Emerging Materials Research最新文献_第5页

Characteristics of Abelmoschus Esculentus (Indian okra) fiber varieties 印度秋葵纤维品种的特性研究

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00230

Prafull P. Kolte, V. Shivankar

{"title":"Characteristics of Abelmoschus Esculentus (Indian okra) fiber varieties","authors":"Prafull P. Kolte, V. Shivankar","doi":"10.1680/jemmr.22.00230","DOIUrl":"https://doi.org/10.1680/jemmr.22.00230","url":null,"abstract":"Okra fiber is the natural cellulosic bast fiber extracted from the bark of the Abelmoschus esculentus plant stem. India is the largest producer of okra for the cultivation of “okra fruit.” After harvesting the okra plant in the field, the okra fruit is collected as a vegetable, and the okra plant is thrown out as agricultural waste. In India, an estimated 4.5 million tons of green okra plants were discarded annually as agricultural waste. The okra plant has the potential to produce 150–160 kg of okra fibers per hectare and about 13.4 million kg of okra fibers annually. The okra plant is cultivated in two seasons: summer and winter. The summer variety (SV) and winter variety (WV) were extracted from okra plants cultivated in the summer and winter seasons, respectively. In this study, characteristics of the summer and winter varieties of okra fibers (morphological, thermal, and structural) are investigated by optical and electron microscopy (SEM), thermogravimetric analysis (TGA, DTG, DSC), X-ray diffraction analysis (XRD), and Fourier transform infrared spectrometry (FTIR). This study analyzed the characteristics of both varieties of okra fiber, compared them, and proved their potential for commercial applications like banana, jute, flax, hemp, and kenaf bast fibers.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49174521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 4

Development and evaluation of coalmine waste materials for gainful utilisation 煤矿废弃材料的开发与评价

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00185

S. Choudhury, M. Mishra

{"title":"Development and evaluation of coalmine waste materials for gainful utilisation","authors":"S. Choudhury, M. Mishra","doi":"10.1680/jemmr.22.00185","DOIUrl":"https://doi.org/10.1680/jemmr.22.00185","url":null,"abstract":"Coal mine overburden as well as thick inseam parting materials found in the lower Gondwana basin are often treated as mine wastes. Unused fly ash from coal fired plants is another waste material. This investigation focused on using these wastes to develop better composite materials. Composite materials of varying composition with coal mine wastes from 50% to 90% and fly ash from 10% to 50% were developed with 2 to 6% cement additives. Their physical, chemical and geotechnical properties were determined. OPC strongly influenced the geotechnical properties. Fly ash presence were optimized for unconfined compressive strength (UCS) and California bearing ratio for both the mine wastes. Composite materials with 70% overburden, 30% fly ash, and 6% cement showed 4.01 MPa UCS at 56 days. Similarly, 80% inseam parting, 20% fly ash, and 6% cement produced 4.90 MPa UCS at 56 days. Analysis of fly ash present in the two composites and their strength values produced linear correlations. Pearson and Spearman’s coefficients produced high correlation of −0.9 for the composite prepared with parting materials. Microstructural analysis showed C-S-H gel formation occurring at 28 days. The composites meet the strength criterion for the base and sub-base of the coal mine haul road.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47605064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

The effects of Zn doping on the thermoelectric performance of Cu12Sb4S13 Zn掺杂对Cu12Sb4S13热电性能的影响

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.21.00144

Mian Liu, Changsong Liu, X. Qin

{"title":"The effects of Zn doping on the thermoelectric performance of Cu12Sb4S13","authors":"Mian Liu, Changsong Liu, X. Qin","doi":"10.1680/jemmr.21.00144","DOIUrl":"https://doi.org/10.1680/jemmr.21.00144","url":null,"abstract":"We used first-principles electronic structure calculations and Boltzmann transport theories to understand the thermoelectric behavior of tetrahedrites. We performed calculations on the Zn substituted derivatives with Zn occupied each lattice site in the parent compound Cu12Sb4S13, to study Zn substitution mechanism, and the relation between Zn substitution site and thermoelectric performance. We found that the most energetically favorable sites for Zn is the Cu(1) sites, and the next is the Cu(2) sites. And the room-temperature Seebeck coefficient of the host was enhanced nearly 255 and 7 times by Zn doping at Cu(1) and Cu(2) sites, owing to the decrease of carrier concentration and the increase of band effective mass, respectively. However, the electrical conductivity showed a marked decrease upon Zn doping at Cu(1) and Cu(2) sites, due to the decrease in carrier contribution and low mobility, respectively. As a result, the Cu12Sb4S13 compounds substituted with Zn at Cu(1) sites have a preferable optimizing power factor at room temperature. The optimizing power factor of the host could get an about 8-time improvement at room temperature upon Zn substituting at Cu(1) sites.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41547144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Research on the influence of clay shock on inert slurry in shield tunneling construction 盾构施工中粘土冲击对惰性浆体影响的研究

