Browsing by Author "Nambiar, M"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Fabrication of titania nanotube membranes by atomic layer deposition using nanoporous alumina as a template
    (Engineers Australia, 2011-09-18) Evans, PJ; Triani, G; Nambiar, M; Shapter, JG; Losic, D
    Conformal TiO2 films have been deposited onto highly oriented porous alumina arrays to characterise membranes with controlled pore modification. A suite of tools have been used to probe the evolution of these coated porous structures. Depth profiling by secondary ion mass spectroscopy revealed the distribution of elements Ti and O deposited throughout the coated porous alumina. High resolution imaging using scanning electron microscopy confirmed the reduction in pore-size as a function of deposition cycles. Following the removal of the porous alumina template, free-standing titania nanotubes were prepared which show the pore geometry of the alumina template was preserved. ©2011 Engineers Australia
  • No Thumbnail Available
    Item
    Study of titania modified porous alumina membranes for protein transport and separation
    (Engineers Australia, 2011-09-18) Nambiar, M; Evans, PJ; Triani, G; Shapter, JG; Losic, D
    The use of nanoporous membranes in molecular separation or sieving, which involve the separation of molecular mixtures, is gaining rapid interest. The ability to modify and alter their pore size and dimensions, along with the physical and chemical properties of the material that constitute these pores make them highly sensitive to such applications, particularly protein separation. Our study investigated the use of titania modified porous anodic alumina (AAO) membranes. Titania was deposited using atomic layer deposition (ALD) for different number of cycles in order to generate membranes with reduced poresizes ranging from 100nm-10nm. Protein permeation experiments using bovine serum albumin (BSA) and Lysozyme (Lys) were conducted to show selectivity in transport and separation of the proteins. Transport occurred by diffusion and a subsequent decrease in flow rate was observed with decrease in pore size of the membranes. In addition, the use of titania modified AAO membranes demonstrated minimal extent of non-specific absorption of proteins along the pores during permeation when subject to UV radiation. The resultant titania coated AAO membranes achieved controlled reduction of pore size using ALD and are thus, applicable for advanced protein transport, separation and catalysis. © 2011 Engineers Australia