Next Materials最新文献

{"title":"Fabrication of ZnO nanoparticles using marula (Sclerocarya birrea) leaf extract for catalytic degradation of rhodamine 6 G and methylene blue dyes under UV light irradiation","authors":"Tsholofelo Khao ,&nbsp;Robert O. Gembo ,&nbsp;Sebusi Odisitse ,&nbsp;Cecil K. King'ondu","doi":"10.1016/j.nxmate.2024.100366","DOIUrl":"10.1016/j.nxmate.2024.100366","url":null,"abstract":"<div><p>This study investigated the synthesis of zinc oxide nanoparticles (ZnO NPs) using marula leaf extract. Boiling water was used to extract the active marula ingredients, which were then processed hydrothermally with zinc precursor to synthesize ZnO NPs. Under UV light irradiation, the produced ZnO NPs were used to simultaneously degrade two dyes: methylene blue (MB) and rhodamine 6 G (R6G) in a binary dye mixture. The XRD analysis showed that pure and crystalline structures of ZnO NPs were fully formed after calcination at 350 ℃. Raman spectroscopy was employed to determine the materials’ molecular functional groups using the fingerprint regions on the spectra. The distinctive peaks at 318, 429, and 566 cm⁻¹ were used to identify ZnO NPs. SEM showed that ZnO NPs had both sphere-like and agglomerated nanorod structures and BET analysis showed that the ZnO materials had a an average pore size of 2818.35 (Å) with a pore volume of 0.008846 cm³/g and a surface area of 21.29 ± 0.07 m²/g. CT350-ZnO NPs afforded simultaneous MB and R6G degradation efficiencies of 99 and 98 %, respectively, after a time interval of 75 min. The degradation efficiency increased with the catalyst amount, contact time, and reaction temperature and decreased as the original concentration was raised. This study shows that ZnO NPs have a great deal of promise for environmental and public health protection because of their high effectiveness in degrading binary dye combinations when exposed to UV light.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100366"},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002636/pdfft?md5=9a0604fa13b8da125448fc32b63c88b0&pid=1-s2.0-S2949822824002636-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancements and challenges in Si-based solid-state batteries: From anode design to manufacturing processes","authors":"Abdul Jabbar Khan ,&nbsp;Ling Gao ,&nbsp;Yi Zhang ,&nbsp;Qili Su ,&nbsp;Zhe Li ,&nbsp;Yong Lu ,&nbsp;Haijing Liu ,&nbsp;Guowei Zhao","doi":"10.1016/j.nxmate.2024.100371","DOIUrl":"10.1016/j.nxmate.2024.100371","url":null,"abstract":"<div><p>Silicon-based solid-state batteries (Si-SSBs) are now a leading trend in energy storage technology, offering greater energy density and enhanced safety than traditional lithium-ion batteries. This review addresses the complex challenges and recent progress in Si-SSBs, with a focus on Si anodes and battery manufacturing methods. It critically analyzes the lithiation process in Si anodes, emphasizing the significant volumetric expansion and evolving solid-electrolyte interphase (SEI), both of which are crucial for the electrochemical performance and durability of batteries. Innovations in anode design, such as morphological optimization and compositional alloying, have been explored to reduce mechanical stress and improve the electrochemical properties. Moreover, we elaborate in detail the essential steps in the layer-by-layer construction and encapsulation of Si-SSBs, which are vital for their stability and function. Finally, this review offers a thorough examination of present scientific and technological developments, providing insights and prospective pathways for researchers and industry professionals dedicated to advancing SSB technology.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100371"},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002685/pdfft?md5=ca38952bf24781c30027ae073efaf2b2&pid=1-s2.0-S2949822824002685-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing polymer electrolytes with carbon nanotube fillers: A promising frontier","authors":"M.S.M. Misenan ,&nbsp;M.S. Ahmad Farabi ,&nbsp;Z.N. Akhlisah ,&nbsp;A.S.A. Khiar","doi":"10.1016/j.nxmate.2024.100365","DOIUrl":"10.1016/j.nxmate.2024.100365","url":null,"abstract":"<div><p>This review is about carbon nanotubes (CNTs) as fillers in conductive polymer electrolyte. In the beginning of the review, brief information regarding energy storage has been provided. A polymer-based membrane is used in the polymer electrolyte, which may need filler or functionalization to improve device performance. Fillers are additives that can reduce production costs while also enhancing a composite's surface morphology and a polymer's mechanical strength. Due to their superior chemical, mechanical, electrical, thermal, and structural capabilities, carbon nanotubes (CNTs) are commonly utilized as fillers or additions for conductive composites. CNTs exhibit good interfacial compatibility with the host polymer matrix in addition to being mechanically robust. The synthesis method of CNTs including laser vaporization, electric arc discharge technique and chemical deposition has been discussed. This review offers succinct information to the researcher who insists on enhancing the polymer electrolyte employing these prospective fillers, described with necessary values of characteristics measurement. Based on recent investigations, it also includes the unique characteristics of the CNT nanofillers about their chemical structure and electrochemical capabilities.