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学者姓名:李涤尘

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< Page ,Total 71 >
3D Printing of Layered Gradient Pore Structure of Brain-like Tissue SCIE
期刊论文 | 2021 , 7 (3) , 71-85 | INTERNATIONAL JOURNAL OF BIOPRINTING
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Y YThe pathological research and drug development of brain diseases require appropriate brain models. Given the complex, layered structure of the cerebral cortex, as well as the constraints on the medical ethics and the inaccuracy of animal models, it is necessary to construct a brain-like model in vitro. In this study, we designed and built integrated three-dimensional (3D) printing equipment for cell printing/culture, which can guarantee cell viability in the printing process and provide the equipment foundation for manufacturing the layered structures with gradient distribution of pore size. Based on this printing equipment, to achieve the purpose of printing the layered structures with multiple materials, we conducted research on the performance of bio-inks with different compositions and optimized the printing process. By extruding and stacking materials, we can print the layered structure with the uniform distribution of cells and the gradient distribution of pore sizes. Finally, we can accurately print a structure with 30 layers. The line width (resolution) of the printed monolayer structure was about 478 mu m, the forming accuracy can reach 97.24%, and the viability of cells in the printed structure is as high as 94.5%.

Keyword :

Integrated cell printing/culture equipment 3D bio-printing Layered gradient structure Brain-like model

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GB/T 7714 Pei, Na , Hao, Zhiyan , Wang, Sen et al. 3D Printing of Layered Gradient Pore Structure of Brain-like Tissue [J]. | INTERNATIONAL JOURNAL OF BIOPRINTING , 2021 , 7 (3) : 71-85 .
MLA Pei, Na et al. "3D Printing of Layered Gradient Pore Structure of Brain-like Tissue" . | INTERNATIONAL JOURNAL OF BIOPRINTING 7 . 3 (2021) : 71-85 .
APA Pei, Na , Hao, Zhiyan , Wang, Sen , Pan, Binglei , Fang, Ao , Kang, Jianfeng et al. 3D Printing of Layered Gradient Pore Structure of Brain-like Tissue . | INTERNATIONAL JOURNAL OF BIOPRINTING , 2021 , 7 (3) , 71-85 .
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Laser powder-bed-fusion of Si3N4 reinforced AlSi10Mg composites: Processing, mechanical properties and strengthening mechanisms EI SCIE
期刊论文 | 2021 , 825 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Abstract :

Laser powder-bed-fusion (L-PBF) was utilized to fabricate Si3N4 reinforced AlSi10Mg composites in this study. The Response Surface Methodology (RSM) was employed to optimize L-PBF processing parameters. The effects of the addition of Si3N4 on the mechanical properties of the L-PBFed Si3N4/AlSi10Mg composites were studied. The microstructures and phase of as-built Si3N4/AlSi10Mg composites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD). The results showed that 10 vol% Si3N4/AlSi10Mg composites exhibited excellent tensile strength, yield strength, elastic modulus, and microhardness, which reached 485 +/- 12 MPa, 362 +/- 18 MPa, 103 +/- 11 GPa, and 153 +/- 3HV, respectively, when the optimal L-PBF process parameters were applied (laser power of 193 W, scan speed of 559 mm/s, hatching space of 0.048 mm). The enhancement effect stemmed from the dislocation strengthening and load transfer mechanism brought about by Si3N4 particles. In L-PBF: the heat conduction of the molten pool was hindered by Si3N4 particles, leading to a reduction of the coarse molten pool. Simultaneously, whilst the mutual diffusion of Al and Si elements occurred, no new brittle phases formed, which improved the bonding strength between the Al matrix and the Si3N4 particles.

Keyword :

Mechanical properties Laser powder-bed-fusion (L-PBF) AlSi10Mg Strengthening mechanisms Si3N4

