751
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Lange F, Schwenke K, Kurakazu M, Akagi Y, Chung UI, Lang M, Sommer JU, Sakai T, Saalwächter K. Connectivity and Structural Defects in Model Hydrogels: A Combined Proton NMR and Monte Carlo Simulation Study. Macromolecules 2011. [DOI: 10.1021/ma201847v] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frank Lange
- Institut für Physik − NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany
| | - Konrad Schwenke
- Leibniz-Institut für Polymerforschung Dresden, Hohe Strasse 6, 01069 Dresden, Germany
| | - Manami Kurakazu
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yuki Akagi
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Michael Lang
- Leibniz-Institut für Polymerforschung Dresden, Hohe Strasse 6, 01069 Dresden, Germany
| | - Jens-Uwe Sommer
- Leibniz-Institut für Polymerforschung Dresden, Hohe Strasse 6, 01069 Dresden, Germany
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kay Saalwächter
- Institut für Physik − NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany
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752
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Affiliation(s)
- K. Schwenke
- Leibniz Institute für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany
| | - M. Lang
- Leibniz Institute für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany
| | - J.-U. Sommer
- Leibniz Institute für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany
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753
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Haque MA, Kurokawa T, Kamita G, Gong JP. Lamellar Bilayers as Reversible Sacrificial Bonds To Toughen Hydrogel: Hysteresis, Self-Recovery, Fatigue Resistance, and Crack Blunting. Macromolecules 2011. [DOI: 10.1021/ma201653t] [Citation(s) in RCA: 289] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- M. Anamul Haque
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Takayuki Kurokawa
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan
- Creative Research Institution, Hokkaido University, Sapporo 001-0021, Japan
| | - Gen Kamita
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - J. Ping Gong
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan
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754
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Hu X, Xiong L, Wang T, Zhu M, Liu X, Tong Z. Ultrahigh Tensibility and Stimuli-Response of Polymer-Hectorite Nanocomposite Hydrogels. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.201000131] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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755
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Hu J, Hiwatashi K, Kurokawa T, Liang SM, Wu ZL, Gong JP. Microgel-Reinforced Hydrogel Films with High Mechanical Strength and Their Visible Mesoscale Fracture Structure. Macromolecules 2011. [DOI: 10.1021/ma2016248] [Citation(s) in RCA: 218] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian Hu
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Kenta Hiwatashi
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Takayuki Kurokawa
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan
- Creative Research Initiative Sousei, Hokkaido University, Sapporo 001-0021, Japan
| | - Song Miao Liang
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Zi Liang Wu
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Jian Ping Gong
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan
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756
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Nomoto Y, Matsunaga T, Sakai T, Tosaka M, Shibayama M. Structure and physical properties of dried Tetra-PEG gel. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.06.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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757
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Nakajima T, Furukawa H, Tanaka Y, Kurokawa T, Gong JP. Effect of void structure on the toughness of double network hydrogels. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/polb.22293] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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758
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Akagi Y, Katashima T, Katsumoto Y, Fujii K, Matsunaga T, Chung UI, Shibayama M, Sakai T. Examination of the Theories of Rubber Elasticity Using an Ideal Polymer Network. Macromolecules 2011. [DOI: 10.1021/ma201088r] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuki Akagi
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takuya Katashima
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yukiteru Katsumoto
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Kenta Fujii
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takuro Matsunaga
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Mitsuhiro Shibayama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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759
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Numata K, Katashima T, Sakai T. State of Water, Molecular Structure, and Cytotoxicity of Silk Hydrogels. Biomacromolecules 2011; 12:2137-44. [DOI: 10.1021/bm200221u] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Keiji Numata
- Enzyme Research Team, RIKEN Biomass Engineering Program, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Takuya Katashima
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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760
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Li X, Tsutsui Y, Matsunaga T, Shibayama M, Chung UI, Sakai T. Precise Control and Prediction of Hydrogel Degradation Behavior. Macromolecules 2011. [DOI: 10.1021/ma2004234] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiang Li
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yusuke Tsutsui
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takuro Matsunaga
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Mitsuhiro Shibayama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Ung-il Chung
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takamasa Sakai
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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761
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Matsunaga T, Asai H, Akagi Y, Sakai T, Chung UI, Shibayama M. SANS Studies on Tetra-PEG Gel under Uniaxial Deformation. Macromolecules 2011. [DOI: 10.1021/ma102658e] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuro Matsunaga
