9 results on '"Pei-Jie Lu"'
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2. Ultrathin Li3VO4 nanoribbon/graphene sandwich-like nanostructures with ultrahigh lithium ion storage properties
- Author
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Jun Liu, Pei-Jie Lu, Shuquan Liang, Wenjun Wang, Ming Lei, Shasha Tang, and Qian Yang
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Materials science ,Nanostructure ,Renewable Energy, Sustainability and the Environment ,Graphene ,Layer by layer ,Layered double hydroxides ,Oxide ,chemistry.chemical_element ,Nanotechnology ,engineering.material ,law.invention ,chemistry.chemical_compound ,Template ,chemistry ,law ,engineering ,General Materials Science ,Lithium ,Electrical and Electronic Engineering ,Ternary operation - Abstract
Two-dimensional (2D) “graphene-like” inorganic materials, because of the short lithium ion diffusion path and unique 2D carrier pathways, become a new research focus of the lithium storages. Some “graphene-like” binary compounds, such as, MnO2, MoS2 and VO2 ultrathin nanosheets, have been synthesized by the peeling method, which also exhibit enhanced lithium storage performances. However, it still remains a great challenge to synthesize widely-used lithium-containing ternary oxides with “graphene-like” nanostructures, because the lithium-containing ternary oxides, unlike ternary layered double hydroxides (LDH), are very hard to be directly peeled. Herein, we successfully synthesized ultrathin Li3VO4 nanoribbons with a thickness of about 3 nm by transformation from ultrathin V2O5·xH2O nanoribbons, moreover, we achieved the preparation of ultrathin Li3VO4 nanoribbon@graphene sandwich-like nanostructures (LVO/G) through the layer-by-layer assembly method. The unique sandwich-like nanostructures shows not only a high specific reversible capacitance (up to 452.5 mA h g−1 after 200 cycles) but also an excellent cycling performance (with more than 299.2 mA h g−1 of the capacity at 10C after 1000 cycles) as well as very high rate capability. Such template strategy, using “graphene-like” binary inorganic nanosheets as templates to synthesize lithium-containing ternary oxide nanosheets, may be extended to prepare other ternary oxides with “graphene-like” nanostructures.
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- 2015
3. Ti2AlC/TiC Functionally Graded Material Fabricated by SPS
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Ming Yan, Zong Yu Li, Xi Ya Zhu, Pei Jie Lu, Yan Lin Chen, and Cheng Wen Zeng
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Materials science ,Microscope ,Fabrication ,law ,Vickers hardness test ,Spark plasma sintering ,General Medicine ,Composite material ,Raw material ,Spectroscopy ,Layer (electronics) ,Functionally graded material ,law.invention - Abstract
Ti/Al/TiC mixed powders were used as the raw materials for the fabrication of functionally graded material (FGM) in situ synthesis by spark plasma sintering. The sample was analyzed by SEM combined with Metallographic microscope and Energy Disperse Spectroscopy. The results show that dense Ti2AlC/TiC functionally graded material (FGM) was produced by spark plasma sintering. Micro-hardness tester is used to character the distribution of hardness on the material .The results show that the Vickers hardness of every layer increases with TiC content and temperature increasing.
- Published
- 2014
4. Ti2AlC/TiC Functionally Graded Material Fabricated by Reaction Sintering
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Pei Jie Lu, Ming Yan, Zong Yu Li, Yan Lin Chen, and Cheng Wen Zeng
- Subjects
Thermal shock ,Microscope ,Fabrication ,Materials science ,law ,Vickers hardness test ,General Engineering ,Sintering ,Composite material ,Hot pressing ,Functionally graded material ,Layer (electronics) ,law.invention - Abstract
Ti/Al/TiC mixed powders were used as the raw materials for the fabrication of functionally graded material (FGM) by hot pressing sintering. The sample was analyzed by SEM combined with Metallographic microscope and Energy Disperse Spectroscopy,The results show that each layer is composed of TiC and Ti2AlC, without containing other phases. The size of TiC grains are about 3-6 μm. With TiC content in the layers increasing, Ti2AlC grains gradually decrease. The lathy Ti2AlC grains of the FGM have a length of about 10 μm and a width of about 4 μm. The interface of each layer has a good combination with a certain thickness transition layer.Microhardness tester is used to analyse the hardness of material.The results show that the Vickers hardness of every layer increases with TiC content increasing. The thermal shock performance test found that material has good thermal shock performance.
