AIMS Materials Science最新文献

PLA/starch biodegradable fibers obtained by the electrospinning method for micronutrient mineral release 静电纺丝法制备PLA/淀粉生物可降解纤维，用于微量营养素矿物释放

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023011

J. Malafatti, Thamara Machado de Oliveira Ruellas, C. R. Sciena, E. Paris

{"title":"PLA/starch biodegradable fibers obtained by the electrospinning method for micronutrient mineral release","authors":"J. Malafatti, Thamara Machado de Oliveira Ruellas, C. R. Sciena, E. Paris","doi":"10.3934/matersci.2023011","DOIUrl":"https://doi.org/10.3934/matersci.2023011","url":null,"abstract":"Developments in nanofibers seek to increasingly expand the field of support and release of actives, such as fertilizers. Using nanofibers as materials for mineral nutrients aims to increase the efficiency of contact release of the fertilizer to the plant root in the soil. Poly lactic acid (PLA) is a polymer with biocompatibility characteristics and spinning conditions. The starch biopolymer combined with PLA can improve the biodegradation properties and hydrophilicity of the fibers and allow the solubilization of the fertilizer source for the plant. Thus, the present paper sought to find a polymeric matrix in the form of PLA/starch nanofibers that could act in the release of the mineral micronutrient manganese as a model asset. The electrospinning method was employed to obtain the fibers varying the starch concentration from 10 to 50% (w/w) in the polymeric matrix. The nanocomposite containing manganese carbonate as a source of Mn2+ ions was produced from the best membrane composition. The results showed that the analyzed PLA/starch blends with 20% (w/w) provided better fiber affinity with water, which is fundamental for fiber degradation time. Regarding fertilizer release, the starch present in the PLA fiber at a concentration of 20% (m/m) promoted better control in the release of Mn2+. The total release occurred after 5 d in contact with the 2% citric acid extractive medium. Thus, PLA/starch fiber becomes an alternative in the packaging of particulate fertilizers, providing increased contact area during root application with gradual delivery of mineral nutrients and minimizing loss by leaching.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The performance of radar absorption of MnxFe3–xO4/rGO nanocomposites prepared from iron sand beach and coconut shell waste 研究了以铁沙滩和椰壳废料为原料制备的MnxFe3-xO4 /rGO纳米复合材料的雷达吸收性能

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023013

Yana Fajar Prakasa, S. Sumari, A. Santoso, Muhammad Roy Asrori, R. Cahyanti

{"title":"The performance of radar absorption of MnxFe3–xO4/rGO nanocomposites prepared from iron sand beach and coconut shell waste","authors":"Yana Fajar Prakasa, S. Sumari, A. Santoso, Muhammad Roy Asrori, R. Cahyanti","doi":"10.3934/matersci.2023013","DOIUrl":"https://doi.org/10.3934/matersci.2023013","url":null,"abstract":"<abstract> In this work, the Fe3O4 nanoparticles from natural iron sand were doped with Mn and combined with reduced-graphene oxide (rGO) to obtain MnxFe3–xO4/rGO nanocomposites with mole fraction variations of the Mn of 0.25, 0.5, and 0.75. The crystalline phase of the synthesized MnxFe3–xO4/rGO nanocomposites formed an amorphous phase. The presence of rGO was observed through EDX results. The magnetical properties of MnxFe3–xO4/rGO nanocomposites were shown by decreasing the Br, HcJ, Hmax along with increasing of Mn doping. Interestingly, increasing rGO and Mn composition made the absorption bandwidth of the MnxFe3–xO4/rGO nanocomposites wider, so that the radar absorption also increased marking by the greater reflection loss that reached −11.95 dB. The increase in the radar absorption performance of MnxFe3–xO4/rGO nanocomposites came from the efficient complementarity between dielectric loss and magnetic loss and interfacial polarization between Fe3O4 doped Mn and rGO. </abstract>","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of the calcination temperature of the FTO/PbS cathode on the performance of a quantum dot-sensitized solar cell FTO/PbS阴极煅烧温度对量子点敏化太阳能电池性能的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023023

H. Tung, H. Dan, Dang Huu Phuc

引用次数: 0

Energy consumption and surface roughness maps for low and moderate speed machining of Aluminum alloy 2014: An experimental study 铝合金低、中速加工能耗与表面粗糙度图2014:实验研究

