Applied Surface Science最新文献

{"title":"Polyamide powder coatings with superior flowability for antibacterial application via microwave-driven spheroidization and in-situ self-assembly of AgNPs","authors":"Jiayuan Yang ,&nbsp;Yingchun Liu ,&nbsp;Wanchun Lin ,&nbsp;Yage Zhou ,&nbsp;Bo-Mei Liu ,&nbsp;Wei Liu ,&nbsp;Maoping Lyu ,&nbsp;Jesse Zhu ,&nbsp;Hui Zhang","doi":"10.1016/j.apsusc.2025.164772","DOIUrl":"10.1016/j.apsusc.2025.164772","url":null,"abstract":"<div><div>Since environmental pollution and bacterial infections seriously threaten human health, considerable attention is devoted to designing antibacterial powder coatings. Silver nanoparticles (AgNPs) in the antibacterial coatings are recognized widely yet have not been well developed for powder coatings due to the size, carriers, dispersity and Ag⁺ release of AgNPs. Herein, polyamide-based (PA) powder coating is prepared by microwave-driven spheroidization of PA particles and in-situ self-assembly of AgNPs based on polydopamine as active sites. PA particles with a sphericity of 0.93 show near perfect round morphology. It is conducive to decreasing the particle interactions, such as van der Waals and electrostatic forces, compared to irregular ones, thereby exhibiting superior flowability. Owing to AgNPs with a size of 75 ± 3 nm in coatings showed adaptable Ag⁺ release rate, superior dispersity and interface compatibility. The coatings thus present durable antibacterial properties and wear resistance. Results demonstrated that the coatings containing 1.0 wt% AgNPs exhibited 99.99 % reduction for <em>E. coli</em> and <em>S. aureus</em>. Moreover, it is against presenting the same activity as the original coatings after 500 rub cycles or immersion for 7 days. Finally, as-prepared powder coating was used in door handles and wheelchair hand rims, proving its potential usefulness in public health devices.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"717 ","pages":"Article 164772"},"PeriodicalIF":6.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ formation of WO3/WS2 heterojunction for an efficient and stable NO abatement under visible light","authors":"Haoyu Wang,&nbsp;Zijian Du,&nbsp;Hengrui Wang,&nbsp;Haoran Zhao,&nbsp;Yuming Sun,&nbsp;Jiupai Ni,&nbsp;Chengsheng Ni","doi":"10.1016/j.apsusc.2025.164752","DOIUrl":"10.1016/j.apsusc.2025.164752","url":null,"abstract":"<div><div>Tungsten trioxide (WO₃) with a suitable bandgap for environmental photocatalysis exhibits susceptibility to photocorrosion/photochromism stemming from the instability of W⁶⁺, which undergoes reduction to lower valence states. To achieve a stable photocatalytic NO abatement, a heterostructure comprising nano-sized tungsten disulfide (WS₂) dots on WO₃ planar sheets was synthesized <em>via</em> a single-step calcination of WS₂ at different temperatures. Charge transfer at the WS₂/WO₃ interface suppresses the photocorrosion of WO₃ during the photocatalytic NO abatement. The optimized WS₂/WO₃ heterostructure demonstrated an NO removal efficiency that is 2.5 times higher than that of pristine WO₃ and exhibited robust stability during cyclic tests. WS₂ alone displayed negligible photocatalytic activity toward NO oxidation, but WS₂ facilitated the electron diversion on WO₃ <em>via</em> a S-scheme mechanism, minimizing the reduction of W⁶⁺. The reactive oxygen species (ROS) generated on WS₂ has to initiate the oxidation of NO that is activated at the WS₂/WO₃ interface. This study elucidates a promising methodology for constructing heterostructure with an intimate interfacial contact and an optimized charge transfer for the efficient oxidation of NO under the ambient atmosphere.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"717 ","pages":"Article 164752"},"PeriodicalIF":6.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ce doping-boosted lattice oxygen activation for NiCo2O4 in acidic oxygen evolution reaction","authors":"Yahui Li ,&nbsp;Haolin Cheng ,&nbsp;Jinli Zhang ,&nbsp;Yan Fu","doi":"10.1016/j.apsusc.2025.164784","DOIUrl":"10.1016/j.apsusc.2025.164784","url":null,"abstract":"<div><div>Developing low-cost non-noble electrocatalysts is crucial for acidic oxygen evolution reaction (OER); however, their performance still lags behind that of Ir-based catalysts. Herein, Ce-doped NiCo₂O₄ electrocatalysts were synthesized on carbon cloth (CC) by electrodeposition and subsequent calcination. The Ce doping effectively modulated the electronic redistribution of NiCo₂O₄, and Ce acted as a dynamic electron buffer to inhibit excessive oxidation of Co species during OER. The optimal 10 %Ce-NiCo₂O₄ exhibited an overpotential of 220 mV at 10 mA cm⁻² and maintained outstanding durability over 120 h, significantly outperforming undoped NiCo₂O₄ (353 mV; 40 h). Theoretical calculations and experimental results unraveled that Ce doping efficiently activated lattice oxygen oxidation and decreased the energy barrier of the rate-determining step, thereby favoring the involvement of the lattice oxygen oxidation mechanism (LOM) in 10 %Ce-NiCo₂O₄ during acidic OER. This work develops a promising strategy for constructing cost-effective electrocatalysts with high activity and stability in acidic OER.