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Wu P, He RH, Fang Y, Chen K, Wu M, Zhang W, Lv J, Zhao Y. The study of double-network carboxymethyl chitosan/sodium alginate based cryogels for rapid hemostasis in noncompressible hemorrhage. Int J Biol Macromol 2024; 266:131399. [PMID: 38641504 DOI: 10.1016/j.ijbiomac.2024.131399] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 03/27/2024] [Accepted: 04/03/2024] [Indexed: 04/21/2024]
Abstract
Developing an injectable hemostatic dressing with shape recovery and high blood absorption ratio for rapid hemostasis in noncompressible hemorrhage maintains a critical clinical challenge. Here, double-network cryogels based on carboxymethyl chitosan, sodium alginate, and methacrylated sodium alginate were prepared by covalent crosslinking and physical crosslinking, and named carboxymethyl chitosan/methacrylated sodium alginate (CM) cryogels. Covalent crosslinking was achieved by methacrylated sodium alginate in the freeze casting process, while physical crosslinking was realized by electrostatic interaction between the amino group of carboxymethyl chitosan and the carboxyl group of sodium alginate. CM cryogels exhibited large water swelling ratios (8167 ± 1062 %), fast blood absorption speed (2974 ± 669 % in 15 s), excellent compressive strength (over 160 kPa for CM100) and shape recovery performance. Compared with gauze and commercial gelatin sponge, better hemostatic capacities were demonstrated for CM cryogel with the minimum blood loss of 40.0 ± 8.9 mg and the lowest hemostasis time of 5.0 ± 2.0 s at hemostasis of rat liver. Made of natural polysaccharides with biocompatibility, hemocompatibility, and cytocompatibility, the CM cryogels exhibit shape recovery and high blood absorption rate, making them promising to be used as an injectable hemostatic dressing for rapid hemostasis in noncompressible hemorrhage.
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Affiliation(s)
- Pan Wu
- Jihua Laboratory, Foshan 528000, People's Republic of China; Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Rong-Huan He
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Yaru Fang
- Jihua Laboratory, Foshan 528000, People's Republic of China
| | - Kezhou Chen
- Jihua Laboratory, Foshan 528000, People's Republic of China; Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Mi Wu
- Jihua Laboratory, Foshan 528000, People's Republic of China
| | - Wenchang Zhang
- Jihua Laboratory, Foshan 528000, People's Republic of China
| | - Jianhua Lv
- Jihua Laboratory, Foshan 528000, People's Republic of China.
| | - Yan Zhao
- Jihua Laboratory, Foshan 528000, People's Republic of China.
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Thomas T, Bakhshiannik A, Nautiyal P, Hutcheson JD, Agarwal A. Freeze casting to engineer gradient porosity in hydroxyapatite-boron nitride nanotube composite scaffold for improved compressive strength and osteogenic potential. J Mech Behav Biomed Mater 2024; 150:106283. [PMID: 38048712 DOI: 10.1016/j.jmbbm.2023.106283] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/24/2023] [Accepted: 11/26/2023] [Indexed: 12/06/2023]
Abstract
Graded porosity plays a crucial role in scaffolds for bone tissue engineering as it facilitates vital processes such as nutrient diffusion, cellular infiltration, and tissue integration. This paper explores the utilization of freeze casting (FC) as a technique to generate composite scaffolds comprising hydroxyapatite (HA) reinforced with 1D-boron nitride nanotubes (BNNTs) featuring graded porosity and improved compressive strength. Comparative studies were conducted using FC at room and sub-zero temperatures to assess the influence of temperature gradient and heat transfer rate on the production of gradient and aligned porosity in HA-BNNT composites. The FC process with a prolonged thermal gradient facilitated the creation of aligned pores in the HA-BNNT, exhibiting a wide distribution of 60% porosity ranging from 1 to 30 μm. Adding high strength 1 vol% BNNT reinforcement resulted in a remarkable 50% enhancement in compressive strength compared to the control sample. Osteoblasts seeded on the HA-BNNT substrate exhibited significantly higher alkaline phosphate activity, indicating accelerated mineralization compared to the control sample. Gradient porosity and wide pore distribution in the HA-BNNT scaffolds promoted osteogenic activities. Overall, the demonstrated FC processing technique and BNNT addition hold great potential for developing functional and biomimetic scaffolds that can effectively promote tissue regeneration, leading to improved clinical outcomes in bone tissue engineering applications.