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100365"},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002624/pdfft?md5=d096ee080a9e3b5b39a3c129ecdfeeed&pid=1-s2.0-S2949822824002624-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First principal study of conduction mechanism of Mg doped BaCoO2.6 nanoparticles","authors":"Fareenpoornima R ,&nbsp;S. Deborah ,&nbsp;G. Parthipan","doi":"10.1016/j.nxmate.2024.100369","DOIUrl":"10.1016/j.nxmate.2024.100369","url":null,"abstract":"<div><p>In this study, Mg-doped BaCoO_2.6 (Ba_1-xMg_xCoO_2.6) (x = 0.1 – 0.4) compounds were synthesized via Sol-gel method and their frequency and temperature-depended electrical properties were investigated in the temperature range <span><math><mrow><mn>37</mn><mo>°</mo><mi>C</mi></mrow></math></span>–<span><math><mrow><mn>200</mn><mo>°</mo><mi>C</mi></mrow></math></span> using an impedance analyzer. Structural and chemical analysis of Mg-doped BaCoO_2.6 were carried out via scanning electron microscope (SEM-EDAX) and Fourier transform infrared spectroscopy (FTIR). The imaginary part of impedance as a function of frequency shows Debye-like relaxation. Impedance data is presented in the Nyquist plot, and the argand diagram with the grain, grain-boundary, and electrode contributions is estimated. The activation energies for the ac conductivity decrease with the frequency rise. The shifting of modulus peaks to low-frequency region suggests long-range motion and the presence of two peaks at 473 K to both long and short-range motion with more than one relaxation time. Our research being the first to report on dielectric studies, we suggest the sample’s use as serial nano-capacitors and in optical, microwave devices.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100369"},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002661/pdfft?md5=bfe1b03cb31577e233bd78ad144c4ceb&pid=1-s2.0-S2949822824002661-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2D chalcogenide heterostructures: A discussion on its synthesis, properties and emerging applications","authors":"S. Supriya,&nbsp;S. Senapati,&nbsp;R. Naik","doi":"10.1016/j.nxmate.2024.100368","DOIUrl":"10.1016/j.nxmate.2024.100368","url":null,"abstract":"<div><p>Owing to the notable physical characteristics and the technological progressive applications, atomically thin 2D metal chalcogenides have fascinated the enhancing attention in recent times. Several interesting findings for these 2D materials have given away new phases, structures, and optical and electronic properties by numerous experimental methods. The probability of exfoliating and rebuilding various 2D materials into unsystematically and vertically stacked heterostructures is empowered by van der Waals interlayer interaction. Again, in search of new catalysts, intense investigation has been induced by the unique structural and electronic properties of the 2D materials. In the case of electrochemical reactions, the fabrication of various heterostructures based on 2D materials extends great opportunities for promoting catalytic activity. However, it has become a great challenge for the synthesis of the materials. For the direct synthesis of the vertical and lateral heterojunctions, vapor phase growth of the 2D material has been opened the way. It has become a structured way to recognize high-quality, large-scale, 2D materials, chemical vapor deposition (CVD) has been brought forward lately, which has exhibited great feasibility in 2D metal chalcogenide heterostructures. This review highlights the heterostructure types, synthesis methods, various properties, and applications of the materials. In the synthesis of heterostructures, methods such as hydrothermal, solvothermal, microwave-assisted heating, and other processes are discussed. The growth mechanism of the synthesis method has also been elaborated here. Various properties and applications of the materials have taken an important part of the review. The advantages of the properties like optoelectronic, thermal, electrical, etc, with various potential applications are explored. Finally, the application of the materials in various fields, such as photodetection, solar cells, and catalysis, is highlighted.