Indian Journal of Materials Science最新文献_第2页

DFT Study on the Carrier Concentration and Temperature-Dependent Thermoelectric Properties of Antimony Selenide 硒化锑载流子浓度及温度相关热电性质的DFT研究

Indian Journal of Materials Science Pub Date : 2016-05-25 DOI: 10.1155/2016/7296847

A. Jayaraman, A. B. Kademane, Muralikrishna Molli

{"title":"DFT Study on the Carrier Concentration and Temperature-Dependent Thermoelectric Properties of Antimony Selenide","authors":"A. Jayaraman, A. B. Kademane, Muralikrishna Molli","doi":"10.1155/2016/7296847","DOIUrl":"https://doi.org/10.1155/2016/7296847","url":null,"abstract":"We present the thermoelectric properties of Antimony Selenide (Sb2Se3) obtained using first principles calculations. We investigated the electronic band structure using the FP-LAPW method within the sphere of the density functional theory. Thermoelectric properties were calculated using BoltzTrap code using the constant relaxation time () approximation at three different temperatures 300 K, 600 K, and 800 K. Seebeck coefficient () was found to decrease with increasing temperature, electrical conductivity () was almost constant in the entire temperature range, and electronic thermal conductivity () increased with increasing temperature. With increase in temperature decreased from 1870 μV/K (at 300 K) to 719 μV/K (at 800 K), electronic thermal conductivity increased from 1.56 × 1015 W/m K s (at 300 K) to 3.92 × 1015 W/m K s (at 800 K), and electrical conductivity decreased from 22 × 1019/Ω m s (at 300 K) to 20 × 1019/Ω m s (at 800 K). The thermoelectric properties were also calculated for different hole concentrations and the optimum concentration for a good thermoelectric performance over a large range of temperatures (from 300 K to 1000 K) was found for hole concentration around 1019 cm−3.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"78 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2016-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81317937","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: 8

Microstructure Evolution and Grain Growth Model of AZ31 Magnesium Alloy under Condition of Isothermal 等温条件下AZ31镁合金组织演变及晶粒长大模型

Indian Journal of Materials Science Pub Date : 2015-12-30 DOI: 10.1155/2015/897686

Zhongtang Wang, Ling-Yi Wang, Lizhi Liu

引用次数: 2

Wear and Corrosion of Cast Al Alloy Piston with and without Brake Oil 使用和不使用刹车油的铸铝合金活塞的磨损和腐蚀

Indian Journal of Materials Science Pub Date : 2015-11-01 DOI: 10.1155/2015/763618

O. Ajibola, D. Oloruntoba

引用次数: 10

Effect of MgFeSi Inoculant on Properties of Cast 6061 Al Alloy for Brake Master Piston Application MgFeSi孕育剂对铸造6061铝合金制动总活塞性能的影响

Indian Journal of Materials Science Pub Date : 2015-10-18 DOI: 10.1155/2015/756219

O. Ajibola, D. Oloruntoba

引用次数: 10

Synthesis, Characterization, and Investigation of Visible Light Photocatalytic Activity of C Doped TiO2/CdS Core-Shell Nanocomposite C掺杂TiO2/CdS核壳纳米复合材料的合成、表征及可见光催化活性研究

Indian Journal of Materials Science Pub Date : 2015-10-05 DOI: 10.1155/2015/690568

A. Lavand, Y. S. Malghe, Suraj H. Singh

引用次数: 15

Thermoluminescence and Photoluminescence Study of Erbium Doped CaY2O4 Phosphor 掺铒CaY2O4荧光粉的热致发光和光致发光研究

Indian Journal of Materials Science Pub Date : 2015-09-30 DOI: 10.1155/2015/745052

V. Dubey, R. Tiwari, R. Tamrakar, Chandrabhushan Markande, G. Rathore, M. Pradhan

引用次数: 4

Influencing Parameters in the Photocatalytic Degradation of Organic Effluent via Nanometal Oxide Catalyst: A Review 纳米金属氧化物光催化降解有机废水的影响因素研究进展

Indian Journal of Materials Science Pub Date : 2015-09-17 DOI: 10.1155/2015/601827

A. Gnanaprakasam, V. Sivakumar, M. Thirumarimurugan

引用次数: 190

Mechanical Characterization and Machinability Behavior of Annealed AISI D6 Cold Working Steel 退火AISI D6冷加工钢的力学特性和可加工性行为

Indian Journal of Materials Science Pub Date : 2015-09-17 DOI: 10.1155/2015/196178

