Contact
Dr.-Ing. Thomas Wriedt
Universtität Bremen, FB4
Verfahrenstechnik
P.O. Box 330440
D-28334 Bremen
Germany
Tel.: ++49-421-218-2507
Fax: ++49-421-218-5378
email: thw@iwt.uni-bremen.de
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
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.
Contact
Dr.-Ing. Thomas Wriedt
Universtität
Bremen, FB4
Verfahrenstechnik
P.O. Box
330440
D-28334 Bremen
Germany
Tel.: ++49-421-218-2507
Fax: ++49-421-218-5378
email: thw@iwt.uni-bremen.de