Rapid Electroformation of Biopolymer Gels in Prescribed Shapes and Patterns: A Simpler Alternative to 3-D Printing
| Autor: | William E. Bentley, Sohyun Ahn, Srinivasa R. Raghavan, Ankit Gargava |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Alginates 02 engineering and technology engineering.material 010402 general chemistry medicine.disease_cause 01 natural sciences law.invention Diffusion chemistry.chemical_compound Biopolymers law Mold medicine Electrochemistry General Materials Science Direct current 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Anode Electrophoresis Kinetics Chemical engineering chemistry Printing Three-Dimensional engineering Agarose Biopolymer 0210 nano-technology Rheology Layer (electronics) Gels |
| Zdroj: | ACS applied materialsinterfaces. 11(40) |
| ISSN: | 1944-8252 |
| Popis: | We demonstrate the use of electric fields to rapidly form gels of the biopolymer alginate (Alg) in specific three-dimensional (3-D) shapes and patterns. In our approach, we start with a gel of the biopolymer agarose, which is thermoresponsive and hence can be molded into a specific shape. The agarose mold is then loaded with Ca2+ cations and placed in a beaker containing an Alg solution. The inner surface of the beaker is surrounded by aluminum foil (cathode), and a copper wire (anode) is stuck in the agarose mold. These are connected to a direct current (DC) power source, and when a potential of ∼10 V is applied, an Alg gel is formed in a shape that replicates the mold. Gelation occurs because the Ca2+ ions electrophoretically migrate away from the mold, whereupon they cross-link the Alg chains adjacent to the mold. At low Ca2+ (0.01 wt %), the Alg gel layer grows outward from the mold surface at a steady rate of about 0.8 mm/min, and the gel stops growing when the field is switched off. After a gel of d... |
| Databáze: | OpenAIRE |
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