材料科学与化学工程(英文)最新文献_第6页

Experimental and Computational Study of the Microwave Absorption Properties of Recycled α-Fe2O3/OPEFB Fiber/PCL Multi-Layered Composites 再生α-Fe2O3/OPEFB纤维/PCL多层复合材料微波吸收性能的实验与计算研究

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.103003

E. Mensah, R. Azis, Z. Abbas

{"title":"Experimental and Computational Study of the Microwave Absorption Properties of Recycled <i>α</i>-Fe2O3/OPEFB Fiber/PCL Multi-Layered Composites","authors":"E. Mensah, R. Azis, Z. Abbas","doi":"10.4236/msce.2022.103003","DOIUrl":"https://doi.org/10.4236/msce.2022.103003","url":null,"abstract":"The aim of this study was to fabricate multi-layered recycled α-Fe2O3/OPEFB fiber/PCL composites for microwave absorbing applications in the 1 4 GHz frequency range. The multi-layered composites were 6 mm thick and each consisted of a 2 mm thick layer of recycled α-Fe2O3/PCL composites at various loadings (5 wt% 25 wt%) of 16.2 nm recycled α-Fe2O3 nanofiller, placed between two layers of 2 mm thick OPEFB fiber/PCL composites blended at a fixed ratio of 7:3. The real (ε') and imaginary (ε\") components of the relative complex permittivity were measured using the open-ended coaxial probe technique and the values obtained were applied as inputs for the Finite Element Method to calculate the reflection coefficient magnitudes from which the reflection loss (RL) properties were determined. Both ε' and ε\" increased linearly with recycled α-Fe2O3 nanofiller content and the values of ε' varied between 3.0 and 3.9 while the ε\" values ranged between 0.26 and 0.64 within 1 4 GHz. The RL (dB) showed the most prominent values within the 1.38 1.46 GHz band with a minimum of -38 dB attained by the 25 wt% composite. Another batch of minimum values occurred in the 2.39 3.49 GHz range with the lowest of −25 dB at 2.8 GHz. The recycled α-Fe2O3/OPEFB fiber/PCL multi-layered composites are promising materials that can be engineered for solving noise problems in the 1 4 GHz range.","PeriodicalId":66693,"journal":{"name":"材料科学与化学工程(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70519706","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

New C-13 Norisoprenoids and Flavonoids from Lannea kerstingii 新C-13异戊二烯类化合物和黄酮类化合物

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.1010002

Jean-Michel Niambet Koffi, P. A. Yao-Kouassi, Chardin Seri Seri, A. A. Magid, Z. L. E. Akissi, L. Voutquenne-Nazabadioko

引用次数: 0

3D Bio-Printed Bone Scaffolds Incorporated with Natural Antibacterial Compounds 含有天然抗菌化合物的3D生物打印骨支架

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.103005

Zhuofeng Zhang, Yiqi Yang, Hongbo Zhang, Shengbing Yang, R. Yin, Wenjun Zhang

引用次数: 1

Study of Magnetite Crystal Structure Extracted from Local Sands of Tegal Lenga Beach 合法伦加海滩当地沙中磁铁矿晶体结构的研究

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.109001

P. Suardana, M. Sumadiyasa, I. Hendrawan

引用次数: 0

UV-LED Curing Cationic Passivation Film for the Surface of Hot-Dip Aluminum-Zinc Coated Steel Plate 热浸镀铝锌钢板表面UV-LED固化阳离子钝化膜

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.109003

Wei‐Chen Lu, Linling Wu, Chun-yu Ma, Qian Zhang

引用次数: 0

Electrostatic Complexes of Nano-Montmorillonite/Ethyl Lauroyl Arginate Stabilized Sunflower Oil Pickering Emulsions 纳米蒙脱土/月桂酰精酸乙酯稳定葵花籽油酸洗乳的静电配合物

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.107003

Qi Luo, Chang-Huei Jing, Chuanyu Yang, Dehai Yu

{"title":"Electrostatic Complexes of Nano-Montmorillonite/Ethyl Lauroyl Arginate Stabilized Sunflower Oil Pickering Emulsions","authors":"Qi Luo, Chang-Huei Jing, Chuanyu Yang, Dehai Yu","doi":"10.4236/msce.2022.107003","DOIUrl":"https://doi.org/10.4236/msce.2022.107003","url":null,"abstract":"Compared with traditional surfactant-stabilised emulsions, Pickering emulsions, stabilised by clay nanoparticles, have the advantages of strong interface stability, strong versatility, and low toxicity. Moreover, they have excellent application potential in the fields of food and medicine. In this study, a food-grade Pickering emulsion stabiliser was prepared by physically adsorb-ing the cationic surfactant ethyl lauroyl arginate (LAE) on the surface of na-no-montmorillonite (NMMT). Different LAE/NMMT combinations were assessed for their capacity to stabilise an oil-in-water emulsion at a low solid concentration (0.5%, w/v). The controllability of the droplet diameter and stability of the Pickering emulsions can be realised by changing the content of LAE. Scanning electron microscopy (SEM), and laser confocal microscopy (CLSM) confirmed the successful preparation of sunflower oil Pickering emulsion droplets stabilised by LAE/NMMT (0.0075%/1%). Additionally, the LAE/NMMT studied in this work could be used as a highly effective antibacterial surfactant with inorganic nanoparticles to efficiently stabilise Pickering emulsions, thus expanding the potential of preparing edible Pickering emulsion formulae.","PeriodicalId":66693,"journal":{"name":"材料科学与化学工程(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70519696","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

