Wed, 09 Jul 2008 18:49:46 BST CiteULike: dchen's bubbles http://www.citeulike.org/user/dchen/tag/bubbles CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2767692 <i>Physical Review Letters, Vol. 100, No. 7. (2008)</i><br /><br />Previous works on single bubble sonoluminescence in sulfuric acid solutions have stressed the fact that the sonoluminescence (SL) emissions are the highest ever found, but at the same time the bubble moves in orbits. We have fixed the SL bubble spatially and at the same time we have reached higher SL emissions using another harmonic acoustic signal to produce the acoustic excitation. Multiple harmonic excitation produces up to a fourfold increase in SL emissions, reaching the peak value of about 40 µW for a moving bubble and 15 µW for a nonmoving bubble. The ability to have a bright stationary bubble also opens new research opportunities. In particular, we develop a new method to measure the absolute radius evolution of the bubble that exploits this stability. Trapping an Intensely Bright, Stable Sonoluminescing Bubble Raúl Urteaga Fabián Bonetto doi:10.1103/PhysRevLett.100.074302 Physical Review Letters, Vol. 100, No. 7. (2008) 2008-05-07T23:29:17-00:00 2008 Physical Review Letters 100 7 APS 2008 bubbles cool http://www.citeulike.org/user/dchen/article/2753716 <i>Physical Review Letters, Vol. 98, No. 20. (2007)</i><br /><br />Shock wave induced cavitation experiments and atomic force microscopy measurements of flat polyamide and hydrophobized silicon surfaces immersed in water are performed. It is shown that surface nanobubbles, present on these surfaces, do not act as nucleation sites for cavitation bubbles, in contrast to the expectation. This implies that surface nanobubbles are not just stable under ambient conditions but also under enormous reduction of the liquid pressure down to -6 MPa. We denote this feature as superstability. Superstability of Surface Nanobubbles Bram Borkent Stephan Dammer Holger Schönherr Julius Vancso Detlef Lohse doi:10.1103/PhysRevLett.98.204502 Physical Review Letters, Vol. 98, No. 20. (2007) 2008-05-04T16:08:51-00:00 2007 Physical Review Letters 98 20 APS 2007 bubbles focus material nano http://www.citeulike.org/user/dchen/article/2606116 <i>Physical Review Letters, Vol. 93, No. 1. (2004)</i><br /><br />Measurements of average velocity profiles in a bubble raft subjected to slow, steady shear demonstrate the coexistence between a flowing state and a jammed state similar to that observed for three-dimensional foams and emulsions [P. Coussot et al., Phys. Rev. Lett. 88, 218301 (2002)]. For sufficiently slow shear, the flow is generated by nonlinear topological rearrangements. We report on the connection between this short-time motion of the bubbles and the long-time averages. We find that velocity profiles for individual rearrangement events fluctuate, but a smooth, average velocity is reached after averaging over only a relatively few events. Velocity Profiles in Slowly Sheared Bubble Rafts John Lauridsen Gregory Chanan Michael Dennin doi:10.1103/PhysRevLett.93.018303 Physical Review Letters, Vol. 93, No. 1. (2004) 2008-03-28T12:36:40-00:00 2004 Physical Review Letters 93 1 APS bubbles shear shearband http://www.citeulike.org/user/dchen/article/2711079 <i>Physics of Fluids, Vol. 16, No. 8. (2004), pp. 2828-2834.</i><br /><br />View This Record in Scopus A new device for the generation of microbubbles José Gordillo Zhengdong Cheng Alfonso M Márquez DA Weitz Physics of Fluids, Vol. 16, No. 8. (2004), pp. 2828-2834. 2008-04-24T00:28:26-00:00 2004 Physics of Fluids 16 8 2828 2834 AIP bubbles microrheology weitz