Surface Morphology and Viscosity Variations of Chitosan Biopolymer Subjected to Shock Waves Impact
摘要
Chitosan (CS) is a biopolymer which is antimicrobial, antifungal, and biodegradable. It is used in many applications such as biomedical, wastewater treatment, desalination of water, and aerospace industry. Self-derived hydrophobic character and robust mechanical properties, the hybrid carbon aero gel showed stable and durable high electromagnetic interference (EMI) shielding as well as thermal insulation performance, suggesting promising applications in various areas, such as military and aerospace environments. The current objective is to study novel shock wave treatment technique for chitosan material and quantify the effects on its properties. Shock waves are generated in the vertical shock tube, and prepared CS pellets are fixed at the end flange and exposed to the shock impulses. CS pellets are prepared using 1.1 g of raw CS powder by mixing it with 1% concentrated acetic acid of 1.5 ml and ramming the mixture inside the mold and drying it for open atmosphere at 8 h. The CS samples are treated with shock waves of shock Mach number 1.3–1.4 which is generated by varying the driver tube air pressure (P4) from 4 and 6 bar and treated for 50–200 number of shock impulses. The shock treated samples exhibited the significant changes in the morphology by forming the fragmented particles and cavities due to shock waves impacts, and the viscosity reduction of 4–14% is noticed.