| 초록 |
We describe novel fabrication of a bacterial cellulose(BC) actuator string with simple manufacturing and functions attractive in medical applications. Despite controlled biosynthesis of BC hollow structures using emulsion and fluidics, shape control of the BC skin layer enveloping colloidal suspensions is challenging. We adopt solid matrix-assisted printing(SMAP) to enable flexible design and fabrication of 3D structures. Due to the supply of oxygen through the gaps between hydrophobic particles in the matrix, a BC skin can be fabricated at the surface of a medium containing magnetic nanoparticles(MNPs) by metabolic activity of bacteria. Since the soft nanofibrous BC skin is enveloping an MNP suspension, the BC actuator string slides smoothly and bends sharply under an external magnetic field. The low coefficient of friction of the BC skin enables facile movement through the ureter, and the low compressive modulus can reduce vertical drag to minimize potential infection. |