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"717 ","pages":"Article 164784"},"PeriodicalIF":6.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phytic acid-mediated construction of hollow metal-organic framework nanorods with dual amidoxime and phosphate functionalities for uranium adsorption","authors":"Chuyao Liang ,&nbsp;Weifeng Hou ,&nbsp;Yi Li ,&nbsp;Cuicui Shao ,&nbsp;Yuxin Sun ,&nbsp;Wei Xu ,&nbsp;Shuyang Cao ,&nbsp;Daobin Zhang ,&nbsp;Shouzhi Pu ,&nbsp;Zhijian Li","doi":"10.1016/j.apsusc.2025.164769","DOIUrl":"10.1016/j.apsusc.2025.164769","url":null,"abstract":"<div><div>Metal organic frameworks (MOFs) has aroused mounting attention in the field of uranium extraction from seawater. However, the attainment of high adsorption efficiency persists as a daunting challenge. Reasonable optimization of the pore morphology and structure of MOFs, along with precise grafting of multi-affinity sites, is pivotal for enhancing adsorption performance. Herein, we employed a synchronous synthesis strategy involving phytic acid (PA) − mediated hollowing and functionalization to optimize pore structure and functional sites simultaneously for H-MIL-AO@PA3. PA showed selective etching of the MIL-AO core layer, and we also optimized the reaction time to control structure evolution. H-MIL-AO@PA3 features a unique “dual-functional group − hollow pore channel” system, which enables highly efficient uranium adsorption (Q_m = 406.50 mg g^-¹) according to the Langmuir model. Moreover, H-MIL-AO@PA3 demonstrates high selectivity (K_d &gt; 4.2 × 10⁵ mL g^-¹) and excellent reusability over five adsorption/desorption cycles for uranium. The adsorption process of H-MIL-AO@PA3 is in excellent agreement with the pseudo-second-order model, and equilibrium is attained within 30 min (C₀ = 20 mg L^-1). This work provides a new approach for the design of high-performance of adsorbents for uranium extraction from seawater.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"717 ","pages":"Article 164769"},"PeriodicalIF":6.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atmospheric pressure plasma surface treatment to enhance interfacial insulation and water resistance of PP/SIR composite insulation","authors":"Xi Zhu, Tianhe Lu, Xiuhan Guan, Zhenbin Tian, Hongtu Cheng, Zhi Fang","doi":"10.1016/j.apsusc.2025.164790","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.164790","url":null,"abstract":"Layered polypropylene/silicon rubber (PP/SIR) composites have been widely used as reinforced insulation in electrical equipment. However, PP/SIR interface in composites is susceptible to electrical and moisture corrosion, severely affecting the stability of electrical equipment. In this study, an interface enhancement method for PP/SIR is developed based on atmospheric pressure plasma surface modification. Through controlling reaction conditions, Ar and Ar/hexamethyldisiloxane (HMDSO) plasma are established to provide reactive species such as Ar* and Si-containing fragments, which could etch or deposit SiO_3∼4 film on PP and SIR surfaces. The plasma treatment increases surface roughness and introduces polar oxygen-containing groups, while the film deposition fabricates hydrophobic surfaces, as well as shallows the surface trap to inhibit charge accumulation. The modified surfaces are configured in pairs to form PP/SIR interface for interface performance optimization. It is demonstrated that plasma etching promotes interface breakdown voltage of PP/SIR by 97.3 %, but the etched interface suffers from moisture invasion. By contrast, plasma film deposition blocks moisture penetration in PP/SIR interface, and synchronously contributes to the highest improvement of interface breakdown voltage (increased by 137.3 %). The facile plasma strategy could tailor multiple performances of surfaces and interfaces, which is of great significance for advanced dry-type modification in emerging applications.