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International Journal of Nanoparticles最新文献

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Greener synthesis of silver nanoparticle from Chordia dichotoma leaf extract and its antimicrobial activity 二分草叶提取物绿色合成纳米银及其抗菌活性
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007148
P. Kalainila, R. Ravindran, V. Hemachandran, S. Renganathan
{"title":"Greener synthesis of silver nanoparticle from Chordia dichotoma leaf extract and its antimicrobial activity","authors":"P. Kalainila, R. Ravindran, V. Hemachandran, S. Renganathan","doi":"10.1504/IJNP.2017.10007148","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007148","url":null,"abstract":"Greener synthesis of silver nanoparticles (AgNPs) using the leaf extract of Chordia dichotoma. After the addition of leaf extract into the silver nitrate solution the colour change was observed that clearly confirms the formation of AgNPs. The synthesised AgNPs undergo the surface plasmon resonance (SPR) effect for the size reductions were confirmed by the formation of peak at 431 nm from UV-visible spectroscopy (UV-Vis). The stability of the nanoparticles were studied at different time interval (0 to 72 h) using UV-visible spectroscopy and found to be stable. FTIR analysis was performed to identify the active biomolecules that were responsible for the reduction of AgNPs. The synthesised particles were found to be spherical in shape and are in the average size range to nm and were observed to be monodispersed hence it proves that the particles were stable.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"132"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42503429","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
Electrical properties of nanoscale field effect transistor 纳米级场效应晶体管的电学特性
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007133
Sana Kausar, S. Joshi
{"title":"Electrical properties of nanoscale field effect transistor","authors":"Sana Kausar, S. Joshi","doi":"10.1504/IJNP.2017.10007133","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007133","url":null,"abstract":"In this paper structure of a H-passivated silicon nanowire along [111] direction with hexagonal cross section is defined by using Virtual nanolab (VNL), and set up a nanoscale field effect transistor (FET) structure with a wrap-around gate. Then the transmission spectrum and conductance is computed as the gate bias is varied. The device characteristic curve and conductance with respect to gate voltage is studied. Also, the effect of doping of Al atom on characteristic curve and conductance of nanoscale field effect transistor is analysed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"111"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47600848","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
Biosynthesis of silver nanoparticles using unriped Carica papaya fruit extract with different PH conditions 不同PH条件下未熟番木瓜果实提取物生物合成纳米银
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007132
Hooi Chien Ng, C. Khe, A. Aziz, Z. Merican, R. Sokkalingam, T. Chew, C. Lai
{"title":"Biosynthesis of silver nanoparticles using unriped Carica papaya fruit extract with different PH conditions","authors":"Hooi Chien Ng, C. Khe, A. Aziz, Z. Merican, R. Sokkalingam, T. Chew, C. Lai","doi":"10.1504/IJNP.2017.10007132","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007132","url":null,"abstract":"Silver nanoparticles were successfully synthesised at room temperature from silver nitrate using unripe Carica papaya fruit extract as a reducing and capping agent. PH of the reaction solution was adjusted with the addition of sodium hydroxide from pH 5.6 (original pH of the broth) to pH 6.5, pH 7.5 and pH 8.5. Quasi spherical silver nanoparticles were obtained across the studied pH range. The average particle size obtained decreased from 34 nm to 15 nm as the pH of the solution increased from 5.6 to 8.5. From the observations and ultra violet-visible spectrophotometer analysis, the rate of reduction and formation of silver nanoparticles increased as the pH increased. The crystalline nature of the as-synthesised silver nanoparticles in a cubic structure was confirmed by the peaks in X-ray diffraction and selected area electron diffraction. From Fourier transform infrared spectra, it was found that proteins in unripe papaya fruit extract were strongly bounded to the surface of silver nanoparticles as a capping agent. The thin layer of protein coating also further confirmed under high resolution transmission electron microscope. A plausible formation mechanism has been briefly proposed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"55"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45493602","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
Structural transformation of polymeric and cationic capped zirconia nanoparticles with temperature 聚合物和阳离子包覆氧化锆纳米颗粒随温度的结构转变
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007135
S. R. Mohan, A. Maheswari, M. Sivakumar
