Switchable Hydrophobic-Hydrophilic Surfaces

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Description

Tethered films of poly n-isopropylacrylamide (PNIPAM) films have been developed as materials that can be used to switch the chemistry of a surface in response to thermal activation. In water, PNIPAM exhibits a thermally-activated phase transition that is accompanied by significant changes in polymer volume, water contact angle, and protein adsorption characteristics. New synthesis routes have been developed to prepare PNIPAM films via in-situ polymerization on self-assembled monolayers. Swelling transitions in tethered films have been characterized using a wide range of techniques including surface plasmon resonance, attenuated total reflectance infrared spectroscopy, interfacial force microscopy, neutron reflectivity, and theoretical modeling. PNIPAM ... continued below

Physical Description

37 pages

Creation Information

BUNKER, BRUCE C.; HUBER, DALE L.; KENT, MICHAEL S.; YIM, HYUN; CURRO, JOHN G.; LOPEZ, GABRIEL P. et al. December 1, 2002.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Tethered films of poly n-isopropylacrylamide (PNIPAM) films have been developed as materials that can be used to switch the chemistry of a surface in response to thermal activation. In water, PNIPAM exhibits a thermally-activated phase transition that is accompanied by significant changes in polymer volume, water contact angle, and protein adsorption characteristics. New synthesis routes have been developed to prepare PNIPAM films via in-situ polymerization on self-assembled monolayers. Swelling transitions in tethered films have been characterized using a wide range of techniques including surface plasmon resonance, attenuated total reflectance infrared spectroscopy, interfacial force microscopy, neutron reflectivity, and theoretical modeling. PNIPAM films have been deployed in integrated microfluidic systems. Switchable PNIPAM films have been investigated for a range of fluidic applications including fluid pumping via surface energy switching and switchable protein traps for pre-concentrating and separating proteins on microfluidic chips.

Physical Description

37 pages

Source

  • Other Information: PBD: 1 Dec 2002

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  • Report No.: SAND2002-3870
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/806703 | External Link
  • Office of Scientific & Technical Information Report Number: 806703
  • Archival Resource Key: ark:/67531/metadc737125

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Creation Date

  • December 1, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

Description Last Updated

  • April 12, 2016, 12:54 p.m.

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BUNKER, BRUCE C.; HUBER, DALE L.; KENT, MICHAEL S.; YIM, HYUN; CURRO, JOHN G.; LOPEZ, GABRIEL P. et al. Switchable Hydrophobic-Hydrophilic Surfaces, report, December 1, 2002; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc737125/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.