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"2 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of ultrasonic surface rolling treatment and shot peening on surface microstructure and corrosion behavior of CuNiSi alloy","authors":"Hou Yao, Kebin Sun, Zhaolin Chen, Rui Feng, Xinde Zhu, Fan Zhang, Yujie Lin, Xiaowen Wang","doi":"10.1016/j.apsusc.2025.164776","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.164776","url":null,"abstract":"Due to excellent strength and conductivity, CuNiSi alloy is widely used in high-speed railway contact network and other fields. However, owing to the complex application environment, CuNiSi alloy often experiences corrosion failure. Based on this, the surface of CuNiSi alloy was treated by ultrasonic surface rolling treatment (USRT) and shot peening (SP) process, and the nanocrystalline layer was successfully prepared on the alloy surface. Meanwhile, the microstructure, hardness and residual stress of surface layer was characterized. The results show that USRT and SP process does not change the phase composition of alloy surface, but introduce a large number of deformation twins and dislocations on the surface, resulting in significant grain refinement. USRT and SP samples exhibit enhanced surface hardness and residual compressive stress compared to the untreated sample. The electrochemical test results reveal that USRT and SP samples exhibit significantly enhanced corrosion resistance in 3.5 wt% NaCl solution, which can be attributed to the stable oxidation film introduced by the high density of grain boundaries and residual compressive stress.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"163 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon material containing M-N-C active site derived from metallocorrole complex and ZIF-8 as OER/ORR bifunctional electrocatalyst for zinc-air batteries","authors":"Xin-Yi Huang, Yan-Fang Yao, Kun Fang, Liang-Hong Liu, Fu-Rong Wang, Li-Ping Si, Hai-Yang Liu","doi":"10.1016/j.apsusc.2025.164767","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.164767","url":null,"abstract":"With superior oxygen reduction reaction (ORR) catalytic properties, M-N-C catalysts represent a viable low-cost alternative to commercial Pt/C electrocatalysts in energy storage devices. Herein, the unique M-N_x coordination structure in metallocorrole (M = Fe, Mn, Co) was innovatively utilized as the precursor for active M-N-C sites, which was loaded onto ZIF-8-derived porous carbon framework to synthesize a series of MCor@Z-C bifunctional electrocatalysts. The metallocorrole provides highly stable M-N_x active centers, while the ZIF-8-derived 3D porous carbon framework constructs effective transfer channels. The prepared MCor@Z-Cs showed good catalytic activity in both electrocatalytic ORR and OER. Of which, FeCor@Z-C exhibits the best performance, achieving a half-wave potential of 0.91 V (<em>vs.</em> RHE), surpassing that of the commercial Pt/C catalyst (0.85 V (<em>vs.</em> RHE)). Moreover, it demonstrates a low oxygen evolution reaction (OER) overpotential of merely 270 mV at a current density of 10 mA cm⁻². The zinc-air battery fabricated using FeCor@Z-C exhibits a power density of 100.8 mW cm⁻² and a specific capacity of 750 mAh g⁻¹.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"20 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlled synthesis of Ni3S2 nanostructures on nickel foam for improved HER catalytic performance","authors":"Kroy Sophanna, Jayanta Mondal, Anush Mnoyan, Weon Gyu Shin","doi":"10.1016/j.apsusc.2025.164771","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.164771","url":null,"abstract":"Developing<!-- --> <!-- -->effective, noble metal-free electrocatalysts to improve the slow kinetics of the hydrogen evolution reaction (HER) has garnered significant interest in water electrolysis. In this study, we introduce a one-step, in-situ hydrothermal strategy for precisely fabricating trinickel disulfide (Ni₃S₂) nanostructures epitaxially grown on nickel foam (NF). Physical characterization revealed that Ni₃S₂@NF exhibited a range of porous structures, increasing surface area. Additionally, it showed that the quantity of hydrazine hydrate (HZH) plays a crucial role in the reduction and sulfurization processes during Ni₃S₂ formation on NF, optimizing its catalytic efficiency for HER. The flower-like, porous Ni₃S₂ clusters provide a variety of catalytically active sites. Due to its uniform and porous morphology, the electrode synthesized with 5 mL HZH (Ni₃S₂@NF/5mL-HZH) exhibited the highest electrochemical surface area (ECSA) and optimal catalytic performance. This result in the lowest overpotential (46.8 mV at 10 <!-- --> <!-- -->mA·cm^–2), charge transfer resistance (Rct = 2.74 Ω), and HER kinetics (Tafel slope: 62.3 mV·dec^–1), surpassing previously reported Ni₃S₂-based HER catalysts. Furthermore, prolonged durability testing exhibited a slight current decline after 48 h of continuous operation. This study highlights the significant influence of ZHZ concentration on the morphology and electrochemical properties of Ni₃S₂@NF, emphasizing its potential as a promising candidate for sustainable hydrogen production in energy applications.