Ultrasonic Applications0 pages
Hielscher Ultrasonics-Your Expert for Ultrasonic Processes
nnnnHielscher Ultrasonics is the top supplier for high
nnnnpower ultrasound devices. Hielscher offers various
nnnnultrasonic processors for the use in lab, bench-top
nnnnand industry. Important applications are
nnnnhomogenizing, emulsifying, dispersing, de-
nnnnagglomeration as well as the sonochemistry and
nnnnsono-cata lysis.
nnnnUltrasonic Homogenizing:
nnnnHielscher homogenizers are very efficient for the
nnnnreduction of soft and hard particles. By intense
nnnncavitational forces, ultrasound reduces small particles
nnnn(solids or liquids) in a liquid to improve uniformity
nnnnand stability.
nnnnUltrasonic Emulsifying:
nnnnEmulsions are dispersions of two or more immiscible
nnnnliquids. Highly intensive ultrasound supplies the
nnnnpower needed to disperse a liquid phase (dispersed
nnnnphase) in small droplets in a second phase
nnnn(continuous phase). In the dispersing zone, imploding
nnnncavitation bubbles cause intensive Shockwaves in the
nnnnsurrounding liquid and result in the formation of
nnnnliquid jets of high liquid velocity. As ultrasonication
nnnncan produce very small droplets of almost uniform
nnnnsize in batch and production process, ultrasound is an
nnnneffective methods to create stable emulsions and
nnnneven microemulsions.
nnnnUltrasonic Dispersing & Deagglomeration:
nnnnThe dispersing power of ultrasound is well-known
nnnnand a reliable and efficient method to mix powders
nnnninto liquids. High power ultrasound grinds and
nnnndeagglomerates particles held together by attraction
nnnnforces of physical and chemical nature down to
nnnnmicron and nano size and disperses the individual
nnnnparticles fine and evenly in the liquid. Generally,
nnnnultrasound produces very narrow particles size
nnnndistribution.
nnnnSono-Chemistry:
nnnnSonochemistry is the application of ultrasound to
nnnnchemical reactions and processes. The mechanism
nnnncausing sonochemical effects in liquids is the
nnnnphenomenon of acoustic cavitation.
nnnnHigh power ultrasound
nnnn• increases the reaction speed and reaction
nnnnoutput,
nnnnprovides a more efficient energy usage,
nnnn• improves the performance of phase
nnnntransfer catalysts or makes an avoidance of
nnnnphase transfer catalysts possible,
nnnn• increases the reactivity of reagents or
nnnncatalysts,
nnnn• offers sono-chemical means for switching
nnnnof the reaction pathway,
nnnn• enables to use crude or technical agents,
nnnn• and activates metals and solids.
nnnnSono-Cata lysis:
nnnnUltrasonication affects the catalyst reactivity
nnnnduring catalysis by enhanced mass-transfer
nnnnand energy input. In heterogeneous
nnnncatalysis, where the catalyst is in a different
nnnnphase to the reactants, ultrasonic dispersion
nnnnincreases the surface area available to the
nnnnreactants. Ultrasonication contributes to
nnnnheterogeneous and homogeneous catalysis
nnnnin many ways. Cavitational erosion on
nnnnparticle surfaces generates unpassivated,
nnnnhighly reactive surfaces. Short-lived high
nnnntemperatures and pressures contribute to
nnnnmolecular decomposition and increase the
nnnnreactivity of many chemical species.
nnnnUltrasonic irradiation can be used in the
nnnnpreparation of catalysts, e.g. to produce
nnnnaggregates of fine-size particles.
nnnnHielscher Ultrasonics GmbH
nnnnWarthestr. 21, 14513 Teltow, GERMANY
nnnnPhone:+49 (0)3328/ 437-3
nnnnFax: +49 (0)3328/437-444
nnnnWeb: www.hielscher.com
nnnnEmail: info(5)hielscher.com
nnnnhielscher ultrasonics
nnnnHielscher Ultrasonics GmbH www.hielscher.com; info@hielscher.com Tel.: +49 (0)3328/437-3 Fax: +49 (0)3328/437-444
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