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Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

Zhou, Yuchen and Huang, Junjie and Sun, Wei and Ju, Yuanlai and Yang, Pinghui and Ding, Lingyun and Chen, Zhongren and Kornfield, Julia A. (2017) Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating. ACS Applied Materials & Interfaces, 9 (4). pp. 4177-4183. ISSN 1944-8244. doi:10.1021/acsami.6b13525.

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Patterned porous surfaces with responsive functionalities are fabricated by a thermo-responsive microgel-assisted breath figure (BF) process. When water droplets submerge into a polystyrene (PS) solution during formation of a porous surface by the bottom-up BF process, poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AA) microgels dispersed in the solution spontaneously assemble at the water-organic interfaces like “Pickering emulsions”, reinforced by capillary flow. The conformal layer of PNIPAm-co-AA microgels lining the pores appears in images of scanning electron microscope (SEM) either as a smooth surface layer (L) or as an array of dome-like protrusions (D), depending on the conditions at which the sample was dried for SEM. The change between L and D morphology correlates with the volume phase transition behavior of the microgels freely suspended: drying at a temperature below the Volume Phase Transition Temperature (VPTT) gives L, and the D morphology is formed by drying at a temperature greater than the VPTT of PNIPAm-co-AA microgels. The morphological transition is shown to accompany a significant change in surface contact angle (CA) relative to a corresponding pore layer made of PS, with L having a CA that is reduced by 85° relative to PS, while the decrease is only 22° for D. Porous structures with morphologically responsive surfaces could find application in biocatalysis or tissue engineering, for example, with functional enzymes sequestered when microgels are collaped and accessible when the microgels are swollen.

Item Type:Article
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URLURL TypeDescription Information
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2017 American Chemical Society. Received: October 24, 2016; Accepted: January 9, 2017; Published: January 9, 2017. Financial support from the National Natural Science Foundation of China (No. 21104036), Program for Zhejiang Leading S&T Innovation Team (No. 2011R50001-07), the Natural Science Foundation of Ningbo (No. 2015A610057), Scientific Research Funding of Ningbo University (No. xkl11050, No. xyl14014) and K. C. Wong Magna Fund in Ningbo University is gratefully acknowledged.
Funding AgencyGrant Number
National Natural Science Foundation of China21104036
Program for Zhejiang Leading S&T Innovation Team2011R50001-07
Natural Science Foundation of Ningbo2015A610057
Ningbo Universityxkl11050
Ningbo Universityxyl14014
Subject Keywords:breath figure method; interfacial assembly of microgels; morphological transitions; responsive patterned polymer surfaces; wettability variations
Issue or Number:4
Record Number:CaltechAUTHORS:20170110-094112417
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Official Citation:Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating Yuchen Zhou, Junjie Huang, Wei Sun, Yuanlai Ju, Pinghui Yang, Lingyun Ding, Zhong-Ren Chen, and Julia A. Kornfield ACS Applied Materials & Interfaces 2017 9 (4), 4177-4183 DOI: 10.1021/acsami.6b13525
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73362
Deposited By: Tony Diaz
Deposited On:10 Jan 2017 19:05
Last Modified:11 Nov 2021 05:15

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