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Dynamic contact angles and contact angle hysteresis of plasma polymers
YKI – Ytkemiska institutet.
1994 (Engelska)Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 10, s. 3887-3897Artikel i tidskrift (Refereegranskat)
Abstract [en]

Dynamic advancing and receding contact angles and the contact angle hysteresis for different plasma polymers deposited on microscope cover glasses were investigated by the Wilhelmy plate method. The hysteresis loops observed by this dynamic method show two major factors: (1) the meniscus change at the transition region; (2) the wettability change of solid surfaces. The first factor is due to the fact that three-phase contact line does not move in the transition region while the water level is forced to rise up or lower down. The second factor is due to the change of surface state of the solid. Moreover, this factor can be related to the Fstep change» at the buoyancy slope of a hysteresis loop when the wetting line is moved from a "prewetted» area to a adry" area of the same sample and also to the gap between the first and second immersion loops. Both factors are caused by the interaction forces between solid surface and water molecules at the solid/liquid interface . Plasma polymer of the tetrafluoroethylene (TFE) showed the largest hysteresis loop primarily due to the significant change of surface state after water immersion. Plasma polymer of hexamethyldisiloxane (HMDSO) showed the smallest hysteresis loop due to the minimal change in the surface state after water immersion. Water contact angles of plasma polymers were clearly dependent on plasma conditions manifested by the discharge energy density.

Ort, förlag, år, upplaga, sidor
1994. Vol. 10, s. 3887-3897
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Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-27283OAI: oai:DiVA.org:ri-27283DiVA, id: diva2:1054287
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A967Tillgänglig från: 2016-12-08 Skapad: 2016-12-08 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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