纳米科学与工程(英文)最新文献_第4页

Preparation and Characterization of Silver Nanoparticles and their Use in Catalytic Reduction of 4-Nitrophenol 纳米银的制备、表征及其在4-硝基苯酚催化还原中的应用

纳米科学与工程(英文) Pub Date : 2016-01-15 DOI: 10.4236/WJNSE.2016.61003

F. Al-Marhaby, R. Seoudi

引用次数: 40

Fe₃O₄ and Fe Nanoparticles by Chemical Reduction of Fe(acac)₃ by Ascorbic Acid: Role of Water 抗坏血酸化学还原铁(acac)3的Fe3O4和Fe纳米颗粒:水的作用

纳米科学与工程(英文) Pub Date : 2016-01-15 DOI: 10.4236/WJNSE.2016.61002

Ajinkya Nene, M. Takahashi, P. Somani

引用次数: 25

The Effect of Plasticizers on Mechanical Properties and Water Vapor Permeability of Gelatin-Based Edible Films Containing Clay Nanoparticles 增塑剂对含粘土纳米颗粒明胶基可食用薄膜力学性能和透气性的影响

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54019

M. Rezaei, A. Motamedzadegan

{"title":"The Effect of Plasticizers on Mechanical Properties and Water Vapor Permeability of Gelatin-Based Edible Films Containing Clay Nanoparticles","authors":"M. Rezaei, A. Motamedzadegan","doi":"10.4236/WJNSE.2015.54019","DOIUrl":"https://doi.org/10.4236/WJNSE.2015.54019","url":null,"abstract":"The effects of glycerol and sorbitol as two plasticizers on mechanical properties, water vapor permeability, thermal properties, color and capability of heat sealing of gelatin films (of phytophagous fish, bovine gelatin with high gel-forming ability, and bovine gelatin with low gel-forming ability) containing clay nanoparticles were studied in this research. For this purpose, 6 × 2 × 3 factorial experiments using the completely randomized design and comparison of the means at 95% confidence level (α = 0.05) were performed. Higher concentrations of plasticizers increased percentage elongation to the breaking point. When glycerol concentration was raised to over 20%, flexibility of the layers improved but their water vapor permeability increased. The minimum passage of water vapor was that of fish-skin gelatin films containing clay nanoparticles and 30% sorbitol, and the maximum that of bovine gelatin films with high gel-forming ability which contained nanoparticles but no plasticizers (p 0.05). All samples had heat sealing capability, and fish-skin gelatin films containing clay nanoparticles had better heat sealing capability compared with the other samples so that fish-skin gelatin films containing clay nanoparticles with 25% glycerol and 5% sorbitol had the highest flexibility and tensile strength, and remained attached to where they were heat sealed. Electron microscope images showed that films without plasticizers had uniform surfaces, but that samples containing glycerol at concentrations of over 0.20 g/g gelatin exhibited cavities between gelatin chains and that water vapor permeability in gelatin films containing clay nanoparticles.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"05 1","pages":"178-193"},"PeriodicalIF":0.0,"publicationDate":"2015-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70879732","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: 26

Development of Nanostructure Formation of Fe73.5Cu1Nb3Si13.5B9 Alloy from Amorphous State on Heat Treatment Fe73.5Cu1Nb3Si13.5B9合金非晶态热处理纳米结构形成的研究进展

