A remote query magnetoelastic pH sensor
A remote query magnetoelastic pH sensor
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DOI：
10.1016/s0925-4005(00)00599-2
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发表时间：
2000-11-15
影响因子：
8.4
通讯作者：
Grimes, CA
中科院分区：
文献类型：
--
作者：
Cai, QY;Grimes, CA
描述了一种由涂有变质量pH响应聚合物的磁弹性厚膜组成的远程查询磁弹性pH传感器。作为对磁性查询的响应，磁弹性传感器以与附着的聚合物层的质量成反比的特征频率机械振动。由于磁弹性传感器是磁致伸缩的，传感器的机械振动可以发射磁通量，可以使用拾取线圈从传感器远程检测到。以20 mol%的丙烯酸和80 mol%的丙烯酸异辛酯为原料合成pH响应共聚物，并通过浸渍涂覆在磁弹性膜上。在30微米厚的metglass上涂覆1微米聚合物涂层[metglass合金是霍尼韦尔公司的注册商标。有关产品信息见：http://www.electronicmaterials.com:80/businesses/sem/amorph/page5_1_2.htm.]合金2826MB磁弹性膜在pH值5和9之间谐振频率的变化是线性的，约为285 Hz/pH或0.6%/pH。在测试溶液中加入10 mmol/l的KCl会使聚合物的灵敏度降低约4%。(C) 2000 Elsevier Science B.V.版权所有
A remote query magnetoelastic pH sensor comprised of a magnetoelastic thick-film coated with a mass-changing pH-responsive polymer is described. In response to a magnetic query held the magnetoelastic sensor mechanically vibrates at a characteristic frequency that is inversely dependent upon the mass of the attached polymer layer. As the magnetoelastic sensor is magnetostrictive the mechanical vibrations of the sensor launch magnetic flux that can be detected remotely from the sensor using a pickup coil. The pH responsive copolymer is synthesized from 20 mol% of acrylic acid and 80 mol% of iso-octyl acrylate and then deposited onto a magnetoelastic film by dip-coating. For a 1 mum polymer coating upon a 30 mum thick Metglas [The Metglas alloys are a registered trademark of Honeywell Corporation. For product information see: http://www.electronicmaterials.com:80/businesses/sem/amorph/page5_1_2.htm.] alloy 2826MB magnetoelastic film between pH 5 and 9 the change in resonant frequency is linear, approximately 285 Hz/pH or 0.6%/pH. The addition of 10 mmol/l of KCl to the test solution decreases the sensitivity of the polymer approximately 4%. (C) 2000 Elsevier Science B.V. All rights reserved.