14 results on '"Yunchao Li"'
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2. Phosphorus-induced electronic structure reformation of hollow NiCo2Se4 nanoneedle arrays enabling highly efficient and durable hydrogen evolution in all-pH media
- Author
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Guojing Wang, Yuzhuo Sun, Yidan Zhao, Yang Zhang, Xiaohong Li, Louzhen Fan, and Yunchao Li
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General Materials Science ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics - Published
- 2022
3. Myoblast-derived exosomal Prrx2 attenuates osteoporosis via transcriptional regulation of lncRNA-MIR22HG to activate Hippo pathway
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Yunchao Li, Xiaoxiao Wang, Changyu Pan, Hui Yuan, Xinyi Li, Zejun Chen, and Haoyu He
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Genetics ,Molecular Medicine ,Molecular Biology ,Genetics (clinical) - Abstract
Background Sarcopenia and osteoporosis are common diseases that predominantly affect older individuals. The interaction between muscle and skeleton exerts pivotal roles in bone remodeling. This study aimed to explore the function of myoblast-derived exosomal Prrx2 in osteogenic differentiation and its potential mechanisms. Methods Exosomes were isolated from myogenic differentiated C2C12 cells. qRT-PCR and Western blotting were used to determine target molecule expression. Osteogenic differentiation of BMSCs was evaluated by Alizarin red staining, ALP activity and levels of OCN, OPN, RUNX2, and BMP2. Dual-luciferase reporter assay, RIP, and ChIP assays were performed to verify the interaction between molecules. The nuclear translocation of YAP1 was observed by immunofluorescence staining. In vivo osteoporotic model was established by ovariectomy in mice. Bone loss was examined using HE staining. Results Prrx2 expression was elevated in myogenic differentiated C2C12 cells and their exosomes. Myoblast-derived exosomal Prrx2 enhanced osteogenic differentiation of BMSCs. Delivering exosomal Prrx2 directly bond to MIR22HG promoter and promoted its transcription and expression. MIR22HG enhanced expression and nuclear translocation of YAP via sponging miR-128, thus facilitating BMSC osteogenic differentiation. Knockdown of exosomal Prrx2 suppressed osteogenic differentiation, which could be abolished by MIR22HG overexpression. Similarly, miR-128 inhibitor or YAP overexpression reversed the inhibitory effect of MIR22HG depletion or miR-128 mimics on osteogenic differentiation. Finally, myoblast-derived exosomal Prrx2 alleviated osteoporosis in mice via up-regulating MIR22HG and activating the Hippo pathway. Conclusion Myoblast-derived exosomal Prrx2 contributes to transcriptional activation of MIR22HG to activate YAP pathway via sponging miR-128, thereby facilitating osteogenic differentiation of BMSCs.
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- 2023
4. Applications of Machine Learning to Predict the Chord Length Distribution of Droplets in Oil–Water Dispersions
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Yunchao Li, Daqian Liu, and Lu Liu
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General Engineering ,General Materials Science - Published
- 2022
5. Predictive model of global tilt (GT) determined by individual thoracic kyphosis, lumbar lordosis and pelvic incidence in the human degenerative spine
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Guodong Wang, Lei Kuang, Jianmin Sun, Guohua Lv, Changyu Pan, and Yunchao Li
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Adult ,Pelvic tilt ,Lumbar Vertebrae ,business.industry ,Posture ,Pelvic incidence ,Thoracic kyphosis ,Sagittal plane ,Radiography ,medicine.anatomical_structure ,Tilt (optics) ,Lordosis ,medicine ,Humans ,Sagittal alignment ,Orthopedics and Sports Medicine ,Surgery ,In patient ,Kyphosis ,Lumbar lordosis ,business ,Nuclear medicine ,Aged - Abstract
Previous studies only investigated the simple linear relationships of global tilt (GT) with thoracic kyphosis (TK), lumbar lordosis (LL) and pelvic incidence (PI). This study aimed to establish multiple linear regressions of GT based on individual TK, LL and PI in patients with degenerative spines. Four hundred sixty-nine adult patients aged older than 35 years with various degenerative spinal diseases were enrolled in this two-centre study between January 2017 and December 2020. Full-spine X-rays were performed for all the subjects in a standing position. The following regional and global parameters were measured in the sagittal plane: TK, LL, PI, pelvic tilt (PT), sagittal vertical axis (SVA) and GT. The correlations of the GT, PT and SVA with the TK, LL and PI were analysed, and then multiple linear regressions were constructed. GT was statistically correlated with TK, LL and PI. Additionally, TK, LL and PI were significant predictors for the GT, PT and SVA models. The relevant predictive formulae were as follows: GT = -9.60 + 1.09*PI + 0.89*LL + 0.42*TK (R2 = 0.935), PT = -4.49 + 0.81*PI + 0.56*LL + 0.24*TK (R2 = 0.792) and SVA = -25.68 + 2.98*LL + 2.37*PI + 1.67*TK (R2 = 0.416). The specific sagittal spinopelvic morphology, evaluated by GT parameters, should be determined by individual TK, LL and PI values in the degenerative spine. Surgeons can utilize such predictive models to better understand the degenerative evolution of sagittal alignment and recognize the relationships between regional parameters and global sagittal alignment to customize a precise correction strategy.