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023032

U. Shaukat, S. Gohari, T. Molla

{"title":"Energy consumption and surface roughness maps for low and moderate speed machining of Aluminum alloy 2014: An experimental study","authors":"U. Shaukat, S. Gohari, T. Molla","doi":"10.3934/matersci.2023032","DOIUrl":"https://doi.org/10.3934/matersci.2023032","url":null,"abstract":"The rising energy prices and soaring environmental concerns have put an immense pressure on the wide usage of machining processes. The total power consumption during machining includes the power consumed by the machine itself and the power used to remove the material from the workpiece. An accurate prediction of energy consumption during the machining process is the basis for energy reduction. In this study, the specific cutting energy and surface finish for low and moderate-speed orthogonal machining of the aluminum alloy 2014 are evaluated. The measured values for the specific cutting energy and surface roughness are presented as maps on a grid, which is based on the machining parameters including the following: (1) cutting speed and (2) undeformed chip thickness. The specific cutting energy map depicts low energy consumption values of 0.52 J/mm3 for the aluminum alloy 2014 at medium speed machining. The roughness maps depict high roughness values at high cutting speeds. Both maps help in optimizing the machining process to achieve a required surface roughness with minimal energy consumption. A review of a specific cutting energy map demonstrates that energy consumption decreases by increasing the cutting speeds. The decrease in energy consumption at moderate speeds corresponds to the low cutting forces. This potentially happens as a result of thermal softening of the material caused by adiabatic heating. This subsequently leads to an increase in the machinability of the aluminum alloy 2014 at moderate cutting speeds. Furthermore, the decreasing chip thickness and increasing shear angle as a result of increasing the cutting speed confirms the increased machinability of the workpiece at moderate speeds.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic explanation and criterion for the exhibition of melting inability in molecular species 分子种类中不熔化性表现的热力学解释和判据

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023035

C. Tsioptsias

{"title":"Thermodynamic explanation and criterion for the exhibition of melting inability in molecular species","authors":"C. Tsioptsias","doi":"10.3934/matersci.2023035","DOIUrl":"https://doi.org/10.3934/matersci.2023035","url":null,"abstract":"Thermodynamic properties of matter e.g., melting point, are important for various applications. However, in some substances the primary observed effect upon heating is decomposition which in some cases is accompanied by fluidization. Thus, it would be very useful to be able to predict if a given substance will be able to melt or will exhibit melting inability upon heating. In this work, a thermodynamic explanation for the melting inability of molecular solids is provided and a corresponding criterion is proposed for the prediction of melting ability or inability of a given substance. One key concept is to study the strength of the weakest chemical bond rather than overall enthalpy of reaction. This arises from the fact that if decomposition occurs, then, regardless of the extent of decomposition, the transition cannot be considered to be melting. The criterion can be combined with sophisticated modeling in order to derive accurate values. Here, a simple method is proposed and an approximate index is developed which allows for a rapid and massive implementation of the criterion. The index is based on the concept of group contributions methods (estimation of the enthalpy of the maximum possible interactions, ${mathit{Delta}} H_{max }$) and on a distorted version of Trouton's rule (correlation of $ {mathit{Delta}} H_{max }$ with the heat required for melting). The correlation factor (${x}_{melting}$) was found to be equal to 40.6%. The index is successfully applied in various organic substances, including (bio)molecules of pharmaceutical/nutraceutical interest. Index values between −30 and 0 correspond to marginal cases of rather high uncertainty. Positive index values clearly point out melting inability. The proposed index successfully predicts the melting ability/inability in more than 80% of the studied substances.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating parametric homogenization models for natural frequency of FGM nano beams 研究FGM纳米光束固有频率的参数均匀化模型

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023048

Abdelhak Berkia, Billel Rebai, Bilal Litouche, Soufiane Abbas, Khelifa Mansouri

引用次数: 0

The effect of recrystallization annealing on the tungsten surface carbidization in a beam plasma discharge 再结晶退火对束流等离子放电中钨表面渗碳的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023030

M. Skakov, V. Baklanov, G. Zhanbolatova, A. Miniyazov, I. Sokolov, Yernat Kozhakhmetov, T. Tulenbergenov, Nuriya Mukhamedova, O. Bukina, A. Gradoboev

{"title":"The effect of recrystallization annealing on the tungsten surface carbidization in a beam plasma discharge","authors":"M. Skakov, V. Baklanov, G. Zhanbolatova, A. Miniyazov, I. Sokolov, Yernat Kozhakhmetov, T. Tulenbergenov, Nuriya Mukhamedova, O. Bukina, A. Gradoboev","doi":"10.3934/matersci.2023030","DOIUrl":"https://doi.org/10.3934/matersci.2023030","url":null,"abstract":"Tungsten was chosen as the plasma facing material (PFM) of the ITER divertor. However, graphite and carbon-graphite materials are used as PFM in some research thermonuclear facilities, including the Kazakhstan materials science tokamak. This circumstance determines the interest in continuing the study of the formation of mixed layers under plasma irradiation. This article is devoted to the study of the effect of preliminary recrystallization annealing on the carbidization of the tungsten surface in a beam-plasma discharge (BPD), which is one of the ways to simulate the peripheral plasma of a tokamak. Experiments on preliminary isochoric and isothermal annealing of tungsten samples were carried out in the mode of direct heating of tungsten samples by an electron beam. The carbidization of tungsten samples after annealing was carried out in a methane atmosphere in the BPD at a temperature of 1000 ℃ for a duration of 3600 s. Optical microscopy (OM) and X-ray diffraction were used to analyze the structure of the tungsten surface. It has been established that differences in the structure arising during recrystallization annealing affect the transfer of carbon atoms in the near-surface area of tungsten and the formation of tungsten carbides (WC or W2C).","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical properties of graphene nanoplatelets reinforced glass/epoxy composites manufactured using resin film infusion process 石墨烯纳米片增强玻璃/环氧复合材料的力学性能

