Materials Science and Engineering: B最新文献_第6页

Tailoring the proportion of particle size to evaluate extrusion-based 3D printed alumina ceramics

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-24 DOI: 10.1016/j.mseb.2025.117984

Palivela Bhargav Chandan, Mamilla Ravi Sankar

{"title":"Tailoring the proportion of particle size to evaluate extrusion-based 3D printed alumina ceramics","authors":"Palivela Bhargav Chandan, Mamilla Ravi Sankar","doi":"10.1016/j.mseb.2025.117984","DOIUrl":"10.1016/j.mseb.2025.117984","url":null,"abstract":"<div><div>Extrusion-based 3D printing is a promising technology for manufacturing ceramics. The pros include the customized shaping of the ceramic parts and the economical aspects. Exploring extrusion-based ceramic 3D printing necessitates careful control of the slurry preparation with different particle sizes, printing parameters, and sintering temperatures. Altering particle sizes and printing parameters is of interest to improve the properties of the extrusion-deposited ceramic parts. The alumina particles are prepared using the combination of three different particle sizes (15 µm, 12.5 µm, and 10 µm) and sintered at the range of densification temperature for alumina. The combination of ceramics is done in the proportions of composition A (50 % 10 µm + 50 % 12.5 µm), composition B (50 % 12.5 µm + 50 % 15 µm), composition C (50 % 10 µm + 50 % 15 µm), composition D (10 µm), composition E (12.5 µm), and composition F (15 µm). The outcomes suggest that the proportionate mixing of the different particle sizes leads to 3D printing of the parts with improved characteristics.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 117984"},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The LiF doping effects on the microstructure, ferroelectric and electrocaloric properties of (Na, K, Li)(Nb, Sb, Ta)O3 −based ceramics sintered in air atmosphere and reduced atmosphere

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-23 DOI: 10.1016/j.mseb.2025.118040

Yuan-Xin Zhang , Sheng-Yuan Chu , Cheng-Che Tsai , Cheng-Shong Hong , Jian-Hao Huang , Qi-Yong Wu , Yi-An Chen

{"title":"The LiF doping effects on the microstructure, ferroelectric and electrocaloric properties of (Na, K, Li)(Nb, Sb, Ta)O3 −based ceramics sintered in air atmosphere and reduced atmosphere","authors":"Yuan-Xin Zhang , Sheng-Yuan Chu , Cheng-Che Tsai , Cheng-Shong Hong , Jian-Hao Huang , Qi-Yong Wu , Yi-An Chen","doi":"10.1016/j.mseb.2025.118040","DOIUrl":"10.1016/j.mseb.2025.118040","url":null,"abstract":"<div><div>In this study, the microstructure, electrical properties of the lead-free (Na0.52K0.4425Li0.0375)(Nb0.8925Sb0.07Ta0.0375)O3 (NKLNTS) + 2.0 mol% MnCO3 + y mol% LiF (y = 0 ∼ 3.0) ceramics sintered in air and reduced atmosphere are investigated. Both the density and grain size increase as y = 1. The samples sintered in air showed ΔT = 1.02 K of 30 kV/cm at 313 K. This is because introducing low radius Li+ ions forms an A-site substituted cell structure and changes the internal lattice stress, thus improving the polarization and electrocaloric performance. In contrast, sintered in a reduced atmosphere shows a negative effect of −0.812 K due to the enhanced polarization of defect dipoles, offsetting the decrease in maximum polarization, causing the maximum polarization to increase with increasing temperature. In addition, the observation of defect relaxation phenomena contributes to a wider operating temperature range. This is an important step towards refrigerating ferroelectric ceramics sintered in a reduced atmosphere.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118040"},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Excellent moisture barrier performance of silicon-doped diamond-like carbon coating for highly hygroscopic polymers

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-23 DOI: 10.1016/j.mseb.2025.118031

Daowei Lai , Wufang Yang , Zhengyu Liu , Rong Mu , Chunrong Tian , Guangan Zhang , Lunlin Shang , Bo Yu , Xiangfei Zhao , Chufeng Sun , Feng Zhou

