An Electrochemical Impedance-Based Thermal Flow Sensor for Physiological Fluids

Baldwin, Alex; Liu, Yu; Meng, Ellis

doi:10.1109/jmems.2016.2614664

Cited by 35 publications

(15 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PBS and artificial cerebrospinal fluid are buffer systems comprising similar components such as sodium chloride, potassium chloride, potassium phosphate, and disodium phosphate. Furthermore, Baldwin and colleagues had found no significant differences in the response of an electrophysiological-thermal flow sensor between 1X PBS and cerebrospinal fluid [30].…”

Section: Discussionmentioning

confidence: 99%

Characterization and structure-property relationships of an injectable thiol-Michael addition hydrogel toward compatibility with glioblastoma therapy

et al. 2022

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Characterization and structure-property relationships of an injectable thiol-Michael addition hydrogel toward compatibility with glioblastoma therapy

et al. 2022

View full text Add to dashboard Cite

“…Theoretical models for water's viscosity are generally inaccurate, but the following equation fits to empirical viscosity measurements within 1% accuracy for temperatures between 0 and 100°C and atmospheric pressure (0.1 MPa): where is in Pa•s and a and b are dimensionless, experimentally determined constants [17]. Using this formula, the infinite dilution temperature coefficient of conductivity can be shown to vary from -3%/°C to -1.5%/°C, with a value of -1.95%/°C at 37°C [18]. The Stoke's Law model of infinite dilution conductivity can be improved by including dielectric losses which occur due to the movement of charged particles.…”

Section: Theorymentioning

confidence: 98%

A Flexible, Microfabricated Impedimetric Fluid Temperature Sensor

Baldwin¹,

Hudson²,

Yoon³

et al. 2018

2018 Solid-State, Actuators, and Microsystems Workshop Technical Digest

View full text Add to dashboard Cite

A novel impedimetric temperature sensor which utilizes the electrochemical impedance between two electrodes exposed to an aqueous solution to transduce temperature is presented. The solution resistance between electrodes is highly temperature dependent since ionic mobility increases with temperature. High-frequency electrochemical impedance can be used to accurately measure solution resistance, and therefore transduce fluid temperature. A temperature sensor composed of two platinum electrodes on a thin film Parylene C substrate exposed to fluid was designed, fabricated, and tested. Fluid temperature was transduced with high sensitivity (-59.33 Ω/°C) by measuring the impedance magnitude between electrodes at an appropriate frequency where phase was minimized. Compared to conventional platinum resistance temperature detectors (RTDs), our sensor achieved over 4× higher sensitivity and resolution (±0.02°C). Furthermore, the sensor is specifically designed for use in liquids, and features flexible, biocompatible construction for biomedical or microfluidic applications.

show abstract

“… ( a ) Wireless coils (Reprinted from Reference [ 16 ] with permission from Elsevier); ( b ) flow, pressure and patency sensors to monitor hydrocephalus treatment (©2016 IEEE. Reprinted, with permission, from Reference [ 23 ]); ( c ) hippocampal neural probe array (©2017 IEEE. Reprinted, with permission, from Reference [ 37 ]); and ( d ) retinal prosthesis that matches the curvature of the eye (Reprinted from Reference [ 49 ] with permission from Elsevier).…”

Section: Figurementioning

confidence: 99%

“…Radio frequency powered coils were fabricated with Parylene for wireless transmission ( Figure 3 a) [ 16 , 17 ] and more recently a new method to wirelessly transduce electrochemical impedance was developed using Parylene coils [ 18 ]. Parylene microsensors ( Figure 3 b) were developed to measure intraocular and intracranial pressures [ 19 , 20 , 21 ] and Parylene thermal sensors were created to detect small flows [ 22 , 23 , 24 , 25 ]. Other devices include neurocages for in vitro neural network study [ 26 , 27 , 28 ], bellows for drug delivery [ 29 , 30 , 31 ], an electrochemical patency sensor [ 32 ], microfluidic devices [ 7 ] and electrothermal valves [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Techniques and Considerations in the Microfabrication of Parylene C Microelectromechanical Systems

et al. 2018

Self Cite

View full text Add to dashboard Cite

Parylene C is a promising material for constructing flexible, biocompatible and corrosion-resistant microelectromechanical systems (MEMS) devices. Historically, Parylene C has been employed as an encapsulation material for medical implants, such as stents and pacemakers, due to its strong barrier properties and biocompatibility. In the past few decades, the adaptation of planar microfabrication processes to thin film Parylene C has encouraged its use as an insulator, structural and substrate material for MEMS and other microelectronic devices. However, Parylene C presents unique challenges during microfabrication and during use with liquids, especially for flexible, thin film electronic devices. In particular, the flexibility and low thermal budget of Parylene C require modification of the fabrication techniques inherited from silicon MEMS, and poor adhesion at Parylene-Parylene and Parylene-metal interfaces causes device failure under prolonged use in wet environments. Here, we discuss in detail the promises and challenges inherent to Parylene C and present our experience in developing thin-film Parylene MEMS devices.

show abstract

An Electrochemical Impedance-Based Thermal Flow Sensor for Physiological Fluids

Cited by 35 publications

References 33 publications

Characterization and structure-property relationships of an injectable thiol-Michael addition hydrogel toward compatibility with glioblastoma therapy

Characterization and structure-property relationships of an injectable thiol-Michael addition hydrogel toward compatibility with glioblastoma therapy

A Flexible, Microfabricated Impedimetric Fluid Temperature Sensor

Techniques and Considerations in the Microfabrication of Parylene C Microelectromechanical Systems

Contact Info

Product

Resources

About