Original or unprocessed data is provided in support of the article “Anomalous Diffusion-Assisted Brightness in White Cellulose Nanofibril Membranes”. The article was accepted for publication in 2018 in the journal "Advanced Materials". Electronic Supporting Information is available from the publisher. The data is structured into folders, each correlating to a specific data type presented in the published article.

In the raw data, the transparent membranes are referred to as “N1”, the semi-transparent ones are referred to as “N2” and the white one as “D2”. This prefix is followed by a letter to indicate a specific sample in the series (see folder 1 for more details).

Folder 1: Photographs of the samples and recordings of their thicknesses as measured with the profilometer. This folder also includes the original files to produce the schematics in Figure 1a and Figure 4c.

Folder 2: this sets of folders concerns the optical measurements performed on the samples.

Folder 3: complete set of Scanning Electron Microscope (SEM) images.

Folder 4: files used to analyse the speckle patterns.

Folder 5: data regarding the characterisation of the cellulose nanofibers. This includes the Atomic Force Microscopy (AFM) raw data and the nitrogen physisorption results.