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Affiliation(s)
- Tony Thomas
- Department of Mechanical and Materials Engineering, USA
| | - Amirala Bakhshiannik
- Department of Biomedical Engineering, Florida International University, Miami, FL, 33174, USA
| | - Pranjal Nautiyal
- School of Mechanical and Aerospace Engineering, Oklahoma State University, USA
| | - Joshua D Hutcheson
- Department of Biomedical Engineering, Florida International University, Miami, FL, 33174, USA
| | - Arvind Agarwal
- Department of Mechanical and Materials Engineering, USA.
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Cyr JA, Colzani M, Bayraktar S, Köhne M, Bax DV, Graup V, Farndale R, Sinha S, Best SM, Cameron RE. Extracellular macrostructure anisotropy improves cardiac tissue-like construct function and phenotypic cellular maturation. Biomater Adv 2023; 155:213680. [PMID: 37944449 DOI: 10.1016/j.bioadv.2023.213680] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 10/02/2023] [Accepted: 10/30/2023] [Indexed: 11/12/2023]
Abstract
Regenerative cardiac tissue is a promising field of study with translational potential as a therapeutic option for myocardial repair after injury, however, poor electrical and contractile function has limited translational utility. Emerging research suggests scaffolds that recapitulate the structure of the native myocardium improve physiological function. Engineered cardiac constructs with anisotropic extracellular architecture demonstrate improved tissue contractility, signaling synchronicity, and cellular organization when compared to constructs with reduced architectural order. The complexity of scaffold fabrication, however, limits isolated variation of individual structural and mechanical characteristics. Thus, the isolated impact of scaffold macroarchitecture on tissue function is poorly understood. Here, we produce isotropic and aligned collagen scaffolds seeded with embryonic stem cell derived cardiomyocytes (hESC-CM) while conserving all confounding physio-mechanical features to independently assess the effects of macroarchitecture on tissue function. We quantified spatiotemporal tissue function through calcium signaling and contractile strain. We further examined intercellular organization and intracellular development. Aligned tissue constructs facilitated improved signaling synchronicity and directional contractility as well as dictated uniform cellular alignment. Cells on aligned constructs also displayed phenotypic and genetic markers of increased maturity. Our results isolate the influence of scaffold macrostructure on tissue function and inform the design of optimized cardiac tissue for regenerative and model medical systems.
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Affiliation(s)
- Jamie A Cyr
- Department of Materials Science & Metallurgy, Cambridge University, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Maria Colzani
- Wellcome-MRC Cambridge Stem Cell Institute, Cambridge University, Jeffrey Cheah Biomedical Centre, Puddicombe Way, Cambridge CB2 0AW, UK
| | - Semih Bayraktar
- Wellcome-MRC Cambridge Stem Cell Institute, Cambridge University, Jeffrey Cheah Biomedical Centre, Puddicombe Way, Cambridge CB2 0AW, UK
| | - Maria Köhne
- Wellcome-MRC Cambridge Stem Cell Institute, Cambridge University, Jeffrey Cheah Biomedical Centre, Puddicombe Way, Cambridge CB2 0AW, UK
| | - Daniel V Bax
- Department of Materials Science & Metallurgy, Cambridge University, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Vera Graup
- Department of Materials Science & Metallurgy, Cambridge University, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Richard Farndale
- Department of Biochemistry, Cambridge University, Hopkins Building Tennis Court Road, Cambridge CB2 1QW, UK
| | - Sanjay Sinha
- Wellcome-MRC Cambridge Stem Cell Institute, Cambridge University, Jeffrey Cheah Biomedical Centre, Puddicombe Way, Cambridge CB2 0AW, UK.
