Mr. Harsh Deswal Profile

Harsh Deswal

at Indian Institute of Technology Bombay

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 13 March 2024 Presentation + Paper

Modeling the coulometric data for on-chip flow rate detection as a first order decay problem in a microfluidic device

Harsh Deswal, Ullas Pandey, Shiv Govind Singh, Amit Agrawal

Proceedings Volume 12837, 1283702 (2024) https://doi.org/10.1117/12.3000467

KEYWORDS: Microfluidics, Electrodes, Sensors, Polydimethylsiloxane, Fabrication, Silicon, Plasma, Semiconducting wafers, Ions, Electrolytes

Read Abstract +

On-chip detection of flow rates in microfluidics is critical to lab-on-chip technology. Thermal sensing techniques although widely used are limited by temperature rise of the fluid and issues involving integration inside a microchannel. Electrochemical methods present a reliable alternative. Among the widely used electrochemical techniques, Coulometry measures the charge consumed in a redox reaction at electrode surface. In present work, constant potential coulometry at 2V was performed using an electrochemical workstation on Titanium-Platinum microelectrodes (micropatterned on Si wafer substrate) submerged in a moving 0.1 M NaCl electrolyte solution. The sensing platform consists of Si wafer plasma bonded to a PDMS (poly-dimethyl siloxane) microchannel on top of the electrodes. For a constant applied voltage, the rate of decay of current with time is observed to be a function of the flow rate (flux of ions per unit time). As the flow rate increased, the ions available at the electrode surface increased per unit time leading to slower decay rates. The model equation for current-time curve was obtained as I = αe-(t/τ); where α = 0.0002 ± (1% of 0.0002) and τ = 0.312 to 0.797 for electrolyte (0.1 M NaCl) flow rates ranging from 0 to 200 μL/min. The sensitivity and 3σ resolution of the flow sensor are 0.10 sec/(μL/min)/mm2 and 3.64 μL/min respectively. This work models the coulometric current-time curve as a first order decay problem.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years