China Particuology最新文献_第6页

Magnetic filtration of an iron oxide aerosol by means of magnetizable grates 用磁化格栅对氧化铁气溶胶进行磁过滤

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2006.12.006

A. Alvaro , J.M. Rodríguez , Paulo A. Augusto , A.M. Estévez

{"title":"Magnetic filtration of an iron oxide aerosol by means of magnetizable grates","authors":"A. Alvaro , J.M. Rodríguez , Paulo A. Augusto , A.M. Estévez","doi":"10.1016/j.cpart.2006.12.006","DOIUrl":"10.1016/j.cpart.2006.12.006","url":null,"abstract":"<div><p>The cleaning of gases with low concentrations of small ferromagnetic or paramagnetic particles is a difficult task for conventional filtration. A new alternative procedure, magnetic filtration, is used in this work.</p><p>Iron oxide aerosol was generated by elutriation of iron oxide particles from a fluidized bed consisting of a mixture of Geldart-C iron oxide powder and large spherical Geldart-B sand particles. The aerosol was filtered by means of a magnetic filter which consisted of one, two or three iron grates staggered to each other. The experimental installation contained also an isokinetic sampling system and a Microtrac SRA 150 Particle Analyser.</p><p>A theoretical expression for filtration efficiency was deduced from a previous model taking into account the different forces acting on the iron oxide particles. Experimental filtration efficiency matches quite well calculated theoretical efficiency. It was found that an increase in particle size, in the number of grates or in the applied magnetic field produced higher filtration efficiencies up to 100% in some cases. In all filtration experiments pressure drop through the magnetic filter was very small.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 1","pages":"Pages 140-144"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2006.12.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84203411","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

Magnetic nanoparticles and concentrated magnetic nanofluids: Synthesis, properties and some applications 磁性纳米颗粒和浓缩磁性纳米流体:合成、性质和一些应用

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.015

Ladislau Vékás , Doina Bica , Mikhail V. Avdeev

引用次数: 179

Synthesis and characterization of magnetic polymer microspheres with a core–shell structure 核壳结构磁性高分子微球的合成与表征

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.012

Ming Lu, Shu Bai, Kun Yang, Yan Sun

引用次数: 14

Magnetic field assisted fluidization: A modified Richardson–Zaki equation 磁场辅助流化:一个修正的Richardson-Zaki方程

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.001

Jose Manuel Valverde, Antonio Castellanos

{"title":"Magnetic field assisted fluidization: A modified Richardson–Zaki equation","authors":"Jose Manuel Valverde, Antonio Castellanos","doi":"10.1016/j.cpart.2007.01.001","DOIUrl":"10.1016/j.cpart.2007.01.001","url":null,"abstract":"<div><p>Magnetic particles can be uniformly fluidized by coupling the gas flow with an externally imposed magnetic field. Interparticle forces generated by the magnetic field cause aggregation of the particles in chain-like structures preferentially oriented along the magnetic field lines. In the present paper, we study the implications of the formation of these special types of aggregates on the empirical Richardson–Zaki (RZ) equation, originally proposed to describe the expansion of fluidized beds of non-aggregated particles. We have addressed two important issues, namely the flow regime, which is a function of the size of the aggregates, and the effect of shape and orientation of the chain-like aggregates with respect to gas flow on fluid drag. We propose a modified RZ equation (MRZE) in which the velocity scale, given by the terminal settling velocity of the individual aggregates, and the RZ exponent are predetermined as a function of the chain length. The chain length depends on the ratio of the magnetic energy to gravitational energy, and is estimated from the magnetic field intensity, and particle magnetization, size and density. Predictions of the MRZE are successfully compared with published results in the literature on the expansion of magnetic particles in the presence of externally applied magnetic fields.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 1","pages":"Pages 61-70"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.01.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88734276","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

Behavior of mixed ZnO and SiO2 nano-particles in magnetic field assisted fluidization 混合ZnO和SiO2纳米颗粒在磁场辅助流化中的行为

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.008

Ping Zeng , Tao Zhou , Guanqun Chen , Qingshan Zhu

引用次数: 22

Effects of magnetic field on fluidization properties of magnetic pearls 磁场对磁性珍珠流化性能的影响

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.013

Maoming Fan , Zhenfu Luo , Yuemin Zhao , Qingru Chen , Daniel Tao , Xiuxiang Tao , Zhenqiang Chen

引用次数: 13

Dextran-modified iron oxide nanoparticles 右旋糖酐修饰氧化铁纳米颗粒

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.01.003

Jiří Hradil, Alexander Pisarev, Michal Babič, Daniel Horák

引用次数: 57

Synthesis and surface modification of magnetic particles for application in biotechnology and biomedicine 应用于生物技术和生物医学的磁性颗粒的合成和表面改性

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2006.11.001

Zhiya Ma, Huizhou Liu

引用次数: 85

Numerical simulation and experimental verification of silicone oil flow over magnetic fluid under applied magnetic field 外加磁场作用下硅油在磁流体上流动的数值模拟与实验验证

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2006.12.005

Ruoyu Hong , Zhiqiang Ren , Shizhong Zhang , Jianmin Ding , Hongzhong Li

引用次数: 9

Large scale manufacture of magnetic polymer particles using membranes and microfluidic devices 利用膜和微流体装置大规模制造磁性聚合物颗粒

China Particuology Pub Date : 2007-02-01 DOI: 10.1016/j.cpart.2007.02.001

Qingchun Yuan, Richard A. Williams

{"title":"Large scale manufacture of magnetic polymer particles using membranes and microfluidic devices","authors":"Qingchun Yuan, Richard A. Williams","doi":"10.1016/j.cpart.2007.02.001","DOIUrl":"10.1016/j.cpart.2007.02.001","url":null,"abstract":"<div><p>Magnetic polymer particles have found applications in diverse areas such as biomedical treatments, diagnosis and separation technology. These applications require the particles to have controlled sizes and narrow size distributions to gain better control and reproducibility in use. This paper reviews recent developments in the preparation of magnetic polymer particles at nano- and micro-scales by encapsulating magnetic components with dissolved or <em>in situ</em> formed polymers. Particle manufacture using emulsification and embedment methods produces magnetic polymer particles at micro-scale dimensions. However, the production of particles in this range using conventional emulsification methods affords very limited control over particle sizes and polydispersity. We report on alternative routes using membrane and microfluidics emulsification techniques, which have a capability to produce monodisperse emulsions and polymer microspheres (with coefficients of variation of less than 10%) in the range from submicrometer to a few 100μm. The performance of these manufacturing methods is assessed with a view to future applications.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 1","pages":"Pages 26-42"},"PeriodicalIF":0.0,"publicationDate":"2007-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.02.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75683378","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: 23