- The Eurasia Proceedings of Science Technology Engineering and Mathematics
- Vol: 6
- Preparation and Characterization of Na-Alginate Hydrogel Beads
Preparation and Characterization of Na-Alginate Hydrogel Beads
Authors : Mehlika Pulat, Duygu Ozukaya
Pages : 32-38
View : 20 | Download : 4
Publication Date : 2019-07-25
Article Type : Research
Abstract :A series of Na Alginate (Na-Alg) hydrogel beads were prepared by using ionic cross linking method. The beads were obtained by dropping of Na-Alg solution in chilled oil bath at -18 ºC first and then leaving the hardened beads into the cross linker solution. CaCl2 solution was used for ionic cross linking of Na-Alg molecules. While the concentration of Na-Alg solution was kept constant, crosslinking time was changed from 5 to 30 minutes. In general, longer crosslinking times negatively affect hydrogel formation. Swelling behaviors of the hydrogels were studied by changing time, temperature and pH. The higher crosslinker / polymer rates caused lower swelling values. It was determined that the swelling percentages regularly decreased with increasing the crossliking time. While the time increased from 5 to 30 minute, swelling percentages decreased from 158 % to 33 %. Temperature changing negligibly affects the swelling percentages. The prepared Na-Alg hydrogels could not be commended as temperature sensitive.Keywords : Hydrogel, Na-Alginate, CaCl2, Swelling