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Hanako Asai
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Yuki Akagi
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Mitsuhiro Shibayama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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762
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Haraguchi K. Synthesis and properties of soft nanocomposite materials with novel organic/inorganic network structures. Polym J 2011. [DOI: 10.1038/pj.2010.141] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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763
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Amamoto Y, Kikuchi M, Masunaga H, Ogawa H, Sasaki S, Otsuka H, Takahara A. Mesh-size control and functionalization of reorganizable chemical gels by monomer insertion into their cross-linking points. Polym Chem 2011. [DOI: 10.1039/c0py00304b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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764
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Naficy S, Brown HR, Razal JM, Spinks GM, Whitten PG. Progress Toward Robust Polymer Hydrogels. Aust J Chem 2011. [DOI: 10.1071/ch11156] [Citation(s) in RCA: 237] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In this review we highlight new developments in tough hydrogel materials in terms of their enhanced mechanical performance and their corresponding toughening mechanisms. These mechanically robust hydrogels have been developed over the past 10 years with many now showing mechanical properties comparable with those of natural tissues. By first reviewing the brittleness of conventional synthetic hydrogels, we introduce each new class of tough hydrogel: homogeneous gels, slip-link gels, double-network gels, nanocomposite gels and gels formed using poly-functional crosslinkers. In each case we provide a description of the fracture process that may be occurring. With the exception of double network gels where the enhanced toughness is quite well understood, these descriptions remain to be confirmed. We also introduce material property charts for conventional and tough synthetic hydrogels to illustrate the wide range of mechanical and swelling properties exhibited by these materials and to highlight links between these properties and the network topology. Finally, we provide some suggestions for further work particularly with regard to some unanswered questions and possible avenues for further enhancement of gel toughness.
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765
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Saito J, Furukawa H, Kurokawa T, Kuwabara R, Kuroda S, Hu J, Tanaka Y, Gong JP, Kitamura N, Yasuda K. Robust bonding and one-step facile synthesis of tough hydrogels with desirable shape by virtue of the double network structure. Polym Chem 2011. [DOI: 10.1039/c0py00272k] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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766
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Shibayama M. Small-angle neutron scattering on polymer gels: phase behavior, inhomogeneities and deformation mechanisms. Polym J 2010. [DOI: 10.1038/pj.2010.110] [Citation(s) in RCA: 160] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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767
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Haraguchi K, Li HJ, Ren HY, Zhu M. Modification of Nancomposite Gels by Irreversible Rearrangement of Polymer/Clay Network Structure through Drying. Macromolecules 2010. [DOI: 10.1021/ma102118b] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazutoshi Haraguchi
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
| | - Huan-jun Li
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
- School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China
| | - Huai-yin Ren
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
- College of Materials Science and Engineering, Donghua University, Shanghai 200051, China
| | - Meifang Zhu
- College of Materials Science and Engineering, Donghua University, Shanghai 200051, China
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768
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Recent advances in hydrogels in terms of fast stimuli responsiveness and superior mechanical performance. Polym J 2010. [DOI: 10.1038/pj.2010.87] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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769
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Sakai T, Akagi Y, Matsunaga T, Kurakazu M, Chung UI, Shibayama M. Highly Elastic and Deformable Hydrogel Formed from Tetra-arm Polymers. Macromol Rapid Commun 2010; 31:1954-9. [DOI: 10.1002/marc.201000286] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 07/05/2010] [Indexed: 11/06/2022]
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770
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Yoshida R. Self-oscillating gels driven by the Belousov-Zhabotinsky reaction as novel smart materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:3463-83. [PMID: 20503208 DOI: 10.1002/adma.200904075] [Citation(s) in RCA: 240] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
So far stimuli-responsive polymer gels and their application to smart materials have been widely studied; this research has contributed to progress in gel science and engineering. For their development as a novel biomimetic polymer, studies of polymers with an autonomous self-oscillating function have been carried out since the first reports in 1996. The development of novel self-oscillating polymers and gels have been successful utilizing the oscillating reaction, called the Belousov-Zhabotinsky (BZ) reaction, which is recognized as a chemical model for understanding several autonomous phenomena in biological systems. The self-oscillating polymer is composed of a poly(N-isopropylacrylamide) network in which the catalyst for the BZ reaction is covalently immobilized. In the presence of the reactants, the polymer undergoes spontaneous cyclic soluble-insoluble changes or swelling-deswelling changes (in the case of gel) without any on-off switching of external stimuli. Potential applications of the self-socillating polymers and gels include several kinds of functional material systems, such as biomimetic actuators and mass transport surface.
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Affiliation(s)
- Ryo Yoshida
- Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Japan.