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54013

M. Khalid Hossain, J. Ferdous, M. Haque, A. Hakim

{"title":"Development of Nanostructure Formation of Fe73.5Cu1Nb3Si13.5B9 Alloy from Amorphous State on Heat Treatment","authors":"M. Khalid Hossain, J. Ferdous, M. Haque, A. Hakim","doi":"10.4236/WJNSE.2015.54013","DOIUrl":"https://doi.org/10.4236/WJNSE.2015.54013","url":null,"abstract":"Iron-based amorphous alloys have attracted technological and scientific interests due to their excellent soft magnetic properties. The typical nanocrystalline alloy with the composition of Fe73.5Cu1Nb3Si13.5B9 known as FINEMENT has been studied for structural properties analysis. Recently, it is found that after proper annealing the amorphous alloy like Fe73.5Cu1Nb3Si13.5B9 has a transition to the nanocrystalline state, thus exhibiting good magnetic properties. The alloy in the form of ribbon of 10 mm width and 25mm thickness with the composition of Fe73.5Cu1Nb3Si13.5B9 was prepared by rapid quenching method. The prepared ribbon sample has been annealed for 30 min in a controlled way in the temperature range 490℃ - 680℃. By analyzing X-ray diffraction (XRD) patterns, various structural parameters such as lattice parameters, grain size and silicon content of the nanocrystalline Fe(Si) grains, crystallization behavior and nanocrystalline phase formation have been investigated. In the nanocrystalline state, Cu helps the nucleation of α-Fe(Si) grains while Nb controls their growth, Si and B has been used as glass forming materials. Thus on the residual amorphous, the nanometric Fe(Si) grains develops. From broadening of fundamental peaks, the optimum grain size has been determined in the range of 7 - 23 nm.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"05 1","pages":"107-114"},"PeriodicalIF":0.0,"publicationDate":"2015-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70879273","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: 12

Synthesis and Properties of Fumed Silicas Modified with Mixtures of Poly(methylphenylsiloxane) and Dimethyl Carbonate 聚甲基苯基硅氧烷与碳酸二甲酯混合改性气相二氧化硅的合成及性能研究

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54017

I. Protsak, V. Tertykh, Y. Bolbukh, D. Sternik, A. Deryło-Marczewska

引用次数: 2

Energy Efficient Manufacturing of Nanocellulose by Chemo- and Bio-Mechanical Processes: A Review 利用化学和生物机械方法高效制造纳米纤维素的研究进展

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54021

A. Bharimalla, S. Deshmukh, P. G. Patil, N. Vigneshwaran

{"title":"Energy Efficient Manufacturing of Nanocellulose by Chemo- and Bio-Mechanical Processes: A Review","authors":"A. Bharimalla, S. Deshmukh, P. G. Patil, N. Vigneshwaran","doi":"10.4236/WJNSE.2015.54021","DOIUrl":"https://doi.org/10.4236/WJNSE.2015.54021","url":null,"abstract":"Nanocellulose is a new-age material derived from cellulosic biomass and has large specific surface area, high modulus and highly hydrophilic in nature. It comprises of two structural forms viz., nanofibrillated cellulose (NFC) and nanocrystalline cellulose (NCC). This review provides a critical overview of the recent methods of bio- and chemo-mechanical processes for production of nanocellulose, their energy requirements and their functional properties. More than a dozen of pilot plants/commercial plants are under operation mostly in the developed countries, trying to exploit the potential of nanocellulose as reinforcing agent in paper, films, concrete, rubber, polymer films and so on. The utilization of nanocellulose is restricted mainly due to initial investment involved, high production cost and lack of toxicological information. This review focuses on the current trend and exploration of energy efficient and environment-friendly mechanical methods using pretreatments (both chemical and biological), their feasibility in scaling up and the future scope for expansion of nanocellulose application in diverse fields without impacting the environment. In addition, a nanocellulose quality index is derived to act as a guide for application based screening of nanocellulose production protocols.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"05 1","pages":"204-212"},"PeriodicalIF":0.0,"publicationDate":"2015-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70879876","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: 55

Synthesis and Structural Properties of Bismuth Doped Cobalt Nanoferrites Prepared by Sol-Gel Combustion Method 溶胶-凝胶燃烧法制备铋掺杂钴纳米铁素体及其结构性能

