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Hou X, Sitthisang S, Song B, Xu X, Jonhson W, Tan Y, Yodmuang S, He C. Entropically Toughened Robust Biodegradable Polymer Blends and Composites for Bone Tissue Engineering. ACS Appl Mater Interfaces 2024; 16:2912-2920. [PMID: 38174974 DOI: 10.1021/acsami.3c14716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Biodegradable polymers and composites are promising candidates for biomedical implants in tissue engineering. However, state-of-the-art composite scaffolds suffer from a strength-toughness dilemma due to poor interfacial adhesion and filler dispersion. In this work, we propose a facile and scalable strategy to fabricate strong and tough biocomposite scaffolds through interfacial toughening. The immiscible biopolymer matrix is compatible by the direct incorporation of a third polymer. Densely entangled polymer chains lead to massive crazes and global shear yields under tension. Weak chemical interaction and high-shear melt processing create nanoscale dispersion of nanofillers within the matrix. The resultant ternary blends and composites exhibit an 11-fold increase in toughness without compromising stiffness and strength. At 70% porosity, three-dimensional (3D)-printed composite scaffolds demonstrate high compressive properties comparable to those of cancellous bones. In vitro cell culture on the scaffolds demonstrates not only good cell viability but also effective osteogenic differentiation of human mesenchymal stem cells. Our findings present a widely applicable strategy to develop high-performance biocomposite materials for tissue regeneration.
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Affiliation(s)
- Xunan Hou
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Sonthikan Sitthisang
- Research Affairs, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathum Wan, Bangkok 10330, Thailand
| | - Bangjie Song
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Xin Xu
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Win Jonhson
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Yonghao Tan
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Supansa Yodmuang
- Research Affairs, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathum Wan, Bangkok 10330, Thailand
- Center of Excellence in Biomaterial Engineering in Medical and Health, Chulalongkorn University, Bangkok 10330 Thailand
| | - Chaobin He
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research (A*STAR), 2 Fusionopolis Way, Innovis 138635, Singapore
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Shou Y, Teo XY, Li X, Zhicheng L, Liu L, Sun X, Jonhson W, Ding J, Lim CT, Tay A. Dynamic Magneto-Softening of 3D Hydrogel Reverses Malignant Transformation of Cancer Cells and Enhances Drug Efficacy. ACS Nano 2023; 17:2851-2867. [PMID: 36633150 DOI: 10.1021/acsnano.2c11278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
High extracellular matrix stiffness is a prominent feature of malignant tumors associated with poor clinical prognosis. To elucidate mechanistic connections between increased matrix stiffness and tumor progression, a variety of hydrogel scaffolds with dynamic changes in stiffness have been developed. These approaches, however, are not biocompatible at high temperature, strong irradiation, and acidic/basic pH, often lack reversibility (can only stiffen and not soften), and do not allow study on the same cell population longitudinally. In this work, we develop a dynamic 3D magnetic hydrogel whose matrix stiffness can be wirelessly and reversibly stiffened and softened multiple times with different rates of change using an external magnet. With this platform, we found that matrix stiffness increased tumor malignancy including denser cell organization, epithelial-to-mesenchymal transition and hypoxia. More interestingly, these malignant transformations could be halted or reversed with matrix softening (i.e., mechanical rescue), to potentiate drug efficacy attributing to reduced solid stress from matrix and downregulation of cell mechano-transductors including YAP1. We propose that our platform can be used to deepen understanding of the impact of matrix softening on cancer biology, an important but rarely studied phenomenon.
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Affiliation(s)
- Yufeng Shou
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
| | - Xin Yong Teo
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
| | - Xianlei Li
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
| | - Le Zhicheng
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
| | - Ling Liu
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
- NUS Tissue Engineering Program, National University of Singapore, 117510, Singapore
| | - Xinhong Sun
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
| | - Win Jonhson
- Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore
| | - Chwee Teck Lim
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
- Mechanobiology Institute, National University of Singapore, 117411, Singapore
| | - Andy Tay
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Institute for Health Innovation & Technology, National University of Singapore, 117599, Singapore
- NUS Tissue Engineering Program, National University of Singapore, 117510, Singapore
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Xu X, He J, Li Y, Fu G, Cao Q, Zhang D, Tan YH, Gao M, Li W, Li C, Jonhson W, Xiao S, Ding J. Integration of Surface Modified Aqueous Ink for Multi-functional Material Extrusion. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Jonhson W, Xu X, Zhang D, Chua WT, Tan YH, Liu X, Guan C, Tan XH, Li Y, Herng TS, Goh JCH, Wang J, He H, Ding J. Fabrication of 3D-Printed Ceramic Structures for Portable Solar Desalination Devices. ACS Appl Mater Interfaces 2021; 13:23220-23229. [PMID: 33955218 DOI: 10.1021/acsami.1c04209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Affiliation(s)
- Win Jonhson
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Xi Xu
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
- Institute of Flexible Electronics, Xi’an Key Laboratory of Flexible Electronics, Northwestern Polytechnical University, Xi’an 710072, China
| | - Danwei Zhang
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Wei Ting Chua
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Yong Hao Tan
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Ximeng Liu
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Cao Guan
- Institute of Flexible Electronics, Xi’an Key Laboratory of Flexible Electronics, Northwestern Polytechnical University, Xi’an 710072, China
| | - Xuan Hao Tan
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, 4 Engineering Drive 3, Block E4, Singapore 117583, Singapore
| | - Yuemeng Li
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Tun Seng Herng
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - James Cho-Hong Goh
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, 4 Engineering Drive 3, Block E4, Singapore 117583, Singapore