{"title":"Excellent moisture barrier performance of silicon-doped diamond-like carbon coating for highly hygroscopic polymers","authors":"Daowei Lai , Wufang Yang , Zhengyu Liu , Rong Mu , Chunrong Tian , Guangan Zhang , Lunlin Shang , Bo Yu , Xiangfei Zhao , Chufeng Sun , Feng Zhou","doi":"10.1016/j.mseb.2025.118031","DOIUrl":"10.1016/j.mseb.2025.118031","url":null,"abstract":"<div><div>Numerous hydrophilic polymer films are not suitable for the deposition of inorganic coating at high temperature to enhance their moisture barrier capabilities due to the risk of deformation and degradation. To address this issue, hollow cathode plasma immersion ion implantation (HCPIII) was employed to deposit both undoped and silicon-doped diamond-like carbon (Si-DLC) coatings onto polymer substrates at temperatures close to ambient. The Si-DLC coating demonstrates significantly improved hydrophobicity, density and reduced internal stress, and superior moisture barrier performance compared to undoped DLC film. The water vapor transmission rate (WVTR) tests revealed that Si-DLC coating achieved a minimum moisture permeability of 3.3 g/m2/day, which was up to 16 times lower than that of polyurethane substrate. Additionally, Si-DLC coating showed excellent adhesive property and abrasion resistance, with no significant loss in moisture barrier even after rigorous abrasion tests. Meanwhile, the barrier performance of Si-DLC remained was almost unaffected after exposure to various corrosive liquids. To further understand the mechanism of water vapor barrier of the materials, molecular dynamics simulation and density functional theory calculations calculation were carried out to verify the number of water molecules adsorptions, adsorption energy, and interaction force between water molecules on different materials. This strategy was finally proved to be highly versatile, applicable to a wide range of hydrophilic polymer substrates, including polymer foam. Given these attributes, Si-DLC coating obtained by HCPIII is poised to offer a promising solution for enhancing the moisture barrier properties of hydrophilic polymer films that are otherwise vulnerable to high-temperature conditions.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118031"},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid functionals evaluate the n-type defects in Nb, Mo and Pt doped α-Ga2O3

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-23 DOI: 10.1016/j.mseb.2025.118033

Jinyan Chang , Liu Yang , Gongwei Hu , Shuaiwei Fan

{"title":"Hybrid functionals evaluate the n-type defects in Nb, Mo and Pt doped α-Ga2O3","authors":"Jinyan Chang , Liu Yang , Gongwei Hu , Shuaiwei Fan","doi":"10.1016/j.mseb.2025.118033","DOIUrl":"10.1016/j.mseb.2025.118033","url":null,"abstract":"<div><div>Based on the hybrid functionals calculations, the efficiency of the n-type defects Nb, Mo and Pt substituting Ga (labeled as NbGa, MoGa and PtGa) in α-Ga2O3 are fully evaluated. Obtained phonon dispersions imply the α-Ga2O3 containing NbGa, MoGa and PtGa defects keep the thermodynamic stability. The NbGa, MoGa and PtGa are typical n-type defects. The transition energy levels ε(0/+) show defects NbGa, MoGa and PtGa in α-Ga2O3 could be fully ionized. With the thermodynamic equilibrium fabrication scheme, we find NbO, MoO3 and PtO2 are the optimal dopants sources, and the minimum formation energies for defects NbGa, MoGa and PtGa are −0.66 eV, 2.56 eV and 3.21 eV. Meanwhile, MoGa (PtGa) with intrinsic defect VO is highly susceptible to form defect complex VO + MoGa (VO + PtGa). These findings would provide significant insights to the n-type defects in α-Ga2O3.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118033"},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface modification of titanium dioxide films with gallium oxide nanoparticles for enhanced photoresponse characteristics

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-23 DOI: 10.1016/j.mseb.2025.118019

O.S. Obaseki , A.B. Nasrul , F.K. Yam

{"title":"Surface modification of titanium dioxide films with gallium oxide nanoparticles for enhanced photoresponse characteristics","authors":"O.S. Obaseki , A.B. Nasrul , F.K. Yam","doi":"10.1016/j.mseb.2025.118019","DOIUrl":"10.1016/j.mseb.2025.118019","url":null,"abstract":"<div><div>Synthesis of Ga2O3-modified TiO2 films was conducted using two methods: (i) sequential electrochemical deposition followed by thermal oxidation, and (ii) simultaneous chemical vapor deposition and thermal oxidation. Morphological, optical, and structural characteristics of these composites were compared with an unmodified TiO2 sample obtained through direct thermal oxidation of titanium foil. Both modification techniques improved TiO2 properties significantly, demonstrating Ga2O3′s role in modifying TiO2 structures derived from titanium. EDX, XRD and Raman analyses confirmed the formation of TiO2-Ga2O3 composites, with TiO2 as the dominant compound, showcasing enhanced rutile TiO2 formation and improved crystalline quality. Linear sweep voltammetry measurements revealed enhanced photocurrent densities of 2.29 and 2.48 mAcm−2, respectively, compared to 1.52 mAcm−2 at 1 V bias, when used as photoanodes in a 0.5 M KOH solution. These findings suggest that Ga2O3-modified TiO2 photoanodes hold promise for solar-driven water splitting.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118019"},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An effective strategy for synthesis of spinel NiMn2O4 catalyst by a novel two-step oxidation roasting technology

