Ultrasonic Applications0 pages

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Hielscher Ultrasonics-Your Expert for Ultrasonic Processes

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Hielscher Ultrasonics is the top supplier for high

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power ultrasound devices. Hielscher offers various

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ultrasonic processors for the use in lab, bench-top

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and industry. Important applications are

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homogenizing, emulsifying, dispersing, de-

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agglomeration as well as the sonochemistry and

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sono-cata lysis.

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Ultrasonic Homogenizing:

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Hielscher homogenizers are very efficient for the

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reduction of soft and hard particles. By intense

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cavitational forces, ultrasound reduces small particles

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(solids or liquids) in a liquid to improve uniformity

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and stability.

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Ultrasonic Emulsifying:

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Emulsions are dispersions of two or more immiscible

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liquids. Highly intensive ultrasound supplies the

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power needed to disperse a liquid phase (dispersed

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phase) in small droplets in a second phase

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(continuous phase). In the dispersing zone, imploding

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cavitation bubbles cause intensive Shockwaves in the

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surrounding liquid and result in the formation of

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liquid jets of high liquid velocity. As ultrasonication

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can produce very small droplets of almost uniform

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size in batch and production process, ultrasound is an

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effective methods to create stable emulsions and

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even microemulsions.

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Ultrasonic Dispersing & Deagglomeration:

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The dispersing power of ultrasound is well-known

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and a reliable and efficient method to mix powders

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into liquids. High power ultrasound grinds and

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deagglomerates particles held together by attraction

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forces of physical and chemical nature down to

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micron and nano size and disperses the individual

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particles fine and evenly in the liquid. Generally,

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ultrasound produces very narrow particles size

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distribution.

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Sono-Chemistry:

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Sonochemistry is the application of ultrasound to

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chemical reactions and processes. The mechanism

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causing sonochemical effects in liquids is the

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phenomenon of acoustic cavitation.

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High power ultrasound

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• increases the reaction speed and reaction

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output,

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provides a more efficient energy usage,

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• improves the performance of phase

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transfer catalysts or makes an avoidance of

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phase transfer catalysts possible,

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• increases the reactivity of reagents or

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catalysts,

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• offers sono-chemical means for switching

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of the reaction pathway,

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• enables to use crude or technical agents,

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• and activates metals and solids.

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Sono-Cata lysis:

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Ultrasonication affects the catalyst reactivity

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during catalysis by enhanced mass-transfer

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and energy input. In heterogeneous

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catalysis, where the catalyst is in a different

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phase to the reactants, ultrasonic dispersion

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increases the surface area available to the

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reactants. Ultrasonication contributes to

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heterogeneous and homogeneous catalysis

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in many ways. Cavitational erosion on

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particle surfaces generates unpassivated,

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highly reactive surfaces. Short-lived high

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temperatures and pressures contribute to

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molecular decomposition and increase the

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reactivity of many chemical species.

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Ultrasonic irradiation can be used in the

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preparation of catalysts, e.g. to produce

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aggregates of fine-size particles.

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Hielscher Ultrasonics GmbH

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Warthestr. 21, 14513 Teltow, GERMANY

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Phone:+49 (0)3328/ 437-3

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Fax: +49 (0)3328/437-444

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Web: www.hielscher.com

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Email: info(5)hielscher.com

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hielscher ultrasonics

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Hielscher Ultrasonics GmbH www.hielscher.com; info@hielscher.com Tel.: +49 (0)3328/437-3 Fax: +49 (0)3328/437-444

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