Biomimetic Inks Based on Cellulose Nanofibrils and Cross-Linkable Xylans for 3D Printing
Artikel i vetenskaplig tidskrift, 2017

This paper presents a sustainable all-wood-based ink which can be used for 3D printing of constructs for a large variety of applications such as clothes, furniture, electronics, and health care products with a customized design and versatile gel properties. The 3D printing technologies where the material is dispensed in the form of liquids, so called inks, have proven suitable for 3D printing dispersions of cellulose nanofibrils (CNFs) because of their unique shear thinning properties. In this study, novel inks were developed with a biomimetic approach where the structural properties of cellulose and the cross-linking function of hemicelluloses that are found in the plant cell wall were utilized. The CNF was mixed with xylan, a hemicellulose extracted from spruce, to introduce cross-linking properties which are essential for the final stability of the printed ink. For xylan to be cross-linkable, it was functionalized with tyramine at different degrees. Evaluation of different ink compositions by rheology measurements and 3D printing tests showed that the degree of tyramine substitution and the ratio of CNFs to xylan-tyramine in the prepared inks influenced the printability and cross-linking density. Both two-layered gridded structures and more complex 3D constructs were printed. Similarly to conventional composites, the interactions between the components and their miscibility are important for the stability of the printed and cross-linked ink. Thus, the influence of tyramine on the adsorption of xylan to cellulose was studied with a quartz crystal microbalance to verify that the functionalization had little influence on xylan's adsorption to cellulose. Utilizing xylan-tyramine in the CNF dispersions resulted in all-wood-based inks which after 3D printing can be cross-linked to form freestanding gels while at the same time, the excellent printing properties of CNFs remain intact.

cross-linking

composite

cellulose nanofibrils

hemicellulose

3D printing

Författare

Kajsa Markstedt

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Alfredo Escalante

Universidad de Guadalajara

Guillermo Toriz Gonzalez

Universidad de Guadalajara

Wallenberg Wood Science Center (WWSC)

Paul Gatenholm

Wallenberg Wood Science Center (WWSC)

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. 9 40878-40886

Drivkrafter

Hållbar utveckling

Styrkeområden

Building Futures

Ämneskategorier

Kemiteknik

Kemi

DOI

10.1021/acsami.7b13400