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GB/T 7714 Miao, Kai , Zhou, Hang , Gao, Yunpeng et al. Laser powder-bed-fusion of Si3N4 reinforced AlSi10Mg composites: Processing, mechanical properties and strengthening mechanisms [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 825 .
MLA Miao, Kai et al. "Laser powder-bed-fusion of Si3N4 reinforced AlSi10Mg composites: Processing, mechanical properties and strengthening mechanisms" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 825 (2021) .
APA Miao, Kai , Zhou, Hang , Gao, Yunpeng , Deng, Xin , Lu, Zhongliang , Li, Dichen . Laser powder-bed-fusion of Si3N4 reinforced AlSi10Mg composites: Processing, mechanical properties and strengthening mechanisms . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 825 .
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Effects of Boehmite on the Calcination Shrinkage and Mechanical Properties of Gypsum-Bonded Molds SCIE
期刊论文 | 2021 | ADVANCED ENGINEERING MATERIALS
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Calcination shrinkage is an essential factor in the evaluation of a gypsum-bonded mold. Typically, if traditional fillers are used in a gypsum-bonded mold, it is difficult to maintain sufficient strength due to the high dosages of fillers. Herein, a new filler system of gypsum, boehmite, is proposed to more efficiently compensate for shrinkage, while minimizing the impact on the strength. The effects of the fillers on the calcination shrinkages and mechanical properties of the gypsum-bonded molds are studied. The phase transition and thermal expansion behaviors of the gypsum-bonded molds are tested by thermal gravimetric analysis/differential scanning calorimetry (TG/DSC) and a thermal dilatometer. The microstructures of the fillers and gypsum-bonded molds are characterized by a scanning electron microscope (SEM). The results show that the dosage of boehmite for near-zero shrinkage is reduced to about 35 wt%, with the bending strength of the gypsum-bonded mold remaining above 2 MPa throughout the whole calcination process. The mechanism of calcination expansion is revealed and ultimately attributed to the splitting of boehmite particles. This research provides a novel gypsum-bonded mold for required high dimensional and mechanical properties, elevating the ability to form complex structures.

Keyword :

boehmite bending strengths calcination shrinkages gypsum-bonded molds

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GB/T 7714 Miao, Kai , Wang, Zhongrui , He, Ran et al. Effects of Boehmite on the Calcination Shrinkage and Mechanical Properties of Gypsum-Bonded Molds [J]. | ADVANCED ENGINEERING MATERIALS , 2021 .
MLA Miao, Kai et al. "Effects of Boehmite on the Calcination Shrinkage and Mechanical Properties of Gypsum-Bonded Molds" . | ADVANCED ENGINEERING MATERIALS (2021) .
APA Miao, Kai , Wang, Zhongrui , He, Ran , Jin, Lei , Song, Zhaowei , Yu, Ruilong et al. Effects of Boehmite on the Calcination Shrinkage and Mechanical Properties of Gypsum-Bonded Molds . | ADVANCED ENGINEERING MATERIALS , 2021 .
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High Performance NbMoTa-Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition EI SCIE PubMed
期刊论文 | 2021 , 14 (7) | MATERIALS
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The conventional method of preparing metal-ceramic composite structures causes delamination and cracking defects due to differences in the composite structures' properties, such as the coefficient of thermal expansion between metal and ceramic materials. Laser-directed energy deposition (LDED) technology has a unique advantage in that the composition of the materials can be changed during the forming process. This technique can overcome existing problems by forming composite structures. In this study, a multilayer composite structure was prepared using LDED technology, and different materials were deposited with their own appropriate process parameters. A layer of Al2O3 ceramic was deposited first, and then three layers of a NbMoTa multi-principal element alloy (MPEA) were deposited as a single composite structural unit. A specimen of the NbMoTa-Al2O3 multilayer composite structure, composed of multiple composite structural units, was formed on the upper surface of a phi 20 mm x 60 mm cylinder. The wear resistance was improved by 55% compared to the NbMoTa. The resistivity was 1.55 x 10(-5) ohm x m in the parallel forming direction and 1.29 x 10(-7) ohm x m in the vertical forming direction. A new, electrically anisotropic material was successfully obtained, and this study provides experimental methods and data for the preparation of smart materials and new sensors.

Keyword :

ceramic composite structures metal&#8211 anisotropy laser additive manufacturing MPEA

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GB/T 7714 Zhang, Hang , Chen, Zihao , He, Yaoyao et al. High Performance NbMoTa-Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition [J]. | MATERIALS , 2021 , 14 (7) .
MLA Zhang, Hang et al. "High Performance NbMoTa-Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition" . | MATERIALS 14 . 7 (2021) .
APA Zhang, Hang , Chen, Zihao , He, Yaoyao , Guo, Xin , Li, Qingyu , Ji, Shaokun et al. High Performance NbMoTa-Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition . | MATERIALS , 2021 , 14 (7) .
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Topological design and biomechanical evaluation for 3D printed multi-segment artificial vertebral implants EI SCIE PubMed
期刊论文 | 2021 , 127 | MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
WoS CC Cited Count: 1
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Abstract :

