AI Article Synopsis
- The study investigates how pH levels affect the dispersion and film-forming abilities of carbon nanotubes stabilized by poly(acrylic acid) (PAA), which is sensitive to pH changes.
- Quantitative measurements indicate that optimal stabilization occurs at pH 5, which is near the pK(a) of PAA, making it an effective dispersing agent at this level.
- The research highlights the importance of understanding the relationship between PAA adsorption and stability of the nanotube suspension to create uniform and conductive composite films.
Article Abstract
We present a detailed study of the influence of pH on the dispersion and film-forming properties of poly(acrylic acid)-stabilized carbon nanotubes. Poly(acrylic acid) (PAA) is a weak polyelectrolyte, with a pH-responsive behavior in aqueous solution. We obtain quantitative UV-visible measurements to show that the amount of polyelectrolyte in optimal pH conditions is weak, showing a good efficiency of the polymer as a carbon nanotube dispersing agent. The best dispersion conditions are achieved at pH 5, a value close to the pK(a) of PAA. Apart from this tenuous pH value, the PAA is not efficient at stabilizing nanotubes and atomic force microscopy allows us to explain the delicate balance between the PAA adsorption and the suspension stability. This study finally permits optimal conditions for making homogeneous and conductive composite films to be determined.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/la9018822 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!