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771
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Waters DJ, Engberg K, Parke-Houben R, Hartmann L, Ta CN, Toney MF, Frank CW. Morphology of Photopolymerized End-linked Poly(ethylene glycol) Hydrogels by Small Angle X-ray Scattering. Macromolecules 2010; 43:6861-6870. [PMID: 21403767 DOI: 10.1021/ma101070s] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Due to the biocompatibility of poly(ethylene glycol) (PEG), PEG-based hydrogels have attracted considerable interest for use as biomaterials in tissue engineering applications. In this work, we show that PEG-based hydrogels prepared by photopolymerization of PEG macromonomers functionalized with either acrylate or acrylamide end-groups generate networks with crosslink junctions of high functionality. Although the crosslink functionality is not well controlled, the resultant networks are sufficiently well ordered to generate a distinct correlation peak in the small angle x-ray scattering (SAXS) related to the distance between crosslink junctions within the PEG network. The crosslink spacing is a useful probe of the PEG chain conformation within the hydrogel and ranges from approximately 6 to 16 nm, dependent upon both the volume fraction of polymer and the molecular weight of the PEG macromonomers. The presence of a peak in the scattering of photopolymerized PEG networks is also correlated with an enhanced compressive modulus in comparison to PEG networks reported in the literature with much lower crosslink functionality that exhibit no scattering peak. This comparison demonstrates that the method used to link together PEG macromonomers has a critical impact on both the nanoscale structure and the macroscopic properties of the resultant hydrogel network.
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Affiliation(s)
- Dale J Waters
- Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stauffer III, Stanford, CA 94305-5025, United States
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772
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Dušková-Smrčková M, Valentová H, Ďuračková A, Dušek K. Effect of Dilution on Structure and Properties of Polyurethane Networks. Pregel and Postgel Cyclization and Phase Separation. Macromolecules 2010. [DOI: 10.1021/ma100626d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Helena Valentová
- Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | - Andrea Ďuračková
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic Prague, Czech Republic
| | - Karel Dušek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic Prague, Czech Republic
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773
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Characterization of spatial inhomogeneities and dynamic properties of random cross-linked polystyrene networks by dynamic light scattering. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.04.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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774
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Fukasawa M, Sakai T, Chung UI, Haraguchi K. Synthesis and Mechanical Properties of a Nanocomposite Gel Consisting of a Tetra-PEG/Clay Network. Macromolecules 2010. [DOI: 10.1021/ma100419c] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mieko Fukasawa
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazutoshi Haraguchi
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
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775
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Hu X, Wang T, Xiong L, Wang C, Liu X, Tong Z. Preferential adsorption of poly(ethylene glycol) on hectorite clay and effects on poly(N-isopropylacrylamide)/hectorite nanocomposite hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4233-4238. [PMID: 19994842 DOI: 10.1021/la903298n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Poly(N-isopropylacrylamide)/Laponite nanocomposite hydrogel (NC gel) was synthesized via in situ polymerization in the Laponite suspension containing PEG. The adsorption of PEG on Laponite platelets was characterized by zeta-potential, which decreased with the PEG adsorption. The tensile strength decreased and elongation at break increased with increasing PEG concentration. The effective network chain density of PNIPAm/Laponite NC gels determined from the equilibrium modulus G(e) decreased upon adsorption of PEG on the Laponite. All of these results revealed the preferential adsorption of PEG on the Laponite platelets occupying the active sites for the PNIPAm chain anchoring, which hindered their cross-linking effect in the NC gels. However, the temperature sensitive swelling behavior still remained in the PNIPAm/Laponite NC gels containing PEG with higher swelling volume below the LCST due to the lower cross-linker density. By adjusting the amount of added PEG, we can easily control the properties of the PNIPAm/Laponite NC gels.
