Research & Development in Material Science最新文献_第6页

A Recent Developments in Photocatalytic Water Splitting by TiO2 Modified Photocatalysts TiO2改性光催化剂在光催化水分解中的研究进展

Research & Development in Material Science Pub Date : 2020-08-25 DOI: 10.31031/rdms.2020.14.000827

Amra Bratovcic

{"title":"A Recent Developments in Photocatalytic Water Splitting by TiO2 Modified Photocatalysts","authors":"Amra Bratovcic","doi":"10.31031/rdms.2020.14.000827","DOIUrl":"https://doi.org/10.31031/rdms.2020.14.000827","url":null,"abstract":"As populations grow, global energy consumption in the next 30 years is predicted to rise by nearly 50%. Nowadays and many years before, the most energy worldwide is provided by fossil fuel which leads to severe pollution and contributes to the greenhouse effect. Hydrogen is the most ideal alternative clean energy, but currently, there is no significant hydrogen production from renewable sources. Hence, there is an urgent need for the development of new photocatalysts which will allow a water splitting for hydrogen production. The photocatalytic water splitting using TiO 2 offers a promising approach for clean, low-cost, and environmentally friendly production of hydrogen as a sustainable fuel. This paper reviews some recently used methods of synthesis such as hydrothermal, rapid breakdown anodization method, impregnation method, and sol-gel synthesis for the preparation of modified TiO 2 materials. These methods of synthesis provide the production of ultra-thin mesoporous TiO 2 nanosheets, nanorods, and nanotubes as well as heterojunction structures. Some investigations show that introduction of Ti 3+ atomic defects is beneficial for the photocatalytic water splitting for hydrogen generation. Some progress has been achieved by heterocoupling the two or more semiconductors. There is experimental evidence that in the presence of alcohol as a sacrificial agent, H 2 production rates decreased from a higher number of hydroxyl groups i.e. in order 3>2>1. The H 2 generation is also larger when TiO 2 is modified with the addition of small quantity of metal nanoparticles such as Pt, Pd, and Ni. One study has shown that the samples sensitised with Pt nanoparticles were superior to Pd and Ni modified TiO 2 , the other has shown that the co-catalyst activity followed the order Pd>Pt≈Au.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78433516","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

A Study on Synthesis, Structural and Magnetic Properties of La2O3 Doped Isotropic Ba-M Ferrites La2O3掺杂各向同性Ba-M铁氧体的合成、结构和磁性能研究

Research & Development in Material Science Pub Date : 2020-08-13 DOI: 10.31031/rdms.2020.13.000825

Zubair Ahmad

{"title":"A Study on Synthesis, Structural and Magnetic Properties of La2O3 Doped Isotropic Ba-M Ferrites","authors":"Zubair Ahmad","doi":"10.31031/rdms.2020.13.000825","DOIUrl":"https://doi.org/10.31031/rdms.2020.13.000825","url":null,"abstract":"Present work reports the synthesis, structural and magnetic properties of BaFe 11 O 17.5 and La 2 O 3 doped (Ba La 0.05 Fe 11 O 17.575 , BaLa 0.1 Fe 11 O 17.65 , BaLa 0.2 Fe 11 O 17.80 and BaLa 0.3 Fe 11 O 17.95 ) ferrites produced through powder metallurgy method with escalated magnetic properties. Phase evaluation, crystal structure, microstructure, and magnetic properties thermomagnetic characteristics for the La doped and La free ferrites have been investigated at varying sintered temperatures. XRD studies revealed that BaFe 12 O 19 phase is formed at 900 ̊C through the reaction of Fe 2 O 3 and BaFe 2 O 4 . Electron microscopy studies elucidated that microstructural features depend critically on the heat treatment conditions as well as La content. La addition up to 1.0 mole found to be beneficial to refine particle size close to single domain wall size, which, in turn, led to enhance magnetic properties of the ferrite. Optimum magnetic properties for the La free BaFe 11 O 17.5 are H c =4.4kOe, B r =1.9kG, and (BH) max =0.85MGOe which were improved to H c =4.9kOe, B r =2.4kG and (BH) max =1.2MGOe with La 2 O 3 additive. The La 2 O 3 acts as a grain growth inhibitor and led to enhance high coercivity of 4.9kOe in the ferrite. The dielectric constant and dielectric loss factor decrease monotonically with increasing applied frequency at the constant temperature. Permeability is found to be sensitive to density and microstructural components like grain size and porosity of the sintered ferrites.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86112858","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