{"title":"Structural transformation of polymeric and cationic capped zirconia nanoparticles with temperature","authors":"S. R. Mohan, A. Maheswari, M. Sivakumar","doi":"10.1504/IJNP.2017.10007135","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007135","url":null,"abstract":"The phase transformation mechanisms of zirconia nanocrystals obtained on thermal treatment of polyvinylpyrrolidone (PVP) and cetyltrimethylammoniumbromide (CTAB) capped hydrous amorphous zirconia (HAZ) on thermal treatment are investigated. In PVP assisted synthesis, tetragonal zirconia nanoparticles formation is the predominant one as compared to CTAB assisted synthesis. The decomposition of surfactants capped on HAZ with temperature (526°C for PVP and 466°C for CTAB) and subsequent interaction of the by-products with zirconia nanoparticles are responsible for tetragonal to monoclinic phase transformation. The decomposition temperature of capped surfactants is observed from thermogravimetric analysis (TGA) and subsequent interaction of by-products with zirconia nanoparticles at different temperatures is investigated from FTIR spectra. Further the structure of nanoparticles annealed at different temperatures is investigated using XRD, micro Raman and photoluminescence (PL) analysis.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"88"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46183794","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
Microalgae harvesting of Nannochloropsis sp. Using polyethersulphone/lithium chloride/functionalised multiwall carbon nanotube membranes fabricated via temperature induced phase inversion and non-solvent induced phase inversion Nannochloropsis sp.的微藻收获。使用聚醚砜/氯化锂/通过温度诱导相转化和非溶剂诱导相转化制备的功能化多壁碳纳米管膜
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.086133
Nur Farahah Mohd Khairuddin, A. Idris, M. Irfan, Teo Chee Loong
{"title":"Microalgae harvesting of Nannochloropsis sp. Using polyethersulphone/lithium chloride/functionalised multiwall carbon nanotube membranes fabricated via temperature induced phase inversion and non-solvent induced phase inversion","authors":"Nur Farahah Mohd Khairuddin, A. Idris, M. Irfan, Teo Chee Loong","doi":"10.1504/IJNP.2017.086133","DOIUrl":"https://doi.org/10.1504/IJNP.2017.086133","url":null,"abstract":"Microalgae are a promising renewable source especially for producing biofuels and other high value products. Biofuel and biomass production involves several steps from cultivation, harvesting and extraction. Recent technology has used ultrafiltration membrane for microalgae harvesting but are faced with adverse effect of microalgae fouling. In the present study, Nannochloropsis sp. harvesting was performed using an ultrafiltration hybrid membrane made of polyethersulphone (PES) blended with the two additives namely lithium chloride (LiCl) and functionalised multiwall carbon nanotube (F-MWCNT). The membranes were prepared via two methods; non-solvent induced phase separation (NIPS) and temperature induced phase separation (TIPS). The membrane performances were evaluated in terms of membrane flux and fouling for the use of microalgae harvesting. The FESEM analysis showed that the morphology of the hybrid PES-MWCNT-LiCl membranes was very much influenced by the phase separation method. Flux rates of the membranes improved dramatically with increasing amount of additives when prepared using TIPS. A 100% microalgae separation from cultivated solution without major fouling (more than 80% flux recovery) was successfully achieved.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"71-87"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2017.086133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47895468","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: 3
Structural and electrical studies of Mn-Ni mixed nanoferrites Mn-Ni混合纳米铁氧体的结构与电学研究
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007143
E. Devi, I. Soibam
{"title":"Structural and electrical studies of Mn-Ni mixed nanoferrites","authors":"E. Devi, I. Soibam","doi":"10.1504/IJNP.2017.10007143","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007143","url":null,"abstract":"Mn-Ni mixed spinel nanoferrites with varying nickel concentration (0.1, 0.2, 0.3, 0.4, and 0.5) were prepared by co-precipitation method. The spinel phase formation was confirmed by XRD and FTIR. Microstructure and compositional analysis were done by SEM and EDX respectively. Room temperature dielectric properties, resistivity and AC-conductivity were studied. The nanoferrites possess a very high dielectric constant. Dielectric loss tangent decreases with increase in nickel concentration and a broad peak appears for higher nickel concentration (0.2, 0.3, 0.4 and 0.5). Variation in DC-resistivity with nickel concentration goes in agreement with the variation of dielectric constant. Frequency variation of AC-conductivity for different nickel concentration shows dispersion at higher frequencies for different Ni concentration. Conduction mechanism has been explained on the basis of hopping electron model of ferrites.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"120"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352721","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: 7
Production of nano structure iron powder from blue dust 用蓝尘制备纳米结构铁粉
International Journal of Nanoparticles Pub Date : 2017-08-29 DOI: 10.1504/IJNP.2017.10007139
Kamlesh Kumar
