Two glass samples BS1 [(Na2O)0.22 (B2O3)0.05(SiO2)0.69(Al2O3)0.011(K2O)0.029] and BS2 [(Na2O)0.025(B2O3)0.245(SiO2)0.69(Al2O3)0.011(K2O)0.029] were prepared by the conventional melt-quench method. The ion exchange properties of these samples were studied using Cu2+ and Zn2+ ions. Based on these studies, it is seen that BSI has higher ion exchange capacity than BS2. This is due to more number of nonbridging oxygen atoms present in the BS1 glass as revealed by the 29Si and 11B magic angle spinning nuclear magnetic resonance (MAS NMR) studies. Moreover, it is found that BS1 has more affinity for Cu2+ than Zn2+. This is due to the formation of Cu2+ clusters as confirmed by ESR study.

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1. Effect of modifiers on the ion exchange properties of borosilicate glasses