In the work related to this dataset, we propose a fast and quantitative method for the in situ characterization of dispersions of polydisperse nanoplatelets on the example of graphene nanoplatelets (GNPs) and gibbsite. The method relies on synchrotron small-angle X-ray scattering (SAXS). The SAXS data are fitted with a polydisperse form factor for platelets, which yields size distributions in both thickness and radius. This dataset contains the SAXS data and mathematica scripts to process the data, fit a form factor and visualize the results. In addition, the dataset contains data from additional characterization: dynamic light scattering (DLS) and transmission electron microscopy (TEM).

The dataset is organized according to measurement technique. It contains the following folders:
- SAXS data: the raw and averaged SAXS data (*.h5), all azimuthally averaged. For the raw 2D SAXS patterns, see the ESRF data repository: https://data.esrf.fr/doi/10.15151/ESRF-DC-1388457372
- DLS data: the DLS data as obtain with the Litesizer (*.xlsx)
- TEM data: the raw and processed TEM images for gibbsite E27. It also includes the measurement data.
- SAXS analysis: The analysis pipeline developed in Mathematica (*.nb). To use the scripts, follow these steps:

1. First the notebook "Polydisp fitting functions thickness and radius - number weighing full form factor.nb" should be run. It does the following: 
- It imports all the data from the SAXS data folder (note that you should set the folder location to the relevant storage location on your computer). 
- The notebook contains all prerequisite functions for data processing (background subtraction, merging of SAXS patterns, averaging, binning, slope calculation), form factor fitting and visualization.
- It contains some example form factor as also provided in Figure (S)1. 

2. To analyze a specific SAXS sample, run the notebook in the corresponding folder with the suffix "- number", e.g. "Sample playground LH-ESRF-C22 NEW.nb". These notebooks contain the number-weighted SAXS analysis as detailed in the manuscript. 

3. To compare the SAXS data with DLS data, the SAXS data was analyzed in an intensity-weighted manner rather than number weighted. To reproduce these findings, first run the notebook "Polydisp fitting functions thickness and radius - intensity weighing.nb" and follow with the notebook (suffix: "- intensity") for the sample of interest. Note: these intensity-weighted scripts were ONLY used to compare SAXS with DLS data.

Note: the analysis was performed in Mathematica 13.2


Sample names:

C14: GNP synthesized with 6 mg/mL EC, 500*g centrifugation
C15: GNP synthesized with 6 mg/mL EC, 1000*g centrifugation
C16: GNP synthesized with 6 mg/mL EC, 2000*g centrifugation
C20: GNP synthesized with 3 mg/mL EC, 500*g centrifugation
C21: GNP synthesized with 3 mg/mL EC, 1000*g centrifugation
C22: GNP synthesized with 3 mg/mL EC, 2000*g centrifugation

E27: Gibbsite from Janne-Mieke Meijer & Tom Jenniskens (1.0 wt% in water)
E72: Gibbsite from Mark Vis DB940 (0.18 wt% in water)
