Research & Development in Material Science最新文献_第3页

Colloidal Microwave Absorber based on Magnetic Fluid of Iron Oxide Nanoparticles 基于氧化铁纳米颗粒磁流体的胶体微波吸收体

Research & Development in Material Science Pub Date : 2021-06-01 DOI: 10.31031/rdms.2021.15.000860

A. Shukla

{"title":"Colloidal Microwave Absorber based on Magnetic Fluid of Iron Oxide Nanoparticles","authors":"A. Shukla","doi":"10.31031/rdms.2021.15.000860","DOIUrl":"https://doi.org/10.31031/rdms.2021.15.000860","url":null,"abstract":"Magnetic nanofluid was prepared by dispersing iron oxide nanoparticles in aqueous medium. Water dispersible iron oxide nanoparticles were synthesized by solvothermal decomposition of iron (III) acetylacetonate [Fe(AcAc)3] in Polyethylene Glycol 400 [PEG] and Polyacrylic Acid (PAA). Crystal structure was investigated using X-ray Diffraction (XRD) and magnetic properties were measured by using Vibrating Sample Magnetometer (VSM). Further, the XRD and VSM data were successfully used to retrieve the crystallite size and size distribution from powder samples. Particle size and size distribution extracted from magnetization curve have been found to be consistent with XRD and AFM. Microwave absorption of magnetic nanofluid can be controlled through changes in volume fraction of nanoparticle in dielectric aqueous fluid. Microwave absorbing properties of iron oxide nanoparticles are evaluated and presented here. Reported approach is a first step toward the development of switchable absorbers to operate reversibly between different states (absorption in presence of magnetic fluid or transmission in absence of magnetic fluid) by movement of magnetic fluid under external magnetic field in air or in non-dispersive carrier liquid.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76019692","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

Closed Die Hot Forging Process Analysis using Qform 基于Qform的闭模热锻工艺分析

Research & Development in Material Science Pub Date : 2021-06-01 DOI: 10.31031/rdms.2021.15.000861

Tripathy S

引用次数: 0

The Influence of the Nanostructures on the Dye Adsorption in Dye Sensitized Solar Cell 纳米结构对染料敏化太阳能电池染料吸附性能的影响

Research & Development in Material Science Pub Date : 2021-05-17 DOI: 10.31031/rdms.2021.15.000859

P. M. da Silva

引用次数: 2

Iterative Tomography of Pipes During Operation 管道运行过程中的迭代层析成像

Research & Development in Material Science Pub Date : 2021-05-11 DOI: 10.31031/rdms.2021.15.000858

Zolotarev Sa

引用次数: 1

Disintegration Properties and Drug Release Profiles of Sodium Alginate Films Containing Rebamipide 含利巴米胺海藻酸钠薄膜的崩解特性及释药特性

Research & Development in Material Science Pub Date : 2021-03-24 DOI: 10.31031/RDMS.2021.15.000853

Y. Murata, C. Maida, K. Kofuji

引用次数: 0

Annual Inhalation Dose of Indoor Radon and Thoron in Mizoram, India 印度米佐拉姆邦室内氡和钍的年吸入剂量

Research & Development in Material Science Pub Date : 2021-03-05 DOI: 10.31031/RDMS.2021.15.000852

Chhangte Lz

引用次数: 0

Characterization of Coir Pith Ash Blended Cement Pastes 椰髓灰混合水泥浆的表征

Research & Development in Material Science Pub Date : 2021-03-04 DOI: 10.31031/RDMS.2021.15.000851

Darweesh Hhm

{"title":"Characterization of Coir Pith Ash Blended Cement Pastes","authors":"Darweesh Hhm","doi":"10.31031/RDMS.2021.15.000851","DOIUrl":"https://doi.org/10.31031/RDMS.2021.15.000851","url":null,"abstract":"More undesirable wastes or by-products are generated from the coconut and coir industry as coir pith. The raw coir pith was fired up to 500 ºC inside a suitable oven to obtain Coir Pith Ash (CPA). The effect of CPA as a supplementary cementitious material on the various specific characteristics of Portland cement pastes was investigated. Results illustrated that the blaine fineness of the whole cement blend, water of consistency and setting times increased with the increase of CPA addition. The bound water content and bulk density as well as flexural and compressive strengths improved and enhanced with the addition of CPA only up to 12wt % CPA (CP4), and then sharply decreased suddenly with further increase of CPA content (CP5). The free lime content of the blended cement pastes containing different ratios of CPA decreased at all hydration times and were being lower than those of the blank (CP0). The apparent porosity also gradually reduced with cement pastes containing up to 12wt % CPA as in the cement blend CP4, but then increase with further increase of CPA content > 12wt% CPA as in the cement blend CP5. The Ultrasonic Pulse Velosity (USPV) test showed that the matrix conformities of the various hardened cement pastes with CPA are well sticky and good quality.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77062405","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: 4

