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Former seminars

Seminars

27/05/2015

12.00 pm, Seminar Room on the 1st Floor

The significance of glycosylation to the biopharmaceutical industry

Dr. Richard Easton (SGS Life Sciences, UK)

Glycosylation is an abundant post-translational modification present on glycoproteins from a wide variety of biotechnologically important cell lines. The glycosylation of these different glycoproteins can have a significant impact on the efficacy of the drug and thus the structural nature of the glycans must be understood in order to be controlled..

more information in PDF format (156.02 Kb)

27/05/2015

16.00 pm, Seminar Room on the 1st Floor

Open Group Seminar: Biogenic Plasmonic Structures and Sol-gel Dielectrics for High Density Storage

Prof. Joseph W. Perry (Georgia Institute of Technology, USA)

We are investigating the use of pollens as a microscale platform, with a high surface area and spiky morhophology for the chemisorption of Ag nanoparticles and Ag@SiO2 core shell particles for enhancement of adhesion and optical signals, such as Raman two-photon excited fluorescence signals. In our initial experiments we have used native defatted ragweed (Ambrosia artemisiifolia). The pollen surface was functionalized using aminopropyltriethoxysilane which results in an amine terminated surface and the Ag nanoparticles showed a negative surface charge, allowing for electrostatic adhesion of the nanoparticles. We were able to vary the coverage of the nanoparticles on the pollen. Initial SERS measurements showed that the Raman signals increase with the coverage of the nanoparticles. Adhesion measurements on Si and polystyrene substrates revealed that the adhesive force in pull-off from the substrate increased with Ag or Ag@SiO2 nanoparticle coverage. These particles may have applications in sensing, taggants and security features. Materials with high energy density and extraction efficiency are keys for energy storage applications. We have investigated improved processing methods, in conjunction with the use of nanoscale charge-blocking layers, to develop effective high-k sol-gel materials. Charge-blocking layers with layer thickness in the range of 100 nm to ~1 nm deposited between the dielectric film and the electrodes have led to an order of magnitude reduction of charge injection into the dielectric. I incorporation of nanoscale self-assembled monolayers as charge-blocking layers have led to a very high energy density of 40 J/cm^3 at 830 V/μm. Our investigations provide insights into the development of high-performance dielectric materials/devices from organic/inorganic hybrid materials.

29/05/2015

11.00 pm, Seminar Room on the 1st Floor

Sophisticated nanopatterned metal networks for transparent flexible electrodes and optoelectronic applications

Michael Giersig (Freie University Berlin, Germany)

Novel high performance applications in optoelectronics require highly transparent and highly conductive electrodes (TCEs) for high yields, which are ideally applicable to flexible surfaces. At present, transparent conductive oxides such as indium tin oxide are the dominant TCE materials used in these technologies...

more information in PDF format (167.51 Kb)

29/05/2015

12.00 pm, Seminar Room on the 1st Floor

Colloidally Stable, Water Soluble, Biocompatible, Semiconductor Nanocrystals with a Small Hydrodynamic Diameter

Paul Mulvaney (University of Melbourne, Australia)

We report a simple, economical method for generating water soluble, biocompatible nanocrystals that are colloidally robust and have a small hydrodynamic diameter. The nanocrystal phase transfer technique utilizes a low molecular weight amphiphilic polymer that is formed via maleic anhydride coupling of poly(styrene-co-maleic anhydride) with either ethanolamine or Jeffamine M-1000 polyetheramine...

more information in PDF format (176.26 Kb)

09/06/2015

12.00 pm, Seminar Room on the 1st Floor

Open Group Seminar: Linear and ultrafast plasmonics with individual metal and hybrid nanoparticles

Natalia Del Fatti and Fabrice Vallée (Universite Lyon 1 - CNRS, France)

Understanding and modeling the impact of size, shape and environment on the optical properties of nano-objects is an intense field of research with both fundamental and technological motivations. With the advance of single nanoparticle spectroscopy methods, the optical response of a single nano-object can now be addressed, and its morphology independently determined by electron microscopy, opening the way to precise comparison with theoretical models. In this context we will describe investigation of individual nanoparticles deposited on a substrate, and analyze the influence of the latter on their optical absorption. Experiments are performed using the spatial modulation spectroscopy method, which yields access to the absorption cross-section spectra and amplitude of a single nano-object with size down to a few nanometers. In the case of silica-coated nanorods, isolation from the substrate provided by the silica shell largely reduces interaction with the environment, also allowing investigation of quantum size effects. This is no more the case for bare particles such as gold nanorods or bipyramids deposited on transparent or absorbing substrates. In that case, we show that their surface plasmon resonance (SPR) is strongly modified depending on particle-substrate distance and orientation, as determined by 3D electron tomography. Their nonlinear ultrafast response, investigated by time-resolved pump-probe spectroscopy and providing information on acoustic vibrations, will also be discussed.

14/07/2015

2.00 pm, Seminar Room on the 1st Floor

To Be Announced

Prof. Vladimir Tsukruk (Georgia Institute of Technology, USA)

15/07/2015

12.00 pm, Seminar Room on the 1st Floor

To Be Announced

Prof. Carlito Lebrilla (UC Davis, USA)