| | - John Wang
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
| | - Hui He
- School of Mechanical Engineering, Shanghai Jiaotong University, F306 Mechanical Building 800 Dongchuan Road Minhang, Shanghai 200240, China
| | - Jun Ding
- Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA, Singapore 117575, Singapore
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Li J, Song P, Zhao J, Vaklinova K, Zhao X, Li Z, Qiu Z, Wang Z, Lin L, Zhao M, Herng TS, Zuo Y, Jonhson W, Yu W, Hai X, Lyu P, Xu H, Yang H, Chen C, Pennycook SJ, Ding J, Teng J, Castro Neto AH, Novoselov KS, Lu J. Printable two-dimensional superconducting monolayers. Nat Mater 2021; 20:181-187. [PMID: 33106649 DOI: 10.1038/s41563-020-00831-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
Two-dimensional superconductor (2DSC) monolayers with non-centrosymmetry exhibit unconventional Ising pair superconductivity and an enhanced upper critical field beyond the Pauli paramagnetic limit, driving intense research interest. However, they are often susceptible to structural disorder and environmental oxidation, which destroy electronic coherence and provide technical challenges in the creation of artificial van der Waals heterostructures (vdWHs) for devices. Herein, we report a general and scalable synthesis of highly crystalline 2DSC monolayers via a mild electrochemical exfoliation method using flexible organic ammonium cations solvated with neutral solvent molecules as co-intercalants. Using NbSe2 as a model system, we achieved a high yield (>75%) of large-sized single-crystal monolayers up to 300 µm. The as-fabricated, twisted NbSe2 vdWHs demonstrate high stability, good interfacial properties and a critical current that is modulated by magnetic field when one flux quantum fits to an integer number of moiré cells. Additionally, formulated 2DSC inks can be exploited to fabricate wafer-scale 2D superconducting wire arrays and three-dimensional superconducting composites with desirable morphologies.
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Affiliation(s)
- Jing Li
- Department of Chemistry, National University of Singapore, Singapore, Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, Singapore
| | - Peng Song
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Jinpei Zhao
- Department of Physics, National University of Singapore, Singapore, Singapore
| | - Kristina Vaklinova
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, Singapore
| | - Xiaoxu Zhao
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Zejun Li
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Zhizhan Qiu
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Zihao Wang
- National Graphene Institute, University of Manchester, Manchester, UK
| | - Li Lin
- National Graphene Institute, University of Manchester, Manchester, UK
| | - Meng Zhao
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tun Seng Herng
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Yuxin Zuo
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Win Jonhson
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Wei Yu
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Xiao Hai
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Pin Lyu
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Haomin Xu
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Huimin Yang
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Cheng Chen
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Stephen J Pennycook
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Jun Ding
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Jinghua Teng
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - A H Castro Neto
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, Singapore
- Department of Physics, National University of Singapore, Singapore, Singapore
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore
| | - Kostya S Novoselov
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, Singapore.
- Department of Materials Science & Engineering, National University of Singapore, Singapore, Singapore.
- National Graphene Institute, University of Manchester, Manchester, UK.
| | - Jiong Lu
- Department of Chemistry, National University of Singapore, Singapore, Singapore.
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, Singapore.
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Alzakia FI, Jonhson W, Ding J, Tan SC. Ultrafast Exfoliation of 2D Materials by Solvent Activation and One-Step Fabrication of All-2D-Material Photodetectors by Electrohydrodynamic Printing. ACS Appl Mater Interfaces 2020; 12:28840-28851. [PMID: 32469199 DOI: 10.1021/acsami.0c06279] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Large-scale liquid exfoliation of two-dimensional materials such as molybdenum disulfide, tungsten disulfide, and graphene for the synthesis of printable inks is still inefficient due to many hours of exfoliation time needed to achieve a highly concentrated dispersion that is useful for printing. Here, we report that soaking the bulk 2D material powders in a variety of solvents (water, ethanol, isopropanol, acetone, methanol, dimethylformamide, N-methyl pyrrolidone, and hexane) briefly as short as 5 min "activates" them to be much more easily exfoliated afterward. The unsoaked powder yielded a negligible concentration of dispersed nanosheets (less than 0.01 mg/mL) even after long hours of sonication, while the powders soaked in water resulted in dispersed nanosheets of 1.21 mg/mL for MoS2 and 1.28 mg/mL for WS2 after 6 and 4 h of sonication, respectively, a more than 100 time increase. For graphene, soaking in methanol for 5 min prior to sonication for 6 h yielded an increase in the dispersed nanosheet concentration to 0.13 mg/mL, a more than 10 time increase in concentration. The enhanced exfoliation is originated not from the intercalated solvent molecules but from the slightly increased d-spacing of the bulk powders during soaking due to the different dielectric environments in the solvents, which assists in the exfoliation afterward. We further fabricated MoS2 and WS2 photodetectors with graphene as electrodes by one-step electrohydrodynamic (EHD) printing using highly concentrated inks (>2 mg/mL) obtained by ultrafast liquid exfoliation, which have light sensitivity down to 0.05 sun. We believe that this ultrafast exfoliation technique combined with the one-step device printing technique enables a big step toward the mass production of functional devices fabricated from solution-processed 2D material inks.
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Affiliation(s)
- Fuad Indra Alzakia
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117574
| | - Win Jonhson
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117574
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117574
| | - Swee Ching Tan
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117574
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