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Affiliation(s)
- Xiaobo Hu
- Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
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776
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Kurakazu M, Katashima T, Chijiishi M, Nishi K, Akagi Y, Matsunaga T, Shibayama M, Chung UI, Sakai T. Evaluation of Gelation Kinetics of Tetra-PEG Gel. Macromolecules 2010. [DOI: 10.1021/ma100176f] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manami Kurakazu
- Department of Bioengineering, Graduate School of Engineering
| | | | | | - Kengo Nishi
- Department of Bioengineering, Graduate School of Engineering
| | - Yuki Akagi
- Department of Bioengineering, Graduate School of Engineering
| | - Takuro Matsunaga
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581, Japan
| | - Mitsuhiro Shibayama
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581, Japan
| | - Ung-il Chung
- Department of Bioengineering, Graduate School of Engineering
| | - Takamasa Sakai
- Department of Bioengineering, Graduate School of Engineering
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777
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778
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Nakajima T, Takedomi N, Kurokawa T, Furukawa H, Gong JP. A facile method for synthesizing free-shaped and tough double network hydrogels using physically crosslinked poly(vinyl alcohol) as an internal mold. Polym Chem 2010. [DOI: 10.1039/c0py00031k] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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779
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Siegel RA, Gu Y, Lei M, Baldi A, Nuxoll EE, Ziaie B. Hard and soft micro- and nanofabrication: An integrated approach to hydrogel-based biosensing and drug delivery. J Control Release 2009; 141:303-13. [PMID: 20036310 DOI: 10.1016/j.jconrel.2009.12.012] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Accepted: 12/09/2009] [Indexed: 11/16/2022]
Abstract
We review efforts to produce microfabricated glucose sensors and closed-loop insulin delivery systems. These devices function due to the swelling and shrinking of glucose-sensitive microgels that are incorporated into silicon-based microdevices. The glucose response of the hydrogel is due to incorporated phenylboronic acid (PBA) side chains. It is shown that in the presence of glucose, these polymers alter their swelling properties, either by ionization or by formation of glucose-mediated reversible crosslinks. Swelling pressures impinge on microdevice structures, leading either to a change in resonant frequency of a microcircuit, or valving action. Potential areas for future development and improvement are described. Finally, an asymmetric nano-microporous membrane, which may be integrated with the glucose-sensitive devices, is described. This membrane, formed using photolithography and block polymer assembly techniques, can be functionalized to enhance its biocompatibility and solute size selectivity. The work described here features the interplay of design considerations at the supramolecular, nano, and micro scales.
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Affiliation(s)
- Ronald A Siegel
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN 55455, USA.
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780
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Akagi Y, Matsunaga T, Shibayama M, Chung UI, Sakai T. Evaluation of Topological Defects in Tetra-PEG Gels. Macromolecules 2009. [DOI: 10.1021/ma9019009] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuki Akagi
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takuro Matsunaga
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Mitsuhiro Shibayama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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781
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Tang Q, Sun X, Li Q, Wu J, Lin J. A simple route to interpenetrating network hydrogel with high mechanical strength. J Colloid Interface Sci 2009; 339:45-52. [DOI: 10.1016/j.jcis.2009.07.026] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 06/05/2009] [Accepted: 07/13/2009] [Indexed: 10/20/2022]
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782
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Groll J, Singh S, Albrecht K, Moeller M. Biocompatible and degradable nanogels via oxidation reactions of synthetic thiomers in inverse miniemulsion. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23595] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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783
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784
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Matsunaga T, Sakai T, Akagi Y, Chung UI, Shibayama M. SANS and SLS Studies on Tetra-Arm PEG Gels in As-Prepared and Swollen States. Macromolecules 2009. [DOI: 10.1021/ma901013q] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takuro Matsunaga
- The Institute for Solid State Physics, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takamasa Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yuki Akagi
- Department of Bioengineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ung-il Chung
- Department of Bioengineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Mitsuhiro Shibayama
- The Institute for Solid State Physics, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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785
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Peleg O, Kröger M, Rabin Y. Effect of network topology on phase separation in two-dimensional Lennard-Jones networks. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 79:040401. [PMID: 19518163 DOI: 10.1103/physreve.79.040401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2008] [Indexed: 05/27/2023]
Abstract
We generate two-dimensional Lennard-Jones networks with random topology by preparing a perfect four-functional network of identical harmonic springs and randomly cutting some of the springs. Using molecular-dynamics simulations we find that the fraction p of active springs affects both the temperature of phase separation and the type of structures observed below this temperature, from networklike high-density patterns at p>0.5 ("gel") to dropletlike structures at p<0.5 ("sol"). In the gel domain, these patterns are determined by the interplay between free energy and network topology, with the former dominant as p-->1 and the latter as p-->0.5 .
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Affiliation(s)
- Orit Peleg
- Department of Materials, Polymer Physics, ETH Zürich, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland.
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786
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Matsunaga T, Sakai T, Akagi Y, Chung UI, Shibayama M. Structure Characterization of Tetra-PEG Gel by Small-Angle Neutron Scattering. Macromolecules 2009. [DOI: 10.1021/ma802280n] [Citation(s) in RCA: 222] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takuro Matsunaga
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan, and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takamasa Sakai
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan, and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yuki Akagi
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan, and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ung-il Chung
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan, and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Mitsuhiro Shibayama
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan, and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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