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International Journal of Nanoparticles最新文献

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New non-linear electrical-thermal switching of carbon nanoparticles/silane coupling agent reinforced phenolic resin nanocomposites 纳米碳/硅烷偶联剂增强酚醛树脂纳米复合材料的新型非线性电热开关
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028741
F. El-Tantawy, N. A. Aal, A. A. Al-Ghamdi, E. El-Mossalamy, S. Al-Heniti
{"title":"New non-linear electrical-thermal switching of carbon nanoparticles/silane coupling agent reinforced phenolic resin nanocomposites","authors":"F. El-Tantawy, N. A. Aal, A. A. Al-Ghamdi, E. El-Mossalamy, S. Al-Heniti","doi":"10.1504/IJNP.2009.028741","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028741","url":null,"abstract":"This paper evaluates the use of a new multifunctional conducting polymer containing phenolic resin reinforced by carbon black (CB) nanoparticles modified by silane coupling agent to produce positive temperature coefficient (PTC) thermistors and switching current. The percolation threshold of the conducting composites at room temperature was found to be as low as 4 wt% of CB. Temperature dependent electrical characterisation of phenolic resin/CB nanocomposites is performed. The composites exhibit PTC properties with ρmax/ρmin value as great as 104. Electrical parameters such as charge carriers type, drift mobility, concentration of charge carriers, activation and hopping energy are verified with CB content. The current-voltage curves of the nanocomposites change from linear to non-linear behaviour and the switching current is observed within the non-linear regime.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"89-99"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769980","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
Studies on ZnO nanorods ZnO纳米棒的研究
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028747
K. Tripathi, M. Husain, N. Salah, S. Habib, S. M. El-Hamidy, N. Zahed, Z. Khan
{"title":"Studies on ZnO nanorods","authors":"K. Tripathi, M. Husain, N. Salah, S. Habib, S. M. El-Hamidy, N. Zahed, Z. Khan","doi":"10.1504/IJNP.2009.028747","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028747","url":null,"abstract":"Nanorods of ZnO are synthesised using thermal evaporation method. In this method, Zn powder is evaporated at a temperature of 400°C in the presence of oxygen and argon gases. The crystallinity of these ZnO nanorods is studied using XRD. The XRD pattern suggests that these as-grown nanorods are crystalline and diffraction pattern are indexed to a typical wurtzite structure. This agrees well with the reported data (JCPDS card no. 36-1451). It is clear from the transmission electron microscope (TEM) images that the diameter of these nanorods varies from 20 nm to 70 nm and their length is of the order of several hundred nanometers. The UV-Vis spectra show a broad peak at 379 nm, which is a characteristic of ZnO.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"148-155"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770116","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
Optical properties of thiol-stabilised CdTe nanoparticles 巯基稳定碲化镉纳米粒子的光学性质
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028730
M. El-sadek, J. R. Kumar, S. M. Babu
{"title":"Optical properties of thiol-stabilised CdTe nanoparticles","authors":"M. El-sadek, J. R. Kumar, S. M. Babu","doi":"10.1504/IJNP.2009.028730","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028730","url":null,"abstract":"Thiol-capped CdTe nanocrystals with cubic zinc blende structure were synthesised in aqueous solution by wet chemical route and microwave assisted method. A series of cadmium telluride (CdTe) nanoparticles capped with mercaptoacetic acid were prepared using different pH values. The synthesised nanoparticles have been characterised with Raman, FT-IR, ultraviolet visible (UV-Vis) absorption, fluorescence spectroscopy and X-ray powder diffraction (XRD) studies.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"20-29"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028730","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769794","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
Synthesis of nanostructured ZnO and ZnO2 by laser ablation process using third harmonic of Nd:YAG laser Nd:YAG激光三次谐波烧蚀法制备纳米ZnO和ZnO2
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028744
M. Gondal, Z. Yamani, Q. Drmosh, A. Rashid