- Published
- 2013
5. Long-term efficacy and safety of bone cement-augmented pedicle screw fixation for stage III Kümmell disease
- Author
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Guo-ye Mo, Teng-peng Zhou, Hui-zhi Guo, Yong-xian Li, Yong-chao Tang, Dan-qing Guo, Pei-jie Luo, Dong-xiao Li, Kai Yuan, Ling Mo, and Shun-cong Zhang
- Subjects
Medicine ,Science - Abstract
Abstract This study aimed to evaluate the efficacy and safety of bone cement-augmented pedicle screw fixation for stage III Kümmell disease. Twenty-five patients with stage III Kümmell disease who received bone cement-augmented pedicle screw fixation at the First Affiliated Hospital of Guangzhou University of Chinese Medicine between June 2009 and December 2015 were enrolled. All patients were females with a history of osteoporosis. The vertebral Cobb angle (V-Cobb angle), the fixed segment Cobb Angle (S-Cobb angle), pelvic parameters, visual Analogue Scale (VAS) score, and Oswestry Disability Index (ODI) were assessed preoperatively, postoperatively and at the final follow-up. Complications, loosening rate, operation time, and intraoperative bleeding were recorded. The average lumbar vertebral density T-value was − 3.68 ± 0.71 SD, and the average age was 71.84 ± 5.39. The V-Cobb angle, S-Cobb angle, and Sagittal Vertical Axis (SVA) were significantly smaller postoperatively compared to the preoperative values. The VAS and ODI at 1 month after surgery were 3.60 ± 1.00 and 36.04 ± 6.12%, respectively, which were both significantly lower than before surgery (VAS: 8.56 ± 1.04, ODI: 77.80 ± 6.57%). Bone cement-augmented pedicle screw fixation is a safe and effective treatment for stage III Kümmell disease. It can effectively correct kyphosis, restore and maintain sagittal balance, and maintain spinal stability.
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- 2021
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6. Effect and potential risks of using multilevel cement-augmented pedicle screw fixation in osteoporotic spine with lumbar degenerative disease
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Yong-chao Tang, Hui-zhi Guo, Dan-qing Guo, Pei-jie Luo, Yong-xian Li, Guo-ye Mo, Yan-huai Ma, Jian-cheng Peng, De Liang, and Shun-cong Zhang
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Multilevel fixation ,Cement-augmented pedicle screw instrumentation ,Lumbar degenerative disease ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Background The increase of augmented level and bone cement dose are accompanied by the rising incidence of cement leakage (CL) of cement-augmented pedicle screw instrumentation (CAPSI). But the effect and potential risks of the application of CAPSI to osteoporotic lumbar degenerative disease (LDD) have not been studied in the case of multilevel fixation. This study aimed to investigate the effectiveness and potential complications of using multilevel CAPSI for patients with osteoporotic LDD. Methods A total of 93 patients with multilevel LDD were divided into the CAPSI group (46 subjects) and the conventional pedicle screw (CPS) group (47 subjects), including 75 cases for three levels and 18 cases for four levels. Relevant data were compared between two groups, including baseline data, clinical results, and complications. Results In the CAPSI group, a total of 336 augmented screws was placed bilaterally. The CL was observed in 116 screws (34.52%). Three cemented screws (0.89%) were found loosened during the follow-up and the overall fusion rate was 93.47%. For perioperative complications, two patients (4.35%) experienced pulmonary cement embolism (PCE), one patient augmented vertebral fracture, and three patients (6.52%) wound infection. And in the CPS group, thirty-three screws (8.46%) suffered loosening in cranial and caudal vertebra with a fusion rate of 91.49%. The operation time and hospital stay of CAPSI group were longer than the CPS group, but CAPSI group has a lower screw loosening percentage (P
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- 2020
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7. Novel Surgical Strategy for Treating Osteoporotic Vertebral Fractures with Cord Compression
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Dan‐qing Guo, Miao Yu, Shun‐cong Zhang, Yong‐chao Tang, Yun Tian, Da‐xing Li, Guo‐ye Mo, Yong‐xian Li, Hui‐zhi Guo, Pei‐jie Luo, Teng‐peng Zhou, Yan‐huai Ma, Yusupov Abdukodir, Pan‐jie Liu, and De Liang
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Spinal Cord Compression ,CT Scan ,Osteoporotic fracture ,Surgery ,Orthopedic surgery ,RD701-811 - Abstract
Objectives Treatment for osteoporotic vertebral fracture (OVF) with cord compression is challenging and it usually requires surgical interventions to decompress nerves and restore spinal sequences. To describe a novel surgical strategy for treating OVFs with cord compression. Methods This is a single‐center retrospective analysis. The inclusion criteria were Frankel grade C‐E, single level T10‐L2. Between January 2008 and December 2016, a total of 56 OVF patients (47 females and nine males, with an average age of 72 years (66–88 years), comprising of eight grade C, 23 grade D, and 25 grade E patients) were enrolled. The treatment algorithm included preoperative evaluation by MRI, extension CT, and radiography to classify the OVFs as type 1.1 (reducible, stable; n = 13), type1.2 (reducible, unstable; n = 16), type 2 (irreducible; n = 19) or type 2M (modifier; n = 8). Vertebroplasty (VP)/kyphoplasty (KP) was applied in type 1.1. VP/KP with posterior fixation and posterolateral fusion was applied in type 1.2. And additional laminectomy/osteotomy was used in type 2, except in a modifier group (2M) where same procedure as applied for type 1.2 was used. VAS, ODI, Cobb angle, Frankel functional grade, and complications were recorded. Results Thirteen cases were classified as type 1.1, 16 cases as type 1.2, 19 cases as type 2, and eight cases as type 2M. The follow‐up period was 38.9 months (range, 24–108 months). All patients were followed‐up in at least 24 months, in which time four patients died, two patients were lost at the last follow‐up, and 50 patients completed the full study. The total VAS and ODI improved from 8 (7, 9) and 75.5% (67.2%, 80.0%) preoperatively to 2 (1, 3) and 31% (24.0%, 37.0%) on conclusion, respectively (P
