@article{article_602914, title={Preparation and Characterization of Na-Alginate Hydrogel Beads}, journal={The Eurasia Proceedings of Science Technology Engineering and Mathematics}, volume={6}, pages={32–38}, year={2019}, author={Pulat, Mehlika and Ozukaya, Duygu}, keywords={Hydrogel,Na-Alginate,CaCl2,Swelling}, abstract={<p> <span style="font-size: 10pt; line-height: 115%; font-family: "Times New Roman", serif;">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. </span> <br> </p>}, publisher={ISRES Publishing}