A summary of results obtained in Working Group 002 "Synthesis and Processing of Nanopowders"
Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
The area of research of the working group includes:
- Methods of synthesis of nanopowders,
- Development of high pressure reactors for nanopowders synthesis
- Characterisation of nanopowders
- Their applications
Nanopowders are powders with particle size below 100 nm. Nanopowders are produced in industrial scale since long time, e.g., carbon black, silica, titania etc. However, recently much interest is in nanopowders of high commercial value due to their specific optical and magnetic properties that result from nano-size.. Furthermore, from nanopowders, or using nanopowders, one can produce nanocrystalline materials or nanocomposites of radically improved strength. Nanopowders do already play an important role in many industrial fields, and the field of their application will continuously increase in future.
1. One of major barriers in the science and technology of nanopowders is that high value nanopowders need to be produced with well controlled and narrow grain size distribution, and these parameters are difficult to control and measure.
2. Wet chemistry methods for their production are usually cheap, but after such synthesis processes nanoparticles are frequently coated with a layer of untreated reaction precursors. Therefore a major issue is to obtain nanoparticles of high degree of crystallinity.
3. It is worth developing technology of nanopowders with engineered magnetic or optical properties. An efficient method to add to nanopowders controlled magnetic or optical properties is to dope them with ions of metals which have themselves magnetic or optical properties. These ions are then protected from the environment since they are embedded in a stable oxide lattice, and at the same time this particle is so small, that it can be embedded in various materials like polymers, textiles, other ceramics, dispersed in fluids, or used for imaging cells. Adding value to nanoparticles requites synthesis methods that permit to dope the nanoparticles to high level with such ions, without their segregation as clusters.
4. It is important to be able to coat the nanopowders with functional layers which enhance their sintering into usable mechanical parts or dispersion in fluids, or attaching to selected surfaces. . Such a process is impossible in high temperature production processes.
5. Therefore, there is a need for innovative synthesis methods that would permit to scale up production of nanopowders and at the same time meet all the above criteria, and for commonly agreed characterisation procedures to ensure delivery of quality nanopowders.
The above issues have been addressed by our working group and solutions found will be reported bellow.
The general conclusion is that: “High Pressure Technology for production and processing nanopowders is now a fact that needs to be taken into account by the scientific and industrial communities”
WG D30/003 Papers
1. Study of Grain Size Distribution in Nanocrystalline Iron Oxides Synthesized by Hydrothermal Method, Solid State Phenomena 94, 239 (2003),
2. New hydroxyapatite based nanomaterials for potential use in medical field, Annals of Transplantation, 9, 20 (2004), R. M. Piticescu, G.C. Chitanu. M.L. Popescu, W. Lojkowski, A. Opalinska, T. Strachowski,
3. Biocompatibility of hydroxyl-apatite thin films obtained by pulsed laser depositionReviews on Advanced Materials Science, 8,: 164, (2004), M.L Popescu. R.M., Piticescu , S. Petrescu, L.Zdrentu, I.Mihailescu, G.Socol, W.Lojkowski
4. Hybrid HAp-maleic anhydride copolymer nanocomposites obtained by in-situ functionalisation, Solid State Phenomena: 6, 47 (2005), R.M. Piticescu, C.C. Chitanu, M. Albulescu, M. M. Giurginca, L. Popescu, W. Lojkowski,
5. Application of image analysis for characterization of powdersMaterials Science - Poland, 23, 79, (2005), J. Michalski, T.Wejrzanowski, R.Pielaszek, K. Konopka, W.Lojkowski, K.J. Kurzydlowski.
6. Chemical Synthesis of nanostructured Powders and Films with controlled Properties, Proceedings of the International Conference on Materials Science and Engineering, Brasov, Romania, 24-26 February 2005, ISBN 973-635-454-7, R. M Piticescu., R. R.Piticescu, V.Badilita, C.Monty, F.Sibieude and W. Lojkowski
7. Quantitative methods for nanopowders characterization, T,. Wejrzanowski R, . Pielaszek A. Opalinska, H. Matysiak, Lojkowski W,. K.J. Kurzydlowskx, APPLIED SURFACE SCIENCE, 253: 204-208 (2006)
8. Effect of Pressure on Synthesis of Pr-Doped Zirconia Powders Produced by Microwave-Driven Hydrothermal Reaction, Journal of Nanomaterials, Volume 2006, Article ID 98769, Pages 1–8, A. Opalinska, C. Leonelli, W. Lojkowski, R. Pielaszek, E. Grzanka T. Chudoba, H. Matysiak, T.Wejrzanowski, and K. J. Kurzydlowski
9. Magnetic properties of ZnMnO nanopowders solvothermally grown at low temperature from zinc and manganese acetate, Applied Physics Letters 89, 242102 (2006), A. Tomaszewska-Grzeda, A. Opalińska, E. Grzanka, and W. Łojkowski, A. Gedanken, M. Godlewski, S. Yatsunenko V. Osinniy, and T. Story
10. Synthesis of nanoparticulate yttrium aluminum garnet in supercritical water–ethanol mixtures, J. of Supercritical Fluids 40, 284 (2007) , A Cabanas., Jun Li, P., Blond, T.Chudoba, W.Lojkowski, M. Poliakoff, E.Lester
11. Nanometrology. Editors Witold Łojkowski et al, Nanoforum report 2007, www.nanoforum,org
12. Zirconia Based Nanomaterials for Oxygen Sensors – Generation, Characterisation and Optical Properties, J.D. Fidelus, W.Lojkowski, D. Millers, L. Grigorjeva, K. Smits, and R.R. Piticescu, Solid State Phenomena 141, Vol. 128, (2007)
13. Morphology and luminescence properties of zinc oxide nanopowders doped with aluminium ions obtained by hydrothermal and vapour condensation methods., J. Applied Physics, in Press., T. Strachowski, E. Grzanka, W. Lojkowski, A. Presz M. Godlewsk, S. Yatsunenko, H. Matysiak, R.R. Piticescu, C.J. Monty
14. Solvothermal synthesis of submicron zinc oxide doped with Mn2+, Ni2+, Co2+ and Cr2+ ions by means of a microwave reactor, A. Gedanken, W. Łojkowski, A. Tomaszewska Grzęda, A. Opalińska, E. Grzanka, M. Godlewski, J of Phys Chem of Solids, submitted
Presentation: Invited at COST D30 Final Evaluation Meeting, by Witold Łojkowski
See On-line Journal of COST D30 Final Evaluation Meeting
Submitted: 2007-09-23 23:31 Revised: 2009-06-07 00:44
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