IN SITU, REMOTELY INTERROGATABLE MAGNETOCHEMICAL SENSORS

原位远程询问磁化学传感器

• 批准号: 2562604
• 负责人: CRAIG A GRIMES
• 金额: $ 8.34万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2562604
• 关键词: acidity /alkalinity; biomaterial development /preparation; biomedical equipment development; biosensor device; carbon dioxide; chemical stimulation; electrical potential; electromagnetic radiation; food contamination; glucose; hydrazines; hydrogen sulfide; magnetic field; metals; monitoring device; polymers; radio controlled electronic stimulator; telemetry

DESCRIPTION: (Adapted from the investigator's abstract) This proposal seeks funding for the development of a new type of sensor that offers the opportunity for remote, in-situ, continuous, long term monitoring of given chemical stimuli. In its initial design the sensor is comprised of a thing polymeric layer made so that it swells in the presence of certain stimuli, bounded on each side by a magnetically soft thin film. For fixed magnetic layer design, the magnetic switching characteristics of the sensor 'sandwich' are a function of the thickness of the intervening polymeric spacer layer. Placed within a sinusoidal magnetic field the magnetization vector of the sensor periodically reverses directions, generating a series of voltage spikes in suitably located detecting coils. The general shape and magnitude of the voltage spikes are dependent upon how much the spacer layer has swollen or contracted in response to the given stimuli. Since the sensor is monitored through changes in magnetic flux, no physical connections such as wires or cables are needed to obtain sensor information, nor line of sight as needed with laser telemetry; the sensors can be placed within opaque or metallic enclosures such as people, hermetically sealed bags, etc. The polymeric chemistry is flexible and selective. The polymer swelling is due only to the functional group, it does not involve the polymer backbone. Therefore, the sensor will respond only to the given chemical analyte for which it has been designed. While the sensors are quite durable, the projected cost of the sensors is inexpensive enough to be readily used on a disposable basis. One detecting unit can serve an unlimited number of sensors; the technology would be ideally suited for monitoring contamination of blood supplies or foodstuffs through sensing for CO2 levels, in-vivo glucose or pH levels, moisture levels in sealed containers, metal ion pollutants in water pipes, etc. The primary research objectives of this proposed work are: (1) Precisely determine the variation in voltage with pH for the pH sensor and how it is affected by the thickness of the polymer and magnetic layers, and polymer formulation variables. (2) Develop technology for controlling sensor response times. (3) Refine sensor detection electronics. (4) Develop polymers or other space layer materials for applications including glucose, CO2, hydrogen sulfide and hydrazine. (3) Evaluate the robustness of the different polymer layers. (6) Translate developmental work to field demonstration units to promote application of the new sensor technology.

描述：（改编自研究者的摘要）该提案寻求 为开发新型传感器提供资金 对给定的情况进行远程、现场、连续、长期监测的机会 化学刺激。 在最初的设计中，传感器由一个物体组成 聚合物层在某些刺激下会膨胀， 每侧都由软磁薄膜包围。 固定磁力用 层设计，传感器的磁开关特性 “三明治”是中间聚合物厚度的函数 间隔层。 置于正弦磁场内，磁化强度 传感器的矢量周期性地反转方向，产生一系列 位于适当位置的检测线圈中的电压尖峰。 一般形状 电压尖峰的大小取决于间隔物的大小 层响应给定的刺激而肿胀或收缩。 自从 传感器通过磁通量的变化进行监测，无需物理 需要电线或电缆等连接来获取传感器信息， 也没有激光遥测所需的视线；传感器可以放置 在不透明或金属外壳（例如人）内，密封 袋子等 高分子化学具有灵活性和选择性。 聚合物的溶胀率为 由于仅包含官能团，因此不涉及聚合物主链。 因此，传感器将仅对给定的化学分析物做出响应 它已经被设计出来了。 虽然传感器非常耐用， 传感器的预计成本足够便宜，可以很容易地在 一次性基础。 一个检测单元可以服务无限数量的 传感器；该技术非常适合监测污染 通过感测体内二氧化碳水平来控制血液供应或食品 葡萄糖或 pH 值、密封容器中的水分含量、金属离子 水管中的污染物等。本课题的主要研究目标 建议的工作是： (1) 精确确定电压随 pH 值的变化 pH 传感器及其如何受聚合物厚度的影响以及 磁性层和聚合物配方变量。 （二）开发技术 用于控制传感器响应时间。 (3) 细化传感器检测 电子产品。 (4) 开发聚合物或其他空间层材料 应用包括葡萄糖、二氧化碳、硫化氢和肼。 (3) 评估不同聚合物层的坚固性。 (6) 翻译 开展实地示范单位推广应用工作 新的传感器技术。