- Published
- 2021
6. Author Correction: Targeted tumour theranostics in mice via carbon quantum dots structurally mimicking large amino acids
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Shuhua Li, Wen Su, Hao Wu, Ting Yuan, Chang Yuan, Jun Liu, Gang Deng, Xingchun Gao, Zeming Chen, Youmei Bao, Fanglong Yuan, Shixin Zhou, Hongwei Tan, Yunchao Li, Xiaohong Li, Louzhen Fan, Jia Zhu, Ann T. Chen, Fuyao Liu, Yu Zhou, Miao Li, Xingchen Zhai, and Jiangbing Zhou
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Biomedical Engineering ,Medicine (miscellaneous) ,Bioengineering ,Computer Science Applications ,Biotechnology - Published
- 2022
7. Highly efficient and stable white LEDs based on pure red narrow bandwidth emission triangular carbon quantum dots for wide-color gamut backlight displays
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Fanglong Yuan, Xiaohong Li, Haizheng Zhong, Yunchao Li, Louzhen Fan, Ping He, Shihe Yang, and Zifan Xi
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Materials science ,Photoluminescence ,business.industry ,02 engineering and technology ,Backlight ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,law.invention ,Full width at half maximum ,Gamut ,Quantum dot ,law ,Optoelectronics ,General Materials Science ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Electrical efficiency ,Light-emitting diode ,Diode - Abstract
High-performance white light-emitting diodes (WLEDs) hold great potential for the next-generation backlight display applications. However, achieving highly efficient and stable WLEDs with wide-color-gamut has remained a formidable goal. Reported here is the first example of pure red narrow bandwidth emission triangular CQDs (PR-NBE-T-CQDs) with photoluminescence peaking at 610 nm. The PR-NBE-T-CQDs synthesized from resorcinol show high quantum yield (QY) of 72% with small full width at half maximum of 33 nm. By simply controlling the reaction time, pure green (PG-) NBE-T-CQDs with high QY of 75% were also obtained. Highly efficient and stable WLEDs with wide-color-gamut based on PR- and PG-NBE-T-CQDs was achieved. This WLED showed a remarkable wide-color gamut of 110% NTSC and high power efficiency of 86.5 lumens per Watt. Furthermore, such WLEDs demonstrate outstanding stability. This work will set the stage for developing highly efficient, low cost and environment-friendly WLEDs based on CQDs for the next-generation wide-color gamut backlight displays.
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- 2019
8. Precursor reactivity differentiation for single-step preparation of Ag2Se@Ag2S core–shell nanocrystals with distinct absorption and emission properties enabling sensitive near-infrared photodetection
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Cai Wenhao, Shilin Tang, Chuansheng He, Dong Li, Louzhen Fan, and Yunchao Li
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Materials science ,Mechanical Engineering ,Quantum yield ,02 engineering and technology ,Photodetection ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Nanomaterials ,Full width at half maximum ,Nanocrystal ,Mechanics of Materials ,General Materials Science ,Reactivity (chemistry) ,0210 nano-technology ,Absorption (electromagnetic radiation) - Abstract
To obtain dual active near-infrared (NIR) nanomaterial with strong absorption and emission properties, we report herein a novel precursor reactivity differentiation strategy, i.e., utilizing 1-octadecene (ODE)–Se having the ability to react with Ag salts much stronger and faster than ODE–thiourea, for single-step preparation of Ag2Se@Ag2S nanocrystals (NCs). With this strategy, we were able to synthesize high-quality Ag2Se@Ag2S NCs with both excellent NIR absorption and emission properties. Particularly, these nanocrystals possess a rather strong and sharp excitonic absorption peak with a full width at half maximum less than 70 nm and a maximum fluorescence quantum yield as high as 24.3%. Their appealing optical properties and structural features were founded to be highly dependent on the Se to S precursor ratio in the reaction solutions, owing to such a ratio exerting a direct influence on the core sizes and shell thicknesses of the as-formed NCs. Taking advantage of their remarkable NIR absorption properties, self-powered photoelectrochemical-type photodetectors based on the as-prepared Ag2Se@Ag2S NCs were successfully fabricated, which demonstrate a much better response performance and photostability in comparison with those based on Ag2Se NCs.
