Surface Wrinkles Induced on Oriented Chitosan Films via Horseradish Peroxidase-catalyzed Reaction and Drying

Abstract

Oriented chitosan films, prepared by elongation, are applied to a surface wrinkling system via a horseradish peroxidasecatalyzed surface reaction of ferulic acid and drying. The wrinkle morphologies of the obtained films are strongly affected by drying compression stress inverse to the elongation direction, probably caused by an entropic spring. The most oriented chitosan film elongated until a fracture strain showed a herringbone-like pattern produced by parallel and orthogonal compression stresses to the orientation direction.

Dry and wet wrinkling of a silk fibroin biopolymer by a shape-memory material with insight into mechanical effects on secondary structures in the silk network

“…[24][25][26][27][28] Further, surface wrinkles fabricated using synthetic polymers often do not facilitate cell adhesion without additional surface functionalization. 3,13 Biopolymer films, including chitosan, polydopamine, and silk fibroin (SF), [29][30][31][32] have the potential to address many of the limitations of metal or synthetic polymer films and thereby provide new options for generating surface wrinkles on the surfaces of active materials. Unlike metal films, biopolymer films are relatively transparent and can possess innate or tailorable bioactivity.…”

“…Unlike metal films, biopolymer films are relatively transparent and can possess innate or tailorable bioactivity. [29][30][31] Generally being aqueously soluble, many biopolymers can also be deposited uniformly on complex surfaces or throughout porous structures through processes that include spin coating, 32 dip coating, 33,34 and molecular selfassembly. 25 Despite the potential for biopolymer wrinkling on active materials to advance the materials science of wrinkling, surface functionalization of active materials, and fields in which both wrinkles and active materials are being employed or studied, study of biopolymer wrinkling on active materials has to date been limited.…”

“…Unlike metal films, biopolymer films are relatively transparent and can possess innate or tailorable bioactivity. 29–31 Generally being aqueously soluble, many biopolymers can also be deposited uniformly on complex surfaces or throughout porous structures through processes that include spin coating, 32 dip coating, 33,34 and molecular self-assembly. 25…”