M. K. Nayak, R. Sehgal, R. Sharma

{"title":"Mechanical Characterization and Machinability Behavior of Annealed AISI D6 Cold Working Steel","authors":"M. K. Nayak, R. Sehgal, R. Sharma","doi":"10.1155/2015/196178","DOIUrl":"https://doi.org/10.1155/2015/196178","url":null,"abstract":"Tool steels in metal forming industry are exposed to complex and aggressive conditions due to multiple effects (mechanical, thermal, or tribological loading) and require defined mechanical properties. Also machining of tool steel with poor machinability like AISI D6 to manufacture form tools is an extremely difficult task. This paper investigates the microstructural, mechanical, and machining behavior of AISI D6 steel in annealed and hardened conditions. Various mechanical tests indicated good hardenability, improved surface hardness, and phenomenal improvement in tensile strength but extremely poor resistance to impact in both annealed and hardened condition for this steel. The machining characteristics of AISI D6 steel were evaluated using a 2k unreplicated full factorial design approach and statistical techniques have been used to assess and identify the significant factors, namely, cutting speed, feed, depth of cut, and approach angle, in minimizing surface roughness and main cutting force while machining this steel with a carbide tool. It was found that the depth of cut, feed, and approach angle are the most significant factors affecting the surface roughness and depth of cut and feed affect the main cutting force. Cutting speed has no effect on surface roughness and main cutting force in machining of the steel in annealed condition.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"3 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2015-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74203642","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: 11

Dynamics of Kaolinite-Urea Nanocomposites via Coupled DMSO-Hydroxyaluminum Oligomeric Intermediates 通过偶联dmso -羟基铝低聚中间体制备高岭石-尿素纳米复合材料的动力学研究

Indian Journal of Materials Science Pub Date : 2015-09-13 DOI: 10.1155/2015/920835

Siafu Ibahati Sempeho, H. Kim, E. Mubofu, A. Pogrebnoi, Godlisten N. Shao, A. Hilonga

{"title":"Dynamics of Kaolinite-Urea Nanocomposites via Coupled DMSO-Hydroxyaluminum Oligomeric Intermediates","authors":"Siafu Ibahati Sempeho, H. Kim, E. Mubofu, A. Pogrebnoi, Godlisten N. Shao, A. Hilonga","doi":"10.1155/2015/920835","DOIUrl":"https://doi.org/10.1155/2015/920835","url":null,"abstract":"Kaolinite-urea nanocomposites were prepared via intercalation reactions in an attempt to investigate the dynamic nature of kaolinite morphology for advanced applications in controlled release systems (CRS). Characterization was done using SEM-EDX, XRF, ATR-FTIR, XRD, and DT/DTG; Andreasen pipette sedimentation technique was used to determine the grain size distribution of the raw kaolinite. The X-ray diffraction pattern revealed the existence of an FCC Bravais lattice where the intercalation ratios attained were 51.2%, 32.4%, 7.0%, and 38.4% for hydroxyaluminum oligomeric intercalated kaolinite, substituted urea intercalated kaolinite, calcined DMSO intercalated kaolinite, and hydroxyaluminum reintercalated kaolinite, respectively, along with their respective crystallite sizes of 33.51–31.73 nm, 41.92–39.69 nm, 22.31–21.13 nm, and 41.86–39.63 nm. The outcomes demonstrated that the employed intercalation routes require improvements as the intercalation reactions were in average only ≈32.3%. The observations unveiled that it is possible to manipulate kaolinite structure into various morphologies including dense-tightly packed overlapping euhedral pseudo hexagonal platelets, stacked vermiform morphologies, postulated forms, and unique patterns exhibiting self-assembled curled glomeruli-like morphologies. Such a diversity of kaolinite morphologies expedites its advanced applications in the controlled release systems (CRS) such as drug delivery systems and controlled release fertilizers (CRFs).","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"13 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2015-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79524686","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: 5

Evaluation of Chitosan Based Polymeric Matrices for Sustained Stomach Specific Delivery of Propranolol Hydrochloride 壳聚糖基聚合物基质对盐酸心得安胃内缓释的评价

Indian Journal of Materials Science Pub Date : 2015-08-27 DOI: 10.1155/2015/312934

Juhi Dubey, A. Verma, N. Verma

{"title":"Evaluation of Chitosan Based Polymeric Matrices for Sustained Stomach Specific Delivery of Propranolol Hydrochloride","authors":"Juhi Dubey, A. Verma, N. Verma","doi":"10.1155/2015/312934","DOIUrl":"https://doi.org/10.1155/2015/312934","url":null,"abstract":"The objective of the present investigation was to explore the potential of Chitosan based polymeric matrices as carrier for sustained stomach specific delivery of model drug Propranolol Hydrochloride. Briefly, single unit hydrodynamically balanced (HBS) capsule formulations were prepared by encapsulating in hard gelatin capsules, intimately mixed physical mixtures of drug, and cationic low molecular weight Chitosan (LMCH) in combination with either anionic medium viscosity sodium alginate (MSA) or sodium carboxymethylcellulose (CMCNa). The effect of incorporation of nonionic polymers, namely, tamarind seed gum (TSG) and microcrystalline cellulose (MCCP), was also investigated. It was observed that HBS formulations remained buoyant for up to 6 h in 0.1 M HCl, when LMCH : anionic/nonionic polymer ratio was at least 4 : 1. It was also observed that LMCH has formed polyelectrolyte complex (PEC) with MSA (4 : 1.5 ratio) and CMCNa (4 : 1 ratio) in situ during the gelation of HBS formulations in 0.1 M HCl. The retardation in drug release was attributed to the PEC formation between LMCH and MSA/CMCNa. Incorporation of MCCP (rapid gel formation) and TSG (Plug formation) was found to be innovative. From the data, it is suggested that Chitosan based polymeric matrices may constitute an excellent carrier for stomach specific drug delivery.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"44 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2015-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72649085","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: 14