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Tran VT, Mredha MTI, Pathak SK, Yoon H, Cui J, Jeon I. Conductive Tough Hydrogels with a Staggered Ion-Coordinating Structure for High Self-Recovery Rate. ACS Appl Mater Interfaces 2019; 11:24598-24608. [PMID: 31246394 DOI: 10.1021/acsami.9b06478] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Conductive hydrogels are attracting increasing attention owing to their great potential for applications in flexible devices. For practical use, these high-water-content materials should not only show good conductivity but also be strong, stretchable, tough, and elastic. Herein, we describe a class of novel conductive tough hydrogels based on strong staggered Fe3+-carboxyl coordinating interactions. They are made from copolymers of acrylamide and N-acryloyl glutamic acid, a bidentate-based comonomer. The design of the staggered structure of Fe3+ and bidentate units is expected to enable energy dissipation and also results in a synergetic effect of two binding sites for fast self-recovery. We demonstrate that the equilibrated hydrogels with a water content of 53 wt % exhibit superior mechanical properties (e.g., highest tensile strength, 12.1 MPa; Young's modulus, 36.1 MPa; work of extension, 42.1 MJ m-3; fracture energy, 10,691 J m-2; compressive strength, 65.1 MPa at 98% strain without a macroscopic fracture) compared to the ion-coordinated hydrogels reported to date, including elasticity at small strain, fast self-recoverability at room temperature (∼25 °C), a high dielectric constant (k = 341-1395 at 100 kHz), and good electrical conductivity (0.0018-0.024 S cm-1). Given their extraordinary overall characteristics, we envision their potential applications in flexible electronic devices.
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Affiliation(s)
- Van Tron Tran
- School of Mechanical Engineering , Chonnam National University , 77 Yongbong-ro , Buk-gu, Gwangju 61186 , Republic of Korea
| | - Md Tariful Islam Mredha
- School of Mechanical Engineering , Chonnam National University , 77 Yongbong-ro , Buk-gu, Gwangju 61186 , Republic of Korea
| | - Suraj Kumar Pathak
- School of Mechanical Engineering , Chonnam National University , 77 Yongbong-ro , Buk-gu, Gwangju 61186 , Republic of Korea
| | - Hyungsuk Yoon
- School of Mechanical Engineering , Chonnam National University , 77 Yongbong-ro , Buk-gu, Gwangju 61186 , Republic of Korea
- Korea Research Institute of Standards and Science (KRISS) , 267 Gajeong-ro , Yuseong-gu, Daejeon 34113 , Republic of Korea
| | - Jiaxi Cui
- INM - Leibniz Institute for New Materials , Campus D2 2, Saarbrücken 66123 , Germany
- Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu , Sichuan 610054 , China
| | - Insu Jeon
- School of Mechanical Engineering , Chonnam National University , 77 Yongbong-ro , Buk-gu, Gwangju 61186 , Republic of Korea
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Tran VT, Xu X, Mredha MTI, Cui J, Vlassak JJ, Jeon I. Hydrogel bowls for cleaning oil spills on water. Water Res 2018; 145:640-649. [PMID: 30205335 DOI: 10.1016/j.watres.2018.09.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 08/24/2018] [Accepted: 09/04/2018] [Indexed: 06/08/2023]
Abstract
We demonstrate a hydrogel bowl capable of selectively and rapidly collecting spilled oil while floating on water. The bowl has macroscopic openings in its sidewall, and its surface is first coated with octadecyltrichlorosilane (OTS) and then with diffusion pump oil, which imparts exceptional hydrophobic, oleophilic, and high oil wettability properties. The use of a hydrogel makes it possible to obtain surface hydrophobicity and oleophilicity, while also being inexpensive, eco-friendly, and easy to fabricate. Using a prototype of the bowl and a small pump system, we demonstrate that oils with a broad range of viscosities (2.7-2000.0 cSt at 20-40 °C) are more rapidly and efficiently collected from the surface of both pure water and seawater than with any other reported technique. The hydrogel bowl can collect oil for more than one month without losing its efficiency and can be stored in oil for reuse. Therefore, such hydrogel bowls represent a new alternative to conventional oil spill remediation techniques.
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Affiliation(s)
- Van Tron Tran
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Xiubin Xu
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea; Department of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Md Tariful Islam Mredha
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Jiaxi Cui
- INM-Leibniz Institute for New Materials, Campus D2 2, Saarbrücken 66123, Germany
| | - Joost J Vlassak
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Insu Jeon
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
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Mredha MTI, Tran VT, Jeong SG, Seon JK, Jeon I. A diffusion-driven fabrication technique for anisotropic tubular hydrogels. Soft Matter 2018; 14:7706-7713. [PMID: 30187062 DOI: 10.1039/c8sm01235k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A bio-inspired, simple, and versatile diffusion-driven method to fabricate complex tubular hydrogels is reported. The controlled diffusion of small ions from a pre-designed core hydrogel through a biopolymer reservoir solution causes the self-gelation of biopolymers with an anisotropic ordered structure on the surface of the core hydrogel. By controlling the concentration, diffusion time, and flow direction of the ions, as well as the size and shape of the core, various types of complex tubular-shaped hydrogels with well-defined 3D architectures were fabricated. The mechanical properties of the designed alginate-based tubular hydrogels were highly tunable and comparable to those of native blood vessels. The method was applied to form a living-cell encapsulated tubular hydrogel, which further strengthens its potential for biomedical applications. The method is suitable for biopolymer-based reaction-diffusion systems and available for further research on the fabrication of functional biomaterials with various biopolymers.
