Continuous operation of SAW atomiser

Soluch, W.; Wróbel, T.

doi:10.1049/el:20030306

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…As a further development of the capillary slit fluid supply (Kurosawa et al, 1995a ; Kurosawa et al, 1995b ; Soluch & Wrobel, 2003 ; Soluch & Wrobel, 2006 ), a fluid supply via SU-8 microchannels placed at the boundary of the acoustic propagation path (region 2) has recently been demonstrated (Winkler et al, 2015 ). Due to the use of photolithography for the channel structuring, the position of the fluid meniscus as well as its height and width can be tailored with sub-micron resolution, well below the SAW wavelength.…”

Section: Resultsmentioning

confidence: 99%

Compact SAW aerosol generator

Winkler

Harazim

Collins

et al. 2017

Biomed Microdevices

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In this work, we discuss and demonstrate the principle features of surface acoustic wave (SAW) aerosol generation, based on the properties of the fluid supply, the acoustic wave field and the acoustowetting phenomena. Furthermore, we demonstrate a compact SAW-based aerosol generator amenable to mass production fabricated using simple techniques including photolithography, computerized numerical control (CNC) milling and printed circuit board (PCB) manufacturing. Using this device, we present comprehensive experimental results exploring the complexity of the acoustic atomization process and the influence of fluid supply position and geometry, SAW power and fluid flow rate on the device functionality. These factors in turn influence the droplet size distribution, measured here, that is important for applications including liquid chromatography, pulmonary therapies, thin film deposition and olfactory displays.Electronic supplementary materialThe online version of this article (doi:10.1007/s10544-017-0152-9) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Compact SAW aerosol generator

Winkler

Harazim

Collins

et al. 2017

Biomed Microdevices

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“…(3) A thirdand rarely usedapproach introduced by Kurosawa et al 1,2 and Soluch et al 25,38 is based on capillary slits of 10 to 50 μm height and several mm width, formed between the piezoelectric substrate and a glass cover slip. Compared to approaches 1 and 2, the continuous fluid supply via capillary slits has one mentionable advantage: it supplies the fluid to the SAW beam in the form of a thin film, i.e.…”

Section: Introductionmentioning

confidence: 99%

SAW-based fluid atomization using mass-producible chip devices

et al. 2015

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Surface acoustic wave (SAW)-based fluid atomizers are ideally suited to generate micrometer-sized droplets without any moving parts or nozzles. Versatile application fields can be found for instance in biomedical, aerosol or thin film technology, including medical inhalators or particle deposition for advanced surface treatment. Such atomizers also show great potential for on-chip integration and can lead to economic production of hand-held and even disposable devices, with either a single functionality or integrated in more complex superior systems. However, this potential was limited in the past by fluid supply mechanisms inadequate for mass production, accuracy and reliability. In this work, we briefly discuss existing fluid supply methods and demonstrate a straightforward new approach suited for reliable and cost-effective mass-scale manufacturing of SAW atomizer chips. Our approach is based on a fluid supply at the boundary of the acoustic beam via SU-8 microchannels produced by a novel one-layer/double-exposure photolithography method. Using this technique, we demonstrate precise and stable fluid atomization with almost ideal aerosol plume geometry from a dynamically stabilized thin fluid film. Additionally, we demonstrate the possibility of in situ altering the droplet size distribution by controlling the amount of fluid available in the active region of the chip.

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Production of Additive‐Free Amorphous Nanoparticles with a SAW‐Based Microfluidic Spray‐Dryer

Steinacher

Gilbert

et al. 2019

Adv Materials Technologies

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Spray‐drying is a widely employed, cost‐effective process to formulate solutions into solid particles of controlled sizes and compositions. In addition, this process can also offer control over the structure of spray‐dried particles: if the solvent is evaporated sufficiently quickly, crystallization of solutes can be kinetically suppressed, resulting in amorphous particles. To achieve the required fast drying of drops and to offer high flexibility in the solvent and solute choice, a surface acoustic wave (SAW)‐based spray‐dryer is introduced that produces drops with diameters of only a few micrometers. These small drops are dried in a dedicated drying unit at room temperature, thereby enabling the fabrication of additive‐free amorphous particles. This device offers an additional advantage: because the formation of drops is decoupled from their drying, chemical reactions can be initiated in drying drops using reactive gases without compromising the robustness of the device operation. This feature is demonstrated on aqueous drops encompassing Ca(OH)2 that are converted into amorphous CaCO3 particles using CO2‐enriched drying air. Because the solvent is evaporated at room temperature, this device offers new possibilities to process heat sensitive samples into powders with well‐defined compositions and unusual structures.

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Continuous operation of SAW atomiser

Cited by 7 publications

References 3 publications

Compact SAW aerosol generator

Compact SAW aerosol generator

SAW-based fluid atomization using mass-producible chip devices

Production of Additive‐Free Amorphous Nanoparticles with a SAW‐Based Microfluidic Spray‐Dryer

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