In a study published in Advanced Materials ("Exploiting Supramolecular Interactions from Polymeric Colloids for Strong Anisotropic Adhesion between Solid Surfaces"), researchers at Aalto University, the University of Tokyo, Sichuan University, and the University of British Columbia have demonstrated that plant-derived cellulose nanocrystals (CNCs) can form an adhesive that fully integrates the concepts of sustainability, performance, and cost which are generally extremely These kind of properties are useful in protecting fragile components in machines that can undergo sudden physical shock such as high-value components in microelectronics, to increase the reusability of valuable structural and decorative elements, in new solutions for packaging applications, and - in general - for the development of greener adhesive solutions.

Producing a comparable product to a market leader at low cost and with new properties

Furthermore, compared to the current approach of making high-strength glues that can involve complex and expensive routes, the team has demonstrated that their solution is just taking biobased particles sources from plants (with a comparatively negligible cost) and just adding water. Since curing time is associated with evaporation of the water phase (~2 hours, currently), it can be controlled, for instance, with heat.

Aalto Professor Orlando Rojas says, 'Reaching a deep understanding on how the cellulose nanoparticles, mixed with water, to form such an outstanding adhesive is a result of the work between myself, Dr Tardy, Luiz Greca, Professor Hirotaka Ejima, Dr Joseph J. Richardson and Professor Junling Guo and it highlights the fantastic collaboration and integration of knowledge towards the development of an extremely appealing, low-cost and safe application'.

Moreover, the prospects for worldwide utilisation (in a 40B€ industry) is quite attractive given the ever-increasing production of cellulose nanocrystals seen across the globe, as supported by incentives in the framework of the circular bioeconomy.

Dr Tardy adds, 'The truly exciting aspect of this is that although our new adhesive can be sourced directly from residual biomass, such as that from the agro-industry or recycled paper; it outperforms currently available commercial synthetic products by a great many measures'.

Aalto University. Posted: Feb. 24, 2020.

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