| | - Serena M Best
- Department of Materials Science & Metallurgy, Cambridge University, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
| | - Ruth E Cameron
- Department of Materials Science & Metallurgy, Cambridge University, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
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Liu H, Zhai W, Park CB. Biomimetic hydrophobic plastic foams with aligned channels for rapid oil absorption. J Hazard Mater 2022; 437:129346. [PMID: 35716573 DOI: 10.1016/j.jhazmat.2022.129346] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 04/27/2022] [Revised: 05/25/2022] [Accepted: 06/08/2022] [Indexed: 06/15/2023]
Abstract
Although many oil absorption materials have been developed, it still remains a great challenge to achieve rapid absorption and efficient recovery. Over the past decade, research has focused on the development of freeze casting technology using water as a solvent. The materials prepared by this method have poor water resistance and are difficult to apply to oil absorption in aqueous environments. Here, an organic solvent freeze casting strategy is proposed to fabricate ultralight hydrophobic plastic foams with aligned channel structures. Through microscopy in situ observation, we revealed the growth morphology of ice crystals during directional freezing process. Moreover, aligned porous foams with various channel sizes are fabricated by regulating the cooling rate. We found that organic solvent-assisted freeze casting can enhance the hydrophobicity of the matrix material. These aligned porous foams exhibit excellent liquid absorption performance, with high absorption speed and large absorption capacity over a wide viscosity range. This approach has general applicability and can be used to tailor a wide variety of engineering plastic-based aligned porous foams, as long as they can dissolve in organic solvents.
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Affiliation(s)
- Huawen Liu
- School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Wentao Zhai
- School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, M5S 3G8 Canada.
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Yin TJ, Jeyapalina S, Naleway SE. Characterization of porous fluorohydroxyapatite bone-scaffolds fabricated using freeze casting. J Mech Behav Biomed Mater 2021; 123:104717. [PMID: 34352488 DOI: 10.1016/j.jmbbm.2021.104717] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 07/09/2021] [Accepted: 07/13/2021] [Indexed: 12/01/2022]
Abstract
With the increasing demand for orthopedic and dental reconstruction surgeries, there comes a shortage of viable bone substitutes. This study was therefore designed to assess the efficacy of porous fluorohydroxyapatite (FHA) as a potential bone substitute. For this, porous FHA scaffolds were fabricated using the freeze casting technique. They were then sintered at 1250, 1350 and, 1450 °C, and microstructural, mechanical, and in vitro properties were analyzed. The microstructure analyses revealed the porosity remained constant within the temperature range. However, the pore size decreased with increasing sintering temperature. The greatest compressive strength and elastic modulus were obtained at 1450 °C, which were 13.5 ± 4.0 MPa and 379 ± 182 MPa, respectively. These are comparable values to human trabecular bone and other porous scaffolds made using hydroxyapatite. This analysis has thus helped to attain an understanding of the mechanical and material properties of freeze-cast FHA scaffolds that have not been presented before. In vitro studies revealed an increasing rate of human osteoblast cell proliferation on freeze-cast FHA scaffolds with increasing sintering temperature, suggesting improved osteogenic properties. Additionally, osteoblasts cells were also shown to proliferate into the interior pores of all freeze-cast FHA scaffolds. These results indicate the potential of porous FHA scaffolds fabricated using the freeze-casting technique to be utilized clinically as bone substitutes.
