Automated Drop-on-Fiber contact angle measurement using a microrobotic platform

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)

Interna författare/redaktörer

Publikationens författare: Pooya Saketi, Juha Hirvonen, Yuli Lai, Christian Ganser, Christian Teichert, Joakim Järnström, Pedro Fardim, Pasi Kallio
Publiceringsår: 2014
Tidskrift: Nordic Pulp and Paper Research Journal
Tidskriftsakronym: NORD PULP PAP RES J
Volym: 29
Nummer: 2
Artikelns första sida, sidnummer: 225
Artikelns sista sida, sidnummer: 231
Antal sidor: 7
ISSN: 0283-2631
eISSN: 2000-0669


Measuring contact angles on single fibers enables the separation of structural factors from surface chemistry factors. Current Drop-on-Fiber (DOF) contact angle measurement methods for natural fibers generally, and for pulp/paper fibers specifically, present a number of challenges. These are manipulation and mounting of the microscale fibers, straightening natural fibers to produce repeatable axisymmetric droplet conformation, measuring the droplet volume excluding the fiber volume and also human errors due to manually performed tasks. This paper presents a novel method to measure contact angles in DOF systems and overcome the above mentioned challenges using microrobots. The proposed microrobotic platform is capable of handling natural and synthetic fibrous materials in microscale, and dispensing probe liquid droplets down to 12 nl. It measures contact angle values using computer vision and a droplet-profile-detection algorithm. It reports the contact angle values as a function of volume of the droplet. The paper validates the capabilities of the proposed platform by applying three commonly used probe liquids: deionized water, ethylene glycol and diiodomethane for measuring contact angles on glass and pulp fibers. Finally, the results are compared with a picoliter contact angle measurement approach.


Contact Angle, Drop-on-Fiber, Micromanipulation, Microrobotics, Pulp/Paper Fiber

Senast uppdaterad 2020-04-08 vid 05:36