Piezodropper

Computer controlled Piezoelectric Droplet Generator
Price 6000.- Euros ex. VAT (1.02.2009)

To test different optical particle sizing intruments a piezoelectric droplet generator has been developed.
This will generate single droplets or a stream of monodisperse droplets. The Piezodropper can also be
used for microdosing applications. Please send an email if you are interested in this device.

Parameters of the Piezodropper

fully computer controlled
droplets of high uniformity and quality
excellent long-time stability
nozzle diameter: 20-100 µm
droplet diameter: 20-100 µm
droplet volume: 0.5-500 pl
droplet velocity: ~ 2 m/s
droplet rate: 0 (single shot) up to 3 kHz
viscosity: < 100 mPa*s (d = 40 µm)
minimum volume of liquid needed for droplet generation 4,5 – 6,8 µl
(depending on the type of Piezodropper)
very easy to clean and dry by pressing liquid continuously through the Piezodropper
and drying with gas flow (1 bar)
cleaning takes only a few seconds
suitable for liquids such as water, 20 % glycerol, DMSO, 1 % Triton
or suspensions of latex spheres in water
length of nozzle below piezo 6-8 mm

Piezodropper Demostration Video

Piezodropper computer controlled
The new Piezodropper developed in 2004 is fully computer controlled. Using a graphical user interface or the
Piezodropper software driver in your own C++ program you will be able to set the droplet rate, total number of
droplets and size of droplets in a certain range of about 2 : 1 in diameter. Additionally you will be able to define
special driving signals, durations and amplitudes.

Price
The price of the Piezodropper will be about 6000.- Euros excluding VAT. This includes a computer plug in board,
electronics, LED flash light, holder, glass vessel and software. (You would have to provide a Windows based PC.)
Please send an email for a quotation.

References

[1] Piezodropper leaflet 22.7.2004

[2] H. Ulmke, T. Wriedt, H. Lohner, K. Bauckhage:: The Piezoelectric Droplet Generator: A Versatile Tool for Dispensing Applications and Calibration of Particle Sizing Instruments. Pat McKeown et al. (editor): Precision Engineering - Nanotechnology, Proceedings of the 1st International euspen Conference, Vol. 2, Shaker Verlag, Aachen 1999, page 290-293.
[3] H. Ulmke, M. Mitschke, K. Bauckhage: Piezoelectric Single Nozzle Droplet Generator for Production of Monodisperse Droplets of Variable Diameter. Chem. Eng. Technol. 24 (2001) 1, 69-70.
[4] H. Ulmke, K. Bauckhage, T. Wriedt: Piezoelektrischer Tropfengenerator zur Kalibrierung von Partikelzählern. Chemie Ingenieur Technik – CIT 71 (1999) 12, 1387 – 1391.
[5] H. Ulmke, T. Wriedt, K. Bauckhage: Piezoelectric Droplet Generator for the Calibration of Particle-Sizing Instruments. Chem. Eng. Technol. 24 (2001) 3, 265-268.

