<abstract xmlns="http://www.w3.org/1999/xhtml">

Aerosol jet printing is a contactless direct-write technique that could be used for the deposition of a variety of materials. First, used for electric paths, the technology was explored for many applications. The substantial part of the process is the generation of aerosols. The size of the droplets and the stability of the process affect the quality of the sprayed lines. This article investigates the diameter of the sprayed droplets, allowing future comparison of the results with sprayed lines. Droplets from ultrasonic and pneumatic generators were sprayed at their outlet on the polyethylene terephthalate (PET) foil. Using a digital microscope and the built-in algorithm, the diameter of the droplets was measured, and the dataset was collected as CSV files and served as a background to the box plot. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) scans were applied to verify the results obtained. The ink parameters used in the process have an influence on the aerosol generation and droplet diameter, whereas the carrier gas pressure has an impact mostly on the droplet diameter. In this case, the aerosol was produced from three types of ink in combination with two generators. For inks with a dynamic viscosity below 6.5 m·Pa−1·s−1 a stable range of 5–10 μm droplet diameter was observed. A high-viscosity ink (7.5–10.5 m·Pa−1·s−1) produced droplets with diameter in the range of 6–25 μm. The diameter of the droplet decreased from 7–22 μm to 1–5 μm with a reduction in the dynamic viscosity from 7.5–10.5 m·Pa−1·s−1 to 4.5–5.5 m·Pa−1·s−1.
</abstract>

Aerosol jet printing is a contactless direct-write technique that could be used for the deposition of a variety of materials. First, used for electric paths, the technology was explored for many applications. The substantial part of the process is the generation of aerosols. The size of the droplets and the stability of the process affect the quality of the sprayed lines. This article investigates the diameter of the sprayed droplets, allowing future comparison of the results with sprayed lines. Droplets from ultrasonic and pneumatic generators were sprayed at their outlet on the polyethylene terephthalate (PET) foil. Using a digital microscope and the built-in algorithm, the diameter of the droplets was measured, and the dataset was collected as CSV files and served as a background to the box plot. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) scans were applied to verify the results obtained. The ink parameters used in the process have an influence on the aerosol generation and droplet diameter, whereas the carrier gas pressure has an impact mostly on the droplet diameter. In this case, the aerosol was produced from three types of ink in combination with two generators. For inks with a dynamic viscosity below 6.5 m·Pa−1·s−1 a stable range of 5–10 μm droplet diameter was observed. A high-viscosity ink (7.5–10.5 m·Pa−1·s−1) produced droplets with diameter in the range of 6–25 μm. The diameter of the droplet decreased from 7–22 μm to 1–5 μm with a reduction in the dynamic viscosity from 7.5–10.5 m·Pa−1·s−1 to 4.5–5.5 m·Pa−1·s−1.

Investigation of aerosol droplets diameter generated in aerosol jet printing

Wrocław University of Science and Technology

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Investigation of aerosol droplets diameter generated in aerosol jet printing"}

Aerosol jet printing is a contactless direct-write technique that could be used for the deposition of a variety of materials. First, used for electric paths,...

Ink	Pressure (mbar)
(a)

6n	50	60	70	80	90	100	110	120	130	140	150
60n				80	90	100	110	120	130	140	150
600n						100	110	120	130	140	150

Ink	Dynamic viscosity [m·Pa·s]	Surface tension [dynes/cm]	Density [g/cm³]	Silver content [%]	Silver powder particles size range [nm]
600n	4.0–5.5	33	0.9–1.1	20	20–100
60n	5.0–6.5	35	0.8–1.0	20	20–100
6n	7.5–10.5	28.5–32.5	1.1–1.3	45	3–8

Investigation of aerosol droplets diameter generated in aerosol jet printing

Publicado en línea: 04 abr 2023

Páginas: 78 - 90

Recibido: 07 dic 2022

Aceptado: 20 feb 2023

DOI: https://doi.org/10.2478/msp-2022-0046

Palabras clave
aerosol jet printing, nano ink, aerosol generation, elastic electronics

© 2022 Wojciech Łapa et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Pressures used for the ultrasonic (a) and pneumatic (b) generator

Properties of the inks

Investigation of aerosol droplets diameter generated in aerosol jet printing

Publicado en línea: 04 abr 2023

Páginas: 78 - 90

Recibido: 07 dic 2022

Aceptado: 20 feb 2023

DOI: https://doi.org/10.2478/msp-2022-0046

Palabras claveaerosol jet printing, nano ink, aerosol generation, elastic electronics

© 2022 Wojciech Łapa et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Pressures used for the ultrasonic (a) and pneumatic (b) generator

Properties of the inks

Palabras clave
aerosol jet printing, nano ink, aerosol generation, elastic electronics