Title: Simple, Direct Routes to Polymer Brush Traps and Nanostructures for Studies of Diffusional Transport in Supported Lipid Bilayers

Abstract

Patterned poly(oligo ethylene glycol) methyl ether methacrylate (POEGMEMA) brush structures may be formed by using a combination of atom-transfer radical polymerization (ATRP) and UV photopatterning. UV photolysis is used to selectively dechlorinate films of 4-(chloromethyl)phenyltrichlorosilane (CMPTS) adsorbed on silica surfaces, by exposure either through a mask or using a two-beam interferometer. Exposure through a mask yields patterns of carboxylic acid-terminated adsorbates. POEGMEMA may be grown from intact Cl initiators that were masked during exposure. Corrals, traps, and other structures formed in this way enable the patterning of proteins, vesicles, and, following vesicle rupture, supported lipid bilayers (SLBs). Bilayers adsorbed on the carboxylic acid-terminated surfaces formed by C–Cl bond photolysis in CMPTS exhibit high mobility. SLBs do not form on POEGMEMA. Using traps consisting of carboxylic acid-functionalized regions enclosed by POEGMEMA structures, electrophoresis may be observed in lipid bilayers containing a small amount of a fluorescent dye. Segregation of dye at one end of the traps was measured by fluorescence microscopy. The increase in the fluorescence intensity was found to be proportional to the trap length, while the time taken to reach the maximum value was inversely proportional to the trap length, indicating uniform, rapid diffusion in all of the traps.more » Nanostructured materials were formed using interferometric lithography. Channels were defined by exposure of CMPTS films to maxima in the interferogram, and POEGMEMA walls were formed by ATRP. As for the micrometer-scale patterns, bilayers did not form on the POEGMEMA structures, and high lipid mobilities were measured in the polymer-free regions of the channels.« less

Authors:

Johnson, Alexander ^[1]; Bao, Peng ^[2]; Hurley, Claire R. ^[3]; Cartron, Michaël ^[4]; Evans, Stephen D. ^[2]; Hunter, C. Neil  ^[4];

• Search DOE PAGES for author "Hunter, C. Neil"
• Search DOE PAGES for ORCID "0000-0003-2533-9783"

Leggett, Graham J.  ^[1]

• Search DOE PAGES for author "Leggett, Graham J."
• Search DOE PAGES for ORCID "0000-0002-4315-9076"

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+ Show Author Affiliations

1. Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, United Kingdom, Krebs Institute, University of Sheffield, Sheffield S10 2TN, United Kingdom
2. Molecular and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
3. Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, United Kingdom
4. Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom

Publication Date:

Wed Apr 05 00:00:00 EDT 2017

Research Org.:

Univ. of Sheffield, Sheffield (United Kingdom); Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1361111

Alternate Identifier(s):

OSTI ID: 1508043

Grant/Contract Number:  

SC 0001035; SC0001035

Resource Type:

Published Article

Journal Name:

Langmuir

Additional Journal Information:

Journal Name: Langmuir Journal Volume: 33 Journal Issue: 15; Journal ID: ISSN 0743-7463

Publisher:

American Chemical Society

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY