Long-term hydrophilization of polydimethylsiloxane (PDMS) for capillary filling microfluidic chips

Farzin Jahangiri*, Tuuli Hakala, Ville Jokinen

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

62 Lataukset (Pure)

Abstrakti

We present a simple and facile method for long-term preservation of hydrophilicity of oxygen plasma-hydrophilized poly (dimethylsiloxane) (PDMS) by cold storage. We show that storage under temperature of − 80 °C can maintain superhydrophilicity of plasma-exposed PDMS for at least 100 days. Storage at − 15 °C and at 22 °C room temperature (RT) is shown to exhibit, respectively, about half and full recovery of the original hydrophobicity after 100 days in storage. Furthermore, we investigated the implications of the cold storage for microfluidic applications, the capillary filling rate and the ability of the flow to bypass geometrical obstacles in a microfluidic channel. It is shown that the preservation of capillary filling properties of microchannels is in close agreement with the contact angle (CA) measurements and that the colder the storage temperature, the better the capillary filling capability of the channels is preserved. We ascribe the significantly reduced recovery rate to reduced thermally activated relaxation phenomena such as diminished diffusion of low molecular weight species (LMW) in the polymer matrix at colder temperatures. This is supported by ATR-FTIR measurements of the OH vibration band over time for samples stored at different temperatures.

AlkuperäiskieliEnglanti
Artikkeli2
JulkaisuMicrofluidics and Nanofluidics
Vuosikerta24
Numero1
DOI - pysyväislinkit
TilaJulkaistu - 1 tammikuuta 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Projektit

    Piisienet: mikrovalmistetut nesteitä hylkivät pinnat

    Franssila, S., Hoshian, S., Rontu, V., Jokinen, V., Rantataro, J., Mirmohammadi, S., Herrala, R. & Isoaho, N.

    01/09/201624/09/2020

    Projekti: Academy of Finland: Other research funding

    Mikropumput yksisolutekniikoiden ja lääketieteen avuksi

    Franssila, S., Rantataro, J., Ameziane, M. & Jokinen, V.

    01/01/201730/04/2019

    Projekti: Business Finland: Other research funding

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    Anna Rissanen (Manager)

    Aalto-yliopisto

    Laitteistot/tilat: Facility

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