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Visualizzazione post con etichetta waves. Mostra tutti i post
Visualizzazione post con etichetta waves. Mostra tutti i post

venerdì 28 agosto 2020

# gst: self-assembly of chemistry with music

<< audible sound can control chemical reactions in solution by continuously supplying energy sources into the interface between air and the solution.  The sound-controlled air-liquid chemical interactions 'painted' intriguing and aesthetic patterns on the surface and bulk of the solution.>>

<< The Pied Piper of Hamelin tells the mythological story of a pied piper who lured rats away from the city of Hamelin by enchanting them with the music from his magical pipe. With music working like a fuel for such artistic control in chemistry, our study has shown that even synthetic molecules can exhibit life-like behavior—listening and following a musical track, >> Rahul Dev Mukhopadhyay. 

Seeing chemical reactions with music. Institute for Basic Science. Aug 10, 2020.


<< the patterns obtained from artificially designed out-of-equilibrium chemical oscillating networks (such as the Belousov–Zhabotinsky reaction for example) are unpredictable and difficult to control spatiotemporally, albeit reproducible over subsequent cycles. Here, (AA) show that it is possible to generate reproducible spatiotemporal patterns in out-of-equilibrium chemical reactions and self-assembling systems in water in the presence of sound waves, which act as a guiding physical stimulus. >>

Hwang, I., Mukhopadhyay, R.D., Dhasaiyan, P. et al. Audible sound-controlled spatiotemporal patterns in out-of-equilibrium systems. Nat. Chem. 12, 808–813 (2020). doi: 10.1038/ s41557-020-0516-2. Aug 10, 2020.




mercoledì 29 luglio 2020

# gst: controlling particles with sound waves

<< Contactless manipulation of particles and cells using sound radiation forces that can be tuned and adjusted in real time has become important in various applications  (display tech, biomed sensors, imaging devices, diagnostic tools) >>

AA << use phononic crystals to tune sound fields in a microfluidic channel for controllable manipulation of microparticles and cells. An arbitrary stop-and-go motion of particles and cells along a predefined path in the channel is experimentally demonstrated. >>

Fei Li, Feiyan Cai, et al.  Phononic-Crystal-Enabled Dynamic Manipulation of Microparticles and Cells in an Acoustofluidic Channel.  Phys. Rev. Applied 13, 044077. Apr 30, 2020.


Controlling Particle Movements with Sound Waves. Physics 13, s58. Apr 30, 2020.



giovedì 19 marzo 2020

# gst: global dust storms from waves in thin air.

<< Mars has a very thin atmosphere, with nearly one hundredth the density of ours on Earth, and gravity pulls with little more than one third of the strength we feel on our planet. As a result, dust storms can go global. >>

Waves in thin air with broad effects. Instituto de Astrofísica e Ciencias do Espaco. Mar 17, 2020.

https://m.phys.org/news/2020-03-thin-air-broad-effects.html

G.Gilli,  F.Forget, et al. Impact of Gravity Waves on the Middle Atmosphere of Mars: A Non‐Orographic Gravity Wave Parameterization Based on Global Climate Modeling and MCS Observations. Journal of Geophysical Research: Planets. Volume 125, Issue 3.  doi: 10.1029/2018JE005873. Feb 7, 2020.

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JE005873

giovedì 17 ottobre 2019

# gst: fingerprints of reality (2): the stormquake

AA << find that during large storms such as hurricanes and Nor'easters the interaction of long‐period ocean waves with shallow seafloor features located near the edge of continental shelves, known as ocean banks, excites coherent transcontinental Rayleigh wave packets in the 20 to 50 s period band. These "stormquakes" migrate coincident with the storms, but are effectively spatiotemporally focused seismic point sources with equivalent earthquake magnitudes that can be greater than 3.5. >>

Wenyuan Fan, Jeffrey J. McGuire, et al. Stormquakes. Geophysical Research Letters. Oct 14, 2019.    https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL084217  

Strong storms generating earthquake-like seismic activity. Florida State University. Oct 15, 2019.    https://m.phys.org/news/2019-10-strong-storms-earthquake-like-seismic.html 

Also  

fingerprints of reality: water drops that vibrate, flames that oscillate, and viscous fluids that form rivulets ...