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100368"},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S294982282400265X/pdfft?md5=ef2fde2bcf62be99c52d34751ee0c664&pid=1-s2.0-S294982282400265X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication and thermomechanical property investigations of polypropylene/silica and polypropylene/modified silica composite films","authors":"Özkan Demirbas ,&nbsp;Hasan Cetin ,&nbsp;Mehmet Salih NAS ,&nbsp;Mehmet Harbi Calimli ,&nbsp;Ramazan Bayat ,&nbsp;Fatih Sen","doi":"10.1016/j.nxmate.2024.100357","DOIUrl":"10.1016/j.nxmate.2024.100357","url":null,"abstract":"<div><p>In this study, we fabricated polypropylene/silica (PP/S) and polypropylene/modified silica (PP/MS) composite films using the extrusion technique, and characterized, and investigated their thermomechanical behaviors. The characterization of the neat materials and prepared composites was successfully conducted using some advanced spectroscopic techniques. The thermal stability and thermomechanical behaviors of the composites were investigated through thermogravimetry analysis (TGA) and dynamic mechanical analysis (DMA). The tensile tests revealed that the PP/MS composites exhibited the highest strength values, reaching 22.23 MPa with 1.0 % MS. Higher tensile strength was obtained with PP/MS composites compared to PP/S composites, proving the clear effect of the hexadecyltrimethylammonium bromide (HTAB) binder in the composition of the composites. The highest strength values obtained with the PP/S composites were 20.10 MPa at a ratio of 2.5 %.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100357"},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002545/pdfft?md5=299828b05c79d9967a1c49b433361d42&pid=1-s2.0-S2949822824002545-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in applications of merocyanine dye as sensitizers in solar cells","authors":"Arvind Kumar,&nbsp;Ishana Kathuria,&nbsp;Satish Kumar","doi":"10.1016/j.nxmate.2024.100352","DOIUrl":"10.1016/j.nxmate.2024.100352","url":null,"abstract":"<div><p>Solar cells based on a dye as a sensitizer have compelling importance in the field of energy conversion. New developments in this rapidly expanding area are continuously appearing in literature based on dye as a sensitizer for the new type of solar cells with improved efficiency. Therefore, the current review is focused on a different aspect of solar cells and studies to evaluate their efficiencies in harvesting solar energy. The review summarizes stepwise advancements in the solar cell with a merocyanine as sensitizer from the point of origin to the current status. Various attempts to improve the efficiency of solar cells using merocyanine derivatives as sensitizers including the use of natural as well as synthetic dyes and their different substitutes have been discussed. Besides, review have also included the use of nanomaterials with merocyanine dyes to improve the efficiency of solar cells. So here, we have summarized all types of solar cell parameters and their role in energy conversion.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100352"},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002491/pdfft?md5=d6a49a607d081e7729334778d3eed2ee&pid=1-s2.0-S2949822824002491-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CALPHAD approach for prediction of local phase transformation at superlattice stacking fault in gamma prime precipitates in superalloys with multi-component system","authors":"Takuma Saito ,&nbsp;Hiroshi Harada ,&nbsp;Taichi Abe ,&nbsp;Hideyuki Murakami","doi":"10.1016/j.nxmate.2024.100363","DOIUrl":"10.1016/j.nxmate.2024.100363","url":null,"abstract":"<div><p>This manuscript investigated the possibility of CALPHAD (calculation of phase diagram) approach to predict the local phase transformation (LPT) accompanied by compositional transition on the superlattice stacking fault in the γ′ precipitates in multi-component superalloys. The method is basically parallel tangent construction using the concept of the LPT phase in the system of γ and γ′ phases to approximate the atomic structure of the stacking fault. Because the important issue for the strengthening by the LPT is whether the LPT phase is ordered or disordered, the ordering was judged by the size of the stacking fault energy to form the LPT phase from γ′ precipitates. In addition, since the solute partitioning ratio between LPT phase and γ′ precipitates is also significant to consider the LPT, the predicted ratio was verified using the experimental results in the previous reports. In the case of SISF (superlattice intrinsic stacking fault), Co-base superalloys tend to form ordered <span><math><mi>χ</mi></math></span> LPT phase, but formability of ordered <span><math><mi>χ</mi></math></span> and disordered <span><math><mi>ε</mi></math></span> LPT phases in Ni-base superalloys is calculated to be competitive. The