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-23 DOI: 10.1016/j.mseb.2025.118043

Bing Chen , Peiyu Zhu , Lihua Gao , Zhijun He

引用次数: 0

Bifunctional Fe/Co-containing PrBaFe2-xCoxO5+δ electrode: Enhanced catalytic properties through modulating the ratio of Fe/Co cations

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-22 DOI: 10.1016/j.mseb.2025.118034

Buyun Yao, Yingnan Dou, Tian Xia, Tian Song, Qiang Li, Hui Zhao, Lihua Huo

{"title":"Bifunctional Fe/Co-containing PrBaFe2-xCoxO5+δ electrode: Enhanced catalytic properties through modulating the ratio of Fe/Co cations","authors":"Buyun Yao, Yingnan Dou, Tian Xia, Tian Song, Qiang Li, Hui Zhao, Lihua Huo","doi":"10.1016/j.mseb.2025.118034","DOIUrl":"10.1016/j.mseb.2025.118034","url":null,"abstract":"<div><div>Fe or Co-based perovskites are deemed the promising electrocatalysts in solid-state oxide cells (SSOCs). Herein, B-site Fe/Co co-occupied PrBaFe2-xCoxO5+δ perovskites are developed for catalyzing oxygen reduction/evolution reactions (ORR/OER), demonstrating considerable bifunctional performance. About all compositions, PrBaFe1.7Co0.3O5+δ (PBFC03) possesses the lowest polarization resistance (Rp) (0.085 Ω 2). This performance is reduced by ∼ 32 % than that of Co-free PrBaFe2O5+δ (PBF) (0.125 Ω 2 at 650 °C). When utilized as the cathode, the single cell delivers a maximum power density (MPD) of 1.18 W cm−2. In the electrolysis model, the current density (J) reaches ∼ 3.9 A cm−2 at 1.8 V toward CO2 reduction reaction (CORR). Combined with experimental and theoretical studies, such properties are attributed to enhanced electronic transfer and improved O2 dissociation through doping the Co ions into PBF. The results highlight the importance of active Fe/Co sites for the electrocatalysis reaction, untangling the fundamental origin of bifunctional activity.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118034"},"PeriodicalIF":3.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effect of In2+ doping in MoS2 nanosheets for rapid hydrogen production

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-21 DOI: 10.1016/j.mseb.2025.118032

Sanjay A. Bhakhar , G.K. Solanki , Shweta D. Dabhi , Trupti K. Gajaria , Pratik M. Pataniya , C.K. Sumesh

{"title":"Synergistic effect of In2+ doping in MoS2 nanosheets for rapid hydrogen production","authors":"Sanjay A. Bhakhar , G.K. Solanki , Shweta D. Dabhi , Trupti K. Gajaria , Pratik M. Pataniya , C.K. Sumesh","doi":"10.1016/j.mseb.2025.118032","DOIUrl":"10.1016/j.mseb.2025.118032","url":null,"abstract":"<div><div>The advancement of outstanding durability nanocatalysts is a major step in solving the pressing global issues of energy depletion and environmental degradation. Green hydrogen generation through the efficient water electrolysis is the strategic solution. Herein, the high yield liquid phase exfoliation approach is used to create the InxMo1-xS2 (x = 0, 0.05, 0.1) nanosheets. InxMo1-xS2 nanosheets have excellent phase purity with hexagonal crystal structure with (002) preferred orientation. In acidic water (0.5 M H2SO4), improved hydrogen evolution reaction (HER) with low overpotential of 103 mV versus RHE has been obtained by bimetal InxMo1-xS2 nanosheets based electrocatalysts because of their increased electrochemical surface area and synergistic impact. Non-noble InxMo1-xS2 electrodes demonstrate accelerated due to modified chemical environment around Mo-sites by In-doping. In-dopants increases the density of electrons around Mo-sites due to low its electronegativity, which leads to presence of additional empty d-orbitals and decreases the charge transfer resistance from 276 Ω for pristine MoS2 to 20 Ω for In0.05Mo0.95S2. For determining the optimal HER activity, Gibbs free energy calculations are carried out throughout the reaction route using density functional theory. The current study offers a more thorough understanding of how indium doping can supply catalytic active sites for improved HER performance. This research demonstrates the potential of energy saving hydrogen generation using InxMo1-xS2 nanosheets.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118032"},"PeriodicalIF":3.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of barium titanate nanocrystals decorated with PtO for enhanced photooxidative desulfurization of thiophene