Customized spinal implants fabricated by additive manufacturing have been increasingly used clinically to restore the physiological functions. However, the mechanisms and methods about the design for the spinal implants are not clear, especially for the reconstruction of multi-segment vertebral. This study aims to develop a novel multi-objective optimization methodology based on various normal spinal activities, to design the artificial vertebral implant (AVI) with lightweight, high-strength and high-stability. The biomechanical performance for two types of AVI was analyzed and compared under different loading conditions by finite element method. These implants were manufactured via selective laser melting technology and evaluated via compressive testing. Results showed the maximum Mises stress of the optimized implant under various load cases were about 41.5% of that of the trussed implant, and below fatigue strength of 3D printed titanium materials. The optimized implant was about 2 times to trussed implant in term of the maximum compression load and compression stiffness to per unit mass, which indicated the optimized implant can meet the safety requirement. Finally, the optimized implant has been used in clinical practice and good short-term clinical outcomes were achieved. Therefore, the novel developed method provides a favorable guarantee for the design of 3D printed multi-segment artificial vertebral implants.

Keyword :

Additive manufacturing Artificial vertebral implant Finite element analysis Topology optimization design Biomechanical evaluation

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GB/T 7714 Kang, Jianfeng , Dong, Enchun , Li, Xiangdong et al. Topological design and biomechanical evaluation for 3D printed multi-segment artificial vertebral implants [J]. | MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS , 2021 , 127 .
MLA Kang, Jianfeng et al. "Topological design and biomechanical evaluation for 3D printed multi-segment artificial vertebral implants" . | MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS 127 (2021) .
APA Kang, Jianfeng , Dong, Enchun , Li, Xiangdong , Guo, Zheng , Shi, Lei , Li, Dichen et al. Topological design and biomechanical evaluation for 3D printed multi-segment artificial vertebral implants . | MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS , 2021 , 127 .
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A wide-angle broadband electromagnetic absorbing metastructure using 3D printing technology EI SCIE
期刊论文 | 2021 , 208 | MATERIALS & DESIGN
WoS CC Cited Count: 1
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Gradient composite metastructures have been demonstrated in effectively improving the microwave absorbing performance. However, the preparation of the complex structures still remains challenging. Herein, a complex gradient composite microwave absorbing metastructure is designed and fabricated by the low cost, high-efficiency fused deposition modeling of 3D printing technologies. The metastructure is composed of flaky carbonyl iron particles and Polyether-ether-ketone composite which demands only 50% loss material mass addition. Structural parameters are investigated and optimized for absorbing bandwidth and reflectivity intensity. Simulations and experiments demonstrate that the designed complex gradient metastructure with the thickness of 10 mm can achieve the-10 dB absorbing bandwidth in the frequency range from 5.1 to 40 GHz, and the absorbing bandwidth corresponding to-15 dB in 7.7- 14.7 GHz and 22.6-36.3 GHz. Meanwhile, this metastructure also can maintain the broadband and strong microwave absorption with incident angle from 0 degrees to 55 degrees for transverse electric polarization and 0 degrees to 70 degrees for transverse magnetic polarization. Moreover, the proposed metastructure is also demonstrated with good compression strength which shows preferable mechanical stability. This work provides a simple and promising route of broadband and wide-angle microwave strong absorption for practical application. (c) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Keyword :

Broadband absorption Wide-angle absorption 3D printing Complex gradient metastructure Strong absorption

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GB/T 7714 Duan, Yubing , Liang, Qingxuan , Yang, Zhen et al. A wide-angle broadband electromagnetic absorbing metastructure using 3D printing technology [J]. | MATERIALS & DESIGN , 2021 , 208 .
MLA Duan, Yubing et al. "A wide-angle broadband electromagnetic absorbing metastructure using 3D printing technology" . | MATERIALS & DESIGN 208 (2021) .
APA Duan, Yubing , Liang, Qingxuan , Yang, Zhen , Li, Zhaohui , Yin, Haoyu , Cao, Yi et al. A wide-angle broadband electromagnetic absorbing metastructure using 3D printing technology . | MATERIALS & DESIGN , 2021 , 208 .
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3D-printed PEEK implant for mandibular defects repair - a new method EI SCIE PubMed
期刊论文 | 2021 , 116 | Journal of the Mechanical Behavior of Biomedical Materials
WoS CC Cited Count: 3
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Abstract :