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- 2018
9. Carbon/tin oxide composite electrodes for improved lithium-ion batteries
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Amit K. Naskar, M. Parans Paranthaman, Richard J. Lee, Alan M. Levine, Sheng Dai, Yunchao Li, and Jinshui Zhang
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Battery (electricity) ,Materials science ,General Chemical Engineering ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Tin oxide ,01 natural sciences ,0104 chemical sciences ,Anode ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Materials Chemistry ,Electrochemistry ,Lithium ,0210 nano-technology ,Tin ,Carbon ,Ball mill - Abstract
Tin and tin oxide-based electrodes are promising high-capacity anodes for lithium-ion batteries. However, poor capacity retention is the major issue with these materials due to the large volumetric expansion that occurs when lithium is alloyed with tin during lithiation and delithiation process. Here, a method to prepare a low-cost, scalable carbon and tin(II) oxide composite anode is reported. The composite material was prepared by ball milling of carbon recovered from used tire powders with 25 wt% tin(II) oxide to form lithium-ion battery anode. With the impact of energy from the ball milling, tin oxide powders were uniformly distributed inside the pores of waste-tire-derived carbon. During lithiation and delithiation, the carbon matrix can effectively absorb the volume expansion caused by tin, thereby minimizing pulverization and capacity fade of the electrodes. The as-synthesized anode yielded a capacity of 690 mAh g−1 after 300 cycles at a current density of 40 mA g−1 with a stable battery performance. A method to prepare low-cost carbon/tin (II) oxide (SnO) composite by ball milling is reported. SnO powders are uniformly distributed inside the carbon matrix, which could effectively absorb the volume expansion of Sn and alleviate capacity fade. The anode yields a capacity of 690 mAh g−1 after 300 cycles.
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- 2018
10. Erratum to: Highly efficient and stable white LEDs based on pure red narrow bandwidth emission triangular carbon quantum dots for wide-color gamut backlight displays
- Author
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Fanglong Yuan, Ping He, Zifan Xi, Xiaohong Li, Yunchao Li, Haizheng Zhong, Louzhen Fan, and Shihe Yang
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General Materials Science ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics - Published
- 2020
11. Controlled calcination of ZnSe and ZnTe nanospheres to prepare visible-light catalysts with enhanced photostability and photoactivity
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Wanting Yang, Xiaohong Li, Xiaoli Liu, Yunchao Li, Dong Li, Shilin Tang, and Louzhen Fan
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Materials science ,Mechanical Engineering ,Nanotechnology ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Catalysis ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Mechanics of Materials ,law ,Photocatalysis ,General Materials Science ,Calcination ,Irradiation ,0210 nano-technology ,Absorption (electromagnetic radiation) ,Methylene blue ,Visible spectrum - Abstract
To obtain cheap, low-toxic, efficient and robust visible-light photocatalyst, a controlled calcination strategy is proposed for converting unstable ZnX (X=Se, Te) nanospheres (NSs) to ZnX–ZnO hybrid nanospheres (HNSs) with an appropriate composition and structure. Under such a conception, ZnSe–ZnO HNSs with various compositions were prepared by calcining ZnSe NSs under different conditions. Their morphology, composition, crystal structure, and optical absorption property were found to be highly dependent on their calcination condition. When serving as the catalyst for photodegrading organic dyes, they exhibited an attractive composition/structure-dependent photocatalytic activity and enhanced photostability. Particularly, the HNSs prepared by calcining at 500 °C for 4.0 h demonstrated the highest photocatalytic activity and excellent photostability, only taking 4.5 and 5.5 h to degrade 97.3 % methylene blue (MB) and 93 % ethyl violet (EV), respectively, under visible irradiation. The reason why such HNSs possessed the best photocatalytic performance was then intensively explored from different points of view. Moreover, we also extended this calcination protocol to prepare ZnTe–ZnO HNSs, whose photocatalytic performance was proven to be much better than that of pure ZnTe NSs as expected. We believe the strategy for fabricating such hybrid nanospheres and the exploration on their excellent photocatalytic performance will definitely benefit the preparation of high-efficient visible-light catalyst as well as the better understanding of its composition/structure-dependent photocatalytic activity.
