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Formation and Growth of Silver Nanocubes upon Nanosecond Pulsed Laser Irradiation: Effects of Laser Intensity and Irradiation Time 纳米秒脉冲激光辐照下银纳米立方体的形成和生长：激光强度和辐照时间的影响
纳米粒子(英文) Pub Date : 2017-10-16 DOI: 10.4236/ANP.2017.64013
U. Qazi, Z. Shervani, R. Javaid, S. Kajimoto, H. Fukumura
{"title":"Formation and Growth of Silver Nanocubes upon Nanosecond Pulsed Laser Irradiation: Effects of Laser Intensity and Irradiation Time","authors":"U. Qazi, Z. Shervani, R. Javaid, S. Kajimoto, H. Fukumura","doi":"10.4236/ANP.2017.64013","DOIUrl":"https://doi.org/10.4236/ANP.2017.64013","url":null,"abstract":"Silver nanoparticles (AgNPs) were fabricated by repetitive irradiation of near ultraviolet (UV) nanosecond laser pulses (355 nm, 5 ns) in an aqueous solution of silver nitrate in the absence of stabilizing agents. A broad absorption peak was observed in the visible region showing the formation of a variety of AgNPs in the solution. Among the variety of products, it was found that silver nanocubes (AgNCs) grew in size with longer laser irradiation time. The size of AgNCs also increased with higher laser intensity. The average size of AgNCs, investigated by a scanning electron microscope (SEM) was in the range of 75 - 200 nm. The number of reduced atoms in AgNCs as a function of laser intensity showed that the AgNCs are apparently produced by a four photon process, implying that the formation of dimer silver atoms is essential for the formation.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"148-157"},"PeriodicalIF":0.0,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42189286","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
Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide 利用天然多糖制备镁石碳酸钙及其稳定性研究
纳米粒子(英文) Pub Date : 2017-10-16 DOI: 10.4236/ANP.2017.64014
M. E. Saraya, Hanaa Hassan Abdel Latif Rokbaa
{"title":"Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide","authors":"M. E. Saraya, Hanaa Hassan Abdel Latif Rokbaa","doi":"10.4236/ANP.2017.64014","DOIUrl":"https://doi.org/10.4236/ANP.2017.64014","url":null,"abstract":"This paper aimed to study the effects of natural polysaccharide (gum arabic, GA) on the formation of vaterite calcium carbonate and its stability in aqueous solution. Gum arabic is a macromolecule that has a high molecular weight and is amphoteric in character. A 0, 2.5, 5 or 10 ml of GA solution (30%) was added to the calcium chloride solution with various initial concentrations to prepare the vaterite calcium carbonate. The calcium carbonate particles were characterized using FTIR, XRD, SEM, TEM and DSC-TG as well as calculation of phase contents. The results of XRD and FTIR analysis were showing that the presence of GA during the precipitation changes the behavior of calcium carbonate to form vaterite until at lower dose used. In addition, the molar content of vaterite increased at the expense of content of calcite with increasing the GA dose. There are slightly improvements in the vaterite content by increasing the initial concentration. The formed vaterite calcium carbonates composed of aggregates as broccoli-like or spherical shape and with particle size 1.6 - 2.5 μm in diameter. TEM images showed that these aggregates composed of the sub spherical unit with diameter 15 - 30 nm. The thermal behavior of prepared vaterite was conformed the mineral composition of these phases. The prepared calcium carbonate, which is formed in the presence of different doses of gum, has a stability in the aqueous solutions at different temperatures, as the analyzes indicated that a very small percentage of the vaterite were converted to calcite. The gum arabic prevented or depressed the transformation of vaterite to calcite through capped the surface of particles, i.e. it is more effective in stabilizing the vaterite phase with increasing in initial concentration and time.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"158-182"},"PeriodicalIF":0.0,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44664112","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: 20
Boosted Photoactivity of Titania Nanotube Layers Doped with a Suspension of Gold Nanoparticles 金纳米粒子悬浮液增强二氧化钛纳米管层的光活性
纳米粒子(英文) Pub Date : 2017-08-08 DOI: 10.4236/ANP.2017.63010
C. Massard, S. Pairis, Y. Sibaud, Christelle Blavignac, O. Awitor
