Journal of Nanoparticles最新文献_第4页

Biogenic Synthesis of Silver Nanoparticles Using Scenedesmus abundans and Evaluation of Their Antibacterial Activity 利用丰度菌生物合成纳米银及其抗菌活性评价

Journal of Nanoparticles Pub Date : 2014-09-14 DOI: 10.1155/2014/689419

N. Aziz, T. Fatma, A. Varma, R. Prasad

引用次数: 142

Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium 表面活性剂在水介质中金纳米颗粒形成中的作用

Journal of Nanoparticles Pub Date : 2014-09-10 DOI: 10.1155/2014/916429

Abhishek Das, Ridhima Chadha, N. Maiti, S. Kapoor

{"title":"Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium","authors":"Abhishek Das, Ridhima Chadha, N. Maiti, S. Kapoor","doi":"10.1155/2014/916429","DOIUrl":"https://doi.org/10.1155/2014/916429","url":null,"abstract":"The stability of gold nanoparticles is a major issue which decides their impending usage in nanobiotechnological applications. Often biomimetically synthesized nanoparticles are deemed useless owing to their instability in aqueous medium. So, surfactants are used to stabilize the nanoparticles. But does the surfactant only stabilize by being adsorbed to the surface of the nanoparticles and not play significantly in moulding the size and shape of the nanoparticles? Keeping this idea in mind, gold nanoparticles (GNPs) synthesized by l-tryptophan (Trp) mediated reduction of chloroauric acid (HAuCl4) were stabilized by anionic surfactant, sodium dodecyl sulphate (SDS), and its effect on the moulding of size and properties of the GNPs was studied. Interestingly, unlike most of the gold nanoparticles synthesis mechanism showing saturation growth mechanism, inclusion of SDS in the reaction mixture for GNPs synthesis resulted in a bimodal mechanism which was studied by UV-Vis spectroscopy. The mechanism was further substantiated with transmission electron microscopy. Zeta potential of GNPs solutions was measured to corroborate stability observations recorded visually.","PeriodicalId":16507,"journal":{"name":"Journal of Nanoparticles","volume":"21 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90042224","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: 25

A Simple Approach to Engineer SERS Substrates and Plasmonic Thin Film 工程SERS衬底和等离子体薄膜的简单方法

Journal of Nanoparticles Pub Date : 2014-08-25 DOI: 10.1155/2014/602385

N. Ahamad, Md Al-Amin, A. Ianoul

引用次数: 2

Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens 海洋无脊椎动物(多毛类)合成纳米银及其对人类病原体的作用评价

Journal of Nanoparticles Pub Date : 2014-08-21 DOI: 10.1155/2014/718240

Reena Singh, S. Sahu, M. Thangaraj

{"title":"Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens","authors":"Reena Singh, S. Sahu, M. Thangaraj","doi":"10.1155/2014/718240","DOIUrl":"https://doi.org/10.1155/2014/718240","url":null,"abstract":"Synthesis of metallic nanoparticles by chemical and physical method makes the process often cumbersome due the usage of toxic and expensive chemicals. The present study reports the biosynthesis of silver nanoparticles using marine invertebrate (polychaete) extract at room temperature. The ultraviolet-visible (UV-Vis) spectroscopy revealed the formation of silver nanoparticles (AgNPs) by exhibiting the typical surface plasmon absorption maximum at 418–420 nm. Structure and composition of AgNPs were analyzed by atomic force microscopy (AFM). Average particle size of AgNPs ranged from 40 to 90 nm, confirmed by scanning electron microscopy (SEM) analysis. The energy-dispersive X-ray spectroscopy (EDX) of the nanoparticles dispersion confirmed the presence of elemental silver signal, whereas X-ray diffraction (XRD) substantiated the crystalline nature of synthesized nanoparticle. Fourier transform infrared spectroscopy (FTIR) spectral analysis showed the presence of amides phenols, ethers, and fatty acids as major biomolecules responsible for the reduction of silver ions. The possible mechanism responsible for the synthesis of AgNPs by these biomolecules was also illustrated by chemical reactions. The synthesized AgNPs showed comparatively good antibacterial activity against the tested human pathogens. This study advocates that not only plants and microbes but also marine invertebrates do have potential for synthesizing nanoparticles by a cost-effective and eco-friendly approach.","PeriodicalId":16507,"journal":{"name":"Journal of Nanoparticles","volume":"164 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88708427","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: 39

Magnetic Fluid Hyperthermia of Rodent Tumors Using Manganese Perovskite Nanoparticles 利用钙钛矿纳米颗粒对啮齿动物肿瘤进行磁流体热疗

