic light scattering technique. The application of nanoparticle tracking analysis was demonstrated as well to observe the aggregation and disaggregation of zinc oxide nanoparticles at various pH values. The NTA results obtained in this work were compared and validated by the DLS. The z-average hydrodynamic diameter of the particles was 389 d center dot nm with an average zeta potential value of +23 mV using the DLS compared to mean particle size of 365 d center dot nm by NTA. DLS analysis also identified the pH of the point of zero charge (pH(PZC) ) and the isoelectric point (IEP) at pH 9.4 and pH 6.4 respectively. It was found that the zeta potential remained unaffected by the concentration of the suspension. However, results show that pH does have a pronounced effect on the stability of zeta potential, pH and particle size as a function of time in pH regions where dissolution (
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available