On the Relation between Material Property and Part Performance 论材料性能与零件性能的关系

Research & Development in Material Science Pub Date : 2020-07-07 DOI: 10.31031/rdms.2020.13.000822

Ma Mingtu

引用次数: 0

One-step Reversal Technique towards Hydrophilic Surface Modification of Polydimethylsiloxane-co-Polyurethane (PDMS-PU) 聚二甲基硅氧烷-共聚氨酯(PDMS-PU)亲水性表面改性的一步反转技术

Research & Development in Material Science Pub Date : 2020-07-07 DOI: 10.31031/rdms.2020.13.000820

Mulenga Kalulu

引用次数: 0

Characterization of Butadiene Styrene Rubber Composites with Halloysite Filler 高岭土填充丁二烯-苯乙烯橡胶复合材料的表征

Research & Development in Material Science Pub Date : 2020-07-07 DOI: 10.31031/rdms.2020.13.000821

H. Valiev

引用次数: 0

The Study on the Reducibility of Itakpe Iron Ore Lumps 伊塔克普铁矿块的可还原性研究

Research & Development in Material Science Pub Date : 2020-06-19 DOI: 10.31031/rdms.2020.13.000819

C. Ocheri

{"title":"The Study on the Reducibility of Itakpe Iron Ore Lumps","authors":"C. Ocheri","doi":"10.31031/rdms.2020.13.000819","DOIUrl":"https://doi.org/10.31031/rdms.2020.13.000819","url":null,"abstract":"The study on the reducibility on the Itakpe iron ore lumps were carried out. The chemical compositions, structural analysis and morphological structures of the ores were examined. Some analytical instruments and equipment were used to determine the Thermogravimetry (TG), the Differential Thermal Analyzer (DTA), the X-Ray Fluorescence (XRF) and X-Ray Diff action (XRD). Optical Microscopy and Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDS) were also used for further analyses .The reducibility study was performed in the laboratories of the Department of Metallurgical and Materials Engineering, University of Nigeria, Nsukka, Nigeria. A muffle furnace with model number LABE 1210, Divine international. The heating capacity of 1500 ͦC as the heating device was used for the experiments. The samples were heated to temperature range from 800 ͦC to 1000 ͦC with temperature interval of 40 ͦC .The duration allowed for each of the experiments ranged from 20 minutes to 120minutes and also allowed interval time of 20 minutes. The iron ore lumps were taken inside six stainless steel containers with diameter 0.675cm x 0.594cm inside diameter with the mouths tightly closed with air tight covers for gas escape, the metallurgical coking coal obtained from the Ajaokuta Steel Company Limited was used as a reducing agents . The highest reduction value of Itakpe iron ore lump was obtained at 74.3% with corresponding temperature at 1000 ͦC at time rate of 120minutess. The (SEM) and (EDS) were used to determine the iron (Fe) content after the reducibility tests were performed. Some recommendations and contributions from the research work was stated to assist the would - be researchers in this field of study.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90754526","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

Adequate Power Supply: A Must for Effective Teaching of Technological Education 充足的电源:技术教育有效教学的必要条件

Research & Development in Material Science Pub Date : 2020-06-02 DOI: 10.31031/rdms.2020.13.000818

