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(a) Swelling degree of the developed samples: (1) CS-ZnO-6; (2) CS-ZnO-5; (3) CS-ZnO-4; (4) CS-ZnO-3; (5) CS-ZnO-2, and (6) CS-ZnO-1. (b) Porosity of the developed samples: (1) CS-ZnO-6; (2) CS-ZnO-5; (3) CS-ZnO-4; (4) CS-ZnO-3; (5) CS-ZnO-2, and (6) CS-ZnO-1. (* p < 0.05).