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- 2019
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8. Augmented pedicle trajectory applied on the osteoporotic spine with lumbar degenerative disease: mid-term outcome
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Guo-ye Mo, Hui-zhi Guo, Dan-qing Guo, Yong-chao Tang, Yong-xian Li, Kai Yuan, Pei-jie Luo, Ten-peng Zhou, Shun-cong Zhang, and De Liang
- Subjects
Lumbar degenerative diseases ,Osteoporosis ,Cement-augmented ,Pedicle screw ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Abstract Purpose To compare the safety and efficiency of cement-augmented pedicle screw with traditional pedicle screw technique applied on the patients in the osteoporotic spine with lumbar degenerative diseases. Methods Fifty-six patients followed up at least 2 years were enrolled in our institute with retrospectively reviewed from January 2009 to June 2014, diagnosed as lumbar spondylolisthesis, or lumbar stenosis, with T score ≤− 2.5 SD of BMD, and received less than three-segment PLIF or TLIF. All patients were divided into 2 groups: 28 (2 males, 26 females) in polymethylmethacrylate-augmented pedicle screw group (PSA) group, the other 28 (3 males, 25 females) in traditional pedicle screw group (TPS). Surgical data including the operation time, intra-operative blood loss, hospitalization day and surgical complications were recorded, as well as the radiological parameters measured from the postoperative X-rays and CT scans containing the rates of fusion, screw loosening, and cage subsidence incidence. In addition, the visual analog scores (VAS) and Oswestry Disability Index (ODI) were evaluated preoperatively and postoperatively. Results The average follow-up period was 34.32 months (ranging from 24 months to 51 months). Compared with PSA group, operation time and average hospital stay in the TPS group decreased significantly (P < 0.05). While no statistical difference for blood loss between 2 groups (P > 0.05). At 2 years postoperation, from CT-scans, 2/172 screws loosening and 1/56 segment non-union occurred in PSA group, with significantly lower incidence than those in TPS group (8/152 screws loosening and 6/50 segments non-union occurred, P < 0.05). Regarding the cage subsidence, 24 segments found height loss (5.30 ± 1.92 mm) in PSA group without difference compared with that of 19 segments (4.78 ± 1.37 mm) in TPS group (P > 0.05). Besides, the number and the location of cages and the leakage of the cement were found out little related with the subsidence in the PSA group (P > 0.05). After surgeries, VAS and ODI at 1 month, 6 months, 12 months, and last follow-up improved significantly in two groups (P < 0.05). There were no significant differences in VAS and ODI preoperatively and postoperatively between 2 groups (P > 0.05). In addition, eight patients with asymptomatic trajectory PMMA leakages were detected. Conclusion Cement-augmented pedicle screw technique is effective and safe in the osteoporotic spine with lumbar degenerative diseases, with better fusion rates and less screw loosening incidence. There is no difference in the fusion rate and loosening rate between the two groups in the single segment patients; however, there are better fusion rate and lower pedicle screw loosening rate of the PSA group in the double or multiple group patients.
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- 2019
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9. Graphene nanosheets encapsulated a-MoO3 nanoribbons with ultrahigh lithium ion storage properties.
- Author
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Pei-Jie Lu, Ming Lei, and Jun Liu
- Subjects
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GRAPHENE , *NANORIBBONS , *LITHIUM , *GRAPHENE oxide - Abstract
A facile and effective method has been reported to synthesize graphene-encapsulated α-MoO3 nanoribbons by a self-assembly process between negatively charged graphene oxide and positively charged MoO3 nanoribbons. Compared to the structures of MoO3 nanobelts grown on graphene or other hybrids of MoO3 composited with carbon or non-carbon, this unique hybrid architecture of the grapheneencapsulated MoO3 nanoribbons exhibits not only a high specific capacity (up to 823 mAh g-1 after 70 cycles at 200 mA g-1), but also an excellent cycling performance (with more than 754 mAh g-1 after 200 cycles at 1000 mA g-1 ) as well as a greatly-enhanced high-rate capability (displaying a high discharge capacity of 710 mAh g-1 after 30 cycles at 3000 mA g-1), thus showing great potential as an anode material for lithium ion batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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