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Drop formation: Methods and applications

Posted 09 Sep, 2008 in Publications

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Contributor(s) Pradeep P. Bhat
Purdue University
Abstract

It is our common experience to see water drip out of a leaky faucet in, say, a kitchen sink. While dripping in this case may be an unwanted process, it can gainfully be employed as one of the methods, among a host of different techniques, to produce drops of various liquids for useful purposes. Production of drops, of various sizes and numbers, is used in a variety of applications ranging from crop sprays to printing and patterning on different substrates. In this short write-up, brief descriptions of several different methods available for the production of drops in such applications are included. Mainly, techniques that are used to produce micron sized (in diameter) drops are highlighted and their use in many of the emerging applications such as printing of three-dimensional arrays of biological cells and printing of flexible electronics are discussed.


image

Schematics showing the production of drops through (a) electrohydrodynamic (EHD) tip streaming and (b) flow-focusing.

bio The author is a postdoctoral research associate at the School of Chemical Engineering in Purdue University. He holds a Ph.D. degree from Rice University, Houston, Texas, in chemical engineering. At Purdue, the author's research work is supervised by Professor Osman A. Basaran, who is affiliated to the School of Chemical Engineering and is Reilly Professor of Fluid Mechanics there.
credits Pradeep P. Bhat and Osman A. Basaran
School of Chemical Engineering
Purdue University, West Lafayette, IN 47907
references
  1. BARRERO, A. and LOSCERTALES, I. G. 2007 Micro- and nanoparticles via capillary flows. Annu. Rev. Fluid Mech. 39(89)
  2. BASARAN, O. A. 2002 Small-scale free surface flows with breakup: Drop formation and emerging applications. AIChE J. 48(1842)
  3. BASARAN, O. A. and SURYO, R. 2007 The invisible jet. Nat. Phys. 3(679)
  4. CALVERT, P. 2007 Printing cells. Science 318(208)
  5. COLLINS, R. T. et al. 2007 Electrohydrodynamic tip streaming and emission of charged drops from liquid cones. Nat. Phys. 4(149)
  6. COOKS, R. G. et al. Ambient mass spectrometry. Science 311(1566)
  7. HOTH, C. et al. 2007 High photovoltaic performance of inkjet printed polymer:fullerene blends. Adv. Mater. 19(3973)
  8. HOTH, C. et al. 2008 Printing highly efficient organic solar cells. Nano Lett. 8(2806)
  9. SIRRINGHAUS, H. et al. 2000 High-resolution inkjet printing of all-polymer transistor circuits. Science 290(2123)
  10. TAYLOR, G. I. 1964 Disintegration of water drops in an electric field. Proc. R. Soc. London Ser. A 280 (383)
Cite this work

If you reference this work in a publication, please cite as follows:

  • Pradeep P. Bhat (2008), "Drop formation: Methods and applications," http://pharmahub.org/resources/268.

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Tags
  1. drop formation
  2. drop-on-demand
  3. ink-jet printing
  4. microfabrication
  5. micromanufacturing