TY - JOUR
T1 - Morphological properties of airbrush spray-deposited enzymatic cellulose thin films
AU - Ohm, Wiebke
AU - Rothkirch, André
AU - Pandit, Pallavi
AU - Körstgens, Volker
AU - Müller-Buschbaum, Peter
AU - Rojas, Ramiro
AU - Yu, Shun
AU - Brett, Calvin J.
AU - Söderberg, Daniel L.
AU - Roth, Stephan V.
N1 - Publisher Copyright:
© 2018, The Author(s).
PY - 2018/7/1
Y1 - 2018/7/1
N2 - Abstract: We investigate the layer formation of enzymatic cellulose by airbrush spray coating on silicon oxide surfaces. The layer structure and morphology of enzymatic cellulose films in the thickness range between 86 nm and 2.1 µm is determined as a function of the spray coating procedures. For each spray coating step, layer buildup, surface topography, crystallinity as well as the nanoscale structure are probed with atomic force microscopy and surface-sensitive X-ray scattering methods. Without intermittent drying, the film thickness saturates; with intermittent drying, a linear increase in layer thickness with the number of spray pulses is observed. A closed cellulose layer was always observed. The crystallinity remains unchanged; the nanoscale structures show three distinct sizes. Our results indicate that the smallest building blocks increasingly contribute to the morphology inside the cellulose network for thicker films, showing the importance of tailoring the cellulose nanofibrils. For a layer-by-layer coating, intermittent drying is mandatory. Graphical Abstract: [Figure not available: see fulltext.]
AB - Abstract: We investigate the layer formation of enzymatic cellulose by airbrush spray coating on silicon oxide surfaces. The layer structure and morphology of enzymatic cellulose films in the thickness range between 86 nm and 2.1 µm is determined as a function of the spray coating procedures. For each spray coating step, layer buildup, surface topography, crystallinity as well as the nanoscale structure are probed with atomic force microscopy and surface-sensitive X-ray scattering methods. Without intermittent drying, the film thickness saturates; with intermittent drying, a linear increase in layer thickness with the number of spray pulses is observed. A closed cellulose layer was always observed. The crystallinity remains unchanged; the nanoscale structures show three distinct sizes. Our results indicate that the smallest building blocks increasingly contribute to the morphology inside the cellulose network for thicker films, showing the importance of tailoring the cellulose nanofibrils. For a layer-by-layer coating, intermittent drying is mandatory. Graphical Abstract: [Figure not available: see fulltext.]
KW - Cellulose
KW - Grazing incidence X-ray scattering
KW - Spray coating
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=85046905803&partnerID=8YFLogxK
U2 - 10.1007/s11998-018-0089-9
DO - 10.1007/s11998-018-0089-9
M3 - Article
AN - SCOPUS:85046905803
SN - 1547-0091
VL - 15
SP - 759
EP - 769
JO - Journal of Coatings Technology and Research
JF - Journal of Coatings Technology and Research
IS - 4
ER -