Generation of Ag-di water nanofluids using multipulse laser ablation in liquid approach
- West Virginia University
- Carnegie Mellon University
Multiple laser ablation of a silver sample submerged in deionized water was carried out. The generated nanofluids were characterized using a variety of techniques to determine particle size, stability and surface properties. Results of transmission electron microscopy (TEM) and dynamic light scattering (DLS) indicate that the nanoparticles are reasonably monodisperse with sizes ranging from 10 – 60 nm depending on details of the ablation method. For the single pulse approach, the majority of the particles were in 14 – 32 nm range. There were some big ones as large as 50 – 60 nm in size. For double pulse approach, the particle sizes were more uniform and the majority of the particles were in 9 – 21 nm range with some big ones ranging from 23 – 26 nm in size. For stability analysis, one of the samples was filtered using a 0.45 μm filter and then re-analyzed. The result was essentially identical to those obtained when non-filtered samples were used. To test the possibility of particle aggregation, the sample was sonicated using an ultrasonic probe and then analyzed. These results again were identical to the other runs of the non-sonicated and non-filtered samples. All UV-VIS spectra on silver particles showed a surface plasmon peak around 409 nm and the absorbance versus concentration relationship was indeed linear over a range of dilutions of the stock solutions. Using Beer’s law and the slope of the curve showing the absorbance versus concentration data, concentrations of several stock solutions were measured to determine the impact of laser ablation variables on suspension concentration. It appears that the multiple laser ablation technique produces silver-based nanofluids of stability and controllable particle dimensions and laser configuration may dictate product concentration as well as product characteristic size.
- Research Organization:
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- None cited
- OSTI ID:
- 915626
- Report Number(s):
- DOE/NETL-IR-2007-199; TRN: US200816%%24
- Resource Relation:
- Conference: Nanofluids: Fundamentals and Applications (Engineering Conferences International), Copper Mountain, CO, Sept. 16-20, 2007
- Country of Publication:
- United States
- Language:
- English
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