纳米粒子(英文)最新文献_第4页

Properties of Zinc Ferrite Nanoparticles Due to PVP Mediation and Annealing at 500°C PVP介导和500℃退火制备铁酸锌纳米颗粒的性能

纳米粒子(英文) Pub Date : 2019-05-27 DOI: 10.4236/ANP.2019.82003

D. O. Okoroh, J. Ozuomba, S. Aisida, P. Asogwa

{"title":"Properties of Zinc Ferrite Nanoparticles Due to PVP Mediation and Annealing at 500°C","authors":"D. O. Okoroh, J. Ozuomba, S. Aisida, P. Asogwa","doi":"10.4236/ANP.2019.82003","DOIUrl":"https://doi.org/10.4236/ANP.2019.82003","url":null,"abstract":"In contributing to the improvement of Ferrite Magnetic nanoparticles, the effects of Poly (Vinyl Pyrrolidone) (PVP) and annealing on the structural and magnetic properties of Zinc ferrite nanoparticles (ZFNPs) synthesis were investigated in this work. The effects were evaluated using the X-ray diffraction (XRD) spectroscopy, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Vi-brating sample magnetometer (VSM). The XRD analysis confirms a good formation of the inverse spinel crystal structure with an average particle size of 1.3 nm to 15.2 nm and from 1.6 nm to 21.1 nm for the ZFNPs as-prepared and PVP mediated ZFNPs for the un-annealed and annealed samples, respectively. The SEM image reveals an increase in the particle size for both the as-prepared and PVP mediated samples after annealing at 500°C. The FTIR also reveals the inverse spinel structure for the as-prepared and annealed samples, which witnesses a vibrational red shift towards a higher wave number for the annealed samples. The VSM analysis indicates the superparamagnetic behavior of PVP mediated and annealed sample with zero remanence magnetization (Mr) and Coercivity (Hc). The saturation magnetization (Ms) increases from 1.31 emu/g, for the as-prepared samples, to 4.31 emu/g after the annealing and from 1.18 emu/g, for the PVP mediated, to 6.38 emu/g after annealing. These effects have been attributed to the cationic re-arrangement on the lattice site after the annealing. This presents a superior material for various applications in nanotechnology.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49161351","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: 17

Fluorescent Superparamagnetic Core-Shell Nanostructures: Facile Synthesis of Fe@C-CNx Particles for Reusable Photocatalysts 荧光超顺磁核壳纳米结构:可重复使用光催化剂Fe@C-CNx颗粒的简单合成

纳米粒子(英文) Pub Date : 2019-01-29 DOI: 10.4236/ANP.2019.81001

S. Murugesan, O. Kuznetsov, Zhou Zhou, V. Khabashesku

{"title":"Fluorescent Superparamagnetic Core-Shell Nanostructures: Facile Synthesis of Fe@C-CNx Particles for Reusable Photocatalysts","authors":"S. Murugesan, O. Kuznetsov, Zhou Zhou, V. Khabashesku","doi":"10.4236/ANP.2019.81001","DOIUrl":"https://doi.org/10.4236/ANP.2019.81001","url":null,"abstract":"Synthesis and characterization of hybrid fluorescent superparamagnetic core-shell particles of Fe@C-CNx composition are presented for the first time. The prepared Fe@C-CNx hybrid nanoparticles were found to possess multifunctionality by exhibiting strong superparamagnetic properties and bright fluorescence emissions at 500 nm after the excitation with light in the UV-visible range. Fe@C-CNx also exhibits photocatalytic activities for organic dye degradation comparable to pure amorphous CNx with reusability through magnetic separation. The combination of magnetic and fluorescent properties of core-shell Fe@C-CNx nanoparticles opens opportunities for their application as sensors and magnet manipulated reusable photocatalysts. Superparamagnetic Fe@C core-shell nanoparticles were used as the template material in the synthesis, where the carbon shell was functionalized through one-step free-radical addition of alkyl groups terminated with carboxylic acid moieties. The method utilizes the organic acyl peroxide of dicarboxylic acid (succinic acid peroxide) as a non-oxidant functional free radical precursor for functionalization. Further, covalently functionalized succinyl-Fe@C core-shell nanoparticles were coated with the amorphous carbon nitride (CNx) generated by an in-situ solution-based chemical reaction of cyanuric chloride with lithium nitride. A detailed physicochemical characterization of the microstructure, magnetic and fluorescence properties of the synthesized hybrid nanoparticles is provided.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44573103","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

