Ultrasonic spray nozzles have long been recognized as an ideal tool

for micro-encapsulation. Their characteristic low-velocity spray, easily controllable drop size (drop

diameter is determined by nozzle frequency), and non- clogging design provide a perfect fit for many applications.

One method of using this unique technology for microencapsulation consists of spraying a liquid containing solids that immediately dry in

the air after atomization takes place, and fall gently into a liquid bath (Figure B below), creating encapsulated particles.

Another method uses Sono-Tek’s new dual liquid feed option (shown below) allowing for even greater flexibility in your process. With the appropriate chemistry, two liquids can be mixed right at the nozzle’s atomizing surface (see figure A to left).

• Ultrasonic atomization produces a tight and controllable drop size distribution

• Non-clogging ultrasonic nozzle is easy to clean, with low maintenance

• Capable of micro-quantity dispensing

• Produces low-velocity, spherical drops

• Dual liquid feed avoids premature mixing of components

Frequencies available from 25 - 120 kHz, depending on your drop size requirements.

Over 500 different ultrasonic nozzle configurations are available from Sono-Tek.To determine what system will best meet your needs, please feel free to speak with one of our sales engineers at 845-795-2020.

FIGURE A

FIGURE B Atomized solidparticles

Micro-encapsulatedparticles

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Micro encapsulation

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NCreating micro-encapsulatedparticles using Sono-Tekultrasonic nozzles

Corporate Headquarters:2012 Rte. 9W, Milton, NY 12547 USAPhone: 845•795•2020Fax: 845•795•2720

E-mail: info@sono-tek.comWeb: www.sono-tek.comPrinted in USA©2009 Sono-Tek Corporation. All rights reservedMICROENCAP05R3

Median Drop Size Comparison Chart*Nozzle Frequency Median Drop Size

35 kHz 49 m48 kHz 38 m60 kHz 31 m

120 kHz 18 m*Results based on water

Choice of drop size based on nozzle frequency

Ultrasonic vibrations provide uniform distribution of particles

in suspension.

Tight drop distribution

* Process development not supported

Applications include: *

• Targeted drug delivery• Slow release pharmaceuticals• Functional foods• Spices and flavorings• Aromas• Nanoencapsulation• Cosmetics• Pesticides• Pigments and dyes• Lubricants• Emulsions• High solids dispersions• Solgels• Catalysts

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