@ Seiko, the commercial application of nanocellulose are papermaking, composites, packaging, electronic devices, coatings, biomedicine, automotive etc.

Thanks sir

Do you know any industry, who is currently using nano cellulose for their products

Seiko Jose Google or Google Scholar is your friend. See:

https://en.wikipedia.org/wiki/Nanocellulose

You will note there is a section called 'Potential Applications' and not 'Applications'. This may tell you something... Cost is the most important thing to take into account unless there are really exotic and superb technological advantages to negate the cost..