Utilisation of Green Synthesised Silver Nanoparticles for Water Quality Management 绿色合成银纳米粒子在水质管理中的应用

纳米粒子(英文) Pub Date : 2018-11-09 DOI: 10.4236/anp.2018.74007

P. Dhasarathan, N. Devi, P. Sangeetha, Suman Madhu G. Navaraj, A. Ranjitsingh, C. Padmalatha

引用次数: 3

Effect of LASER on the Synthesis of Gold Nanoparticles with Reference to Geometries 从几何结构看激光对金纳米粒子合成的影响

纳米粒子(英文) Pub Date : 2018-11-09 DOI: 10.4236/anp.2018.74006

S. Yadav, S. Prakash

{"title":"Effect of LASER on the Synthesis of Gold Nanoparticles with Reference to Geometries","authors":"S. Yadav, S. Prakash","doi":"10.4236/anp.2018.74006","DOIUrl":"https://doi.org/10.4236/anp.2018.74006","url":null,"abstract":"Problem Statement: In the current study the effort was being made to investigate the effect of LASER light on the shape and geometries of Gold Nanoparticles. Light is an important parameter that plays significant role in the formation of nanoparticles; in this study LASER lights of selected wavelengths and colors have been used for the exposure of Gold Nanoparticles. The possibilities to manipulate the geometries of Gold Nanoparticles by altering the colors and wavelengths of LASER have been studied with reference to their efficacy against Culex quinquefasciatus. Approach: In the experimental setup four black boxes are used with no exposure to light sources. Three LASER with selected wavelengths and colors were fixed in the boxes at a specific angle, and then the nanoparticle solution was allowed to react. The micrographs of the Gold nanoparticles have been evaluated through the Transmission Electron Microscope (TEM). Results: The TEM images have shown formation of different shapes of nanoparticles due to exposure in different colors and wavelengths of LASER. Thus it explains that the wavelength and colour of the light plays a decisive role in the formation of the shapes and geometries of the nanoparticles.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47282668","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

Fabrication, Visualization and Analysis of Fluorescein Sodium Encapsulated PLGA@CS Nanoparticles as Model for Photothermomechanical Drug Delivery Using Pulsed 532 nm Laser 荧光素钠包封PLGA@CS纳米粒子的制备、可视化及分析