Toughening of Immiscible rPS/SAN Blends by SEBS Elastomers: Properties and Morphology SEBS弹性体对非混相rPS/SAN共混物的增韧:性能和形貌

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.103004

Khaled Bedjaoui, R. Navarro, R. Krache, J. L. Valentín, Rebeca Herrero Calderon, Alberto Fernandez Torres, A. M. Fernández

引用次数: 2

Efficiency and Effectiveness Method versus ε-NTU Method with Application in Finned Flat Tube Compact Heat Exchanger with Water-Ethylene Glycol as Nanofluid Base of Iron Oxide Nanoparticles 效率与效果法与ε-NTU法在以水-乙二醇为氧化铁纳米流基的翅片平板管紧凑型换热器中的应用

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.102001

E. Nogueira

{"title":"Efficiency and Effectiveness Method versus ε-NTU Method with Application in Finned Flat Tube Compact Heat Exchanger with Water-Ethylene Glycol as Nanofluid Base of Iron Oxide Nanoparticles","authors":"E. Nogueira","doi":"10.4236/msce.2022.102001","DOIUrl":"https://doi.org/10.4236/msce.2022.102001","url":null,"abstract":"This work aims to establish comparisons between two models used for the performance of heat exchangers. The chosen system, in this case, consists of a heat exchanger used in automotive radiators flat finned tube type. Water and ethylene glycol compound as base fluid and volume fractions of iron oxide nanoparticles (Fe 3 O 4 ) are used as a refrigerant. The quantities determined in this work are the nanofluid exit temperature, the air exit temperature, the absolute error between the models for heat transfer rate, and Effectiveness. The quantities that constitute parameters, independent variables, are the airflow, represented by the Reynolds number, and the iron oxide volume fraction. Ethylene Glycol 50% compound has slightly better thermal performance than pure water and reduces the reactive effect of water on the environment, increasing the average life of the equipment. The absolute relative error be tween the models is less than 20% and presents maximum values with the increase of the nanoparticle volume fraction and growth in the Reynolds number for the air. versus Method in Finned Flat Tube Heat Exchanger with","PeriodicalId":66693,"journal":{"name":"材料科学与化学工程(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70520032","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: 2

A Pilot Study on the Concentration of Heavy Metals in Sediments from the Lower Orange River, //Karas Region, Namibia 纳米比亚卡拉斯地区奥兰治河下游沉积物中重金属浓度的初步研究

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2021.103001

R. Pitiya, Lubang Jacob, Rakotonirina Judye Emilinot

{"title":"A Pilot Study on the Concentration of Heavy Metals in Sediments from the Lower Orange River, //Karas Region, Namibia","authors":"R. Pitiya, Lubang Jacob, Rakotonirina Judye Emilinot","doi":"10.4236/msce.2021.103001","DOIUrl":"https://doi.org/10.4236/msce.2021.103001","url":null,"abstract":"Global water shortage is caused not just by the physical scarcity of water, but also by gradual deterioration of the quality of water resources such as lakes, streams and rivers with heavy metals. This present study evaluated the status of Mn, Fe, Cr, Cu, Ni, As, Zn, Pb and Cd in sediments from the lower Orange River by Inductively Coupled Plasma Atomic Emission Spectrometry technique by collecting a total of eleven samples, each weighing 1 2 kg at the depth of 15 20 cm from two observations sites along the lower Orange River and applying pollution indicators such as contamination factor(CF), pollution load index(PLI), index of geo-accumulation(Igeo) and enrichment factor(EF) to assay the nature and extent of heavy metals contamination in sediments. The sequence of the total heavy metal content in descending order was Fe > Mn > Cr > As > Zn > Ni > Cu > Pb > Cd. The results of CF and Igeo showed Mn, Cd, Ni, Zn and Pb were minor sources of sediment contamination since most of the samples were unpolluted and moderately polluted by these metals. However, most sediments were moderate to considerably polluted with Cr, As and Fe suggesting that these were the major pollution sources. The value of PLI at one of the two observation sites was equivalent to the value of baseline level, while the next site indicted quality deterioration of the sediments. The EF revealed that Cr was moderately enriched and arsenic (As) significantly enriched in all the sediments, which suggested contamination due to anthropogenic intervention. Hence, it is recommended that sediment quality be evaluated on a regular basis to avoid further deterioration of the Orange River’s health, which might have detrimental repercussions for both aquatic life and local communities along the river.","PeriodicalId":66693,"journal":{"name":"材料科学与化学工程(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70518899","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

Optimization of Preparation Conditions of Activated Carbons Based on the Shells of Ricinodendron heudoltii 蓖麻壳活性炭制备条件的优化

材料科学与化学工程(英文) Pub Date : 2022-01-01 DOI: 10.4236/msce.2022.1010004

K. Y. Urbain, Karidioula Daouda, Zran Vanh Eric-Simon, Trokourey Albert, Y. Benjamin, Drogui Patrick

引用次数: 1