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Manipulate fluid in microchannels with thermo-responsive film [An article from: Analytica Chimica Acta]
Book Details
Author(s)T. Saitoh, A. Sekino, M. Hiraide
PublisherElsevier
ISBN / ASINB000RR3HXS
ISBN-13978B000RR3HX3
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The improvement of thermo-responsive wettability change on the glass surfaces poly(N-isopropylacrylamide) [PNIPAAm]-modified was investigated by the cooperative modification with hydrophobic octadecylsilane (ODS) or by the polymer modification on frosted surfaces. The water contact angle of PNIPAAm-modified glass surface was ca. 32^o below the lower critical solution temperature (LCST, ca. 32^oC) of PNIPAAm, while it was ca. 68^o above LCST. In PNIPAAm-ODS system, the water contact angle above LCST increased to ca. 84^o, but was still lower than 90^o being the measure of water-repellency. On the other hand, higher wettability (water contact angle; ca. 24^o) below LCST and water-repellency (water contact angle; ca. 104^o) above LCST were obtained on the PINIPAAm-modifed frosted glass surfaces. When an optional portion beside the channel on a glass plate was warmed, the capillarity-based liquid flow in the channel was temporary stemmed at the prescribed portion. Furthermore, the flow switching at a T-junction in the channel was successfully achieved, when the opposite side of the channel that stream had to be directed was warmed.
Description:
The improvement of thermo-responsive wettability change on the glass surfaces poly(N-isopropylacrylamide) [PNIPAAm]-modified was investigated by the cooperative modification with hydrophobic octadecylsilane (ODS) or by the polymer modification on frosted surfaces. The water contact angle of PNIPAAm-modified glass surface was ca. 32^o below the lower critical solution temperature (LCST, ca. 32^oC) of PNIPAAm, while it was ca. 68^o above LCST. In PNIPAAm-ODS system, the water contact angle above LCST increased to ca. 84^o, but was still lower than 90^o being the measure of water-repellency. On the other hand, higher wettability (water contact angle; ca. 24^o) below LCST and water-repellency (water contact angle; ca. 104^o) above LCST were obtained on the PINIPAAm-modifed frosted glass surfaces. When an optional portion beside the channel on a glass plate was warmed, the capillarity-based liquid flow in the channel was temporary stemmed at the prescribed portion. Furthermore, the flow switching at a T-junction in the channel was successfully achieved, when the opposite side of the channel that stream had to be directed was warmed.