纳米粒子(英文) Pub Date : 2018-08-31 DOI: 10.4236/anp.2018.73005

M. E. Khosroshahi, M. Mahmoodi

{"title":"Fabrication, Visualization and Analysis of Fluorescein Sodium Encapsulated PLGA@CS Nanoparticles as Model for Photothermomechanical Drug Delivery Using Pulsed 532 nm Laser","authors":"M. E. Khosroshahi, M. Mahmoodi","doi":"10.4236/anp.2018.73005","DOIUrl":"https://doi.org/10.4236/anp.2018.73005","url":null,"abstract":"PLGA/CS nanoparticles containing fluorescein sodium as drug model were synthesized and characterized to investigate the feasibility of laser-induced drug delivery using pulse 532 nm. The main objective was to investigate the photothermally-induced mechanical force for transporting the nanoparticles. An argon laser was used to excite the fluorescence of the samples after irradiation. The preliminary results indicated that the drug nanoparticles encapsulated trapped by the cavitation bubbles can be transported by photothermomechanical effect. Different regions of interactions are defined and while in our case, the thermoelastic does not apply due to higher fluences, vaporization and laser-induced thermal breakdown (LITB) including the plasma formation and shock waves played an important and major role. Threshold fluences of 2.8, 18 and 102 Jcm-2 corresponding to 0.28, 1.8 and 10 GWcm-2 and 3.8, 30, and 171 MPa are determined for ablation, vaporization and LITB mechanisms respectively. The secondary microbubbles due to explosion of the primary transient cavitation bubbles played a key role in delivery process. Despite the dominant argon laser brightness, the laser-induced fluorescence spectroscopy (LIFS) demonstrated the fluorescence emission of the cavitation bubbles carrying due to the drug nanoparticles entrapped within the biogelatin after exposure to laser radiation, the irradiation, which confirms the possibility of transport of drug nanoparticles by laser cavitation. Finally, it is suggested that the nature of such photothermal and photo non-thermal mechanical effects is governed and influenced by determining and criticizing in terms of the type of nanomaterial as well as their synthesis process engineering and fabrication as they can be made case sensitive by selecting different types of materials for a specific application.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41452688","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

Facile Synthesis Route of Au-Ag Nanostructures Soaked in PEG 聚乙二醇浸泡制备Au-Ag纳米结构的简便方法

纳米粒子(英文) Pub Date : 2018-07-06 DOI: 10.4236/anp.2018.72004

E. K. Fodjo, Ali Canlier, Cong Kong, A. Yurtsever, Pohan Lemeyonouin Aliou Guillaume, Fato Tano Patrice, M. Abe, T. Tohei, A. Sakai

引用次数: 2

Conditional Optimization of Solution Combustion Synthesis for Pioneered La2O3 Nanostructures to Application as Future CMOS and NVMS Generations 溶液燃烧合成La2O3纳米结构的条件优化，以应用于未来的CMOS和NVMS

纳米粒子(英文) Pub Date : 2018-02-28 DOI: 10.4236/ANP.2018.71003

Amanullakhan Pathan, Kavita Desai, Shailesh Vajapara, C. P. Bhasin

{"title":"Conditional Optimization of Solution Combustion Synthesis for Pioneered La2O3 Nanostructures to Application as Future CMOS and NVMS Generations","authors":"Amanullakhan Pathan, Kavita Desai, Shailesh Vajapara, C. P. Bhasin","doi":"10.4236/ANP.2018.71003","DOIUrl":"https://doi.org/10.4236/ANP.2018.71003","url":null,"abstract":"In the Mediterranean region, climate change will result by 2100 in a tempera-ture increase that most likely will range from 2°C to 2.7°C, while annual precip-itation will most likely reduce in the range of 3% to 10%. This paper uses hy-drological modeling of precipitation and evapotranspiration to evaluate the challenge to aquifer natural recharge considering Palestine as a case study. The study showed that the climate change impacts on aquifer recharge will vary according to the distributions of monthly precipitation and evapotranspiration in the recharge areas. The 2°C to 3°C increase in temperature could result in a reduction of 6% to 13% in aquifer annual recharge. Aquifer recharge was found to be sensitive to changes in precipitation as a reduction of 3% to 10% in annual precipitation could result in a reduction in annual recharge ranging from 3% to 25%. It was observed that aquifers with recharge areas characterized by lower precipitation are more sensitive to precipitation reduction and thus groundwater resources will be negatively impacted more in these areas by climate change. Thus, climate change will reduce water availability in drier areas requiring adaptation measures through improving water management and rehabilitation of water infrastructure.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41392057","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: 10

Effect of Cu2+ Doping on Structural and Optical Properties of Synthetic Zn0.5CuxMg0.5-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) Nano-Ferrites Cu2+掺杂对合成Zn0.5CuxMg0.5-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4)纳米铁氧体结构和光学性能的影响