{"title":"Boosted Photoactivity of Titania Nanotube Layers Doped with a Suspension of Gold Nanoparticles","authors":"C. Massard, S. Pairis, Y. Sibaud, Christelle Blavignac, O. Awitor","doi":"10.4236/ANP.2017.63010","DOIUrl":"https://doi.org/10.4236/ANP.2017.63010","url":null,"abstract":"In the present work, we report on the behavior of synthesized gold nano-particles suspension, incorporated in titanium dioxide nanotube layers (TiO2- NT) and fabricated by electrochemical anodization in 0.4 wt% hydrofluoric acid solution and we study its photocatalytic response. Gold nanoparticles were characterized using Transmission electron microscopy and X-ray diffraction. Scanning electron microscopy was used to study the morphology of TiO2 nanotube layers doped by gold nanoparticles. Boosted photocatalytic performances on the degradation of an azo dye were obtained by using TiO2 nanotube layers doped by gold nanoparticles (Au/TiO2-NT), compared to undoped TiO2 nanotube layer (TiO2-NT) catalysts. Under UV irradiation, this new nanomaterial, with noble metal-semi conductor heterojunction (Au/ TiO2-NT) exhibits a synergetic effect in accelerating the electron transfert, resulting in an enhanced photoactivity recorded in the kinetics of degradation of Acid Orange 7 (AO7). Chronoamperometry was used to highlight higher photocurrent produced by gold-titania interface submited to UV irradiation.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"114-127"},"PeriodicalIF":0.0,"publicationDate":"2017-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42837175","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
Nanotechnology in Diagnosis: A Review 纳米技术在诊断中的应用综述
纳米粒子(英文) Pub Date : 2017-08-03 DOI: 10.4236/ANP.2017.63008
T. C. Jackson, B. Patani, D. Ekpa
{"title":"Nanotechnology in Diagnosis: A Review","authors":"T. C. Jackson, B. Patani, D. Ekpa","doi":"10.4236/ANP.2017.63008","DOIUrl":"https://doi.org/10.4236/ANP.2017.63008","url":null,"abstract":"The fast pace of today’s world has presented several challenges in the area of healthcare. Depression, hypertension, diabetes, cancers and several infectious diseases are just some of the common outcomes associated with the high speed stress-filled lifestyle. Early diagnosis has been the goal for prompt arrest and management of these health conditions. This has been a challenge in recent times. However, great scientific advancement with improved potential in medical diagnosis has equally been a giant stride in times like these. Early disease detection even before symptoms’ presentation, improved imaging of internal body structure, as well as ease of diagnostic procedures, have been developed with the help of a new branch of laboratory medicine termed nanodiagnostics. Use of microchips, biosensors, nanorobots, nano identification of single celled structures, and microelectromechanical systems are current techniques being developed for use in nanodiagnostics. This piece of write up takes a panoramic view of available nanotechnological advances in current use for medical diagnosis and projecting into future possibilities and potentials for an improved health care delivery.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"93-102"},"PeriodicalIF":0.0,"publicationDate":"2017-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48067926","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: 32
Comparative Study of the Silver Nano-/Microstructures Deposited from Aerosol and Fog 气溶胶和雾沉积银纳米/微观结构的比较研究
纳米粒子(英文) Pub Date : 2017-08-03 DOI: 10.4236/ANP.2017.63011
A. Zheltova, E. V. Maslyonkova, Y. Biryukov, P. R. Kasanskii, S. M. Ryndya, A. S. Smolyanskii
{"title":"Comparative Study of the Silver Nano-/Microstructures Deposited from Aerosol and Fog","authors":"A. Zheltova, E. V. Maslyonkova, Y. Biryukov, P. R. Kasanskii, S. M. Ryndya, A. S. Smolyanskii","doi":"10.4236/ANP.2017.63011","DOIUrl":"https://doi.org/10.4236/ANP.2017.63011","url":null,"abstract":"A comparative study of the structure and fractal properties of arrays of the silver nano-/micro-particles deposited on the silicon substrate both from the aerosol and fog showed that the form of the silver individual particles and nano-/microstructures greatly depends on the deposition conditions. By passing an aerosol through isopropyl alcohol, the formation of fractal aggregates of the silver nano-/micro-particles both in the air and in alcohol was observed. Deposition of the silver nano-/micro-particles in the atmosphere of the saturated isopropyl alcohol vapours led to formation of fog. Microdroplets of the silver colloidal solution were deposited on the substrate. The further evaporation of alcohol created the silver nano/microstructures in the form of annular layers. It was found that the concerned annular layers contained silver particles of the same shape in the form of a Crescent (or Janus-nano-/microparticles). The nature of discovered effects is discussed.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"128-139"},"PeriodicalIF":0.0,"publicationDate":"2017-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48293034","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