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Affiliation(s)
- Tony J Yin
- Department of Mechanical Engineering, University of Utah, USA
| | - Sujee Jeyapalina
- Division of Plastic Surgery, Department of Surgery, University of Utah Health, USA; Research, Department of Veterans Affairs Salt Lake City Health Care System, USA
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Li F, Xue X, Jia T, Dang W, Zhao K, Tang Y. Lamellar structure/processing relationships and compressive properties of porous Ti6Al4V alloys fabricated by freeze casting. J Mech Behav Biomed Mater 2019; 101:103424. [PMID: 31514056 DOI: 10.1016/j.jmbbm.2019.103424] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 08/20/2019] [Accepted: 09/07/2019] [Indexed: 11/17/2022]
Abstract
Lamellar pores have superior biocompatibility due to their similarity to the lamellar structure of natural bones. In the present work, porous Ti6Al4V alloys with lamellar pores were successfully fabricated by directionally freeze casting. The lamellar structure/processing relationships were systematically studied through analyzing the interaction between ice front and alloy powders. The structural feature of translamella bridges is observed in the lamellar structure. The volume shrinkage of porous Ti6Al4V alloys is in the range of 44-60%. This is much higher compared with that of the porous ceramics. The solid content in the slurry exerts a strong influence on the porosity, while the freezing ice front velocity affects the structural wavelength and pore width. With the increase in ice front velocity, the structural wavelength decreases by an exponential function. The lamella formation mechanism and porosity gradient along the freezing direction were discussed. Young's modulus and yield stress of porous Ti6Al4V alloys fall in the range of 2-12 GPa and 40-300 MPa, respectively. The dominant compressive deformation mode is lamella buckling and splitting. The fabricated porous Ti6Al4V alloys possess higher relative yield stress.
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Affiliation(s)
- Fuping Li
- Xi'an University of Technology, Xi'an, Shaanxi, 710048, PR China.
| | - Xiangyi Xue
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, PR China
| | - Tao Jia
- Xi'an University of Technology, Xi'an, Shaanxi, 710048, PR China
| | - Wei Dang
- Xi'an University of Technology, Xi'an, Shaanxi, 710048, PR China
| | - Kang Zhao
- Xi'an University of Technology, Xi'an, Shaanxi, 710048, PR China
| | - Yufei Tang
- Xi'an University of Technology, Xi'an, Shaanxi, 710048, PR China
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Hong K, Park H, Kim Y, Knapek M, Minárik P, Máthis K, Yamamoto A, Choe H. Mechanical and biocorrosive properties of magnesium-aluminum alloy scaffold for biomedical applications. J Mech Behav Biomed Mater 2019; 98:213-224. [PMID: 31271978 DOI: 10.1016/j.jmbbm.2019.06.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 05/14/2019] [Accepted: 06/20/2019] [Indexed: 10/26/2022]
Abstract
This study investigates the morphology, microstructure, compressive behavior, biocorrosion properties, and cytocompatibility of magnesium (Mg)-aluminum (Al) alloy (AE42) scaffolds for their potential use in biodegradable biomedical applications. Mg alloy scaffolds were successfully synthesized via a camphene-based freeze-casting process with precisely controlled heat treatment. The average porosity was approximately 52% and the median pore diameter was ∼13 μm. Salient deformation mechanisms were identified using acoustic emission (AE) signals and adaptive sequential k-means (ASK) analysis. Twinning, dislocation slip, strut bending, and collapse were dominant during compressive deformation. Nonetheless, the overall compressive behavior and deformation mechanisms were similar to those of bulk Mg based on ASK analysis. The corrosion potential of the Mg alloy scaffold (-1.44 V) was slightly higher than that of bulk AE42 (-1.60 V), but the corrosion rate of the Mg alloy scaffold was faster than that of bulk AE42 due to the enhanced surface area of the Mg alloy scaffold. As a result of cytocompatibility evaluation following ISO10993-5, the concentration of the Mg alloy scaffold extract reducing cell growth rate to 50% (IC50) was 10.7%, which is higher (less toxic) than 5%, suggesting no severe inflammation by implantation into muscle.