Functional reconstruction of large-size mandibular continuity defect is still a major challenge in the oral and maxillofacial surgery due to the unsatisfactory repair effects and various complications. This study aimed to develop a new functional repair method for mandibular defects combined with 3D-printed polyetheretherketone (PEEK) implant and the free vascularized fibula graft, and evaluated the service performance of the implant under whole masticatory motion. The design criteria and workflows of the mandibular reconstruction were established based on the requirements of safety, functionality, and shape consistency. Both the biomechanical behavior and the mechanobiological property of mandibular reconstruction under various masticatory motion were investigated by the finite element analysis. The maximum von Mises stress of each component was lower than the yield strength of the corresponding material and the safety factor was more than 2.3 times, which indicated the security of the repair method can be guaranteed. Moreover, the actual deformation of the reconstruction model was lower than that of the normal mandible under most clenching tasks, which assured the primary stability. More than 80% of the volume elements in the bone graft can obtain effective mechanical stimulation, which benefited to reduce the risks of bone resorption. Finally, the novel repair method was applied in clinic and good clinical performances have been achieved. Compared with the conventional fibular bone graft for surgical mandibular reconstruction, this study provides excellent safety and stability to accomplish the functional reconstruction and aesthetic restoration of the mandible defect. © 2021 Elsevier Ltd

Keyword :

Mastication Defects 3D printers Bone Safety factor Surgery Repair

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GB/T 7714 Kang, Jianfeng , Zhang, Jie , Zheng, Jibao et al. 3D-printed PEEK implant for mandibular defects repair - a new method [J]. | Journal of the Mechanical Behavior of Biomedical Materials , 2021 , 116 .
MLA Kang, Jianfeng et al. "3D-printed PEEK implant for mandibular defects repair - a new method" . | Journal of the Mechanical Behavior of Biomedical Materials 116 (2021) .
APA Kang, Jianfeng , Zhang, Jie , Zheng, Jibao , Wang, Ling , Li, Dichen , Liu, Shuguang . 3D-printed PEEK implant for mandibular defects repair - a new method . | Journal of the Mechanical Behavior of Biomedical Materials , 2021 , 116 .
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Interfacial Transcrystallization and Mechanical Performance of 3D-Printed Fully Recyclable Continuous Fiber Self-Reinforced Composites SCIE PubMed
期刊论文 | 2021 , 13 (18) | POLYMERS
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To fully exploit the preponderance of three-dimensional (3D)-printed, continuous, fiber-reinforced, thermoplastic composites (CFRTPCs) and self-reinforced composites (which exhibit excellent interfacial affinity and are fully recyclable), an approach in which continuous fiber self-reinforced composites (CFSRCs) can be fabricated by 3D printing is proposed. The influence of 3D-printing temperature on the mechanical performance of 3D-printed CFSRCs based on homogeneous, continuous, ultra-high-molecular-weight polyethylene (UHMWPE) fibers and high-density polyethylene (HDPE) filament, utilized as a reinforcing phase and matrix, respectively, was studied. Experimental results showed a qualitative relationship between the printing temperature and the mechanical properties. The ultimate tensile strength, as well as Young's modulus, were 300.2 MPa and 8.2 GPa, respectively. Furthermore, transcrystallization that occurred in the process of 3D printing resulted in an interface between fibers and the matrix. Finally, the recyclability of 3D-printed CFSRCs has also been demonstrated in this research for potential applications of green composites.

Keyword :

transcrystallization fully recyclable 3D printing continuous fiber self-reinforced composites mechanical properties