Interaction of Immune System Protein with PEGylated and Un-PEGylated Polymeric Nanoparticles 免疫系统蛋白与聚乙二醇化和非聚乙二醇化纳米聚合物的相互作用
纳米粒子(英文) Pub Date : 2017-08-03 DOI: 10.4236/ANP.2017.63009
M. Eshete, K. Bailey, T. Nguyen, S. Aryal, Seong-O Choi
{"title":"Interaction of Immune System Protein with PEGylated and Un-PEGylated Polymeric Nanoparticles","authors":"M. Eshete, K. Bailey, T. Nguyen, S. Aryal, Seong-O Choi","doi":"10.4236/ANP.2017.63009","DOIUrl":"https://doi.org/10.4236/ANP.2017.63009","url":null,"abstract":"Biodegradable Nanoparticles (NPs) are under intense investigation due to their potential application in targeted drug delivery. Upon their entry to the biological system, they encounter the immune system, which limits their availability at the intended site. Most importantly, the innate immune system is the one that acts as the first line of defense against foreign materials. It can be activated by collectin proteins which recognize the structural pattern of polysaccharide on the surface of microorganisms. NPs may interact with these proteins in a similar way, and the interaction may lead to beneficial outcomes in vaccine delivery. On the other hand, in targeted drug delivery, it is desirable for the NPs not to be recognized as foreign material as this may lead to their fast elimination from the system through mechanism such as opsonization. We investigated the interaction of PEGylated and un-PEGylated PLGA NPs with Recombinant Human Mannose-Binding Protein (HMBP) in an effort to understand the effect of surface modification on their binding to the protein. Results show that both PLGA-COOH and PLGA-PEG-NH2 bind to HMBP as studied using dynamic light scattering (DLS), fluoresce and UV-vis spectroscopy. However, their binding is shown to have different effect on the structure of the protein. Study done using fluorescence spectroscopy displayed a decrease in fluorescence emission of the protein upon binding to PLGA-COOH. On the other hand the fluorescence emission of the protein increased upon binding to the PLGA-PEG-NH2 indicating conformational changes in the protein structure.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"103-113"},"PeriodicalIF":0.0,"publicationDate":"2017-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44407105","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
In-Situ XAFS Characterization of PtPd Nanoparticles Synthesized by Galvanic Replacement 电化学置换法制备PtPd纳米粒子的原位XAFS表征
纳米粒子(英文) Pub Date : 2017-03-21 DOI: 10.4236/ANP.2017.62007
Simon Tymen, Andreas C Scheinost, C. Friebe, U. Schubert
{"title":"In-Situ XAFS Characterization of PtPd Nanoparticles Synthesized by Galvanic Replacement","authors":"Simon Tymen, Andreas C Scheinost, C. Friebe, U. Schubert","doi":"10.4236/ANP.2017.62007","DOIUrl":"https://doi.org/10.4236/ANP.2017.62007","url":null,"abstract":"Platinum-palladium nanoparticles are synthesized and characterized with regard to their application in fuel cells due to their high (electro) catalytic activity. Different preparation times are applied leading to different structures, from Pd cubic to core-shell PtPd concave, and different chemical compositions. The resulting particles are studied via Transmission Electron Microscopy (TEM) and in-situ X-ray absorption fine structure (XAFS) measurements. The latter allows the investigation of the oxygen reduction reaction following the variations with varying applied potentials by analysis using the Iterative Transformation Factor Analysis (ITFA) and the creation of a two-component system that consists of metallic Pt-Pd and the related oxide. With the used model, the different concentrations of the oxide are linked to the consecutive chemical steps of the oxygen reduction reaction. Finally, the catalytic activity of the particles is determined via linear scanning voltammetry and reveals a dependence on the shape and the composition of the particles.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"75-91"},"PeriodicalIF":0.0,"publicationDate":"2017-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48508656","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
Electrospinning Synthesis and Photoluminescence Properties of One-Dimensional SiO 2 :Tb 3+ Nanofibers and Nanobelts 静电纺丝法合成一维二氧化钛纳米纤维及纳米带及其光致发光性能
纳米粒子(英文) Pub Date : 2017-03-21 DOI: 10.4236/ANP.2017.62004
Murad M. A. Abualrejal, H. Zou, Jie Chen, Yanhua Song, Ye Sheng
