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Journal Publications

A facile aqueous sol–gel method for high surface area nanocrystalline CeO2

P. Periyat, F. Laffir, S. A. M. Tofail and E. Magner

Thermally stable high surface area nanocrystalline CeO2 was synthesized via an aqueous sol–gel method using cerium hydroxide and urea as precursors. The CeO2 sol is yellow colored and absorbs light over the range 200–500 nm. Nanocrystalline CeO2 particles derived from the sol are spherical in shape and range from 9 to 13 nm in diameter. The CeO2 powder has a high surface area of up to 85 m2 g−1 and a band gap of 3.1 eV. The method of preparation is facile, utilises low cost reagents and can be performed on a large scale.

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Directly created electrostatic micro-domains on hydroxyapatite: probing with a Kelvin Force probe and a protein

 

Plecenik, Tomas; Robin, Sylvain; Gregor, Maros; Truchly, Martin; Lang, Sidney; Gandhi, Abbasi; Zahoran, Miroslav; Laffir, Fathima; Soulimane, Tewfik; Vargova, Melinda; Plesch, Gustav; Kus, Peter; Plecenik, Andrej; Tofail, S. A. M.


Micro-domains of modified surface potential (SP) were created on hydroxyapatite films by direct patterning by mid-energy focused electron beam, typically available as a microprobe of Scanning Electron Microscopes. The SP distribution of these patterns has been studied on sub-micrometer scale by the Kelvin Probe Force Microscopy method as well as lysozyme adsorption. Since the lysozyme is positively charged at physiological pH, it allows us to track positively and negatively charged areas of the SP patterns. Distribution of the adsorbed proteins over the domains was in good agreement with the observed SP patterns.

 

Last Updated (Tuesday, 13 December 2011 13:06)

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Charge Specific Protein Placement at Submicrometer and Nanometer Scale by Direct Modification of Surface Potential by Electron Beam

Sylvain Robin, Abbasi A. Gandhi, Maros Gregor, Fathima R. Laffir, Tomas Plecenik, Andrej Plecenik, Tewfik Soulimane, and Syed A. M. Tofail


The understanding and the precise control of protein adsorption is extremely important for the development and optimization of biomaterials. The challenge resides in controlling the different surface properties, such as surface chemistry, roughness, wettability, or surface charge, independently, as modification of one property generally affects the other. We demonstrate the creation of electrically modified patterns on hydroxyapatite by using scanning electron beam to tailor the spatial regulation of protein adsorption via electrostatic interactions without affecting other surface properties of the material. We show that domains, presenting modulated surface potential, can be created to precisely promote or reduce protein adsorption.

Last Updated (Tuesday, 13 December 2011 13:08)

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Journal of Colloid And Interface Science Publication

 

Article title: In situ photoexcitation of silver doped titania nanopowders for activity against bacteria and yeasts

Journal title: Journal of Colloid And Interface Science


Abstract Photocatalytic and in situ microbial activity of the amorphous and annealed states of Ag-doped and un-doped titania, were examined. Studies on their structure, morphology, composition and the photo-absorption characteristics of these materials, were performed.

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