Liwei Lin (Advisor)

Research Advised by Professor Liwei Lin

Lin Group:  List of Projects | List of Researchers

Flexible Supercapacitors Based on Micro/Nanofibers

Caiwei Shen
Liwei Lin
Bryan McCloskey
Van Carey
2018
Flexible energy storage components are indispensable in the field of flexible electronicsSupercapacitors featuring high power density, fast charge/discharge rate, long cycle life, and safe operation are desirable devicesMicro/nanofiberbased electrode materials, fabrication processes, and device configurations are investigated towards flexible supercapacitors applications....

Electromagnetic Energy Harvester for Sensors on Overhead Power Distribution Lines

Zhiwei Wu
Liwei Lin
Richard M. White
Dennis Lieu
2020

The electric grid began its service over 100 years ago and accumulated many safety concerns regarding its infrastructure and nearby environment. The wireless sensor network has been deployed to monitor the condition of both the grid infrastructure and environment, and non-interrupted power sources with minimal maintenance has been an engineering challenge. Here, design of an inexpensive and durable electromagnetic energy harvester coupled with the magnetic field from the power line conductors for powering the wireless...

Evaporation-Driven Fast Crystallization of 3D Micro- and Nano-particle Assemblies via Micro Mechanical Systems

Sun Choi
Albert P. Pisano
Tarek I. Zohdi
Liwei Lin
Ming C. Wu
2012
Fast crystallization of solid-phase materials in liquid medium is a crucial prerequisite to achieve the aims of a number of applications for micro-, nanomanufacturing, bio-chemical sensing technology and fundamental colloidal scienceCorresponding mechanical systems for those applications are required to accommodate and take advantage of the virtue of multi-phase (liquid, gas, and solid phases) flow phenomenon to accomplish “crystallization...

Direct-Write Piezoelectric Nanogenerator by Near-Field Electrospinning

Chieh Chang
Liwei Lin
Albert P. Pisano
Seung-Wuk Lee
2009

Electrospinning technology based on the electrostatic driving mechanism can construct long and continuous polymeric nanofibers with diameters less than 100 nm. However, conventional electrospinning process is chaotic by nature. The chaos is manifested in the difficulty to control the deposition position and amount of electrospun nanofibers. In this dissertation, a near-field electrospinning (NFES) process has been developed to deposit solid...

Chip-scale Lidar

Behnam Behroozpour Baghmisheh
Bernhard E. Boser
Ming C. Wu
Liwei Lin
2017

The superiority of lidar compared to radiofrequency and ultrasonic solutions in terms of depth and lateral resolution has been known for decades. In recent years, both application pull such as 3D vision for robotics, rapid prototyping, selfdriving cars, and medical diagnostics, as well as technology developments such as integrated optics and tunable lasers have resulted in new activities

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Carbon Nanotube-based MEMS Energy Storage Devices

Yingqi Jiang
Liwei Lin
Albert P. Pisano
Constance Chang-Hasnain
2011
Carbon nanotube (CNT) forests have been utilized as electrodes in supercapacitors in this work for energy storage applications. High surface area to volume ratio, good electrical conductivity, and low contact resistance to a bottom metal electrode make CNT forests attractive as electrodes in supercapacitors. Several approaches have been investigated to improve the performances such as configurations, power and energy density of CNT-based supercapacitors, including the single layer architecture by utilizing...

A Multi-Stage Micro-Tangential Flow Filtration System for BioMEMS Applications

Patrick Pak-Ho Leung
Dorian Liepmann
Luke P. Lee
Liwei Lin
2002

The micromachining technology that emerged in the 1980s has yielded an explosion of developments of micro electromeclianica1 systems (MEMS) in the past two decades. The developments have brought lives to many miniaturized sensors and...

A MEMS Thin Film AlN Supercritical Carbon Dioxide Valve

Ya-Mei Chen
Albert P. Pisano
Liwei Lin
Tsu-Jae King Liu
Tarek Zohdi
2011
In this thesis, a new piezoelectric valve system with bi-chevron aluminum nitride (AlN) actuator is described. The intended application of the new piezoelectric valve is for the advanced printing technology with supercritical carbon dioxide as the solvent. With supercritical carbon dioxide as the solvent, the ink dissolved will start to nucleate with a micronozzle and generate extremely small and uniform ink particles due to rapid expansion of supercritical...

Selective Encapsulations of MEMS: Micro Channels, Needles, Resonators and Electromechanical Filters

Liwei Lin
Albert P. Pisano
Roger T. Howe
Van P. Carey
1993
Surface and combined surface/bulk micromachining techniques are developed for selectively encapsulated micro devices including micro flow channels, micro hypodermic needles, hermetically sealed lateral micro resonators and electromechanical filters. As part of...

Water-Powered Microfluidic Devices for Diagnostic and Drug Delivery Systems

Yu-Chuan Su
Liwei Lin
Albert P. Pisano
Luke P. Lee
2003
This dissertation presents the development of water-powered microfluidic devices, including actuators, pumps, pressure-sensitive valves, and flow discretizers, by integrating osmosis, capillarity, microfabrication, and polymer processing technologies at the microscale. By harvesting and coordinating the mechanical actuations driven by chemical potentials and interfacial forces, these water-powered devices can transport flows in pre-...