Nanotechnology is one of the key technologies of twenty first century. It involves engineering with materials that have size dimension in nanometer range. As important biological entities like virus, pores of biological membranes, proteins, etc also share their sizes in the nanometer ranges; there has been an extensive application of nanotechnology in biology and biomedicine. Nanomaterial based drug delivery offers one of the most useful techniques to administer therapeutics in living cells and tissues. Mesoporous silica nanomaterials act as excellent hosts to store and deliver guest...