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Affiliation(s)
- Kicheol Hong
- School of Materials Science and Engineering, Kookmin University, Seoul, 136-702, Republic of Korea
| | - Hyeji Park
- School of Materials Science and Engineering, Kookmin University, Seoul, 136-702, Republic of Korea
| | - Yunsung Kim
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Michal Knapek
- Department of Physics of Materials, Charles University, Ke Karlovu 5, CZ12116 Prague 2, Czech Republic
| | - Peter Minárik
- Department of Physics of Materials, Charles University, Ke Karlovu 5, CZ12116 Prague 2, Czech Republic
| | - Kristián Máthis
- Department of Physics of Materials, Charles University, Ke Karlovu 5, CZ12116 Prague 2, Czech Republic.
| | - Akiko Yamamoto
- (d)Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
| | - Heeman Choe
- School of Materials Science and Engineering, Kookmin University, Seoul, 136-702, Republic of Korea
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Al-Jawoosh S, Ireland A, Su B. Fabrication and characterisation of a novel biomimetic anisotropic ceramic/polymer-infiltrated composite material. Dent Mater 2018; 34:994-1002. [PMID: 29653726 DOI: 10.1016/j.dental.2018.03.008] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 03/11/2018] [Accepted: 03/23/2018] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To fabricate and characterise a novel biomimetic composite material consisting of aligned porous ceramic preforms infiltrated with polymer. METHOD Freeze-casting was used to fabricate and control the microstructure and porosity of ceramic preforms, which were subsequently infiltrated with 40-50% by volume UDMA-TEGDMA polymer. The composite materials were then subjected to characterisation, namely density, compression, three-point bend, hardness and fracture toughness testing. Samples were also subjected to scanning electron microscopy and computerised tomography (Micro-CT). RESULTS Three-dimensional aligned honeycomb-like ceramic structures were produced and full interpenetration of the polymer phase was observed using micro-CT. Depending on the volume fraction of the ceramic preform, the density of the final composite ranged from 2.92 to 3.36g/cm3, compressive strength ranged from 206.26 to 253.97MPa, flexural strength from 97.73 to 145.65MPa, hardness ranged from 1.46 to 1.62GPa, and fracture toughness from 3.91 to 4.86MPam1/2. SIGNIFICANCE Freeze-casting provides a novel method to engineer composite materials with a unique aligned honeycomb-like interpenetrating structure, consisting of two continuous phases, inorganic and organic. There was a correlation between the ceramic fraction and the subsequent, density, strength, hardness and fracture toughness of the composite material.
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Affiliation(s)
- Sara Al-Jawoosh
- Biomaterials Engineering Group, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol, BS1 2LY, UK.
| | - Anthony Ireland
- Child Dental Health, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol, BS1 2LY, UK
| | - Bo Su
- Biomaterials Engineering Group, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol, BS1 2LY, UK
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Yan L, Wu J, Zhang L, Liu X, Zhou K, Su B. Pore structures and mechanical properties of porous titanium scaffolds by bidirectional freeze casting. Mater Sci Eng C Mater Biol Appl 2016; 75:335-340. [PMID: 28415469 DOI: 10.1016/j.msec.2016.12.044] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 11/25/2016] [Accepted: 12/04/2016] [Indexed: 11/24/2022]
Abstract
Porous titanium scaffolds with long-range lamellar structure were fabricated using a novel bidirectional freeze casting method. Compared with the ordinarily porous titanium materials made by traditional freeze casting, the titanium walls can offer the structure of ordered arrays with parallel to each other in the transverse cross-sections. And titanium scaffolds with different pore width, wall size and porosity can be synthesized in terms of adjusting the fabrication parameters. As the titanium content was increased from 15vol.% to 25vol.%, the porosity and pore width decreased from 67±3% to 50±2% and 80±10μm to 67±7μm, respectively. On the contrary, as the wall size was increased from 18±2μm to 30±3μm, the compressive strength and stiffness were increased from 58±8MPa to 162±10MPa and from 2.5±0.7GPa to 6.5±0.9GPa, respectively. The porous titanium scaffolds with long-range lamellar structure and controllable pore structure produced in present work will be capable of having potential application as bone tissue scaffold materials.
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Affiliation(s)
- Leiming Yan
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R. China
| | - Jisi Wu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R. China
| | - Lei Zhang
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R. China.
| | - Xinli Liu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R. China
| | - Kechao Zhou
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R. China
| | - Bo Su
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS1 2LY, UK
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