Journal of Nanoparticles Pub Date : 2014-08-14 DOI: 10.1155/2014/278761

L. Bubnovskaya, A. Belous, S. Solopan, A. Kovelskaya, L. Bovkun, A. Podoltsev, Igor Kondtratenko, S. Osinsky

{"title":"Magnetic Fluid Hyperthermia of Rodent Tumors Using Manganese Perovskite Nanoparticles","authors":"L. Bubnovskaya, A. Belous, S. Solopan, A. Kovelskaya, L. Bovkun, A. Podoltsev, Igor Kondtratenko, S. Osinsky","doi":"10.1155/2014/278761","DOIUrl":"https://doi.org/10.1155/2014/278761","url":null,"abstract":"Purpose. To test the antitumor activity of magnetic fluid (MF) on the basis of substituted lanthanum-strontium manganite nanoparticles combined with alternating magnetic field (AMF) in experiments with transplanted tumors. Materials and Methods. MF with a size of nanoparticles of 30–40 nm in aqueous agarose solution was investigated. The ability of MF to heat tumor under AMF (300 kHz, 7.7 kA/m) was tested in vivo with rodent tumors (Guerin carcinoma, Walker-256 carcinosarcoma, and Lewis lung carcinoma (3LL)). Results. Single administration of MF into the tumor at a dose of 150 mg/kg (rats) or 200 mg/kg (mice) followed by AMF within 20–30 min (treatment was repeated 3-4-fold) has resulted in the complete regression of tumor in the 35% of rats and 57% of mice. Administration of MF alone or action of AMF alone has not resulted in tumor growth inhibition. The chemomodifying effect of nanohyperthermia was determined, in particular for cisplatinum: thermal enhancement ratio was 2.0. It was also observed that nanohyperthermia has resulted in the absence of 3LL metastases in 43% of mice. Conclusions. MF on the basis of lanthanum-strontium manganite may be considered as an effective inductor of tumor local hyperthermia.","PeriodicalId":16507,"journal":{"name":"Journal of Nanoparticles","volume":"64 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82724677","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: 25

Response Surface Modelling of Electrosprayed Polyacrylonitrile Nanoparticle Size 电喷涂聚丙烯腈纳米颗粒尺寸的响应面建模

Journal of Nanoparticles Pub Date : 2014-08-10 DOI: 10.1155/2014/146218

Sanaz Khademolqorani, A. Z. Hamadani, H. Tavanai

引用次数: 4

Synthesis and the Structural Transformation of fcc to hcp in Ni-Graphene Nanocomposite by Simple Chemical Route via Sonication ni -石墨烯纳米复合材料中fcc合成及结构转化研究

Journal of Nanoparticles Pub Date : 2014-06-23 DOI: 10.1155/2014/305637

Nilesh K. Mahale, R. D. Ladhe, S. Attarde, S. Ingle

{"title":"Synthesis and the Structural Transformation of fcc to hcp in Ni-Graphene Nanocomposite by Simple Chemical Route via Sonication","authors":"Nilesh K. Mahale, R. D. Ladhe, S. Attarde, S. Ingle","doi":"10.1155/2014/305637","DOIUrl":"https://doi.org/10.1155/2014/305637","url":null,"abstract":"We report the synthesis and structural transformation of fcc to hcp in Ni-graphene (Ni-Gr) composite by simple chemical route via sonication. The syntheses of Ni-Gr composite by simultaneous reduction method, and the effect of different composition ratio on morphology and crystal structure were examined in our present study. The results indicated that the graphene ratio played an important role in crystal structure and d-spacing in nickel crystals. Different compositions have shown different behavior. The nanonickel clusters of various shapes with coated graphene and decorated as nickel on graphene sheets are observed. The synthesized composites were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscope (TEM). The XRD patterns indicated crystal lattice modifications in some composites while composites with a higher graphene ratio produced very small crystals with uniform lattice parameter and d-spacing. FE-SEM images indicated the growth of Datura fruit like shapes of nickel clusters in higher composition of nickel while the composites with least concentration of nickel were composed of cubical nanoparticles grown on graphene sheets. TEM analysis revealed many Ni nanoparticles surrounding the smooth petals like surface of graphene, with average diameters of spiky nickel nanoparticles being about 50 nm and 124 nm, respectively, on 200 nm of scale.","PeriodicalId":16507,"journal":{"name":"Journal of Nanoparticles","volume":"5 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84560907","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

Optical and Structural Properties of ZnO Nanoparticles Synthesized by CO2 Microwave Plasma at Atmospheric Pressure 常压CO2微波等离子体合成ZnO纳米粒子的光学和结构特性

Journal of Nanoparticles Pub Date : 2014-06-23 DOI: 10.1155/2014/734256

Se M. Chun, D. Choi, J. Park, Y. Hong

引用次数: 5

Ecofriendly Application of Nanomaterials: Nanobioremediation 纳米材料的环保应用:纳米生物修复

Journal of Nanoparticles Pub Date : 2014-06-19 DOI: 10.1155/2014/431787

Rizwan, Man Singh, C. Mitra, Roshan K. Morve

{"title":"Ecofriendly Application of Nanomaterials: Nanobioremediation","authors":"Rizwan, Man Singh, C. Mitra, Roshan K. Morve","doi":"10.1155/2014/431787","DOIUrl":"https://doi.org/10.1155/2014/431787","url":null,"abstract":"Nanomaterials exhibit unique physical and chemical properties and, hence, they have received much attention from scientists and researchers in different areas of environmental sciences, specifically in bioremediation. Bioremediation provides a good clean-up strategy for some types of waste, but as it is expected, it will not be useful for all. For example, bioremediation may not provide a feasible strategy at sites with high concentrations of chemicals that are toxic to most microorganisms. These include heavy metals and salt. Further, the advancement in science and technology has increased standard of living which directly or indirectly contributes to the increase in waste and toxic material. Therefore, the remediation of contaminants by use of existing technology is not effective and efficient in cleaning up the environment. Hence, nanomaterials may be applied for bioremediation, which will not only have less toxic effect on microorganisms, but will also improve the microbial activity of the specific waste and toxic material which will reduce the overall time consumption as well as reduce the overall cost. In this paper we have briefly summarized the major types of nanomaterials that have been used so far in bioremediation of waste and toxic materials.","PeriodicalId":16507,"journal":{"name":"Journal of Nanoparticles","volume":"55 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84900546","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: 113

Studies on the Iron Nanoparticles Catalyzed Reduction of Substituted Aromatic Ketones to Alcohols 铁纳米颗粒催化取代芳酮还原为醇的研究

Journal of Nanoparticles Pub Date : 2014-06-11 DOI: 10.1155/2014/156868

L. Parimala, J. Santhanalakshmi

引用次数: 16