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GB/T 7714 Zhang, Manyu , Tian, Xiaoyong , Li, Dichen . Interfacial Transcrystallization and Mechanical Performance of 3D-Printed Fully Recyclable Continuous Fiber Self-Reinforced Composites [J]. | POLYMERS , 2021 , 13 (18) .
MLA Zhang, Manyu et al. "Interfacial Transcrystallization and Mechanical Performance of 3D-Printed Fully Recyclable Continuous Fiber Self-Reinforced Composites" . | POLYMERS 13 . 18 (2021) .
APA Zhang, Manyu , Tian, Xiaoyong , Li, Dichen . Interfacial Transcrystallization and Mechanical Performance of 3D-Printed Fully Recyclable Continuous Fiber Self-Reinforced Composites . | POLYMERS , 2021 , 13 (18) .
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Microstructure and Mechanical Properties of B-Bearing Austenitic Stainless Steel Fabricated by Laser Metal Deposition In-Situ Alloying SCIE
期刊论文 | 2021 | ACTA METALLURGICA SINICA-ENGLISH LETTERS
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In the field repair application of laser metal deposition (LMD), the kinds of powder materials that can be used are limited, while the equipment components are made of various materials. Hence many components have to be repaired with heterogeneous materials. However, it is difficult to match the mechanical properties between the repaired layer and the substrate due to the different materials. Based on the high flexibility of raw materials and processes in LMD, an in-situ alloying method is proposed herein for tailoring the mechanical properties of LMDed alloy. Using different mixing ratios of Fe314 and 316L stainless steel powders as the control parameter, the microstructure and mechanical properties of B-bearing austenitic stainless steel fabricated by LMD in-situ alloying with different proportions of Fe314 and 316L particles were studied. With the increase in the concentration of 316L steel, the volume fraction of the eutectic phase in deposited B-bearing austenitic stainless steel reduced, the size of the austenite dendrite increased, the yield strength and ultimate tensile strength decreased monotonically, while the elongation increased monotonically. Moreover, the fracture mode changed from quasi-cleavage fracture to ductile fracture. By adding 316L powder, the yield strength, tensile strength, and elongation of deposited B-bearing austenitic stainless steel could be adjusted within the range of 712 MPa-257 MPa, 1325 MPa-509 MPa, and 8.7%-59.3%, respectively. Therefore, this work provides a new method and idea for solving the performance matching problem of equipment components in the field repair.

Keyword :

Laser metal deposition In-situ alloying B-bearing austenitic stainless steel Mechanical properties Additive manufacturing

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GB/T 7714 Huang, Sheng , Zhang, Xiaoyu , Li, Dichen et al. Microstructure and Mechanical Properties of B-Bearing Austenitic Stainless Steel Fabricated by Laser Metal Deposition In-Situ Alloying [J]. | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2021 .
MLA Huang, Sheng et al. "Microstructure and Mechanical Properties of B-Bearing Austenitic Stainless Steel Fabricated by Laser Metal Deposition In-Situ Alloying" . | ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021) .
APA Huang, Sheng , Zhang, Xiaoyu , Li, Dichen , Li, Qingyu . Microstructure and Mechanical Properties of B-Bearing Austenitic Stainless Steel Fabricated by Laser Metal Deposition In-Situ Alloying . | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2021 .
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Biofabrication of a Low Modulus Bioelectroprobe for Neurons to Grow Into SCIE PubMed
期刊论文 | 2021 , 14 (16) | MATERIALS
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Implantable nerve electrodes, as a bridge between the brain and external devices, have been widely used in areas such as brain function exploration, neurological disease treatment and human-computer interaction. However, the mechanical properties mismatch between the electrode material and the brain tissue seriously affects the stability of electrode signal acquisition and the effectiveness of long-term service in vivo. In this study, a modified neuroelectrode was developed with conductive biomaterials. The electrode has good biocompatibility and a gradient microstructure suitable for cell growth. Compared with metal electrodes, bioelectrodes not only greatly reduced the elastic modulus (<10 kpa) but also increased the conductivity of the electrode by 200 times. Through acute electrophysiological analysis and a 12-week chronic in vivo experiment, the bioelectrode clearly recorded the rat's brain electrical signals, effectively avoided the generation of glial scars and induced neurons to move closer to the electrode. The new conductive biomaterial electrodes developed in this research make long-term implantation of cortical nerve electrodes possible.

Keyword :

polyaniline glial response conductive biomaterial neural electrode

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GB/T 7714 Hao, Zhiyan , Wang, Sen , Zhang, Kun et al. Biofabrication of a Low Modulus Bioelectroprobe for Neurons to Grow Into [J]. | MATERIALS , 2021 , 14 (16) .
MLA Hao, Zhiyan et al. "Biofabrication of a Low Modulus Bioelectroprobe for Neurons to Grow Into" . | MATERIALS 14 . 16 (2021) .
APA Hao, Zhiyan , Wang, Sen , Zhang, Kun , Zhou, Jiajia , Li, Dichen , He, Jiankang et al. Biofabrication of a Low Modulus Bioelectroprobe for Neurons to Grow Into . | MATERIALS , 2021 , 14 (16) .
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