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023038

Neeraj Wayzode, V. Suryawanshi

{"title":"Mechanical properties of graphene nanoplatelets reinforced glass/epoxy composites manufactured using resin film infusion process","authors":"Neeraj Wayzode, V. Suryawanshi","doi":"10.3934/matersci.2023038","DOIUrl":"https://doi.org/10.3934/matersci.2023038","url":null,"abstract":"Nanofillers as secondary reinforcement in polymeric composites have shown promising results on improvement of mechanical properties of the polymeric composites. However, due to the in-plane resin path, filtration of the nanofillers through fabric during processing is a major challenge in liquid infusion processes such as resin transfer molding. In resin film infusion process, the resin travels in thickness direction and due the shorter resin path, the possibility of filtration is minimal. In this study, resin film infusion (RFI) process is used to fabricate graphene platelets reinforced glass/epoxy hybrid composites. First, the resin films with 0.4 and 0.8 percent of graphene nanoplatelets (GNPs) were manufactured using solvent casting process. Then, these films were used to fabricate composites using resin film infusion process. Mechanical characterization tests, namely tensile, flexural and short beam, were performed. Tensile strength of the 0.4% and 0.8% GNPs reinforced composites was 36.13% and 22.23% higher, respectively, than that of baseline composites. Flexural strength 0.4% and 0.8% GNPs modified composites was 24.96% higher and 32% lower, respectively, compared to baseline composite. Lastly, minimal change was observed in short beam shear strength due to GNPs reinforcement. Higher void volume fraction of 1.7% and 4.5% as compared to baseline composites observed in 0.4% and 0.8% GNPs modified composites respectively.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cu-based mutlinary sulfide nanomaterials for photocatalytic applications 光催化应用的cu基多元硫化物纳米材料

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023049

Liang Wu

{"title":"Cu-based mutlinary sulfide nanomaterials for photocatalytic applications","authors":"Liang Wu","doi":"10.3934/matersci.2023049","DOIUrl":"https://doi.org/10.3934/matersci.2023049","url":null,"abstract":"<abstract> Due to their environmentally benign elemental components, suitable bandgap and high absorption coefficient in the visible-light range, Cu-based multinary sulfides exhibit excellent photocatalytic properties. Moreover, the adjustable atomic structure and unique electronic state of Cu-based multinary sulfide semiconductors can boost their ability to absorb visible light. In this review, we provide a summary of recent progress in photocatalytic applications of Cu-based multinary sulfide nanomaterials, including Cu-based ternary sulfides (CuInS2, CuIn5S8, Cu3SnS4, CuFeS2, etc.) and Cu-based quaternary sulfides (CuZnInS, Cu2ZnSnS4, CuZnGaS, CuInGaS, etc.). We start with a review of the bandgap alignments of Cu-based ternary sulfides and Cu-based quaternary sulfides, which are the key factors for the photocatalytic activity of semiconductor photocatalysts. Then, we discuss the advancements in photocatalytic applications of Cu-based multinary sulfide photocatalysts, including photocatalytic H2 production, CO2 reduction, organic synthesis and degradation of pollutants and photoelectrochemical H2 production. Finally, we end this review with a summary of the current challenges and opportunities of Cu-based multinary sulfides in future studies. </abstract>","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Possible magnetic performances of graphene-oxide and it's composites: A brief review 氧化石墨烯及其复合材料可能的磁性研究进展

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023043

Sekhar Chandra Ray

{"title":"Possible magnetic performances of graphene-oxide and it's composites: A brief review","authors":"Sekhar Chandra Ray","doi":"10.3934/matersci.2023043","DOIUrl":"https://doi.org/10.3934/matersci.2023043","url":null,"abstract":"<abstract> Carbon-based nanostructured materials are very promising for spintronic applications due to their weak spin-orbit coupling and potentially providing a long spin lifetime. Nanostructured carbons are not magnetic materials, but intrinsic magnetic behavioral nanostructure carbon materials could be fabricated through qualitative alterations. On alterations of carbon nanostructured materials, it changes their critical temperature and magneto-crystalline anisotropy energy that could be useful as favorable magnetic materials for different magnetic/electromagnetic device-based applications. Different processes are used for the alteration of nanostructure carbon materials like chemical doping, introducing defects, changing the density of states, functionalization, intercalation, forming heterostructure and fabricating nanocomposites layered semiconductor materials. Among the carbon-based derived nanostructured materials, the graphene oxide (GO) gets attracted towards the magnet forming in the spin-like structure across the area of the magnet. Due to its magnetic behaviour, it is used for the adsorption of metals and radionuclides and to make nonconductive oxide-metal. In this review article, the basics of magnetic behavioral change of the carbon-based GO/GO-nanocomposites nanostructured materials are described by gathering information from the literature that were/are reported by different researchers/research groups worldwide. </abstract>","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0