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Du M, Zhang Y, Song Y, Zheng Q. Negative velocity dependence of friction for poly(2-Acrylamido-2-methyl propanesulfonic acid) hydrogel sliding against a glass surface in the low-velocity region. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23480] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Miao Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Yan Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Yihu Song
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Qiang Zheng
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
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Wang Y, Tumarkin E, Velasco D, Abolhasani M, Lau W, Kumacheva E. Exploring a direct injection method for microfluidic generation of polymer microgels. LAB ON A CHIP 2013; 13:2547-2553. [PMID: 23407698 DOI: 10.1039/c3lc41385c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Microfluidics (MFs) offers a promising method for the preparation of polymer microgels with exquisite control over their dimensions, shapes and morphologies. A challenging task in this process is the generation of droplets (precursors for microgels) from highly viscous polymer solutions. Spatial separation of MF emulsification and gelation of the precursor droplets on chip can address this challenge. In the present work, we explored the application of the "direct injection" method for the preparation of microgels by adding a highly concentrated polymer solution or a gelling agent directly into the precursor droplets. In the first system, primary droplets were generated from a dilute aqueous solution of agarose, followed by the injection of the concentrated agarose solution directly in the primary droplets. The secondary droplets served as precursors for microgels. In the second system, primary droplets were generated from the low-viscous solution of methyl-β-cyclodextrin and poly(ethylene glycol) end-terminated with octadecyl hydrophobic groups. Addition of surfactant directly into the primary droplets led to the binding of methyl-β-cyclodextrin to the surfactant, thereby releasing hydrophobized poly(ethylene glycol) to form polymer microgels. Our results show that, when optimized, the direct injection method can be used for microgel preparation from highly viscous liquids and thus this method expands the range of polymers used for MF generation of microgels.
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Affiliation(s)
- Yihe Wang
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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Coles JM, Chang DP, Zauscher S. Molecular mechanisms of aqueous boundary lubrication by mucinous glycoproteins. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.07.002] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Chai L, Klein J. Shear Behavior of Adsorbed Poly(ethylene Oxide) Layers in Aqueous Media. Macromolecules 2008. [DOI: 10.1021/ma071352u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liraz Chai
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, OXI, 3QZ, U.K
| | - Jacob Klein
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel, and Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, OXI, 3QZ, U.K
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Du M, Maki Y, Tominaga T, Furukawa H, Gong JP, Osada Y, Zheng Q. Friction of Soft Gel in Dilute Polymer Solution. Macromolecules 2007. [DOI: 10.1021/ma0702187] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miao Du
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Yasuyuki Maki
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Taiki Tominaga
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Hidemitsu Furukawa
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Jian Ping Gong
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Yoshihito Osada
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
| | - Qiang Zheng
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; SORST, JST, Japan; and Department of Polymer Science and Engineering, Zhejiang University, P.R. China
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