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Salisbury, UK, September 2009: – NanoSight, manufacturers of unique nanoparticle characterisation technology, is happy to report that the Laser Zentrum Hannover (LZH) is using the NanoSight nanoparticle characterisation LM-10 system to study metal nanoparticles generated by laser ablation.
The LZH research team of Dr Stephan Barcikowski in conjunction with the Medizinische Hochschule in Hannover has been using nanoparticle tracking analysis (NTA) to study silver nanoparticles generated in situ using laser ablation techniques. Laser-generated nanoparticles show potential for medical applications since they are free of impurities and toxicities. Furthermore, their electrical properties allow a directionally controlled diffusion under externally applied electric fields enabling deposition on conducting surfaces.
Dr Barcikowski chose to use the NanoSight system as it allows particle-to-particle tracking in solution. By capturing the light scattered by the nanoparticles at a frequency of 30 frames per second, the hydrodynamic diameter of the particles may be calculated. The chamber of the system has been modified to take a silver target which is ablated using a Ti:Sapphire laser. Initial ablation (over a short pulse time, e.g. 30 seconds), a range of diameters of particle species are observed in a range of 50-250nm. However, if the ablation process is increased, e.g. to 400 seconds, the distribution shrinks to a single peak of approximately 50nm. This stabilisation process is due to interaction of the freshly generated colloidal particles with the incident laser light. This is essentially a de-agglomeration effect which is in accordance with observations of UV-VIS spectra.
The chamber of the system has been further modified to house a pair of electrodes. This enables the mobility of the nanoparticles to be monitored as a function of their charge. This has been applied to develop an electrodeposition technique which is now being used for the deposition of gold on neuro implant electrodes.
This work was reported at the LPM2008 9th International Symposium on Laser Precision Microfabrication. It clearly shows the relationship of the number of pulses to the hydrodynamic diameter of the nanoparticles being produced, a result that could not have been readily observed using conventional particle characterisation techniques such as electron microscopy or dynamic light scattering. The mobility studies are also not possible using a DLS system giving the NanoSight technology another unique application.
To learn more about nanoparticles and their characterisation using NTA, please visit www.nanosight.com. Register for the latest issue of NanoTrail, the company’s eNewsletter.
NanoSight Ltd, of Salisbury, UK, is the world leading provider of instruments for the optical detection and real time analysis of sub-micron particles. The Company supplies unique instruments for nanoparticle analysis in the sub-micron region that go far beyond existing light scattering techniques in the characterisation of polydispersed systems. Founded in 2004, the company currently has approaching 200 systems in service worldwide, having begun commercial sales in 2006.
The Company’s proprietary knowledge and expertise has enabled the delivery of technologies to blue chip companies and universities for direct visualisation of individual nanoscale particles in suspension from which independent quantitative estimation of particle size, size distribution and concentration are immediately obtained.
The Company has a growing base of users worldwide, including BASF, BP GlaxoSmithKline, Novartis, 3M Corp, Roche, Solvay & Unilever and many universities. For more information, visit www.nanosight.com.
For further information
Please contact NanoSight direct or their marketing agency, NetDyaLog Limited:
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