References to the Piezodropper

[1] J. Rheims, T. Wriedt, K. Bauckhage: Sizing of inhomogeneous particles by a differential laser Doppler anemometer. Meas. Sci. Technol. 10 (1999), 68–75.
[2] T. Wriedt, R. Schuh: The inclusion-concentration measurement of suspension droplets based on Monte Carlo ray tracing. Meas. Sci. Technol. 13 (2002) 3, 276-279.
[3] N. Riefler, R. Schuh: T. Wriedt: Investigation of a measurement technique to estimate concentration and size of inclusions in droplets. Meas. Sci. Technol. 18 (2007), 2209–2218.
[4] W. Weinberg, M. Mitschke, T. Wriedt, K. Bauckhage: PDA measurements of evaporating inhomogeneous droplets trapped in an acoustic levitator. Technisches Messen 67 (2000) 3, 104-110.
[5] J. Rheims, T. Wriedt, K. Bauckhage: Working principle and experimental results for a differential phase-Doppler technique. Part. Part. Systems Charact. 15 (1998) 5, 219-224.
[6] D. S. Golovko, T. Haschke, W. Wiechert, E. Bonaccurso: Nondestructive and noncontact method for determining the spring constant of rectangular cantilevers. Review of Scientific Instruments 78 (2007) 4, Art. No. 043705.
[7] H. J. Butt, D. S. Golovko, E. Bonaccurso: On the derivation of Young's equation for sessile drops: Nonequilibrium effects due to evaporation. Journal of Physical Chemistry B 111 (2007) 19, 5277-5283.
[8] E. Macis, M. Tedesco, P. Massobrio, R. Ralteri, S. Martinoia: An automated microdrop delivery system for neuronal network patterning on microelectrode arrays. Journal of Neuroscience Methods 161 (2007) 1, 88-95.
[9] C. Janzen, R. Fleige, R. Noll, H. Schwenke, W. Lahmann, J. Knoth, P. Beaven, E. Jantzen, A. Oest, P. Koke: Analysis of small droplets with a new detector for liquid chromatography based on laser-induced breakdown spectroscopy. Spectrochimica Acta / B, Atomic Spectroscopy 60 (2005) 7-8, 993-1001.
[10] S. Raja and K. T. Valsaraj: Adsorption and Transport of Gas-Phase Naphthalene on Micron-Size Fog Droplets in Air. Environ. Sci. Technol. 2004, 38, 763-768.
[11] S. Raja and K. T. Valsaraj: Heterogeneous oxidation by ozone of naphthalene adsorbed at the air-water interface of micron-size water droplets. Journal of the Air and Waste Management Association 55 (2005) 9, 1345-1355.
[12] S. M. Kontush, S. S. Rybak, A. Ya. Bekshaev, C. Esen, G. Schweiger: Obtaining the monodisperse droplets during the gas penetration through a thin liquid film. Review of Scientific Instruments, Volume 74 (2003) 7, 3554- 3558.
[13] Suresh Raja: Transport and kinetics of aromatic hydrocarbons into micron-sized liquid droplets: With applications to atmospheric chemistry. PhD Thesis, Louisiana State University, Agricultural and Mechanical College, Baton Rouge, LA, USA 2005.
[14] B. Baxter, T. Eng, J. Zechlinski, A. Zehm: Microencapsulation of Cells, BME 301, University of Wisconsin, Madison, USA, 2005.
[15] M. Garcìa - Pèrez, P. Lappas, P. Hughes, L. Dell, A. Chaala, D. Kretschmer and C. Roy: Evaporation and Combustion Characteristics of Biomass Vacuum Pyrolysis Oils. IFRF Combustion Journal, Article Number 200601, May 2006.
[16] Ghislain Rousseau, Yves Garant: Le professionnalisme dans l'utilisation de pesticides. Colloque Pesticides et Santé, Université de Montréal, Montréal, 19, 20 et 21 novembre 2003.
[17] Guangfen Li, Karlheinz Graf, Elmar Bonaccurso, Dmytro S. Golovko, Andreas Best, Hans-Jürgen Butt: Evaporation Structures of Solvent Drops Evaporating from Polymer Surfaces: Influence of Molar Mass. Macromol. Chem. Phys. 208 (2007), 2134–2144.
[18] Norbert Riefler, Thomas Wriedt: Generation of Monodisperse Micron-Sized Droplets using Free Adjustable Signals. Part. Part. Syst. Charact. 25 (2008), 176–182.
[19] J. Ni, W. Benecke and W. Lang: Thermodynamic analysis of a novel thermoelectric micro-droplet sensor. MEMS 2008 TUCSON, 21st IEEE International Conference on Micro Electro Mechanical Systems, January 13-17, 2008, Tucson, Arizona, USA.

[20] Dmytro S Golovko, Paolo Bonanno, Simone Lorenzoni,Fabrizio Stefani, Roberto Raiteri and Elmar Bonaccurso: Evaporative cooling of sessile water microdrops measured with atomic force microscope cantilevers. J. Micromech. Microeng. 18 (2008) 095026.

[21] Chuanjun Liu, Ying Liu, Mordechai Sokuler, Daniela Fell, Stephan Keller, Anja Boisen, Hans-Jürgen Butt, Günter K. Auernhammer and Elmar Bonaccurso: Diffusion of water into SU-8 microcantilevers. Phys. Chem. Chem. Phys. 12 (2010), 10577–10583.

[22] Chuanjun Liu and Elmar Bonaccurso: Microcantilever sensors for monitoring the evaporation of microdrops of pure liquids and mixtures. Rev. Sci. Instrum. 81 (2010) 013702.

[23] Chuanjun Liu, Marcus C. Lopes, Sascha A. Pihan, Daniela Fell, Mordechai Sokuler, Hans-Jürgen Butt, Günter K. Auernhammer, Elmar Bonaccurso: Water diffusion in polymer nano-films measured with microcantilevers, Sensors and Actuators B: Chemical 160 (2011) 1, 32-38.

[24] A. Shokuhi Rad: Case Study on Construction of Platinum Nanoparticle Stabilized with Decanethiol into Silica Substrate. Trends in Applied Sciences Research, 6 (2011), 204-207.

[25] Eslamian, M.; Ashgriz, N.: Drop-on-Demand Drop Generators. in Nasser Ashgriz (Editor): Handbook of Atomization and Spray, Theory and Applications. Springer, 2011, Part 3, 581-601.

Contact

Dr.-Ing. Thomas Wriedt

Tel.: ++49-421-218-51250
Fax: ++49-421-218-51211
email: thw@iwt.uni-bremen.de

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