研究目的
Investigating the early stages of single-wall carbon nanotube aggregation in aqueous surfactant suspension through combined structure-resolved fluorescence and variance spectroscopies.
研究成果
Variance spectroscopy can sensitively detect and characterize small loose clusters of carbon nanotubes that are not observable by other spectroscopic methods. The initial aggregation rates of SWCNTs correlate with species particle concentrations but show no clear dependence on nanotube structure.
研究不足
The study is limited to early stages of aggregation and does not address the formation of larger, more tightly bound aggregates. The use of a specific surfactant (STBS) may limit the generalizability of the findings to other surfactant systems.
1：Experimental Design and Method Selection:
The study used combined structure-resolved fluorescence and variance spectroscopies to investigate SWCNT aggregation. Variance spectroscopy was employed to detect and characterize small loose clusters of carbon nanotubes.
2：Sample Selection and Data Sources:
Samples were prepared from raw SWCNT material (Rice University HiPco reactor, batch 195.1) or raw CoMoCAT SWCNTs (SouthWest NanoTechnologies grade SG65i) suspended in sodium tridecylbenzenesulfonate (STBS).
3：1) or raw CoMoCAT SWCNTs (SouthWest NanoTechnologies grade SG65i) suspended in sodium tridecylbenzenesulfonate (STBS).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a prototype NS2 or NS3 NanoSpectralyzer, a Nikon TE-2000U inverted microscope, a Ti:sapphire laser, an InGaAs camera, and a custom-built variance spectroscopy apparatus.
4：Experimental Procedures and Operational Workflow:
Aggregation was induced by adding NaCl to the SWCNT dispersions. Fluorescence and variance spectra were measured over time to monitor aggregation.
5：Data Analysis Methods:
Variance data were analyzed to deduce the number of particles emitting at each wavelength. Co-variance analysis was used to identify heteroaggregates.
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