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"61 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing microbially influenced corrosion of titanium as novel canister material for geological disposal facilities","authors":"Adam D. Mumford, Marcos F. Martinez-Moreno, Mar Morales-Hidalgo, Cristina Povedano-Priego, Lidia Generelo-Casajus, Fadwa Jroundi, Lorna Anguilano, Uchechukwu Onwukwe, Philip H.E. Gardiner, Mohamed L. Merroun, Yon Ju-Nam, Jesus J. Ojeda","doi":"10.1016/j.apsusc.2025.164779","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.164779","url":null,"abstract":"In response to the growing global inventory of nuclear waste and the urgent need for secure long-term disposal solutions, geological disposal facilities (GDFs), also known as deep geological repositories, are being pursued worldwide. Several national programmes, including those in the UK, Japan, and Canada, are evaluating corrosion-resistant alloys for waste canisters. Among these, novel materials such as titanium alloys have emerged as promising candidates due to their protective TiO₂ films. However, the threat of microbial corrosion under repository-relevant conditions remains highly unexplored. To address this, titanium discs (grade 2, ASTM B348) were incubated in bentonite slurries with synthetic pore-water at 30 °C and 60 °C under strictly anoxic, dark conditions, mimicking deep underground GDF environments. Electron donors (acetate, lactate) and an electron acceptor (sulphate) were added to stimulate microbial activity and assess long-term canister performance. All titanium samples retained an intact TiO₂ layer with no detectable pitting or localised damage. Microscopic (SEM) and spectroscopic (XPS) analyses showed slight thinning of titanium oxide films and microbial presence co-located with bentonite, but no evidence of corrosion products or metal loss. Micro-FTIR showed functional groups associated with microbial presence (proteins, lipids, and polysaccharides) in the bentonite, but not on titanium surfaces. The experimental design aimed to promote bacterial activity to simulate worst-case GDF biotic conditions.These findings demonstrate titanium’s exceptional stability against microbially influenced corrosion (MIC) in stimulated GDF-like environments. This study supports the structural viability of titanium canisters for nuclear waste disposal and underscores the importance of considering microbial factors in long-term corrosion assessments.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"24 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of modulation structure on microstructure, mechanical and tribological properties of NiCrMoAl/Al multilayer composite films","authors":"Shuying Chen ,&nbsp;Jianfei Xu ,&nbsp;Hao Huang ,&nbsp;Hailong Fan ,&nbsp;Cunxin Pan ,&nbsp;Haichao Zhao","doi":"10.1016/j.apsusc.2025.164760","DOIUrl":"10.1016/j.apsusc.2025.164760","url":null,"abstract":"<div><div>Rigid films with multilayer or gradient structures have been widely used in machining applications, where their modulation structure plays a crucial role. In this study, magnetron sputtering was used to prepare thin films with different modulation structures on ZL109 aluminium alloy, and their microstructures, compositional states, mechanical properties and tribological behaviors were systematically analyzed by various characterization methods, and the wear mechanism was deeply understood from the atomic scale with the help of molecular dynamics simulation. The results show that the films exhibit uniform nanoparticle-like, clear multilayer columnar crystal structure with uniform compositional distribution. The modulation structure significantly affects the film properties. When the modulation layer count is 4 layers and the modulation ratio is 8:1, the film hardness and elastic modulus reach their maximum values of 13.67 and 259.4 GPa, respectively. The bond strength is optimal at 17 N, the average coefficient of friction is lowest at 0.28, and wear resistance is most favorable. The primary wear mechanism of the film is abrasive wear. By varying the load for friction and wear tests, it was found that as the load increased, the film friction coefficient showed a tendency to increase first and then stabilize at high loads, and the width and depth of the wear marks gradually increased. The molecular dynamics simulation results show that the higher the indentation depth, the higher the average friction coefficient and the more intense the fluctuation; meanwhile, the increase in the indentation depth leads to an increase in the accumulation of atoms on the surface of the thin film, an intensification of the topography change, an expansion and deepening of the high shear strain region, an increase in the number of wear atoms, and A gradual decrease in dislocation density.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"717 ","pages":"Article 164760"},"PeriodicalIF":6.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}