共查询到19条相似文献,搜索用时 140 毫秒
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选择合适的摩尔比、pH值、反应浓度、反应温度和反应时间,采用有氧开放的化学共沉法制备出低成本Fe3O4纳米磁性微粒.以聚α-烯烃合成油(PAO)为基液,选取适配的表面活性剂(PG-3),制备出了低挥发度、多粘度级别的实用化纳米磁性流体.应用于扬声器中,显著提高了扬声器线圈的散热效果. 相似文献
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依据现代科技体系的科学--技术--一个层次综述了磁性科技的新近发展,着重阐明了磁性理论、学科合作与交叉、磁性技术和磁性工程一产业化方面的前沿态势,并对我国发展磁性科技提出了点滴思考 。 相似文献
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使结晶粒子细化或微细化是提高现有材料性能、开发新型材料的有效手段之一.本文介绍各种微细和超微细磁性粒子的制备技术及其在开发高性能材料中的应用. 相似文献
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磁性薄膜及其应用的发展 总被引:1,自引:0,他引:1
简要回顾了磁性薄膜及其制备,评价技术研究开发的历史。重点介绍近几年开发的高密度磁和磁光记录用连续薄膜介质与新型磁头材料,巨大磁敏电阻人工格,高频微型软磁器件用磁膜,MMIC兼容的微波铁氧体膜及永磁膜,和稀释磁性半导体薄膜、人工格的制备工艺、主要性能及其应用。指出薄膜技术给现代科学技术发展带来现实而深远的影响。 相似文献
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有机基Fe_3O_4磁性液体的制备和表征 总被引:1,自引:0,他引:1
用油酸作为表面活性剂,采用化学共沉淀法制备纳米级Fe3O4磁性粒子,以此制备有机磁性液体。实验研究了Fe2+/Fe3+配比、不同的制备路线、表面活性剂的用量三个方面对磁流体的影响,并分析了这些因素的影响机制。确定高纯度、小粒径、均匀分散的Fe3O4磁性粒子的合理工艺条件:n(Fe2+)﹕n(Fe3+)=1﹕1.65,制备路线二,制备0.01molFe3O4表面活性剂用量为0.7ml。产物在油酸包裹后基本全部萃取到有机相,且分散均匀。XRD分析证实了产物为纯Fe3O4磁性粒子,平均粒径为50nm左右。 相似文献
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With the growing need for high performance gas sensors, a variety of preparation methods have been introduced and investigated.
In the present contribution, the focus is on novel means for preparing metal oxide gas sensor devices. First, the key gas
sensor concepts are reviewed as well as the conventional deposition techniques widely used for thick and thin film deposition
of metal oxides such as screen-printing and chemical and physical vapour deposition. This is followed by a review and examination
of innovative deposition techniques developed within the past several years, focusing on methods with direct-write features
as well as techniques offering precise control of micro- and nano-structural features of the deposited materials. 相似文献
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Price W.W. Wirgau K.A. Murdoch A. Mitsche J.V. Vaahedi E. El-Kady M. 《Power Systems, IEEE Transactions on》1988,3(1):180-187
A novel method is presented for preparing load models for power flow and stability studies. The LOADSYN load model synthesis software package transforms data on load class mix, composition, and characteristics into the form required for commonly used flow and transient stability simulation programs. Typical default data have been developed for load composition and characteristics. The load-modeling techniques used in this software and results of initial testing are described. Significant improvements in simulation accuracy are demonstrated 相似文献
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Most electric utilities have old cable in their underground distribution systems that is particularly prone to water-tree damage. System reliability, and its impact on customer satisfaction, is perhaps the top concern faced by electric utilities preparing for an era of competition. Utilities with aged cable and limited budgets need to consider all types of solutions short of wholesale replacement. Here, the authors describe how a US utility has used CableCURE fluid, a dielectric enhancement technology that restores water-damaged stranded cable, to overcome such concerns 相似文献