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- 2016
12. Synthesis and characterization of substituted garnet and perovskite-based lithium-ion conducting solid electrolytes
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Ayyakkannu Manivannan, M. Parans Paranthaman, Dominique E. Williams, Chetan Dhital, Karim Zaghib, Yunchao Li, Maria Abreu-Sepulveda, and Ashfia Huq
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Materials science ,General Chemical Engineering ,Inorganic chemistry ,General Engineering ,Analytical chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Arrhenius plot ,0104 chemical sciences ,law.invention ,chemistry ,law ,Impurity ,Phase (matter) ,Ionic conductivity ,General Materials Science ,Calcination ,Lithium ,0210 nano-technology ,Perovskite (structure) ,Monoclinic crystal system - Abstract
Titanium, tantalum-substituted Li7La3Zr2-xAxO12 (LLZO, A = Ta, Ti) garnets, and chromium-substituted La(2/3)-xLi3xTi1-yCryO3 (LLTO) perovskites were prepared by a conventional solid-state reaction and the Pechini processes. The desired crystal phases were obtained by varying the calcination temperature and time, as well as the substitution concentration. All samples indicated decomposition of the precursors when heated above 750 °C and formation of the desired phase after heat treatment at higher temperatures. Neutron diffraction data shows the formation of a predominant cubic phase in the case of Ta-LLZO, and monoclinic phase with minor impurity phases for Cr-LLTO. Ionic conductivity for Ti-LLZO (Li7La3Zr1.4Ti0.6O12), Ta-LLZO (Li6.03La3Zr1.533Ta0.46O12), and Cr-LLTO (La(2/3)-xLi3xTi0.9Cr0.1O3) at room temperature were found to be 5.21 × 10−6, 1.01 × 10−6, and 1.2 × 10−4 S cm−1, respectively. The activation energies of the compounds were determined from the Arrhenius plot and were 0.44 eV (Ti0.6-LLZO), 0.54 eV (Ta0.5-LLZO), and 0.20 eV (Cr0.1-LLTO).
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- 2015
13. Conduction below 100 °C in nominal Li6ZnNb4O14
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Lance W. Gill, Yunchao Li, Arumugam Manthiram, Yangyang Wang, Gabriel M. Veith, Alexei P. Sokolov, Miaofang Chi, Edward W. Hagaman, Cheng Ma, Mariappan Parans Paranthaman, Sheng Dai, and John B. Goodenough
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Battery (electricity) ,Materials science ,Mechanical Engineering ,Analytical chemistry ,02 engineering and technology ,Electrolyte ,Conductivity ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Thermal conduction ,01 natural sciences ,Spectral line ,0104 chemical sciences ,Adsorption ,Mechanics of Materials ,Particle ,General Materials Science ,0210 nano-technology ,Porosity - Abstract
The increasing demand for a safe rechargeable battery with a high energy density per cell is driving a search for a novel solid electrolyte with a high Li+ or Na+ conductivity that is chemically stable in a working Li-ion or Na-ion battery. Li6ZnNb4O14 (LZNO) has been reported to exhibit a σ Li > 10−2 S cm−1 at 250 °C, but to disproportionate into multiple phases on cooling from 850 °C to room-temperature. An investigation of the room-temperature Li-ion conductivity in a porous pellet of a multiphase product of a nominal LZNO composition is shown to have bulk σ Li ≈ 3.3 × 10−5 S cm−1 at room-temperature that increases to 1.4 × 10−4 S cm−1 by 50 °C. 7Li MAS NMR spectra were fitted to two Lorentzian lines, one of which showed a dramatic increase with increasing temperature. A test for water stability indicates that Li+ may move to the particle and grain surfaces to react with adsorbed water as occurs in the garnet Li+ conductors.
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- 2015
14. Electrochemical repairing of pitted 18-8 stainless steel
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Chuanwei Yan, H. P. Duan, and Yunchao Li
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Materials science ,Passivation ,Mechanical Engineering ,Metallurgy ,engineering.material ,Dielectric spectroscopy ,Corrosion ,X-ray photoelectron spectroscopy ,Chemical engineering ,Mechanics of Materials ,Electrode ,Pitting corrosion ,engineering ,General Materials Science ,Austenitic stainless steel ,Polarization (electrochemistry) - Abstract
In order to clarify the reaction essential of electrochemical repairing method, which was developed to repair the passive film on pits and suppress pitting corrosion on passive 18-8 stainless steel (18-8ss) after occurrence of pitting, the electrochemical characteristics, morphology and composition of passive film after different treatments were investigated by electrochemical impedance spectroscopy (EIS), Cyclic Voltammogram (CV), Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The dynamic behavior of reactions occurred at lower potential (E L = −200 mV) and higher potential (E H = 1000 mV) of alternating electric filed was discussed respectively and the correlation between those reactions was analyzed. Based on above results, reaction essence of electrochemical repairing for pitted 18-8ss electrode was proposed: during the periodic action of alternating current, recycle reactions take place on the surface and the pit area of pitted electrode, i.e., metal dissolves into cations (occurs at E L and form hydrous hydroxide, the hydrous hydroxide turns into metal oxide (occurs at E H), a ‘bipolar mode’ passive film forms and Cr content is increased in repaired passive film. At the pit area, enclosed state of the pit is destroyed by the perturbing effect of alternating current in 1.0 M H2S04 solution, thus the pit area will be repaired through above-mentioned process.
- Published
- 2005
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