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“An exciting development in nanoscience is the formation of materials whereby nanoscale clusters serve as building blocks,” Khanna added. Khanna said cluster assemblies that offer attractive proposition of forming materials with desirable combination of properties was the next frontier in the field of nanoscience. “ Since the properties of clusters change with size and composition, cluster assemblies facilitates forming materials with desirbale combination of properties,” he said. “It has also facilitated medial break throughs for deadly diseases and production of novel drugs by effective catalysts,” he said while addressing an international symposium on “clusters, cluster assemblies and nanomaterials (ISCAN) here the other day. THIRUVANANTHAPURAM: Nanoscience has achieved remarkable developments to serve the evolving needs of society including green energy, reducing pollution, new electronic and magnetic devices, said Shiv Khanna, commonwealth professor at Virginia Commonwealth University..