{"title":"Production of nano structure iron powder from blue dust","authors":"Kamlesh Kumar","doi":"10.1504/IJNP.2017.10007139","DOIUrl":"https://doi.org/10.1504/IJNP.2017.10007139","url":null,"abstract":"One of the great triumphs in the field of nano materials and metal by nano technology is the success in developing of nano sized iron powder from iron ore concentrate (blue dust). NMDC has taken an initiative to utilise high-grade blue dust to produce value added product, i.e., nano structure iron powder (NSIP), which can fetch high value. After the up gradation of blue dust by physical method, the samples were leached by acid to produce value added product from blue dust. This was followed by leaching, precipitation, drying, reduction, grinding in argon atmosphere and characterised by SEM, XRD etc to confirm its nano character. This value added product having less than 100 nanometres size has its applications in computer engineering, electronics, instrument making, medicine, catalysis etc. Component made from nano structured materials have attracted large attention due to their high strength, excellent functional properties, better corrosion resistance, reduced sintering temperatures, etc. Paper contains preparation of nano sized particles (less than 100 nanometres) is connected to influence the dimensional effect on their physical, chemical, mechanical and other properties.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"9 1","pages":"101"},"PeriodicalIF":0.0,"publicationDate":"2017-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44888962","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
Growth of carbon nanotubes using low pressure chemical vapour deposition 利用低压化学气相沉积法生长碳纳米管
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028733
S. Habib
{"title":"Growth of carbon nanotubes using low pressure chemical vapour deposition","authors":"S. Habib","doi":"10.1504/IJNP.2009.028733","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028733","url":null,"abstract":"A low pressure chemical vapour deposition method is employed to fabricate iron catalysed carbon nanotubes. The iron catalyst is deposited on silicon substrate using a thermal evaporation method. The reactive gas mixture is C2H2/H2 with a flow rate of 50/50 sccm. The chamber pressure and temperature are maintained at 5 torr and 800°C respectively. The growth time is fixed at 15 minutes. It is evident from the SEM images of these carbon nanotubes that their diameter varies from 20 nm to 50 nm and the length of these nanotubes is of the order of several microns. TEM images suggest that these nanotubes are multi-walled and show an ordinary structure of carbon nanotubes. The growth mechanism of these nanotubes is also discussed.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"46-50"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028733","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769845","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
Simple approach for the synthesis of zinc oxide nanorods 氧化锌纳米棒的简单合成方法
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028738
M. A. Shah, M. Al-Shahry, Abdullah M. Asiri
{"title":"Simple approach for the synthesis of zinc oxide nanorods","authors":"M. A. Shah, M. Al-Shahry, Abdullah M. Asiri","doi":"10.1504/IJNP.2009.028738","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028738","url":null,"abstract":"For the first time, a simple and novel approach has been described for the preparation of zinc oxide nanorods by a simple reaction of zinc metal with water in the temperature range of 50°C-200°C. The diameters of the nanorods are in the range 30 nm to 100 nm with several micrometers in length. The influence of the reaction temperature on the morphologies has been discussed in detail. A plausible mechanism is proposed for the formation of these nanorods and is expected that this synthetic technique can be extended to obtain other metal oxides. The reported method is new, cheap, fast, environmentally benign and free of pollution, which will make it suitable for large scale production.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"66-73"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028738","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769920","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
Electrical transport properties of ZnO nanostructures ZnO纳米结构的电输运性质
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028740
I. Uddin, M. Rafat, K. Tripathi, M. Husain, Shamshad A Khan, S. M. El-Hamidy, Z. Khan
{"title":"Electrical transport properties of ZnO nanostructures","authors":"I. Uddin, M. Rafat, K. Tripathi, M. Husain, Shamshad A Khan, S. M. El-Hamidy, Z. Khan","doi":"10.1504/IJNP.2009.028740","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028740","url":null,"abstract":"A physical vapour condensation method is used to synthesise the nanostructures of ZnO. These nanostructures are fabricated by resistive heating of Zn powder at a temperature of 400°C in the presence of oxygen and argon gases under a vacuum of order of 10−6 mbar. The transmission electron microscope (TEM) images suggest that these nanostructures have some mixed morphology. They contain nanorods as well as nanoparticles. The typical diameter of these nanorods is in the range of 80 nm to 150 nm and the length is of the order of several hundreds of nanometers, whereas the size of the nanoparticles varies from 50 nm to 80 nm. Temperature dependence of dc conductivity of these ZnO nanostructures is also studied in the temperature range (303 K to 573 K). It is found that the experimental data gives a good fit for thermally activated process. Therefore, it is suggested that thermally activated process is responsible for the transport in these nanostructures.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"81-88"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028740","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769968","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
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