{"title":"Electrospinning Synthesis and Photoluminescence Properties of One-Dimensional SiO 2 :Tb 3+ Nanofibers and Nanobelts","authors":"Murad M. A. Abualrejal, H. Zou, Jie Chen, Yanhua Song, Ye Sheng","doi":"10.4236/ANP.2017.62004","DOIUrl":"https://doi.org/10.4236/ANP.2017.62004","url":null,"abstract":"Controlled synthesis of functional photoluminescent materials is of particular interest due to their fascinating optical properties. Herein, highly uniform one-dimensional (1D) SiO2:xTb3+ nanofibers and nanobelts are fabricated by electrospinning method combined with sol-gel method. The as-prepared SiO2:xTb3+ nanofibers are belt-like morphology after calcination. The formation mechanism of SiO2:xTb3+ nanofibers and nanobelts is proposed based on decomposition of polyvinylpyrrolidone (PVP) and crystallization of SiO2. The photoluminescence (PL) intensity of SiO2:xTb3+ nanofibers and nanobelts is Tb3+ ions concentration dependent with a maximum at 4 mol% of Tb3+. Particularly, SiO2:xTb3+ nanofibers and nanobelts exhibit a green emission corresponding to 5D4 → 7Fj transition (541 nm) of Tb3+.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"33-47"},"PeriodicalIF":0.0,"publicationDate":"2017-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41971547","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
Adsorption of Silver Nanoparticles from Aqueous Solution by Multiwalled Carbon Nanotubes 多壁碳纳米管对水溶液中银纳米粒子的吸附
纳米粒子(英文) Pub Date : 2017-03-21 DOI: 10.4236/ANP.2017.62003
D. Hassan, Mohamed Farghali
{"title":"Adsorption of Silver Nanoparticles from Aqueous Solution by Multiwalled Carbon Nanotubes","authors":"D. Hassan, Mohamed Farghali","doi":"10.4236/ANP.2017.62003","DOIUrl":"https://doi.org/10.4236/ANP.2017.62003","url":null,"abstract":"Silver nanoparticles (AgNPs) are becoming an emerging pollutant of the environment. In this study, the efficacy of Multiwalled carbon nanotubes (MWCNTS) to remove AgNPs from aqueous solution at a concentration of 250 and 500 mg/100 ml MWCNTS was investigated. The results showed that the adsorption of AgNPs by 250 and 500 mg/100 ml MWCNTS after a contact time of 10 min., 30 min., 60 min., 120 min. and 240 min was 33.95%, 34.36%, 40.32%, 45.33%, 58.53% and 57.29%, 61.27%, 64.89%, 87.21%, 88.58%, respectively. The statistical analysis of data showed that, after adding 250 and 500 mg/100 ml MWCNTS, the total residues of AgNPs were significantly reduced in all MWCNTS exposed samples when compared to the control groups (P < 0.05). Moreover, at the two used concentrations, there were significant differences between 240 min. and all other contact times. The result concluded that the removal percent of AgNPs from aqueous solution was increased with the increase in contact time and concentrations of MWCNTS. Additionally, MWCNTS are expected to be potential adsorbent in the future due to their high removal capacity of nano-sized silver.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"22-32"},"PeriodicalIF":0.0,"publicationDate":"2017-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49557380","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
Preparation, Characterization and Evaluation of Efficacy of Phosphorus and Potassium Incorporated Nano Fertilizer 磷钾复合纳米肥料的制备、表征及药效评价
纳米粒子(英文) Pub Date : 2017-03-21 DOI: 10.4236/ANP.2017.62006
Anjuman Ara Rajonee, Shurovi Zaman, S. Huq
{"title":"Preparation, Characterization and Evaluation of Efficacy of Phosphorus and Potassium Incorporated Nano Fertilizer","authors":"Anjuman Ara Rajonee, Shurovi Zaman, S. Huq","doi":"10.4236/ANP.2017.62006","DOIUrl":"https://doi.org/10.4236/ANP.2017.62006","url":null,"abstract":"Phosphorus and Potassium incorporated nano fertilizer were prepared using zeolite as a carrier material at a laboratory scale. X-ray diffraction (XRD) analysis was done for the characterization and confirmation of the incorporation. Chemical analyses also indicate the sorption of fertilizer material into zeolite. An in vitro incubation study was conducted for 30 days at field moisture condition to see the release of the fertilizer materials and was compared with a conventional fertilizer. The release pattern of nutrients from either source showed a substantial decreasing trend with time although the release of P and K was higher for nano fertilizer than the conventional one. A pot culture experiment with Ipomoea aquatica (Kalmi) was also conducted to see the efficacy of the nano fertilizer in the growth promotion of the plant. Analysis showed higher accumulation of P and K in plants grown with nano fertilizer. Post-effect of nano fertilizer application in soil showed better pH, moisture, CEC, available P and K under nano fertilizer treatment than the conventional fertilizer.","PeriodicalId":71264,"journal":{"name":"纳米粒子(英文)","volume":"06 1","pages":"62-74"},"PeriodicalIF":0.0,"publicationDate":"2017-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46670860","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: 43
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