{"title":"Synthesis of nanostructured ZnO and ZnO2 by laser ablation process using third harmonic of Nd:YAG laser","authors":"M. Gondal, Z. Yamani, Q. Drmosh, A. Rashid","doi":"10.1504/IJNP.2009.028744","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028744","url":null,"abstract":"A laser-based method was developed for synthesis of nanostructured ZnO/ZnO2 using nanosecond pulsed laser ablation (PLA) on a metallic zinc target in water. Typical laser pulse energy for PLA process was between 40-130 milli-joules per pulse. The addition of an oxidising agent enhanced the nanoparticle yield by 100% and reduced the grain size drastically. A variety of analysis techniques were applied for the characterisation of products. To the best of our knowledge, this is the first time ZnO2 (zinc peroxide) having grain size of 5 nm are produced using laser ablation.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"119-128"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028744","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770048","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: 15
Nanofluids forced convection heat transfer inside circular tubes 纳米流体在圆管内强制对流换热
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028749
M. Ali, O. Zeitoun
{"title":"Nanofluids forced convection heat transfer inside circular tubes","authors":"M. Ali, O. Zeitoun","doi":"10.1504/IJNP.2009.028749","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028749","url":null,"abstract":"Two-dimensional turbulent convective heat transfer behaviour of alumina (Al2O3) nanoparticle dispersion in water flow in a horizontal circular pipe at constant wall temperature is investigated numerically. The computational procedure is based on the finite-volume technique. Three stream velocities corresponding to 5,000 < Re < 4 × 106 and five different concentrations of nanoparticle (0%, 1%, 2%, 4% and 6%) are studied. The full range of flow at the entrance length and the fully developed are considered. The shear stress are observed to increase at any x station along the pipe as the concentration of nanoparticle increase and it attains its higher value at the beginning of the pipe at the entrance region and then drops to an asymptotic value at the fully developed region. However, the case is reversed for Nusselt numbers along the pipe wall where they decrease as the concentration increase at each specific velocity value and in general as the velocity increases both Nusselt number and the shear stress increase. Different envelopes are obtained for Nusselt numbers and the shear stress in terms of Reynolds number. Finally, Reynolds number is observed to decrease as the concentration increase at fixed inlet velocity.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"164-172"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028749","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770175","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: 13
I-V characteristics of multi-walled carbon nanotubes synthesised using ECR-CVD ECR-CVD法合成多壁碳纳米管的I-V特性
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028736
K. Tripathi, M. Husain, M. Zulfequar, Z. Khan
{"title":"I-V characteristics of multi-walled carbon nanotubes synthesised using ECR-CVD","authors":"K. Tripathi, M. Husain, M. Zulfequar, Z. Khan","doi":"10.1504/IJNP.2009.028736","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028736","url":null,"abstract":"Multi-walled carbon nanotubes (MWCNTs) are synthesised at a temperature of 650°C and 700°C by electron cyclotron resonance plasma chemical vapour deposition (ECR-CVD). These MWCNTs have been grown on Si substrate using a thin film of Fe as a catalyst, which is coated by RF-sputtering. Acetylene is used as a source of carbon and plasma was created by argon gas. Ammonia is used to etch away amorphous carbon produced by plasma exposure. From the SEM image, it was observed that the length and diameter of MWCNTs varies from 70 nm to 150 nm and 35 nm to 40 nm respectively. The I-V characteristics have been performed by two-probe method under a vacuum of 10−3 torr at room temperature. On the basis of I-V characteristics, it is concluded that these CNTs show the semiconducting behaviour at all the temperatures.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"58-65"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028736","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769873","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
Potential application of nanotechnology in water production systems 纳米技术在水生产系统中的潜在应用
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028728
I. Al-Mutaz, F. A. A. El-Aleem, A. Al-Arifi
{"title":"Potential application of nanotechnology in water production systems","authors":"I. Al-Mutaz, F. A. A. El-Aleem, A. Al-Arifi","doi":"10.1504/IJNP.2009.028728","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028728","url":null,"abstract":"Nanotechnology covers a broad range of applications making it as the most important technology of the 21st century. Its significant application in water is of special interest to Arab countries due to water challenge problem in these arid areas. The application of novel technologies like nanomaterials or 'nanomembranes' can reduce effectively the water production cost and help in reducing certain operational problems like fouling and scale. Moreover, nanotechnology can be utilised to increase water resources of the Kingdom. In the present paper, the potential applications of nanotechnology in water production systems like nanofiltration for water treatment, water desalination as pretreatment, its hybridisation with reverse osmosis membranes or multistage flash process (MSF), its extensive use in detoxification of harmful polluted water, nanosensors for contaminants detection in water and novel magnetic nanoparticles for water desalination are critically reviewed and discussed. The Kingdom's experience of nanotechnology in MSF desalination plants will be emphasised.