Adebayo Aa, Adeoye Os

{"title":"Adequate Power Supply: A Must for Effective Teaching of Technological Education","authors":"Adebayo Aa, Adeoye Os","doi":"10.31031/rdms.2020.13.000818","DOIUrl":"https://doi.org/10.31031/rdms.2020.13.000818","url":null,"abstract":"Adequate power supply is found to be missing in Nigeria and this has resulted into a continual lack of supply to the populace. Perennially, it has appear as if the problem of power supply is one that cannot be surmounted and government in and out has always budgeted a large sum of money to the sector and the only result that the people sees is lack of power. Any government coming into governance has always made it part of what they plan to do if voted into elected offices but the only thing the people enjoy is lack of power. The driver of any economy is found to be adequate power supply. Dependency on power supply cannot be overemphasized; both human beings and animals largely depend on it for them to perform optimally. Teaching of technological education is one that is almost impossible without adequate power supply. The method used was the collection of data through the administration of questionnaires. Real time measurements of voltage at the selected laboratories were carried out with the aid of multi meters and plots of voltage deviation against time with the aid of Microsoft spread sheets. Also, data showing the period of power supply and outage for a certain period of time in order to verify the adequacy of power supply to the selected area under consideration. This paper takes proffer solutions by the way of use of solar panels, generating sets and uninterruptible power supply to overcome all these challenges.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79734146","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

Substitutional Studies of Powdered Palm Kernel Shell (PPKS) for Carbon Black, Kaolin and Calcium Carbonate as Fillers in Natural Rubber Compounding 棕榈仁壳粉替代炭黑、高岭土和碳酸钙在天然橡胶复合中的应用研究

Research & Development in Material Science Pub Date : 2020-05-27 DOI: 10.31031/rdms.2020.13.000816

Awatefe Kj, Idibie Ca, Olagbemiro To, O. Akaranta

{"title":"Substitutional Studies of Powdered Palm Kernel Shell (PPKS) for Carbon Black, Kaolin and Calcium Carbonate as Fillers in Natural Rubber Compounding","authors":"Awatefe Kj, Idibie Ca, Olagbemiro To, O. Akaranta","doi":"10.31031/rdms.2020.13.000816","DOIUrl":"https://doi.org/10.31031/rdms.2020.13.000816","url":null,"abstract":"Natural rubber crumbs have always been the major input in rubber compounding, while reinforcing fillers such as carbon black, (CaCO3) and Kaolin are the conventional nonrenewable fillers used. Suitable replaceable fillers that are environmentally friendly, nonhealth hazard causing, and do not cause environmental pollution, that can replace the nonrenewable conventional filler, such as CBN330 are constantly being researched and sourced for [1]. The utilization of cocoa-pod husks and rubber seed shells as fillers in natural rubber compounding have been studied [2]. Equally, the mechanical properties of natural rubber reinforced by agricultural waste products have been evaluated [3]. Rice husks have been discovered as potential filler in epoxidized natural rubber [4]. Calcium Carbonate (CaCO3) has been studied as filler with flame retardant properties in Styrene-butadiene rubber [5]. Carbonized plantain peel has been investigated to substitute N330 Carbon black, to improve the cure characteristics, physico-mechanical and equilibrium swelling properties in natural rubber vulcanizates [6]. Rheological rubber compounded with blend of carbonized melon seed shell and carbon black has also been investigated [7]. Tensile strength properties of oil palm empty fruit Bunch-Polyurethane composite have been Studied [8].","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78280990","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

Recycling of Glass Waste in Ceramics-Part II: Microstructure of Ceramic Products using XRD, DTA and SEM Techniques 玻璃废料在陶瓷中的回收利用——第二部分:利用XRD、DTA和SEM技术分析陶瓷制品的微观结构

Research & Development in Material Science Pub Date : 2020-05-27 DOI: 10.31031/rdms.2020.13.000817

Darweesh Hhm

引用次数: 0

Study of the Physical Nature of the Electric Arc in Power Oil-Filled Transformers 电力充油变压器电弧物理性质的研究

Research & Development in Material Science Pub Date : 2020-05-15 DOI: 10.31031/rdms.2020.13.000815

Hruntovich Nv, Zhuk Ya

引用次数: 0