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00173

Y. Wan, He Sun, Zhiduo Zhu, Wangwen Huo, Chen Zhang

{"title":"Research on the influence of clay shock on inert slurry in shield tunneling construction","authors":"Y. Wan, He Sun, Zhiduo Zhu, Wangwen Huo, Chen Zhang","doi":"10.1680/jemmr.22.00173","DOIUrl":"https://doi.org/10.1680/jemmr.22.00173","url":null,"abstract":"Shield-out synchronous grouting is a new technology used to temporarily fill shield-out spaces between strata and the shield when creating subterraneous tunnels. The grouting materials are called ‘clay shock,’ which are soft, plastic, sticky, and easily dispersed via a pressurized jet. This study analyzes the mixing process of clay shock and backfill grouting material (inert slurry), and investigates the influence of clay shock on the inert slurry through laboratory testing. The findings show that the fluidity and bleeding rate of the inert slurry continuously decreases with the clay shock volume. The unconfined compressive strength (UCS) and flexural strength of the inert slurry increase initially before decreasing with the clay shock volume ratio. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results reveal that the alkalinity of the clay shock initiates an alkali excitation reaction, which generates more gelling products and increases the strength of the inert slurry. Excessive clay shock causes the inert slurry to retain a loose and porous structure, which then decreases its strength. To ensure the effect of the inert slurry on settlement control, the grouting volume of the clay shock should not exceed 1/4 of the inert slurry volume.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44277413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Impact of truncation on absorption spectra in graphene-based random photonic crystal 截断对石墨烯基随机光子晶体吸收光谱的影响

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00087

Pulimi Mahesh, C. Nayak, Damodar Panigrahy

{"title":"Impact of truncation on absorption spectra in graphene-based random photonic crystal","authors":"Pulimi Mahesh, C. Nayak, Damodar Panigrahy","doi":"10.1680/jemmr.22.00087","DOIUrl":"https://doi.org/10.1680/jemmr.22.00087","url":null,"abstract":"The present study investigates the influence of randomness on getting multi-mode broadband and narrowband absorption of graphene-embedded photonic structures. In the first proposed photonic configuration, with the change in randomness parameter, it is possible to get single, multi-mode broadband absorption up to 0.8. This value was further enhanced up to 0.99 by varying the Fermi-level to −0.9 eV. The position of absorption peaks can be tuned by varying thickness of the silicon carbide layer. Further, an investigation is carried out on the influence of adding a defective periodic PC to the first photonic configuration, which provided a multi-mode narrowband absorption with a value up to 0.99 and the strength and location of absorption peaks can be altered to the desired value by changing the graphene’s Fermi level and thickness of the silicon carbide layer. Finally, the authors also survey the influence of magnetic field B on the absorption behaviour of LCP and RCP waves. The results indicate that the FWHM of absorption peaks expanded with applying a positive magnetic field for LCP waves, whereas it shrinks for RCP waves. It has applications in the design of tunable broadband, narrowband absorbers, and sensors.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48310367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Flake shaped ZnFe2O4 nanoparticles: synthesis, characterization and visible light induced photocatalytic study 片状纳米ZnFe2O4:合成、表征及可见光诱导光催化研究

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00184

J. P. Dhal, Amit Sahoo, A. Acharya

引用次数: 2

Effect of longitudinal magnetic field on arc motion and joint structure of hollow stud 纵向磁场对空心螺柱电弧运动及接头结构的影响

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00221

Deku Zhang, Mengyu Duan, Xinkai Zhu, Hongyu Zhang, Chonglin Wu, Kehong Wang

引用次数: 1

Modified ZnO mediated dye detoxification by a heterogeneous Fenton process 改性ZnO介导的染料非均相Fenton脱毒

