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LABORATORY
TECHNOLOGY
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Belgique |
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France |
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HIELSCHER: Sonificateur,
homogénéiseur à ultrasons, sonotrode
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Systèmes
Ultrason Innovants
Hielscher
Ultrasonics est le fournisseur mondial leader pour les
systèmes innovants à ultrason d’homogénéisateurs
de laboratoire aux réacteurs de procédés industriels.
Les applications typiques incluent mélange et homogénéisation,
désintégration et sono-chimie.
Les
systèmes ultrason fabriqués par Hielscher sont
utilisés pour l’homogénéisation des échantillons au
laboratoire ainsi que pour la sonification de
volumes importants en production industrielle.
Que vous ayez besoin de sonifier 1,5 ml dans un tube à
essai ou 20 tonnes par heure, Hielscher vous offre la
solution parfaite pour cela.
Applications
in the laboratory
Working
principle
En
savoir plus sur les applications de la sonification
The
selection
of the ultrasonic processor and sonotrodes
mainly complies with the volume of the samples to be
sonicated. The offered power range for the laboratory
includes devices of 50,
100, 200 and 400 watts
and is suitable for small droplets but also for several
liters. For bigger volumes we offer industrial
processors with a power range of up to 16kW per unit.
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UP50H,
from 0.01 to 250 ml, 50W |
UP100H,
from 0.01 to 500 ml, 100W |
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UP200H
and UP200S, from 0.1 to 1000 ml, 200W |
UP400S,
from 5 to 2000 ml, 400W |
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| HIELSCHER |
Applications
in the laboratory
In biology, molecular biology, biochemistry,
biotechnology and in the medical range ultrasound is
used for the disruption of cells for the isolation of
DNA, RNA or proteins and for the homogenizing of
samples. Muscle tissue, liver tissue or lymphocytes as
well as vegetable cells can be disrupted for analysis
purposes or for the use of their contents.
The
exact control of the amplitude allows for an isolation
of the cell nuclei, too. Sensitive materials can be
homogenized or disrupted gently.
The
sonotrodes can be treated in autoclaves and can be
cleaned easily due to their simple geometry, so that
contamination does not take place. For special
application cases we offer devices and accessories for
indirect sonication, so that the sample stays isolated.
The
separation of viruses from bacteria or the extraction of
active agents from vegetable cells are exemplary for the
practice in the pharmaceutical industry.
In
the food industry cheese, meat and sausage samples,
fruits, or vegetables are homogenized in order to test
the quality for consumer protection. In this branch of
industry ultrasound is also used for the production of
oil/water emulsions, in which very fine droplet sizes of
under 200nm can be achieved. The degassing of beverages
is useful for analysis. The reducing of germs in liquids
is already possible in low temperatures by the use of
ultrasound.
Environmental
standard tests are the homogenizing of water-, waste
water- and soil samples in order to detect or determine
oils, radio-active parts or the content of fertilizers.
In
the chemical industry ultrasound is used for the
production of suspensions, emulsions, for the
interference of crystallization or polymerization and
for the acceleration of chemical reactions or dissolving
processes.
deagglomerating
and sieving by means of ultrasound are applications,
that are in particular helpful, when manufacturing
coatings.
A
better permeation of pigments and an even distribution
can be reached with ultrasonic applications such as wet
coloring and impregnating.
Cleaning
is the most common ultrasonic application. The following
described laboratory devices can also be set in use for
special cleaning tasks, that demand a high ultrasonic
intensity on small surfaces e.g. bores can be cleaned by
ultrasound, when using thin-bodied sonotrodes. |
| Working
principle
The
operation of our ultrasonic processors is most simple.
The amplitude and therewith the power can be adjusted
from 20 to 100%. With an adjustable pulse from 0 up to 1
the operation can be stopped in defined regular
intervals, so that problems as regards the heating-up
and foaming can be avoided. The automatic determination
of the ideal frequency makes a manual precision
adjustment unnecessary. Independent of the sonotrode’s
load, the adjusted amplitude remains constant. That
creates reproducible conditions and also high robustness
as the devices are then steady-state proof even when
operated in air.
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| Sonotrodes
The
sonotrodes are the tools that transmit the ultrasound
into the liquid. The selection of the sonotrodes depends
on the sample volume and on the required ultrasound
intensity. Thin-bodied sonotrodes achieve very high
amplitudes up to 250µm, that result in very high
ultrasound power densities under the oscillating end
surface. A small but very intensive cavitation zone is
generated. The bigger the diameter, the higher is the
ultrasound power, that is transmitted via the
consequently bigger end face of the sonotrode. The
ultrasound power density i.e. the ratio between power
and oscillating surface becomes smaller. The cavitation
zone becomes larger but less intensive.
A
titanium alloy has proven to be the best sonotrode
material as it allows very high amplitudes and as it is
resistant to most liquids. Therefore this titanium alloy
is the standard material for our sonotrodes and the
ultrasonic processors are adjusted to it. For special
application cases we manufacture sonotrodes made of
stainless steel, glass or ceramics. The max. amplitudes
of the sonotrodes made of these materials are
significantly below those of the titanium sonotrodes.
The
lengths of the sonotrodes are determined by lambda/half.
If the ultrasonic processor has the frequency of 24kHz,
the titanium sonotrode has approx. the length 100mm but
can also be manufactured in manifold lengths. Sonotrodes
with O-rings or oscillating-free flanges are used for
the input of ultrasound in flow cells or in closed or
pressurized systems.
The
cavitation, that takes place at the sonotrode surface,
results in an abrasional effect. At the max. amplitude,
approx. 1mm of the sonotrode abrades within 1000 hours
of operation in water.The frequency scanning system of
our ultrasonic processors raises then automatically the
frequency, so that an abrasion of up to 5mm of the
sonotrode does not result in a considerable loss of
power.
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Selection
of the combination sonificator-sonotrode in
function of the sample volume ( ml ) to be
treated
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UP50H
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UP100H
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UP200H
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UP200S
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UP400S
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Sample
volume
( ml )
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Diamètre
de la sonotrode ( mm )
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0.01-0.50
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0.5
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0.5
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0.1-5.0
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1
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1
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1
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1
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2-50
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2
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2
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2
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2
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5-100
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3
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3
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3
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3
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3
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10-250
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7
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7
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7
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7
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7
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20-500
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10
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50-1000
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14
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14
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14
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10-2000
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22
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Téléchargez
le tarif 2009 HIELSCHER complet en pdf 
Téléchargez
la documentation HIELSCHER complète en pdf |
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IMLAB
bvba
Oude Vijvers 1
B - 3370 Boutersem
Belgique
info@imlab.be
www.imlab.be
Tél.: 016
- 73 55 72
Fax : 016 - 73 55 87
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IMLAB
sarl
Centre d'Affaires de l'Horlogerie
48 rue des Canonniers
F - 59000 Lille
France
imlab@wanadoo.fr
www.imlab.com
Tél.: 03 20 55 19 11
Fax : 03 20 55 20 85
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