Dr. Dusan Losic Profile

Dr. Dusan Losic

Associate Research Professor at Univ of Adelaide

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Publications (6)

Proceedings Article | 9 December 2016 Paper

Modulating molecular transport across peptide-modified nanoporous alumina membranes with light

Tushar Kumeria, Jingxian Yu, Mohammed Alsawat, Mahaveer Kurkuri, Abel Santos, Andrew Abell, Dusan Losic

Proceedings Volume 10013, 100131W (2016) https://doi.org/10.1117/12.2241495

KEYWORDS: Molecules, Modulation, Chemistry, Biomedical optics, Polymers, Switching, Silicon, Atomic force microscopy, Spectroscopy, Switches

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Proceedings Article | 11 September 2013 Paper

Nano-engineered titanium for enhanced bone therapy

Karan Gulati, Gerald Atkins, David Findlay, Dusan Losic

Proceedings Volume 8812, 88120C (2013) https://doi.org/10.1117/12.2027151

KEYWORDS: Bone, Titanium, Nanolithography, Polymers, Scanning electron microscopy, Cancer, Magnesium, Oncology, Biopolymers, Absorbance

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Proceedings Article | 24 December 2011 Paper

Reflectometric interference biosensing using nanopores: integration into microfluidics

Tushar Kumeria, Mahaveer Kurkuri, Kerrilyn Diener, Chen Zhang, Luke Parkinson, Dusan Losic

Proceedings Volume 8204, 82043C (2011) https://doi.org/10.1117/12.903217

KEYWORDS: Sensors, Microfluidics, Molecules, Biosensing, Aluminum, Refractive index, Gold, Reflectivity, Interferometry, Reflectance spectroscopy

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Proceedings Article | 30 December 2008 Paper

Diatom culture media contain extracellular silica nanoparticles which form opalescent films

Dusan Losic, James Mitchell, Nicolas Voelcker

Proceedings Volume 7267, 726712 (2008) https://doi.org/10.1117/12.811321

KEYWORDS: Silica, Nanoparticles, Scanning electron microscopy, Microscopy, Atomic force microscopy, Nanolithography, Cell death, Optical filters, Silicon, Optical microscopy

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Proceedings Article | 30 December 2008 Paper

Pore spanning lipid bilayers on silanised nanoporous alumina membranes

Abdul Md Jani, Jinwen Zhou, Matthew Nussio, Dusan Losic, Joe Shapter, Nicolas Voelcker

Proceedings Volume 7267, 72670T (2008) https://doi.org/10.1117/12.808769

KEYWORDS: Aluminum, Scanning electron microscopy, Atomic force microscopy, Imaging spectroscopy, FT-IR spectroscopy, Solids, Proteins, Infrared spectroscopy, Spectroscopy, Silicon

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The preparation of bilayer lipid membranes (BLMs) on solid surfaces is important for many studies probing various important biological phenomena including the cell barrier properties, ion-channels, biosensing, drug discovery and protein/ligand interactions. In this work we present new membrane platforms based on suspended BLMs on nanoporous anodic aluminium oxide (AAO) membranes. AAO membranes were prepared by electrochemical anodisation of aluminium foil in 0.3 M oxalic acid using a custom-built etching cell and applying voltage of 40 V, at 1^oC. AAO membranes with controlled diameter of pores from 30 - 40 nm (top of membrane) and 60 -70 nm (bottom of membrane) were fabricated. Pore dimensions have been confirmed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). AAO membranes were chemically functionalised with 3-aminopropyltriethoxysilane (APTES). Confirmation of the APTES attachment to the AAO membrane was achieved by means of infrared spectroscopy, X-ray photoelectron spectroscopy and contact angle measurements. The Fourier transform infrared (FTIR) spectra of functionalised membranes show several peaks from 2800 to 3000 cm^-1 which were assigned to symmetric and antisymmetric CH₂ bands. XPS data of the membrane showed a distinct increase in C1s (285 eV), N1s (402 eV) and Si2p (102 eV) peaks after silanisation. The water contact angle of the functionalised membrane was 80^o as compared to 20^o for the untreated membrane. The formation of BLMs comprising dioleoyl-phosphatidylserine (DOPS) on APTESmodified AAO membranes was carried using the vesicle spreading technique. AFM imaging and force spectroscopy was used to characterise the structural and nanomechanical properties of the suspended membrane. This technique also confirmed the stability of bilayers on the nanoporous alumina support for several days. Fabricated suspended BLMs on nanoporous AAO hold promise for the construction of biomimetic membrane architectures with embedded transmembrane proteins.

Proceedings Article | 30 December 2008 Paper

Atomic layer deposition of SIO2 on porous alumina membranes: controlling the pore size and transport properties

Leonora Velleman, Gerry Traini, Peter Evans, Armand Atanacio, Joe Shapter, Dusan Losic

Proceedings Volume 7267, 72670S (2008) https://doi.org/10.1117/12.810716

KEYWORDS: Atomic layer deposition, Silica, Scanning electron microscopy, Molecules, Chemistry, Coating, Ions, Biosensing, Self-assembled monolayers, Silicon

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