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Affiliation(s)
- Md Tariful Islam Mredha
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
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Mredha MTI, Guo YZ, Nonoyama T, Nakajima T, Kurokawa T, Gong JP. A Facile Method to Fabricate Anisotropic Hydrogels with Perfectly Aligned Hierarchical Fibrous Structures. Adv Mater 2018; 30. [PMID: 29341264 DOI: 10.1002/adma.201704937] [Citation(s) in RCA: 151] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/19/2017] [Indexed: 05/11/2023]
Abstract
Natural structural materials (such as tendons and ligaments) are comprised of multiscale hierarchical architectures, with dimensions ranging from nano- to macroscale, which are difficult to mimic synthetically. Here a bioinspired, facile method to fabricate anisotropic hydrogels with perfectly aligned multiscale hierarchical fibrous structures similar to those of tendons and ligaments is reported. The method includes drying a diluted physical hydrogel in air by confining its length direction. During this process, sufficiently high tensile stress is built along the length direction to align the polymer chains and multiscale fibrous structures (from nano- to submicro- to microscale) are spontaneously formed in the bulk material, which are well-retained in the reswollen gel. The method is useful for relatively rigid polymers (such as alginate and cellulose), which are susceptible to mechanical signal. By controlling the drying with or without prestretching, the degree of alignment, size of superstructures, and the strength of supramolecular interactions can be tuned, which sensitively influence the strength and toughness of the hydrogels. The mechanical properties are comparable with those of natural ligaments. This study provides a general strategy for designing hydrogels with highly ordered hierarchical structures, which opens routes for the development of many functional biomimetic materials for biomedical applications.
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Affiliation(s)
| | - Yun Zhou Guo
- Graduate School of Life Science, Hokkaido University, Sapporo, 001-0021, Japan
| | - Takayuki Nonoyama
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, 001-0021, Japan
| | - Tasuku Nakajima
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, 001-0021, Japan
| | - Takayuki Kurokawa
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, 001-0021, Japan
| | - Jian Ping Gong
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, 001-0021, Japan
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Nonoyama T, Wada S, Kiyama R, Kitamura N, Mredha MTI, Zhang X, Kurokawa T, Nakajima T, Takagi Y, Yasuda K, Gong JP. Double-Network Hydrogels Strongly Bondable to Bones by Spontaneous Osteogenesis Penetration. Adv Mater 2016; 28:6740-6745. [PMID: 27184968 DOI: 10.1002/adma.201601030] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/15/2016] [Indexed: 06/05/2023]
Abstract
On implanting hydroxyapatite-mineralized tough hydrogel into osteochondral defects of rabbits, osteogenesis spontaneously penetrates into the gel matrix owing to the semi-permeablility of the hydrogel. The gradient layer (around 40 μm thick) contributes quite strong bonding of the gel to bone. This is the first success in realizing the robust osteointegration of tough hydrogels, and the method is simple and feasible for practical use.
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Affiliation(s)
- Takayuki Nonoyama
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, 060-0810, Japan
| | - Susumu Wada
- Department of Sports Medicine and Joint Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, 060-0810, Japan
| | - Ryuji Kiyama
- Graduate School of Life Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Nobuto Kitamura
- Department of Sports Medicine and Joint Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, 060-0810, Japan
| | | | - Xi Zhang
- Faculty of Fisheries Science, Hokkaido University, Hakodate, 041-8611, Japan
| | - Takayuki Kurokawa
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, 060-0810, Japan
| | - Tasuku Nakajima
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, 060-0810, Japan
| | - Yasuaki Takagi
- Faculty of Fisheries Science, Hokkaido University, Hakodate, 041-8611, Japan
| | - Kazunori Yasuda
- Department of Sports Medicine and Joint Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, 060-0810, Japan
| | - Jian Ping Gong
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 060-0810, Japan
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, 060-0810, Japan
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Mredha MTI, Zhang X, Nonoyama T, Nakajima T, Kurokawa T, Takagi Y, Gong JP. Swim bladder collagen forms hydrogel with macroscopic superstructure by diffusion induced fast gelation. J Mater Chem B 2015; 3:7658-7666. [PMID: 32264576 DOI: 10.1039/c5tb00877h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Marine collagen has been attracting attention as a medical material in recent times due to the low risk of pathogen infection compared to animal collagen. Type I collagen extracted from the swim bladder of Bester sturgeon fish has excellent characteristics such as high denaturation temperature, high solubility, low viscosity and an extremely fast rate to form large bundle of fibers under certain conditions. These specific characteristics of swim bladder collagen (SBC) permit us to create stable, disk shaped hydrogels with concentric orientation of collagen fibers by the controlled diffusion of neutral buffer through collagen solution at room temperature. However, traditionally used animal collagens, e.g. calf skin collagen (CSC) and porcine skin collagen (PSC), could not form any stable and oriented structure by this method. The mechanism of the superstructure formation of SBC by a diffusion induced gelation process has been explored. The fast fibrillogenesis rate of SBC causes a quick squeezing out of the solvent from the gel phase to the sol phase during gelation, which builds an internal stress at the gel-sol interface. The tensile stress induces the collagen molecules of the gel phase to align along the gel-sol interface direction to give this concentric ring-shaped orientation pattern. On the other hand, the slow fibrillogenesis rate of animal collagens due to the high viscosity of the solution does not favor the ordered structure formation. The denaturation temperature of SBC increases significantly from 31 °C to 43 °C after gelation, whereas that of CSC and PSC were found to increase a little. Rheology experiment shows that the SBC gel has storage modulus larger than 15 kPa. The SBC hydrogels with thermal and mechanical stability have potential as bio-materials for tissue engineering applications.
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