magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Matic Kovačič (Author), Joško Valentinčič (Mentor), Urban Tomc (Co-mentor)

Abstract

V magistrski nalogi je predstavljena zasnova, izdelava in analiza delovanja digitalne mikrofluidne naprave za manipulacijo kapljic na podlagi elektro-omočljivosti, ki ima kontaktne linije zasnovane z enoplastno arhitekturo. Poudarek je na eksperimentalnem delu, kjer so bili izvedeni poskusi avtomatiziranega premikanja kapljic s pomočjo algoritma. Na začetku so opisane teoretične osnove, potrebne za razumevanje pojava elektro-omočljivosti in aplikacije tehnologije elektro-omočenja na dielektriku. V eksperimentalnem delu je opisana zasnova in izdelava elektrod z lasersko fotolitografijo ter priprava površine, kjer smo dielektrično in hidrofobno plast nanesli s tehniko nanašanja z vrtenjem. Izvedene so bile meritve statičnih kotov omočenja in premiki kapljic, na podlagi tega pa so nadalje predstavljeni tudi rezultati. Potrdili smo delovanje zastavljenega koncepta z delujočimi sredinskimi elektrodami. Izdelana naprava ima mejno napetost nasičenja 230 V, omogoča velike kontaktne kote kapljice nad 120° in omogoča spremembo kota v vrednosti 24,5°. Na dielektriku debeline 15 µm smo pri 140 V dosegli hitrost premika 68 mm/s. Naloga vsebuje tudi predloge za nadaljnje delo in predlagane izboljšave postopka izdelave oziroma koncepta.

Keywords

magistrske naloge;površinska napetost;elektro-omočljivost;manipulacija kapljice;elektroda;litografija;kot omočljivosti;prenos toplote;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [M. Kovačič]
UDC: 621.3:532.5:544.722.3(043.2)
COBISS: 227219715 Link will open in a new window
Views: 40
Downloads: 10
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Other data

Secondary language: English
Secondary title: Fabrication process and performance analysis of a digital microfluidics system
Secondary abstract: The master’s thesis presents the design, fabrication, and analysis of a digital microfluidic device for droplet manipulation based on electrowetting, featuring single-layer electrode architecture with contact lines. The focus is on the experimental work, which includes automated droplet movement experiments conducted using an algorithm. The theoretical foundations required to understand the phenomenon of electrowetting and the applications of electrowetting-on-dielectric (EWOD) technology are described at the beginning. The experimental section details the design and fabrication of electrodes using laser photolithography and the surface preparation process, where dielectric and hydrophobic layers were applied using spin-coating techniques. Measurements of static contact angles and droplet movements were performed, with the results presented subsequently. The functionality of the proposed concept with operational central electrodes was confirmed. The fabricated device exhibits a saturation voltage threshold of 230 V, enables high droplet contact angles above 120°, and allows for a contact angle variation of 24.5°. On a 15 µm dielectric layer, a droplet speed of approximately 68 mm/s was achieved at 140 V. The thesis also includes proposals for further work and suggested improvements to the manifacturing process or conceptual design.
Secondary keywords: master thesis;surface tension;electrowetting;droplet manipulation;electrode;lithography;contact angle;heat transfer;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXIV, 80 str.
ID: 25955943
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