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"2-10"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028728","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769749","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
Effects of milling time on the formation of nanocrystalline ZnO 铣削时间对ZnO纳米晶形成的影响
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028735
O. Lemine, A. Alyamani, M. Bououdina
{"title":"Effects of milling time on the formation of nanocrystalline ZnO","authors":"O. Lemine, A. Alyamani, M. Bououdina","doi":"10.1504/IJNP.2009.028735","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028735","url":null,"abstract":"The effects of milling times on the mechanically milled ZnO powder are presented in this work. The milled powders are analysed by X-ray diffraction (XRD) and scanning electron microscope (SEM). In order to quantify these effects, analysis by the Rietveld method is carried out. It is shown that the application of mechanical milling is a simple technique to produce nanocrystalline powder. A clear reduction of grain size with an increase of microstrain and lattice parameters is observed with increasing milling time.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"238-243"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028735","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769865","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
Synthesis and characterisation of ZnO nanoparticles ZnO纳米颗粒的合成与表征
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028745
K. Tripathi, M. Husain, M. Zulfequar, S. Habib, Z. Khan
{"title":"Synthesis and characterisation of ZnO nanoparticles","authors":"K. Tripathi, M. Husain, M. Zulfequar, S. Habib, Z. Khan","doi":"10.1504/IJNP.2009.028745","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028745","url":null,"abstract":"A physical vapour condensation method is used to synthesise the nanoparticles of ZnO. The size of these nanoparticles varies from 40 nm to 100 nm. Mostly, these nanoparticles are spherical in shape but contain some impurities. The XRD data shows a sharp peak at 36.87°, which is very close to that of zinc oxide nanoparticles grown by oxidation in the presence of ambient gases i.e., oxygen mixed with argon. From UV visible spectra of these nanoparticles, a peak at 381 nm and 373 nm is observed. The broad peak at 373 nm is responsible for the conversion of zinc into zinc oxide.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"129-137"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028745","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770090","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
Alkaline earth oxide supported nano-gold catalysts: influence of support, preparation method and calcination temperature of catalyst on its gold particle size and morphology 碱土氧化物负载的纳米金催化剂:载体、制备方法和催化剂煅烧温度对其金粒度和形貌的影响
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028729
V. Choudhary, P. Jana, S. Bhargava
{"title":"Alkaline earth oxide supported nano-gold catalysts: influence of support, preparation method and calcination temperature of catalyst on its gold particle size and morphology","authors":"V. Choudhary, P. Jana, S. Bhargava","doi":"10.1504/IJNP.2009.028729","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028729","url":null,"abstract":"Influence of the metal oxide support, method of gold deposition and calcination temperature on the size and morphology of the nano-size gold particles deposited on alkaline earth metal oxides has been investigated. A number of alkaline earth oxide (viz. Mgo, CaO, SrO or BaO) supported nano-gold catalysts were prepared by depositing gold on the support by the deposition precipitation (DP) and homogeneous deposition precipitation (HDP) methods. The catalysts were calcined at different temperatures (400°C-900°C). The catalysts were characterised for their Au particles (size and morphology) using TEM/HRTEM. The catalytic activity of the supported nano-gold catalysts in the epoxidation of styrene to styrene oxide by tertiary butyl hydroperoxide could be correlated well with the Au loading and/or Au particle size of the catalysts.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"11-19"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028729","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769756","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
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