Heterogeneous Photocatalysts Based on TiO2 for Abatement of Hazardous Air Pollutants 基于TiO2的多相光催化剂对有害空气污染物的去除

Research & Development in Material Science Pub Date : 2021-02-15 DOI: 10.31031/RDMS.2021.14.000850

Amra Bratovčić

引用次数: 0

Investigation of Effects of Material Dimensions on Wrinkling in Flexforming Process 柔性成形过程中材料尺寸对起皱影响的研究

Research & Development in Material Science Pub Date : 2021-02-12 DOI: 10.21203/RS.3.RS-189051/V1

Gürhan Yılgın, Oguzhan Yilmaz, Fahrettin Ozturk, Hasan Ali Hatipoglu

{"title":"Investigation of Effects of Material Dimensions on Wrinkling in Flexforming Process","authors":"Gürhan Yılgın, Oguzhan Yilmaz, Fahrettin Ozturk, Hasan Ali Hatipoglu","doi":"10.21203/RS.3.RS-189051/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-189051/V1","url":null,"abstract":"\u0000 Sheet metal forming processes are very common manufacturing and leading processes in automotive and aerospace industries. Flexforming is one of the sheet metal forming processes which is preferable due to its flexible manufacturing capabilities and its ability to produce multiple parts simultaneously. Convex contoured shaped parts are very much used in aerospace structures which are mostly produced by flexforming. Wrinkling is a characteristic defect for those kinds of parts. Prediction of wrinkling before manufacturing is highly crucial in order to reduce scrap rates, labor time, and other unexpected costs. In this research work, extensive amounts of experiments are conducted on flexforming press, and the process parameters such as material condition, contour radius, flange length, and material thickness which induce wrinkling are investigated in detail. Results have shown that sheet thickness is the most effective parameter, and as the sheet thickness is increased, wrinkling tendency is reduced extensively. Besides, increasing convex contour radius decreases wrinkling occurrence. Experimental findings are then used to generate wrinkling limit diagrams in which safety and failure zones are specified for different material conditions and sheet thicknesses. The developed diagrams might help to designer who can design defect free parts, reduce scrap rates, and reduce production costs significantly.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77610020","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

Micron-scale Monte Carlo Simulations for Additive Manufacturing using Electron Beam 电子束增材制造的微米尺度蒙特卡罗模拟

Research & Development in Material Science Pub Date : 2021-01-22 DOI: 10.31031/RDMS.2021.14.000849

I. Orion, E. Tiferet

{"title":"Micron-scale Monte Carlo Simulations for Additive Manufacturing using Electron Beam","authors":"I. Orion, E. Tiferet","doi":"10.31031/RDMS.2021.14.000849","DOIUrl":"https://doi.org/10.31031/RDMS.2021.14.000849","url":null,"abstract":"The powder bed additive manufacturing process for metal 3D printing uses laser or electron beam as its energy source for selective melting. While simulation of laser beam has been extensively investigated, Electron Beam Melting has been less scrutinized. Electron energy deposition in the metal powder is subjected to the way in which electrons transport in matter; this is a complicated process to follow and to obtain its characteristics. Simulating variety of energy and flux will enable better optimization of the AM process. We describe a Monte Carlo method simulation designed to evaluate the feasibility and utility of generating realistic particle-scale, powder bed configurations to investigate the additive manufacturing process in metals. Of particular interest here is the Electron Bean Melting process, by which micron-sized titanium particles are heated to above the melting point by a selectively directed electron beam. To this end full simulation details were introduced into the EGS5 Monte Carlo code, a general-purpose electron and photon transport program. A titanium solid body of a 50-micron radius in front of a wide beam at 60keV kinetic energy was defined. Energy deposition into the body, scattered electron energy, and angular distribution were then tallied. In addition, several visual electron-track analyses were demonstrated. From these simulations a new perspective of additive manufacturing process was attained, and a momentum transfer from electron to metal bodies formulated.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90332491","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