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MESA+ News

16 Apr 2014 - UT-Onderzoek laat zien dat nanoluchtbellen superstabiel zijn De enorme wetenschappelijke interesse in nanobellen komt voort uit de mogelijke toepassingen ervan in de microvloeistoffysica en uit de wetenschappelijke uitdaging om de fysieke eigenschappen ervan te beheersen. Eén van de meest opvallende eigenschappen van oppervlakte nanobellen is hun bijzonder lange levensduur gezien hun zeer geringe grootte. Dat de stabiliteit zelfs zo groot is dat nanobellen zelfs aan het kookpunt nog stabiel blijven en tot nucleatie van microdruppels leiden, hebben vier UT-onderzoekers van het MESA+ instituut nu laten zien. De onderzoekers publiceerden hun unieke bevindingen over de stabiliteit van de nanobellen in Physical Review Letters. 16 Apr 2014 - Mega-grant worth 2.5 million for Alexander Golubov Alexander Golubov of the University of Twente has been granted a prestigious mega-grant worth circa 2.5 million euro by the Russian government. The grant is intended for building a new laboratory at the Moscow Institute of Physics and Technology, a highly reputed Russian technical university. 15 Apr 2014 - Don’t gamble, use physics for LED lighting Targeting a desired color for a white light-emitting diode is like spraying a savannah with buckshot in the hope of fortuitously downing a well-hidden deer. Optical engineers collect large amounts of data and perform numerous Monte Carlo simulations to hit upon the right mixture of luminescent phosphor and scatterers for a white LED, one with color characteristics that customers want for their illumination applications. Scientists from the COPS chair and from Philips have reached an understanding of the transport of light in white LEDs in physical terms. It turns out that light scattering can be well understood as a random walk of a drunken sailor with a step size called the mean free path. Moreover, the absorption of blue light is understood as the endpoint of the ran­dom walk. Willem Vos, Vanessa Leung, and their colleagues use this information to propose new design rules in terms of the size step size relative to the thickness of the phosphor layer. They relate the interplay of random walks leading to scattering and those leading to absorption to co-ordinates on a color diagram. This approach provides a physics-driven guide to designing white LEDs, reducing the amount of trial-and-error involved to obtain the optimal color. Their results appear in the leading journal Optics Express that is published by the Optical Society of America. 11 Apr 2014 - Physicists develop new method for manipulating minuscule drops Researchers from the University of Twente MESA+ research institute, the Foundation for Fundamental Research on Matter (FOM) and the Eindhoven University of Technology have, in cooperation with industrial partners ASML and Océ, developed a new method for manipulating minuscule drops.  The fundamental research can be helpful in completely different fields: from minuscule laboratories on chips, to the semiconductor and oil industries. The research was published today in the leading scientific journal Nature Communications. 10 Apr 2014 - UT researchers design new type of microreactor Researchers of the University of Twente's MESA+ research institute have developed a new type of microreactor allowing for the targeted observation of chemical reactions by means of an electric field. The tiny reactor enables one to follow the reaction through the use of infrared spectroscopy, providing the researchers with an improved fundamental insight into the reaction and allowing them to determine the optimum process conditions. Arturo Susarrey-Arce will defend his doctoral thesis on 11 April.  7 Apr 2014 - Ejected droplets generate 20,000 volts Water, a membrane with a tiny hole and a small metal plate: that's all that is required to generate a voltage of 20,000 volts. Researchers from the University of Twente MESA+ research institute have developed a completely new type of electrostatic generator that is able to directly convert the kinetic energy from small ejected droplets into electrical energy. At almost fifty per cent, the conversion efficiency of the system is extremely high. The leading scientific journal Nature Communications publishes the research today.  4 Apr 2014 - Knallende bellen op tv Afgelopen zondag (6 april) werd in het nieuwe wetenschapsprogramma De Kennis van Nu op Nederland 2 aandacht besteed aan het gebruik van microscopisch kleine belletjes voor medische en andere technologische toepassingen. Ruimtevaarder en wetenschapper André Kuipers was voor dit onderwerp op bezoek bij prof. Michel Versluis en de vakgroep Physics of Fluids van de Universiteit Twente.  2 Apr 2014 - More energy from biomass with the right catalyst Fundamental research at MESA+ research institute of the University of Twente shows that the production of hydrogen, derived from for example biomass, can in principle be much more efficient. PhD candidate Shilpa Agarwal demonstrated that the physical form and size of the catalyst CeO2 play a significant part. For example, she showed that cube-shaped nanoparticles of the material possess the highest activity. Agarwal's PhD defence is scheduled for 3 April.