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-21 DOI: 10.1016/j.mseb.2025.118028

Hind Alshaikh , Reda M. Mohamed

{"title":"Synthesis of barium titanate nanocrystals decorated with PtO for enhanced photooxidative desulfurization of thiophene","authors":"Hind Alshaikh , Reda M. Mohamed","doi":"10.1016/j.mseb.2025.118028","DOIUrl":"10.1016/j.mseb.2025.118028","url":null,"abstract":"<div><div>Perovskite titanates have emerged as promising photocatalysts for environmental remediation. One particular challenge is the removing of sulfur-containing compounds like thiophene (TPH) from fuels. Herein, we synthesized mesoporous BaTiO3 (BTO) nanostructures using a surfactant-assisted hydrothermal method and subsequently modified with varying amounts (0.5–2.0 wt%) of PtO nanoparticles (NPs) to form PtO-BTO composites. The characterization of the composite materials reveals a mesoporous structure that enhances their optical properties after adding PtO NPs. Specifically, incorporating 1.5 wt% PtO significantly reduced the bandgap energy (Eg) from 2.68 to 1.93 eV, leading to improved visible light absorption. This composite demonstrated superior photocatalytic performance, achieving complete photooxidative desulfurization of TPH during 90 min under visible light irradiation, with a remarkable oxidation rate constant of 0.035 min−1. Moreover, the photocatalyst exhibited excellent recyclability. Photoluminescence and photocurrent measurements confirmed that the introduction of PtO effectively suppressed charge carrier recombination. The proposed photoconversion mechanism involves a step-scheme charge transfer process facilitated by the heterojunction between PtO and BTO. This mechanism enables effective charge isolation and transfer, resulting in increased photocatalytic activity. This research accentuates the potential of BaTiO3-based photocatalysts for use in fuel processing and corresponding industries.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 118028"},"PeriodicalIF":3.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of diethylenetriamine pentaacetate pentasodium and guanidine phosphate on chemical mechanical polishing of TSV barrier layer

IF 3.9 3区材料科学

Materials Science and Engineering: B Pub Date : 2025-01-19 DOI: 10.1016/j.mseb.2025.117993

Xuhua Chen , Ru Wang , Zhanjie Du , Yu Zhu , Zhe Liang , Yanwei Dong , Tao Zheng

{"title":"Effect of diethylenetriamine pentaacetate pentasodium and guanidine phosphate on chemical mechanical polishing of TSV barrier layer","authors":"Xuhua Chen , Ru Wang , Zhanjie Du , Yu Zhu , Zhe Liang , Yanwei Dong , Tao Zheng","doi":"10.1016/j.mseb.2025.117993","DOIUrl":"10.1016/j.mseb.2025.117993","url":null,"abstract":"<div><div>In the process of chemical mechanical polishing (CMP) through silicon via (TSV), the chemical properties of the barrier layer material tantalum are not as active as that of the vertical interconnect material copper (Cu), which improves the material removal rate (MRR) of Ta and allows the rate selection ratio between tantalum (Ta) and Cu to be controlled. In particular, the traditional guanidine complexing agent is used to improve the MRR of Ta under alkaline conditions. The inability to suppress the MRR of excessively fast ethyl orthosilicate deposited silica layers (TEOS-SiO2) is a major challenge in this field. This paper used two complexing agents diethylenetriamine pentaacetate pentasodium (DTPA-5Na) and guanidine phosphate (GP) to solve the above technical problems effectively. Through polishing experiment and electrochemical experiment, it was found that when DTPA-5Na and GP were combined in a ratio of 1:2, the MRR of Ta, Cu, and TEOS-SiO2 were 1358 Å/min, 590 Å/min, and 1534 Å/min, respectively. The removal rate selection ratio of Ta, Cu, and TEOS-SiO2 reached 2.3:1:2.6. Subsequently, the complexation mechanism was analyzed by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and quantum chemical calculations.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering: B","volume":"314 ","pages":"Article 117993"},"PeriodicalIF":3.9,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0