纳米粒子(英文) Pub Date : 2018-02-22 DOI: 10.4236/ANP.2018.71001

Badawi M. Ali, M. Siddig, Yousef A. Alsabah, A. Elbadawi, A. I. Ahmed

{"title":"Effect of Cu2+ Doping on Structural and Optical Properties of Synthetic Zn0.5CuxMg0.5-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) Nano-Ferrites","authors":"Badawi M. Ali, M. Siddig, Yousef A. Alsabah, A. Elbadawi, A. I. Ahmed","doi":"10.4236/ANP.2018.71001","DOIUrl":"https://doi.org/10.4236/ANP.2018.71001","url":null,"abstract":"The samples of Zn0.5CuxMg0.5-xFe2O4 nanoparticle ferrites, with x= 0.0, 0.1, 0.2, 0.3, 0.4 were successfully synthesised. Structural and optical properties were investigated by X-ray Diffraction (XRD), Fourier Transform Infrared spectros-copy (FTIR) and UV-visible spectroscopy. The structural studies showed that all the samples prepared through the Co-precipitation method was a single phase of a face-cantered-Cubic (FCC) spinel symmetry structures with space group (SG): Fd-3m. In the series Zn0.5CuxMg0.5-xFe2O4, the lattice parameter was found to be 8.382 A for x = 0 and was found to increase with copper con-centration. The grain size obtained from the XRD data analyses was found to be in the range of 15.97 to 28.33 nm. The increased in the grain size may be due to the large ionic radius of Mg2+ (0.86 A) compared with Cu2+ (0.73 A). The FTIR spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 580, 1112, 1382, 1682, 1632 and 2920 cm-1. The energy band gap was calculated for samples were found to be in the range 4.04 to 4.67 eV.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48836019","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: 9

The Development and Characterization of Polycaprolactone and Titanium Dioxide Hybrids 聚己内酯与二氧化钛杂化材料的研制与表征

纳米粒子(英文) Pub Date : 2018-02-22 DOI: 10.4236/ANP.2018.71002

M. Monteiro, M. Tavares

{"title":"The Development and Characterization of Polycaprolactone and Titanium Dioxide Hybrids","authors":"M. Monteiro, M. Tavares","doi":"10.4236/ANP.2018.71002","DOIUrl":"https://doi.org/10.4236/ANP.2018.71002","url":null,"abstract":"Organic/Inorganic hybrid materials have been attracting much attention since they combine the advantages of inorganic materials with the properties of organic polymers. Titanium dioxide nanoparticles (TiO2) present good thermal stability, accessibility and catalytic properties. Polycaprolactone (PCL) is a bi-ocompatible and bioresorbable material, which is being examined as biode-gradable packaging materials, controlled drug release carriers and other medical applications. Hybrids based on PCL containing different amounts of titanium dioxide nanoparticles, ranging from 0.05% to 0.35% w/w, were prepared using the solution cast method. These systems were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), low-field nuclear magnetic resonance (NMR), thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The FTIR analysis confirmed that there was an interaction between the PCL chains and the TiO2 nanoparticles. The XRD and DSC analysis showed that the PCL crystallization was affected by TiO2 incorporation, modifying its semi-crystalline structure to a less ordered structure. When TiO2 nanoparticles were added the values of T1H and T1ρH increased for all hybrids, therefore, their addition produced a new material with less molecular mobility. In the TG analysis, it was observed that the introduction of TiO2 nanoparticles decreased the thermal resistance of PCL. In DSC analysis, the PCL/TiO2 hybrids presented a reduction in the crystallization temperature and degree of crystallinity, except for PCL hybrids containing 0.15% w/w of TiO2 nanoparticles.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45538029","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: 9

Water Based Nanofluids: A Computational Study on Temperature Distribution in a Pipe Flow 水基纳米流体：管流中温度分布的计算研究

纳米粒子(英文) Pub Date : 2017-10-16 DOI: 10.4236/ANP.2017.64012

Md. Ebrahim Khalil Bhuiyan, Mohammad Mahmudur Rahman Khan, Iqbal Mahmud

引用次数: 3