Liwei Lin (Advisor)

Research Advised by Professor Liwei Lin

Lin Group:  List of Projects | List of Researchers

BPN840: W-Band Additive Vacuum Electronics

Ilbey Karakurt
2018

Radio frequency (RF) devices for high frequency applications such as satellite communication and mobile and ground uplinks have brought about the demand for higher power handling capabilities and increased efficiency in these devices. Technologies for creating low cost, advanced millimeter wave electronics devices without sacrificing quality or performance has thus grown. Direct metal additive manufacturing techniques, such as electron beam melting, has been projected to be capable of fabricating such devices. Key concerns regarding these techniques are the requirements for high...

BPN893: 3D Printed Microfluidic Devices for Circulating Tumor Cells (CTCs) Isolation

Juhong Chen
2018

Isolation of circulating tumor cells (CTCs) from blood samples has important prognostic and therapeutic implications for cancer treatments but the process is very challenging due to the low concentration of CTCs. In this study, we report a novel 3D printed microfluidic device functionalized with anti-EpCAM (epithelial cell adhesion molecule) antibodies to isolate CTCs from human blood samples. A multi-jet 3D printing technology is utilized with specially designed interior structures to enabe high surface area and fluid flow manipulation to increase the capture efficiency of tumor...

BPN892: Wearable Muscle Diagnostic System for Sports Monitoring Based On pMUT Arrays

Hong Ding
Yue Liang
2018

Muscle disorders, such as hematoma and atrophy, are major medical concerns stemming from the results of heavy muscles works such as intensive manual labors and physical exercises. For example, about 30% of sports injuries are related to muscles and it has been challenging to monitor the muscles usages and conditions with real-time feedback to avoid the extensive usages of muscles. From the perspective of availability, cost, and simplicity, ultrasonic imaging is a better route than technologies such as computed tomography (CT) and magnetic resonance imaging (MRI) for muscle disorder...

BPN846: 3D Printed Biomedical and Diagnostic Systems

Eric C. Sweet
Nathaniel Liu
Reed Vickerman
2019

This work presents a novel handheld, manually-actuated microfluidic prototype designed for on-site colorimetric detection of infectious pathogens in drinking water. We have also developed a custom drop-casting protocol we use to pre-load the entirely 3D printed device, fabricated via ultra-high resolution additive manufacturing technology, with colorimetric enzymatic reagents and bacteria-specific nutrients, which we use to experimentally detect Escherichia coli (E. coli) bacteria in model drinking water, as well as to determine a limit of detection of 1e6 cfu/mL of E. coli in 6...

BPN774: Applications of 3D Printed Integrated Microfluidic Circuitry, Finger-Powered Pumps, and Mixers

Eric Sweet
Jacqueline Elwood
2019

In this ongoing project we have previously developed a new class of three-dimensional modular fluidic operators (i.e. fluidic diodes, capacitors and transistors); passive 3D internally- rifled mixers; and have previously demonstrated low- cost one-way pumping and mixing systems powered solely by the operator’s finger. In this semesters presentation we feature a 3D printed micromixer-integrated microfluidic gradient generator for antibiotic screening. Every year, more than twenty thousand people in the United States die from antibiotic- resistant bacterial infections. Despite...

BPN782: Flexible Load-Bearing Energy Storage Fabrics

Renxiao Xu
Yuanyuan Huang
2019

The power source is a bottleneck for the successful development of flexible electronics. Instead of using rigid and bulky batteries, flexible multifunctional devices that store energy and bear loads at the same time provide better solutions by working as powering structural components. Here we demonstrate the woven supercapacitor fabrics featuring high flexibility comparable to that of wearable textiles, high tensile strength of over...

BPN860: Laser Printed Carbide-Graphene for Paper Electronics

Yu Long
Minsong Wei
Renxiao Xu
Junwen Zhong
Peisheng He
Fanping Sui
2019

Paper electronics have attracted researchers’ attention in recent years for its potential advantage of disposability, foldability, low density and low cost. In our previous studies, we have shown a drastically different approach by a direct-write laser patterning process on paper to realize various basic device applications, such as a foldable triboelectricity generator and a folded supercapacitor as the potential paper-based power source for paper electronics, a wireless...

BPN772: Graphene for Room Temperature Gas Sensors

Takeshi Hayasaka
Zhichun Shao
Vijay Kumar
Ritu Malik
2019

As air pollution from industrial and automobile emissions becomes more and more severe, a personalized, integrated, gas sensor is desirable for everyone to monitor everyday air quality, as well as their personal health condition noninvasively. Such sensors should have desirable features like energy efficiency, miniature size, accurate response (down to ppm level), and selectivity. Traditional bulk MOX-based gas sensors work in the temperature range of 300C to 400C,...

Textile Supercapacitor for Wearable Energy Storage

Dongwoo Shin
Liwei Lin
Samuel Mao
2018
In today’s world, portable electronics are an integral part of our lives. For example, with a mobile phone, we wake up in the morning, read the news, communicate, send and receive emails, listen to music, diagnose health issues and capture important fleeting moments in photos and videos. We no longer carry heavy stacks of documents and books but hold on to our laptop and wear an electronic watch not merely to know the time, but to monitor and record our health in real-...

Toward A Levitated Micromechanical Resonator

Ilya Gurin
Clark T.-C. Nguyen
Liwei Lin
2010

Capacitive micromechanical (MEMS) resonators promise to dramatically improve the design of RF front-ends for wireless communications by virtue of their high quality factor (Q). Unfortunately, the physical limitations of MEMS resonators’ Q are poorly understood, and the highest Qs have proven difficult to achieve reliably. In order to...