研究目的
Investigating the unambiguous determination of rotational and translational diffusion coefficients of nanorods in suspension using a new analysis of depolarized dynamic light scattering data.
研究成果
The method proposed allows the measurement of statistically meaningful particle sizes and aspect ratios, complementing real space methods. Diffusion coefficients obtained show good agreement with calculations based on the direct measurements of rod length and diameter.
研究不足
The existing theoretical models have not been thoroughly experimentally tested, due to ambiguities in the interpretation of the scattering data. Further studies over a wider range of particle sizes, materials, and aspect ratios are needed to examine the range of validity of these theories.
1：Experimental Design and Method Selection:
The study uses depolarized dynamic light scattering (DDLS) to analyze nanorods in suspension, focusing on isolating translational and rotational diffusion coefficients.
2：Sample Selection and Data Sources:
Gold nanorods of four different aspect ratios were purchased from Nanopartz.
3：List of Experimental Equipment and Materials:
ALV-5022F light scattering spectrometer with a laser wavelength of 633 nm, cylindrical glass cuvette, Glan–Thompson prism, and MATLAB for data processing.
4：Experimental Procedures and Operational Workflow:
DLS measurements of 120 s duration were obtained in IVV and IVH modes at scattering angles from 12° to 140° with an angular step of 2°.
5：2°. Data Analysis Methods:
5. Data Analysis Methods: Data is processed with a custom graphic user interface written in MATLAB, using least-squares fitting algorithm and normalized root mean square error (NRMSE) for fit quality.
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