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54016

N. Kumar, K. Kumar

{"title":"Synthesis and Structural Properties of Bismuth Doped Cobalt Nanoferrites Prepared by Sol-Gel Combustion Method","authors":"N. Kumar, K. Kumar","doi":"10.4236/WJNSE.2015.54016","DOIUrl":"https://doi.org/10.4236/WJNSE.2015.54016","url":null,"abstract":"A series of Bismuth doped Cobalt nanoferrites of chemical composition CoBixFe2-xO4 (where x = 0.00, 0.05, 0.10, 0.15, 0.20 & 0.25) were prepared by sol-gel combustion method and calcinated at 600℃. The structural and morphological studies were carried out by using X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive Spectroscopy (EDS) and Fourier Transform Infrared (FT-IR) spectra showing the single phase spinal structure. The X-ray diffraction (XRD) analysis confirmed a single phase fcc crystal. The crystallite size of all the compositions was calculated using Debye-Scherrer equation and found in the range of 17 to 26 nm. The lattice parameters were found to be decreased as Bi3+ ion doping increases. The surface morphology was studied by Scanning Electron Microscope (SEM) and particle size was confirmed by Transmission Electron Microscopy (TEM). The EDS plots revealed existence of no extra peaks other than constituents of the taken up composition. The Fourier Transform Infrared (FT-IR) studies were made in the frequency range 350 - 900 cm-1 and observed two strong absorption peaks. The frequency band is found at 596 cm-1 where as the lower frequency band at 393 cm-1. It is clearly noticed that the two prominent absorption bands were slightly shifted towards higher frequency side with the increase of Bi3+ ion concentration.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"05 1","pages":"140-151"},"PeriodicalIF":0.0,"publicationDate":"2015-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70879551","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: 22

Method of Formation of Waveguides on the Basis of Any Polymeric Materials 基于任何聚合物材料的波导形成方法

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54022

V. Tsvetkov, S. Pasechnik, A. Dronov, J. Ho, V. Chigrinov, H. Kwok

引用次数: 0

In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form Birefringence 飞秒激光诱导纳米光栅的核心:从多孔纳米平面到形成双折射

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54014

R. Desmarchelier, B. Poumellec, F. Brisset, S. Mazérat, M. Lancry

引用次数: 31

Silica-Based Nanocoating Doped by Layered Double Hydroxides to Enhance the Paperboard Barrier Properties 层状双氢氧化物掺杂二氧化硅基纳米涂层增强纸板阻隔性能

纳米科学与工程(英文) Pub Date : 2015-11-13 DOI: 10.4236/WJNSE.2015.54015

Vânia M. Dias, A. Kuznetsova, J. Tedim, A. Yaremchenko, M. Zheludkevich, Inês Portugal, D. Evtuguin

{"title":"Silica-Based Nanocoating Doped by Layered Double Hydroxides to Enhance the Paperboard Barrier Properties","authors":"Vânia M. Dias, A. Kuznetsova, J. Tedim, A. Yaremchenko, M. Zheludkevich, Inês Portugal, D. Evtuguin","doi":"10.4236/WJNSE.2015.54015","DOIUrl":"https://doi.org/10.4236/WJNSE.2015.54015","url":null,"abstract":"Paperboard is an environment-friendly multi-layer material widely used for packaging applications. However, for food packaging paperboard lacks essential barrier properties towards oxygen and water vapor. Conventional solutions to enhance these barrier properties (e.g. paperboard film coating with synthetic polymers) require special manufacturing facilities and difficult the end-of-life disposal and recycling of the paperboard. Paperboard coating with silica-based formulations is an eco-friendly alternative hereby disclosed. Silica-nanocoatings were prepared by sol-gel synthesis, with or without the addition of Zn(2)-Al-NO3 layered double hydroxides (LDHs), and applied on the surface (ca 2 g/m2) of industrial paperboard samples by a roll-to-roll technique. The physicochemical features of silica-nanocoatings were studied by FTIR-ATR, SEM/EDS, XRD analysis and surface energy measurements. The barrier properties of uncoated and silica-coated paperboard were accessed by water vapor transmission rate (WVTR) and oxygen permeability (Jo2) measurements. The best barrier results were obtained for paperboard coated with a mixture of tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES), with and without the incorporation of LDHs.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"05 1","pages":"126-139"},"PeriodicalIF":0.0,"publicationDate":"2015-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70879917","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