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00151

A. Alsukaibi, Mohd A. Khan, Ahmed M. Al-Otaibi, A. Alshamari, Eida Mohammad Alshammari, L. Mechi, F. Alimi, S. Khan

{"title":"Modified ZnO mediated dye detoxification by a heterogeneous Fenton process","authors":"A. Alsukaibi, Mohd A. Khan, Ahmed M. Al-Otaibi, A. Alshamari, Eida Mohammad Alshammari, L. Mechi, F. Alimi, S. Khan","doi":"10.1680/jemmr.22.00151","DOIUrl":"https://doi.org/10.1680/jemmr.22.00151","url":null,"abstract":"The continuous and unchecked discharge of effluents by the dyeing industry in water bodies, have lead to the rising importance of water treatment. This study focusses on the successful abatement of Auramine O (AM) dye in the aqueous system by a heterogeneous Fenton process using ultrasonication. Zinc oxide (ZnO) nanoparticles (NPs) were obtained by a straightforward precipitation method and then modified by glycine (M-ZnO). The NPs size sharply decreased upon modification with glycine. Light absorbing capacity and band gap were determined by Ultra Violet (UV) visible spectrophotometry. X-ray diffraction (XRD) was used to determine the basic crystal properties, such as crystallinity. Changes in crystal size and morphology were determined by scanning electron microscopy (SEM), while high-resolution transmission electron microscopy (HRTEM) provide more information on the shape and size of NPs. It was observed that the size of NPs sharply decreased from 24.6 nm (pure ZnO) to 17.3 nm upon modification of ZnO with glycine. A bandgap of 3.4 eV was determined for M-ZnO using UV-visible spectrophotometer. Fourier transform infrared (FTIR) spectroscopy was used to find different functional groups along with the presence of ZnO, which further confirmed the modification of ZnO with glycine. Thermal gravimetric analysis revealed the excellent thermal stability of M-ZnO compared with ZnO. The catalytic activity for AM abatement was determined using a Fenton process at pH 6. Detoxification assays showed pure H2O2 or pure ZnO exhibited 38% and 37% AM dye degradation respectively. However, M-ZnO showed 97% of AM dye degradation in 240 min. A plausible mechanism has been proposed for AM abatement using ZnO.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49010211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Effects of modified argon glow plasma source on PET polymeric surface properties 改性氩辉光等离子体源对PET聚合物表面性能的影响

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-06-01 DOI: 10.1680/jemmr.22.00199

H. Al-Yousef, M. Atta, E. Abdeltwab, A. Atta, M. Abdel-Hamid

{"title":"Effects of modified argon glow plasma source on PET polymeric surface properties","authors":"H. Al-Yousef, M. Atta, E. Abdeltwab, A. Atta, M. Abdel-Hamid","doi":"10.1680/jemmr.22.00199","DOIUrl":"https://doi.org/10.1680/jemmr.22.00199","url":null,"abstract":"A home-made plasma source with a Langmuir electrical probe was built for this work in order to create a plasma beam that could be utilized successfully in a range of uses. By modifying the operational parameters, including the discharging voltage, cathode-anode spacing, as well as argon (Ar) pressure, a steady discharging media was achieved. Additionally, a locally design electrical probe is introduced into the discharging plasma to monitor the current-voltage (I-V) characteristics curve in order to assign plasma properties. The probe is moved to any intended destination in the plasma volume and has the following dimensions: 1 mm in length, 0.5 mm in diameter. The gas pressure as well as probe-cathode separation are modified to record the plasma characteristics including electron density and electron temperature. As the pressure rises from 0.15 up to 0.3 Torr, it was found that the electron temperature Te varies 4.66*104 to 2.91*104 eV. By subjecting PET polymeric film to Ar plasma beams, its surface wettability is altered. By increasing the plasma period from 0 to 8 minutes, the overall surfaces free energy is raised from 32.2 to 67.7 mJ/m2. Additionally, the developed plasma source is highly efficient and tailored to satisfy the needs of applications like polymeric-surface modifications.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48847846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Image-driven deep learning enabled automatic microstructural recognition 图像驱动的深度学习实现了自动微结构识别

IF 2.2 4区材料科学

Emerging Materials Research Pub Date : 2023-03-01 DOI: 10.1680/jemmr.22.00010

Rishabh Nigam, Vedasri Bai Khavala, Khushbu Dash, Nachiketa Mishra

{"title":"Image-driven deep learning enabled automatic microstructural recognition","authors":"Rishabh Nigam, Vedasri Bai Khavala, Khushbu Dash, Nachiketa Mishra","doi":"10.1680/jemmr.22.00010","DOIUrl":"https://doi.org/10.1680/jemmr.22.00010","url":null,"abstract":"Deep learning (DL) method consisting of Convolutional Neural Network (CNN) was employed to automate the task of microstructural recognition and classification to identify dendritic characteristics in metallic microstructures. The dendrites are an important feature which decide the mechanical properties of an alloy, further the dendritic arm spacing is critical in ascertaining the values of strength and ductility. The current work has been divided into two tasks i.e., classification of microstructures into dendritic and non-dendritic (Task 1) and further classifying the dendritic microstructures into longitudinal and cross-sectional view (Task 2). The data set comprising of micrographs from experimental and online sources covering a broad range of alloy compositions, micrograph magnifications and orientations. The tasks were achieved by employing a 4 layered CNN to yield an accuracy of 97.17±0.64% for Task 1 and 87.86±1.07% for Task 2 independently. The employment of deep learning model for classification of microstructures circumvents the feature extraction step while ensuring high accuracy. This work reduces dependency on skilled and experienced researchers and expedites the material development cycle.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44786148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1