Improving the macroscopic uniformity of nanopaper by multi‐step coating of cellulose nanofibre dispersion

Abstract

Promising versatile applications of cellulose nanofibres (CNFs) include film structures for device substrates and surface coatings. Although there are various factors that affect the textures of such ‘nanopapers’, the drying from aqueous dispersion of CNF is the typical process to fabricate them. The basic property on this drying process is focused on, paying attention to the influence of temperature on the macroscopic uniformity. On the one hand, higher drying temperature is advantageous for the fast fabrication. On the other hand, too high temperature leads to significant nonuniformity, are focused on of the film. They propose that this drawback is suppressed by the multi-step coating process. The multi-step coating technique is simple without extra introduction of apparatus or chemical species. Therefore, it is a good option, e.g. when trying to fabricate relatively thin film structures where coffee-ring-like phenomena tend to take place.