3D Bioplotter Research Papers

The flow-induced supramolecular arrangement, or band texture, present in water-soluble anisotropic films prepared from blend solutions of hydroxypropyl cellulose and organosolv lignin is locked via esterification with bio-based polycarboxylic acids. Subsequent to shear casting of the blend solutions, the chemical cross-linking with citric acid-based cross-linkers and a dimerized fatty acid yields water-insoluble, anisotropic films prone to swelling in water. The liquid crystalline networks are analyzed by means of polarized optical microscopy, tensile testing, Fourier transform infrared, and swelling experiments. Depending on the cross-linker, the dry “banded” films reach up to 3.5 GPa in tensile modulus, 80 MPa in tensile strength…

Following the recent demonstration of the potential to direct ink write lyotropic blends of organosolv lignin (OSL) and hydroxypropyl cellulose (HPC), this study aims to optimize the formulations and direct ink writing parameters for fully bio-based lignin/HPC inks. A prescreening identifies the theoretical window of printability for different compositions for formulations based on OSL solutions of 45, 47.5, and 50% solid contents and OSL/HPC wt %/wt % ratios of 30/70, 40/60, and 50/50. Measurements of shear–viscosity and recovery behavior evidence the shear-thinning contribution of HPC and the viscosity recovery contribution of lignin. Shape fidelity, morphology, and mechanical properties of printed…