Ms. Marina G. Wong Profile

Marina G. Wong

at California Polytechnic State Univ San Luis Obispo

SPIE Involvement:

Author

Publications (2)

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 | 9 May 2024 Presentation + Paper

Electromechanical characterization and computational analysis of the corona-enabled electrostatic printed flexible strain sensors

Logan Schmid, Keala Sunada, Marina Wong, Long Wang

Proceedings Volume 12947, 1294709 (2024) https://doi.org/10.1117/12.3010504

KEYWORDS: Sensors, Fabrication, Finite element methods, Printing, Resistance, Manufacturing, Flexible circuits

Read Abstract +

Printed flexible electronics have received extensive attention due to their significant potential for advancing wearable technologies, such as for monitoring human physiological health and biomechanics. However, current manufacturing techniques (e.g., inkjet printing and screen printing) of these electronics are typically limited by high cost, lengthy fabrication times, and types of print materials. Thus, this study investigates a novel manufacturing technique, namely corona-enabled electrostatic printing (CEP), which leverages high voltage discharged in the air to attract feedstock material particles onto substrates. The CEP technique can potentially fabricate various functional materials in milliseconds, forming binder-free microstructures. This study focuses on optimizing the CEP technique to produce high-performance, flexible, piezoresistive strain sensors. Here, the strain sensors will be fabricated with carbon nanotubes (CNTs) using different discharge voltages. The effect of the discharge voltage (i.e., a critical fabrication parameter) on the sensing performance will be characterized via electromechanical testing. In addition, to better understand the sensing mechanism of the samples, finite element analysis will be performed to investigate the electromechanical response of the CEP-fabricated binder-free CNT networks. Here, computational material models will be established based on microstructures of the CNT networks, which will be acquired from experimental microscopic imaging. Overall, this study will fundamentally advance the CEP manufacturing process for flexible electronics.

Proceedings Article | 18 April 2023 Presentation + Paper

Responsive and sensing composites for impact mitigation and damage detection in soft body armors

Oliver Parker, Nancy Huang, Marina Wong, Long Wang

Proceedings Volume 12484, 124840H (2023) https://doi.org/10.1117/12.2658566

KEYWORDS: Composites, Resistance, Polymers, Fabrication, Materials properties, Polydimethylsiloxane, Electrical conductivity, Manufacturing, FT-IR spectroscopy, Absorption

Read Abstract +

Soft body armors, utilized to mitigate impact damage for the users, are typically composed of layered composites of high strength and toughness woven Kevlar fabrics. Recently, extensive attempts have been made to improve the impact mitigation performance of Kevlar body armor through the incorporation of stimulus-responsive smart materials. For instance, shear thickening or dilatant compounds have been used due to their viscosity changes in response to loading rate. One of the common shear thickening materials is polyborodimethylsiloxane (PBDMS). PBDMS polymer chains possess dynamic cross-links that can break and reform depending on the loading rate, transforming the material from a highly viscous gel to a rigid solid. In addition, nanomaterials have been demonstrated to be capable of effectively enhancing the mechanical properties of polymers and enabling sensing mechanical damages based on strain measurements. Therefore, to further enhance the impact protection performance of body armors, this work aims to develop a responsive and flexible composite with force sensing capabilities by incorporating CNTs and PBDMS with Kevlar fabrics. In particular, additive manufacturing procedures for fabricating the composite material system were developed. A series of mechanical experiments, including quasi-static and dynamic tests, have been conducted to characterize the mechanical performance of the PBDMS-coated Kevlar. In addition, the sensing performance of the CNT/PBDMS-Kevlar composites was evaluated via electromechanical tests. Overall, the PBDMS material system synthesized in this project exhibited dynamic crosslink-based shear stiffening behavior and can effectively reinforce the mechanical performance of Kevlar fabrics, especially under dynamic impact loads. In addition, CNTs and PBDMS were uniformly incorporated with the Kevlar fabrics, which demonstrated a promising approach to detect potential damage on soft body armors.

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