predicted solute partitioning rate almost agrees with the experimental one except for Nb in multi-component superalloys. This discrepancy could originate from the accuracy of the physical properties of Ti and Nb in the database of <span><math><mi>χ</mi></math></span> LPT phase. In the case of SESF (superlattice extrinsic stacking fault), all considered alloys of Ni-base superalloys were predicted to have ordered <span><math><mi>η</mi></math></span> LPT phase, judged by stacking fault energy, however, the predicted solute partitioning ratio was different from the experimental ones. This issue could originate from inaccurate physical properties between Ti and Ta in the database of <span><math><mi>η</mi></math></span> LPT phase with the multi-component system.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100363"},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002600/pdfft?md5=1b5c47a47e106213865479cab587909f&pid=1-s2.0-S2949822824002600-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron-based metal-organic frameworks and their derivatives for high-performance supercapacitors","authors":"Chun Liu ,&nbsp;Wei Gong ,&nbsp;Tayyaba Iftikhar ,&nbsp;Wenjun Liu ,&nbsp;Lei Su ,&nbsp;Xueji Zhang","doi":"10.1016/j.nxmate.2024.100362","DOIUrl":"10.1016/j.nxmate.2024.100362","url":null,"abstract":"<div><p>As energy demand continues to rise, electrochemical energy storage has garnered substantial attention. Supercapacitors, renowned for their high power density and long cycle life, have been extensively studied as complementary devices to batteries. Iron-based metal-organic frameworks (Fe-MOFs) and their derivatives have emerged as promising candidates for supercapacitor anode materials due to their abundant pore structures and redox sites. This review offers a comprehensive summary of recent research on Fe-MOFs and their derivatives as supercapacitor electrode. It introduces the synthesis and physical and electrochemical properties of Fe-MOFs, and delves into their energy storage mechanisms, with a focus on their application in supercapacitors. It encompasses Fe-MOFs, Fe-MOF derivatives, iron-based bimetallic MOFs, and composite materials derived from Fe-MOFs. Additionally, it briefly explores the use of other metal MOFs in supercapacitors. The design and utilization of Fe-MOF and its derivatives as electrode materials are discussed, including the impact of carbonization on their performance and their interaction with aqueous electrolytes. This review concludes with a summary and outlook on Fe-MOFs and their derivatives as supercapacitor electrode, aiming to provide valuable insights and guidance for future research in this field.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100362"},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002594/pdfft?md5=c1b49e23055a8c5a439ae90c2e914e4a&pid=1-s2.0-S2949822824002594-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling NbSe2 single crystal: First principle insights, optical properties, synthesis and X-ray diffraction profile investigation","authors":"Mehul S. Dave ,&nbsp;Ranjan Kr. Giri ,&nbsp;Rajiv D. Vaidya ,&nbsp;Kaushik R. Patel ,&nbsp;Shivani R. Bharucha ,&nbsp;Mitesh B. Solanki","doi":"10.1016/j.nxmate.2024.100361","DOIUrl":"10.1016/j.nxmate.2024.100361","url":null,"abstract":"<div><p>Niobium diselenide (NbSe₂) crystals were synthesized using the chemical vapour transport (CVT) technique. The Generalized Gradient Approximation (GGA) method was used in the density functional theory (DFT) calculation. The Perdew-Burke-Ernzerhof (PBE) pseudopotential function was utilised to emphasise the structural, electrical, elastic constant, and optical characteristics of the hexagonal P6₃/mmc symmetric structured crystalline phase of NbSe₂. Additionally, the density of states (DOS) revealed that, at the Fermi level, the Nb (3d) states predominated, with the Se (5p) and Se (5 s) states playing a minor role. The band structure confirmed the crystal's metallic nature, which showed an overlap between the conduction and valence bands. Scherrer method, Williamson-Hall (WH) analysis, Size-Strain Plot (SSP), and Halder-Wagner (HW) plot utilising uniform deformation model (UDM), uniform stress deformation model (USDM), and uniform deformation energy density model (UDEDM) models were used to investigate the X-ray diffraction (XRD) profile. The crystallite size, inherent stress, strain, and energy density parameters were estimated. Optical microscopy and transmission electron microscopy (TEM) had both been used to study surface morphology.</p></div>","PeriodicalId":100958,"journal":{"name":"Next Materials","volume":"7 ","pages":"Article 100361"},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949822824002582/pdfft?md5=3f27839ebcc56808cc60ad46be3241a9&pid=1-s2.0-S2949822824002582-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}