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Investigation of aerosol droplets diameter generated in aerosol jet printing

100%

Łapa W. , Winnicki M. , Orłowska K.

tom Vol. 40, No. 4

78--90

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-1a 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.

Tekstroniczne czujniki temperatury

63%

Sibiński M. , Ciupa E.

2010

tom Vol. 51, nr 10

122-123

W artykule przedstawiono nową metodę wytwarzania grubowarstwowych czujników temperatury dla aplikacji tekstronicznych w ubiorach roboczych i ochronnych. Jako podłoże wykorzystane zostało włókno polimerowe, przeznaczone do bezpośredniej integracji ze strukturą tkaniny. Wykorzystanym materiałem aktywnym jest nowatorska pasta na bazie nanorurek węglowych. Zaprezentowano wyniki prac technologicznych oraz pomiary wykonanych sensorów w warunkach kalorymetrycznych.

In the paper new method of thck-layer technology for temperature sensor manufacturing, designed for textronic applications is presented. As the sensor base single polymer fiber, suitable for textile weaving was utilized. As the active sensor material new paste, based on carbon nanotubes was employed. Technological experiments and calorimethc parameters measurements of the final sensors are presented.